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ABC NewsLiveVideoShowsShopInterest Successfully AddedWe'll notify you here with news aboutTurn on desktop notifications for breaking stories about interest? OffOnStream onDay and night get equal billing Monday as fall equinox arrives. Here's what to knowDay and night will get equal time for a brief moment as the equinox arrivesByThe Associated PressSeptember 19, 2025, 6:05 AM1:07FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)The Associated PressDay and night will get equal time for a brief moment Monday as much of the world heads into fall.The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere and the spring in the Southern Hemisphere. On the equator, the sun will be directly overhead at noon. Equinoxes are the only times when both the north and south poles are lit by sunshine at the same time.In the Northern Hemisphere, sunlight will gradually diminish each day until the winter solstice on Dec. 21.Equinoxes have been marked and celebrated worldwide for centuries. The fall equinox is often connected with harvest festivals in the Northern Hemisphere. For example, Dozynki, the harvest festival celebrated in Poland and other Eastern European countries, was thought to have been originally tied to the equinox. At the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern that resembles a serpent descending a building called El Castillo. This year, there’s a bonus for some: Antarctica, New Zealand and a sliver of Australia may be able to see a partial lunar eclipse during their Monday.But what is happening in the heavens? Here’s what to know about how we split up the year using the Earth’s orbit.As the Earth travels around the sun, it does so at an angle.For most of the year, the Earth’s axis is tilted either toward or away from the sun. That means the sun’s warmth and light fall unequally on the northern and southern halves of the planet.During the equinox, the Earth’s axis and its orbit align so that both hemispheres get an equal amount of sunlight.The word equinox comes from two Latin words, meaning equal and night. That’s because on the equinox, day and night last almost the same amount of time — though one may get a few extra minutes, depending on where you are on the planet.The Northern Hemisphere’s fall — or autumnal — equinox can land between Sept. 21 and 24, depending on the year. Its spring — or vernal — equinox can land between March 19 and 21.Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMThe solstices mark the times during the year when the Earth is at its most extreme tilt toward or away from the sun. This means the hemispheres are getting very different amounts of sunlight — and days and nights are at their most unequal.During the Northern Hemisphere’s summer solstice, the upper half of the Earth is tilted in toward the sun, creating the longest day and shortest night of the year. This solstice falls between June 20 and 22.Meanwhile, at the winter solstice, the Northern Hemisphere is leaning away from the sun — leading to the shortest day and longest night of the year. The winter solstice falls between Dec. 20 and 23.These are just two different ways to carve up the year.While astronomical seasons depend on how the Earth moves around the sun, meteorological seasons are defined by the weather. Meteorologists break down the year into three-month seasons based on annual temperature cycles. By that calendar, spring starts on March 1, summer on June 1, fall on Sept. 1 and winter on Dec. 1.___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.Sponsored Content by TaboolaPopular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMTrump admin live updates: Trump talks with Xi about trade, TikTok dealSep 19, 3:21 PMABC News Live24/7 coverage of breaking news and live eventsABC News NetworkPrivacy PolicyYour US State Privacy RightsChildren's Online Privacy PolicyInterest-Based AdsAbout Nielsen MeasurementTerms of UseDo Not Sell or Share My Personal InformationContact Us © 2025 ABC News

ABC NewsLiveVideoShowsShopInterest Successfully AddedWe'll notify you here with news aboutTurn on desktop notifications for breaking stories about interest? OffOnStream onDay and night get equal billing Monday as fall equinox arrives. Here's what to knowDay and night will get equal time for a brief moment as the equinox arrivesByThe Associated PressSeptember 19, 2025, 6:05 AM1:07FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)The Associated PressDay and night will get equal time for a brief moment Monday as much of the world heads into fall.The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere and the spring in the Southern Hemisphere. On the equator, the sun will be directly overhead at noon. Equinoxes are the only times when both the north and south poles are lit by sunshine at the same time.In the Northern Hemisphere, sunlight will gradually diminish each day until the winter solstice on Dec. 21.Equinoxes have been marked and celebrated worldwide for centuries. The fall equinox is often connected with harvest festivals in the Northern Hemisphere. For example, Dozynki, the harvest festival celebrated in Poland and other Eastern European countries, was thought to have been originally tied to the equinox. At the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern that resembles a serpent descending a building called El Castillo. This year, there’s a bonus for some: Antarctica, New Zealand and a sliver of Australia may be able to see a partial lunar eclipse during their Monday.But what is happening in the heavens? Here’s what to know about how we split up the year using the Earth’s orbit.As the Earth travels around the sun, it does so at an angle.For most of the year, the Earth’s axis is tilted either toward or away from the sun. That means the sun’s warmth and light fall unequally on the northern and southern halves of the planet.During the equinox, the Earth’s axis and its orbit align so that both hemispheres get an equal amount of sunlight.The word equinox comes from two Latin words, meaning equal and night. That’s because on the equinox, day and night last almost the same amount of time — though one may get a few extra minutes, depending on where you are on the planet.The Northern Hemisphere’s fall — or autumnal — equinox can land between Sept. 21 and 24, depending on the year. Its spring — or vernal — equinox can land between March 19 and 21.Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMThe solstices mark the times during the year when the Earth is at its most extreme tilt toward or away from the sun. This means the hemispheres are getting very different amounts of sunlight — and days and nights are at their most unequal.During the Northern Hemisphere’s summer solstice, the upper half of the Earth is tilted in toward the sun, creating the longest day and shortest night of the year. This solstice falls between June 20 and 22.Meanwhile, at the winter solstice, the Northern Hemisphere is leaning away from the sun — leading to the shortest day and longest night of the year. The winter solstice falls between Dec. 20 and 23.These are just two different ways to carve up the year.While astronomical seasons depend on how the Earth moves around the sun, meteorological seasons are defined by the weather. Meteorologists break down the year into three-month seasons based on annual temperature cycles. By that calendar, spring starts on March 1, summer on June 1, fall on Sept. 1 and winter on Dec. 1.___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.Sponsored Content by TaboolaPopular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMTrump admin live updates: Trump talks with Xi about trade, TikTok dealSep 19, 3:21 PMABC News Live24/7 coverage of breaking news and live eventsABC News NetworkPrivacy PolicyYour US State Privacy RightsChildren's Online Privacy PolicyInterest-Based AdsAbout Nielsen MeasurementTerms of UseDo Not Sell or Share My Personal InformationContact Us © 2025 ABC News

ABC NewsLiveVideoShowsShopInterest Successfully AddedWe'll notify you here with news aboutTurn on desktop notifications for breaking stories about interest? OffOnStream onDay and night get equal billing Monday as fall equinox arrives. Here's what to knowDay and night will get equal time for a brief moment as the equinox arrivesByThe Associated PressSeptember 19, 2025, 6:05 AM1:07FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)The Associated PressDay and night will get equal time for a brief moment Monday as much of the world heads into fall.The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere and the spring in the Southern Hemisphere. On the equator, the sun will be directly overhead at noon. Equinoxes are the only times when both the north and south poles are lit by sunshine at the same time.In the Northern Hemisphere, sunlight will gradually diminish each day until the winter solstice on Dec. 21.Equinoxes have been marked and celebrated worldwide for centuries. The fall equinox is often connected with harvest festivals in the Northern Hemisphere. For example, Dozynki, the harvest festival celebrated in Poland and other Eastern European countries, was thought to have been originally tied to the equinox. At the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern that resembles a serpent descending a building called El Castillo. This year, there’s a bonus for some: Antarctica, New Zealand and a sliver of Australia may be able to see a partial lunar eclipse during their Monday.But what is happening in the heavens? Here’s what to know about how we split up the year using the Earth’s orbit.As the Earth travels around the sun, it does so at an angle.For most of the year, the Earth’s axis is tilted either toward or away from the sun. That means the sun’s warmth and light fall unequally on the northern and southern halves of the planet.During the equinox, the Earth’s axis and its orbit align so that both hemispheres get an equal amount of sunlight.The word equinox comes from two Latin words, meaning equal and night. That’s because on the equinox, day and night last almost the same amount of time — though one may get a few extra minutes, depending on where you are on the planet.The Northern Hemisphere’s fall — or autumnal — equinox can land between Sept. 21 and 24, depending on the year. Its spring — or vernal — equinox can land between March 19 and 21.Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMThe solstices mark the times during the year when the Earth is at its most extreme tilt toward or away from the sun. This means the hemispheres are getting very different amounts of sunlight — and days and nights are at their most unequal.During the Northern Hemisphere’s summer solstice, the upper half of the Earth is tilted in toward the sun, creating the longest day and shortest night of the year. This solstice falls between June 20 and 22.Meanwhile, at the winter solstice, the Northern Hemisphere is leaning away from the sun — leading to the shortest day and longest night of the year. The winter solstice falls between Dec. 20 and 23.These are just two different ways to carve up the year.While astronomical seasons depend on how the Earth moves around the sun, meteorological seasons are defined by the weather. Meteorologists break down the year into three-month seasons based on annual temperature cycles. By that calendar, spring starts on March 1, summer on June 1, fall on Sept. 1 and winter on Dec. 1.___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.Sponsored Content by TaboolaPopular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMTrump admin live updates: Trump talks with Xi about trade, TikTok dealSep 19, 3:21 PMABC News Live24/7 coverage of breaking news and live eventsABC News NetworkPrivacy PolicyYour US State Privacy RightsChildren's Online Privacy PolicyInterest-Based AdsAbout Nielsen MeasurementTerms of UseDo Not Sell or Share My Personal InformationContact Us © 2025 ABC News

ABC NewsLiveVideoShowsShopInterest Successfully AddedWe'll notify you here with news aboutTurn on desktop notifications for breaking stories about interest? OffOnStream onDay and night get equal billing Monday as fall equinox arrives. Here's what to knowDay and night will get equal time for a brief moment as the equinox arrivesByThe Associated PressSeptember 19, 2025, 6:05 AM1:07FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)The Associated PressDay and night will get equal time for a brief moment Monday as much of the world heads into fall.The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere and the spring in the Southern Hemisphere. On the equator, the sun will be directly overhead at noon. Equinoxes are the only times when both the north and south poles are lit by sunshine at the same time.In the Northern Hemisphere, sunlight will gradually diminish each day until the winter solstice on Dec. 21.Equinoxes have been marked and celebrated worldwide for centuries. The fall equinox is often connected with harvest festivals in the Northern Hemisphere. For example, Dozynki, the harvest festival celebrated in Poland and other Eastern European countries, was thought to have been originally tied to the equinox. At the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern that resembles a serpent descending a building called El Castillo. This year, there’s a bonus for some: Antarctica, New Zealand and a sliver of Australia may be able to see a partial lunar eclipse during their Monday.But what is happening in the heavens? Here’s what to know about how we split up the year using the Earth’s orbit.As the Earth travels around the sun, it does so at an angle.For most of the year, the Earth’s axis is tilted either toward or away from the sun. That means the sun’s warmth and light fall unequally on the northern and southern halves of the planet.During the equinox, the Earth’s axis and its orbit align so that both hemispheres get an equal amount of sunlight.The word equinox comes from two Latin words, meaning equal and night. That’s because on the equinox, day and night last almost the same amount of time — though one may get a few extra minutes, depending on where you are on the planet.The Northern Hemisphere’s fall — or autumnal — equinox can land between Sept. 21 and 24, depending on the year. Its spring — or vernal — equinox can land between March 19 and 21.Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMThe solstices mark the times during the year when the Earth is at its most extreme tilt toward or away from the sun. This means the hemispheres are getting very different amounts of sunlight — and days and nights are at their most unequal.During the Northern Hemisphere’s summer solstice, the upper half of the Earth is tilted in toward the sun, creating the longest day and shortest night of the year. This solstice falls between June 20 and 22.Meanwhile, at the winter solstice, the Northern Hemisphere is leaning away from the sun — leading to the shortest day and longest night of the year. The winter solstice falls between Dec. 20 and 23.These are just two different ways to carve up the year.While astronomical seasons depend on how the Earth moves around the sun, meteorological seasons are defined by the weather. Meteorologists break down the year into three-month seasons based on annual temperature cycles. By that calendar, spring starts on March 1, summer on June 1, fall on Sept. 1 and winter on Dec. 1.___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.Sponsored Content by TaboolaPopular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMTrump admin live updates: Trump talks with Xi about trade, TikTok dealSep 19, 3:21 PMABC News Live24/7 coverage of breaking news and live eventsABC News NetworkPrivacy PolicyYour US State Privacy RightsChildren's Online Privacy PolicyInterest-Based AdsAbout Nielsen MeasurementTerms of UseDo Not Sell or Share My Personal InformationContact Us © 2025 ABC News

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Day and night get equal billing Monday as fall equinox arrives. Here's what to knowDay and night will get equal time for a brief moment as the equinox arrivesByThe Associated PressSeptember 19, 2025, 6:05 AM1:07FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)The Associated PressDay and night will get equal time for a brief moment Monday as much of the world heads into fall.The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere and the spring in the Southern Hemisphere. On the equator, the sun will be directly overhead at noon. Equinoxes are the only times when both the north and south poles are lit by sunshine at the same time.In the Northern Hemisphere, sunlight will gradually diminish each day until the winter solstice on Dec. 21.Equinoxes have been marked and celebrated worldwide for centuries. The fall equinox is often connected with harvest festivals in the Northern Hemisphere. For example, Dozynki, the harvest festival celebrated in Poland and other Eastern European countries, was thought to have been originally tied to the equinox. At the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern that resembles a serpent descending a building called El Castillo. This year, there’s a bonus for some: Antarctica, New Zealand and a sliver of Australia may be able to see a partial lunar eclipse during their Monday.But what is happening in the heavens? Here’s what to know about how we split up the year using the Earth’s orbit.As the Earth travels around the sun, it does so at an angle.For most of the year, the Earth’s axis is tilted either toward or away from the sun. That means the sun’s warmth and light fall unequally on the northern and southern halves of the planet.During the equinox, the Earth’s axis and its orbit align so that both hemispheres get an equal amount of sunlight.The word equinox comes from two Latin words, meaning equal and night. That’s because on the equinox, day and night last almost the same amount of time — though one may get a few extra minutes, depending on where you are on the planet.The Northern Hemisphere’s fall — or autumnal — equinox can land between Sept. 21 and 24, depending on the year. Its spring — or vernal — equinox can land between March 19 and 21.Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMThe solstices mark the times during the year when the Earth is at its most extreme tilt toward or away from the sun. This means the hemispheres are getting very different amounts of sunlight — and days and nights are at their most unequal.During the Northern Hemisphere’s summer solstice, the upper half of the Earth is tilted in toward the sun, creating the longest day and shortest night of the year. This solstice falls between June 20 and 22.Meanwhile, at the winter solstice, the Northern Hemisphere is leaning away from the sun — leading to the shortest day and longest night of the year. The winter solstice falls between Dec. 20 and 23.These are just two different ways to carve up the year.While astronomical seasons depend on how the Earth moves around the sun, meteorological seasons are defined by the weather. Meteorologists break down the year into three-month seasons based on annual temperature cycles. By that calendar, spring starts on March 1, summer on June 1, fall on Sept. 1 and winter on Dec. 1.___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.Sponsored Content by TaboolaPopular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMTrump admin live updates: Trump talks with Xi about trade, TikTok dealSep 19, 3:21 PMABC News Live24/7 coverage of breaking news and live events

Day and night get equal billing Monday as fall equinox arrives. Here's what to knowDay and night will get equal time for a brief moment as the equinox arrivesByThe Associated PressSeptember 19, 2025, 6:05 AM1:07FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)The Associated PressDay and night will get equal time for a brief moment Monday as much of the world heads into fall.The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere and the spring in the Southern Hemisphere. On the equator, the sun will be directly overhead at noon. Equinoxes are the only times when both the north and south poles are lit by sunshine at the same time.In the Northern Hemisphere, sunlight will gradually diminish each day until the winter solstice on Dec. 21.Equinoxes have been marked and celebrated worldwide for centuries. The fall equinox is often connected with harvest festivals in the Northern Hemisphere. For example, Dozynki, the harvest festival celebrated in Poland and other Eastern European countries, was thought to have been originally tied to the equinox. At the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern that resembles a serpent descending a building called El Castillo. This year, there’s a bonus for some: Antarctica, New Zealand and a sliver of Australia may be able to see a partial lunar eclipse during their Monday.But what is happening in the heavens? Here’s what to know about how we split up the year using the Earth’s orbit.As the Earth travels around the sun, it does so at an angle.For most of the year, the Earth’s axis is tilted either toward or away from the sun. That means the sun’s warmth and light fall unequally on the northern and southern halves of the planet.During the equinox, the Earth’s axis and its orbit align so that both hemispheres get an equal amount of sunlight.The word equinox comes from two Latin words, meaning equal and night. That’s because on the equinox, day and night last almost the same amount of time — though one may get a few extra minutes, depending on where you are on the planet.The Northern Hemisphere’s fall — or autumnal — equinox can land between Sept. 21 and 24, depending on the year. Its spring — or vernal — equinox can land between March 19 and 21.Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMThe solstices mark the times during the year when the Earth is at its most extreme tilt toward or away from the sun. This means the hemispheres are getting very different amounts of sunlight — and days and nights are at their most unequal.During the Northern Hemisphere’s summer solstice, the upper half of the Earth is tilted in toward the sun, creating the longest day and shortest night of the year. This solstice falls between June 20 and 22.Meanwhile, at the winter solstice, the Northern Hemisphere is leaning away from the sun — leading to the shortest day and longest night of the year. The winter solstice falls between Dec. 20 and 23.These are just two different ways to carve up the year.While astronomical seasons depend on how the Earth moves around the sun, meteorological seasons are defined by the weather. Meteorologists break down the year into three-month seasons based on annual temperature cycles. By that calendar, spring starts on March 1, summer on June 1, fall on Sept. 1 and winter on Dec. 1.___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.Sponsored Content by TaboolaPopular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMTrump admin live updates: Trump talks with Xi about trade, TikTok dealSep 19, 3:21 PMABC News Live24/7 coverage of breaking news and live events

Day and night get equal billing Monday as fall equinox arrives. Here's what to knowDay and night will get equal time for a brief moment as the equinox arrivesByThe Associated PressSeptember 19, 2025, 6:05 AM1:07FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)The Associated PressDay and night will get equal time for a brief moment Monday as much of the world heads into fall.The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere and the spring in the Southern Hemisphere. On the equator, the sun will be directly overhead at noon. Equinoxes are the only times when both the north and south poles are lit by sunshine at the same time.In the Northern Hemisphere, sunlight will gradually diminish each day until the winter solstice on Dec. 21.Equinoxes have been marked and celebrated worldwide for centuries. The fall equinox is often connected with harvest festivals in the Northern Hemisphere. For example, Dozynki, the harvest festival celebrated in Poland and other Eastern European countries, was thought to have been originally tied to the equinox. At the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern that resembles a serpent descending a building called El Castillo. This year, there’s a bonus for some: Antarctica, New Zealand and a sliver of Australia may be able to see a partial lunar eclipse during their Monday.But what is happening in the heavens? Here’s what to know about how we split up the year using the Earth’s orbit.As the Earth travels around the sun, it does so at an angle.For most of the year, the Earth’s axis is tilted either toward or away from the sun. That means the sun’s warmth and light fall unequally on the northern and southern halves of the planet.During the equinox, the Earth’s axis and its orbit align so that both hemispheres get an equal amount of sunlight.The word equinox comes from two Latin words, meaning equal and night. That’s because on the equinox, day and night last almost the same amount of time — though one may get a few extra minutes, depending on where you are on the planet.The Northern Hemisphere’s fall — or autumnal — equinox can land between Sept. 21 and 24, depending on the year. Its spring — or vernal — equinox can land between March 19 and 21.Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMThe solstices mark the times during the year when the Earth is at its most extreme tilt toward or away from the sun. This means the hemispheres are getting very different amounts of sunlight — and days and nights are at their most unequal.During the Northern Hemisphere’s summer solstice, the upper half of the Earth is tilted in toward the sun, creating the longest day and shortest night of the year. This solstice falls between June 20 and 22.Meanwhile, at the winter solstice, the Northern Hemisphere is leaning away from the sun — leading to the shortest day and longest night of the year. The winter solstice falls between Dec. 20 and 23.These are just two different ways to carve up the year.While astronomical seasons depend on how the Earth moves around the sun, meteorological seasons are defined by the weather. Meteorologists break down the year into three-month seasons based on annual temperature cycles. By that calendar, spring starts on March 1, summer on June 1, fall on Sept. 1 and winter on Dec. 1.___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.Sponsored Content by TaboolaPopular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMTrump admin live updates: Trump talks with Xi about trade, TikTok dealSep 19, 3:21 PMABC News Live24/7 coverage of breaking news and live events

Day and night get equal billing Monday as fall equinox arrives. Here's what to knowDay and night will get equal time for a brief moment as the equinox arrivesByThe Associated PressSeptember 19, 2025, 6:05 AM1:07FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)The Associated PressDay and night will get equal time for a brief moment Monday as much of the world heads into fall.The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere and the spring in the Southern Hemisphere. On the equator, the sun will be directly overhead at noon. Equinoxes are the only times when both the north and south poles are lit by sunshine at the same time.In the Northern Hemisphere, sunlight will gradually diminish each day until the winter solstice on Dec. 21.Equinoxes have been marked and celebrated worldwide for centuries. The fall equinox is often connected with harvest festivals in the Northern Hemisphere. For example, Dozynki, the harvest festival celebrated in Poland and other Eastern European countries, was thought to have been originally tied to the equinox. At the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern that resembles a serpent descending a building called El Castillo. This year, there’s a bonus for some: Antarctica, New Zealand and a sliver of Australia may be able to see a partial lunar eclipse during their Monday.But what is happening in the heavens? Here’s what to know about how we split up the year using the Earth’s orbit.As the Earth travels around the sun, it does so at an angle.For most of the year, the Earth’s axis is tilted either toward or away from the sun. That means the sun’s warmth and light fall unequally on the northern and southern halves of the planet.During the equinox, the Earth’s axis and its orbit align so that both hemispheres get an equal amount of sunlight.The word equinox comes from two Latin words, meaning equal and night. That’s because on the equinox, day and night last almost the same amount of time — though one may get a few extra minutes, depending on where you are on the planet.The Northern Hemisphere’s fall — or autumnal — equinox can land between Sept. 21 and 24, depending on the year. Its spring — or vernal — equinox can land between March 19 and 21.Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMThe solstices mark the times during the year when the Earth is at its most extreme tilt toward or away from the sun. This means the hemispheres are getting very different amounts of sunlight — and days and nights are at their most unequal.During the Northern Hemisphere’s summer solstice, the upper half of the Earth is tilted in toward the sun, creating the longest day and shortest night of the year. This solstice falls between June 20 and 22.Meanwhile, at the winter solstice, the Northern Hemisphere is leaning away from the sun — leading to the shortest day and longest night of the year. The winter solstice falls between Dec. 20 and 23.These are just two different ways to carve up the year.While astronomical seasons depend on how the Earth moves around the sun, meteorological seasons are defined by the weather. Meteorologists break down the year into three-month seasons based on annual temperature cycles. By that calendar, spring starts on March 1, summer on June 1, fall on Sept. 1 and winter on Dec. 1.___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.Sponsored Content by TaboolaPopular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMTrump admin live updates: Trump talks with Xi about trade, TikTok dealSep 19, 3:21 PMABC News Live24/7 coverage of breaking news and live events

Day and night get equal billing Monday as fall equinox arrives. Here's what to knowDay and night will get equal time for a brief moment as the equinox arrivesByThe Associated PressSeptember 19, 2025, 6:05 AM1:07FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)The Associated PressDay and night will get equal time for a brief moment Monday as much of the world heads into fall.The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere and the spring in the Southern Hemisphere. On the equator, the sun will be directly overhead at noon. Equinoxes are the only times when both the north and south poles are lit by sunshine at the same time.In the Northern Hemisphere, sunlight will gradually diminish each day until the winter solstice on Dec. 21.Equinoxes have been marked and celebrated worldwide for centuries. The fall equinox is often connected with harvest festivals in the Northern Hemisphere. For example, Dozynki, the harvest festival celebrated in Poland and other Eastern European countries, was thought to have been originally tied to the equinox. At the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern that resembles a serpent descending a building called El Castillo. This year, there’s a bonus for some: Antarctica, New Zealand and a sliver of Australia may be able to see a partial lunar eclipse during their Monday.But what is happening in the heavens? Here’s what to know about how we split up the year using the Earth’s orbit.As the Earth travels around the sun, it does so at an angle.For most of the year, the Earth’s axis is tilted either toward or away from the sun. That means the sun’s warmth and light fall unequally on the northern and southern halves of the planet.During the equinox, the Earth’s axis and its orbit align so that both hemispheres get an equal amount of sunlight.The word equinox comes from two Latin words, meaning equal and night. That’s because on the equinox, day and night last almost the same amount of time — though one may get a few extra minutes, depending on where you are on the planet.The Northern Hemisphere’s fall — or autumnal — equinox can land between Sept. 21 and 24, depending on the year. Its spring — or vernal — equinox can land between March 19 and 21.Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMThe solstices mark the times during the year when the Earth is at its most extreme tilt toward or away from the sun. This means the hemispheres are getting very different amounts of sunlight — and days and nights are at their most unequal.During the Northern Hemisphere’s summer solstice, the upper half of the Earth is tilted in toward the sun, creating the longest day and shortest night of the year. This solstice falls between June 20 and 22.Meanwhile, at the winter solstice, the Northern Hemisphere is leaning away from the sun — leading to the shortest day and longest night of the year. The winter solstice falls between Dec. 20 and 23.These are just two different ways to carve up the year.While astronomical seasons depend on how the Earth moves around the sun, meteorological seasons are defined by the weather. Meteorologists break down the year into three-month seasons based on annual temperature cycles. By that calendar, spring starts on March 1, summer on June 1, fall on Sept. 1 and winter on Dec. 1.___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.Sponsored Content by TaboolaPopular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMTrump admin live updates: Trump talks with Xi about trade, TikTok dealSep 19, 3:21 PMABC News Live24/7 coverage of breaking news and live events

Day and night get equal billing Monday as fall equinox arrives. Here's what to knowDay and night will get equal time for a brief moment as the equinox arrivesByThe Associated PressSeptember 19, 2025, 6:05 AM1:07FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)The Associated PressDay and night will get equal time for a brief moment Monday as much of the world heads into fall.The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere and the spring in the Southern Hemisphere. On the equator, the sun will be directly overhead at noon. Equinoxes are the only times when both the north and south poles are lit by sunshine at the same time.In the Northern Hemisphere, sunlight will gradually diminish each day until the winter solstice on Dec. 21.Equinoxes have been marked and celebrated worldwide for centuries. The fall equinox is often connected with harvest festivals in the Northern Hemisphere. For example, Dozynki, the harvest festival celebrated in Poland and other Eastern European countries, was thought to have been originally tied to the equinox. At the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern that resembles a serpent descending a building called El Castillo. This year, there’s a bonus for some: Antarctica, New Zealand and a sliver of Australia may be able to see a partial lunar eclipse during their Monday.But what is happening in the heavens? Here’s what to know about how we split up the year using the Earth’s orbit.As the Earth travels around the sun, it does so at an angle.For most of the year, the Earth’s axis is tilted either toward or away from the sun. That means the sun’s warmth and light fall unequally on the northern and southern halves of the planet.During the equinox, the Earth’s axis and its orbit align so that both hemispheres get an equal amount of sunlight.The word equinox comes from two Latin words, meaning equal and night. That’s because on the equinox, day and night last almost the same amount of time — though one may get a few extra minutes, depending on where you are on the planet.The Northern Hemisphere’s fall — or autumnal — equinox can land between Sept. 21 and 24, depending on the year. Its spring — or vernal — equinox can land between March 19 and 21.Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMThe solstices mark the times during the year when the Earth is at its most extreme tilt toward or away from the sun. This means the hemispheres are getting very different amounts of sunlight — and days and nights are at their most unequal.During the Northern Hemisphere’s summer solstice, the upper half of the Earth is tilted in toward the sun, creating the longest day and shortest night of the year. This solstice falls between June 20 and 22.Meanwhile, at the winter solstice, the Northern Hemisphere is leaning away from the sun — leading to the shortest day and longest night of the year. The winter solstice falls between Dec. 20 and 23.These are just two different ways to carve up the year.While astronomical seasons depend on how the Earth moves around the sun, meteorological seasons are defined by the weather. Meteorologists break down the year into three-month seasons based on annual temperature cycles. By that calendar, spring starts on March 1, summer on June 1, fall on Sept. 1 and winter on Dec. 1.___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.Sponsored Content by Taboola

Day and night get equal billing Monday as fall equinox arrives. Here's what to knowDay and night will get equal time for a brief moment as the equinox arrivesByThe Associated PressSeptember 19, 2025, 6:05 AM1:07FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)The Associated PressDay and night will get equal time for a brief moment Monday as much of the world heads into fall.The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere and the spring in the Southern Hemisphere. On the equator, the sun will be directly overhead at noon. Equinoxes are the only times when both the north and south poles are lit by sunshine at the same time.In the Northern Hemisphere, sunlight will gradually diminish each day until the winter solstice on Dec. 21.Equinoxes have been marked and celebrated worldwide for centuries. The fall equinox is often connected with harvest festivals in the Northern Hemisphere. For example, Dozynki, the harvest festival celebrated in Poland and other Eastern European countries, was thought to have been originally tied to the equinox. At the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern that resembles a serpent descending a building called El Castillo. This year, there’s a bonus for some: Antarctica, New Zealand and a sliver of Australia may be able to see a partial lunar eclipse during their Monday.But what is happening in the heavens? Here’s what to know about how we split up the year using the Earth’s orbit.As the Earth travels around the sun, it does so at an angle.For most of the year, the Earth’s axis is tilted either toward or away from the sun. That means the sun’s warmth and light fall unequally on the northern and southern halves of the planet.During the equinox, the Earth’s axis and its orbit align so that both hemispheres get an equal amount of sunlight.The word equinox comes from two Latin words, meaning equal and night. That’s because on the equinox, day and night last almost the same amount of time — though one may get a few extra minutes, depending on where you are on the planet.The Northern Hemisphere’s fall — or autumnal — equinox can land between Sept. 21 and 24, depending on the year. Its spring — or vernal — equinox can land between March 19 and 21.Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMThe solstices mark the times during the year when the Earth is at its most extreme tilt toward or away from the sun. This means the hemispheres are getting very different amounts of sunlight — and days and nights are at their most unequal.During the Northern Hemisphere’s summer solstice, the upper half of the Earth is tilted in toward the sun, creating the longest day and shortest night of the year. This solstice falls between June 20 and 22.Meanwhile, at the winter solstice, the Northern Hemisphere is leaning away from the sun — leading to the shortest day and longest night of the year. The winter solstice falls between Dec. 20 and 23.These are just two different ways to carve up the year.While astronomical seasons depend on how the Earth moves around the sun, meteorological seasons are defined by the weather. Meteorologists break down the year into three-month seasons based on annual temperature cycles. By that calendar, spring starts on March 1, summer on June 1, fall on Sept. 1 and winter on Dec. 1.___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.Sponsored Content by Taboola

Day and night get equal billing Monday as fall equinox arrives. Here's what to knowDay and night will get equal time for a brief moment as the equinox arrives

Day and night will get equal time for a brief moment as the equinox arrives

1:07FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)The Associated Press

1:07FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)The Associated Press

1:07FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)The Associated Press

1:07FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)The Associated Press

FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)The Associated Press

FILE - A passenger on a canoe photographs the brilliant fall foliage on South Pond, Oct. 9, 2021, in Bryant Point, Maine. (AP Photo/Robert F. Bukaty, File)

Day and night will get equal time for a brief moment Monday as much of the world heads into fall.The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere and the spring in the Southern Hemisphere. On the equator, the sun will be directly overhead at noon. Equinoxes are the only times when both the north and south poles are lit by sunshine at the same time.In the Northern Hemisphere, sunlight will gradually diminish each day until the winter solstice on Dec. 21.Equinoxes have been marked and celebrated worldwide for centuries. The fall equinox is often connected with harvest festivals in the Northern Hemisphere. For example, Dozynki, the harvest festival celebrated in Poland and other Eastern European countries, was thought to have been originally tied to the equinox. At the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern that resembles a serpent descending a building called El Castillo. This year, there’s a bonus for some: Antarctica, New Zealand and a sliver of Australia may be able to see a partial lunar eclipse during their Monday.But what is happening in the heavens? Here’s what to know about how we split up the year using the Earth’s orbit.As the Earth travels around the sun, it does so at an angle.For most of the year, the Earth’s axis is tilted either toward or away from the sun. That means the sun’s warmth and light fall unequally on the northern and southern halves of the planet.During the equinox, the Earth’s axis and its orbit align so that both hemispheres get an equal amount of sunlight.The word equinox comes from two Latin words, meaning equal and night. That’s because on the equinox, day and night last almost the same amount of time — though one may get a few extra minutes, depending on where you are on the planet.The Northern Hemisphere’s fall — or autumnal — equinox can land between Sept. 21 and 24, depending on the year. Its spring — or vernal — equinox can land between March 19 and 21.Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMThe solstices mark the times during the year when the Earth is at its most extreme tilt toward or away from the sun. This means the hemispheres are getting very different amounts of sunlight — and days and nights are at their most unequal.During the Northern Hemisphere’s summer solstice, the upper half of the Earth is tilted in toward the sun, creating the longest day and shortest night of the year. This solstice falls between June 20 and 22.Meanwhile, at the winter solstice, the Northern Hemisphere is leaning away from the sun — leading to the shortest day and longest night of the year. The winter solstice falls between Dec. 20 and 23.These are just two different ways to carve up the year.While astronomical seasons depend on how the Earth moves around the sun, meteorological seasons are defined by the weather. Meteorologists break down the year into three-month seasons based on annual temperature cycles. By that calendar, spring starts on March 1, summer on June 1, fall on Sept. 1 and winter on Dec. 1.___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.

Day and night will get equal time for a brief moment Monday as much of the world heads into fall.

The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere and the spring in the Southern Hemisphere. On the equator, the sun will be directly overhead at noon. Equinoxes are the only times when both the north and south poles are lit by sunshine at the same time.

In the Northern Hemisphere, sunlight will gradually diminish each day until the winter solstice on Dec. 21.

Equinoxes have been marked and celebrated worldwide for centuries. The fall equinox is often connected with harvest festivals in the Northern Hemisphere. For example, Dozynki, the harvest festival celebrated in Poland and other Eastern European countries, was thought to have been originally tied to the equinox. At the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern that resembles a serpent descending a building called El Castillo.

This year, there’s a bonus for some: Antarctica, New Zealand and a sliver of Australia may be able to see a partial lunar eclipse during their Monday.

But what is happening in the heavens? Here’s what to know about how we split up the year using the Earth’s orbit.

As the Earth travels around the sun, it does so at an angle.

For most of the year, the Earth’s axis is tilted either toward or away from the sun. That means the sun’s warmth and light fall unequally on the northern and southern halves of the planet.

During the equinox, the Earth’s axis and its orbit align so that both hemispheres get an equal amount of sunlight.

The word equinox comes from two Latin words, meaning equal and night. That’s because on the equinox, day and night last almost the same amount of time — though one may get a few extra minutes, depending on where you are on the planet.

The Northern Hemisphere’s fall — or autumnal — equinox can land between Sept. 21 and 24, depending on the year. Its spring — or vernal — equinox can land between March 19 and 21.

Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PM

Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PM

Charlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PM

Charlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PM

Charlie Kirk leaves behind wife, 2 kids: What to know

Charlie Kirk leaves behind wife, 2 kids: What to know

Trump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PM

Trump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PM

Trump poised to fire US attorney for resisting effort to charge NY AG: Sources

Trump poised to fire US attorney for resisting effort to charge NY AG: Sources

Video shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PM

Video shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PM

Video shows Charlie Kirk shooting suspect jump down from roof, make getaway

Video shows Charlie Kirk shooting suspect jump down from roof, make getaway

The solstices mark the times during the year when the Earth is at its most extreme tilt toward or away from the sun. This means the hemispheres are getting very different amounts of sunlight — and days and nights are at their most unequal.

During the Northern Hemisphere’s summer solstice, the upper half of the Earth is tilted in toward the sun, creating the longest day and shortest night of the year. This solstice falls between June 20 and 22.

Meanwhile, at the winter solstice, the Northern Hemisphere is leaning away from the sun — leading to the shortest day and longest night of the year. The winter solstice falls between Dec. 20 and 23.

These are just two different ways to carve up the year.

While astronomical seasons depend on how the Earth moves around the sun, meteorological seasons are defined by the weather. Meteorologists break down the year into three-month seasons based on annual temperature cycles. By that calendar, spring starts on March 1, summer on June 1, fall on Sept. 1 and winter on Dec. 1.

The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.

Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMTrump admin live updates: Trump talks with Xi about trade, TikTok dealSep 19, 3:21 PMABC News Live24/7 coverage of breaking news and live events

Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMTrump admin live updates: Trump talks with Xi about trade, TikTok dealSep 19, 3:21 PMABC News Live24/7 coverage of breaking news and live events

Popular ReadsCharlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PMVideo shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PMTrump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PMTrump admin live updates: Trump talks with Xi about trade, TikTok dealSep 19, 3:21 PM

Charlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PM

Charlie Kirk leaves behind wife, 2 kids: What to knowSep 18, 1:07 PM

Charlie Kirk leaves behind wife, 2 kids: What to know

Charlie Kirk leaves behind wife, 2 kids: What to know

Video shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PM

Video shows Charlie Kirk shooting suspect jump down from roof, make getawaySep 11, 10:33 PM

Video shows Charlie Kirk shooting suspect jump down from roof, make getaway

Video shows Charlie Kirk shooting suspect jump down from roof, make getaway

Trump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PM

Trump poised to fire US attorney for resisting effort to charge NY AG: SourcesSep 19, 5:44 PM

Trump poised to fire US attorney for resisting effort to charge NY AG: Sources

Trump poised to fire US attorney for resisting effort to charge NY AG: Sources

Trump admin live updates: Trump talks with Xi about trade, TikTok dealSep 19, 3:21 PM

Trump admin live updates: Trump talks with Xi about trade, TikTok dealSep 19, 3:21 PM

Trump admin live updates: Trump talks with Xi about trade, TikTok deal

Trump admin live updates: Trump talks with Xi about trade, TikTok deal

ABC News Live24/7 coverage of breaking news and live events