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1. www.timeanddate.com › calendar › autumnal-equinoxWhen Is the First Day of Fall 2024 and 2025? - timeanddate.com

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   September equinox to December solstice: 89.8 days; December solstice to March equinox: 89.0 days; Fall or Autumn? Both fall and autumn are correct English terms for the season preceding winter. Autumn is primarily used in British English, while fall is a term more frequently used in American English. Topics: Astronomy, Seasons, September, March ...

2. www.britannica.com › science › autumnal-equinoxAutumnal equinox | Definition, Dates, & Facts | Britannica

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   Aug 23, 2024 · autumnal equinox, two moments in the year when the Sun is exactly above the Equator and day and night are of equal length; also, either of the two points in the sky where the ecliptic (the Sun’s annual pathway) and the celestial equator intersect. In the Northern Hemisphere the autumnal equinox falls about September 22 or 23, as the Sun ...

   • Author: The Editors of Encyclopaedia Britannica

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4. www.almanac.com › first-day-fall-autumnal-equinoxWhen is the First Day of Fall? Autumnal Equinox 2024

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   Sep 23, 2024 · The fall equinox and the first day of autumn arrives on Sunday, September 22, 2024, at 08:44 A.M. EDT in the Northern Hemisphere. The equinox occurs at the same moment worldwide.

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5. www.history.com › fall-equinoxFall Equinox 2024 ‑ Date, Rituals & Meaning | HISTORY

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   Sep 18, 2017 · When Is the 2024 Fall Equinox? The 2024 fall equinox—also called the autumn equinox—takes place on Sunday, September 22, 2024. The fall equinox is not on the same day each year, though it ...

6. earthsky.org › astronomy-essentials › everything-you2024 September equinox: All you need to know - EarthSky

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   Sep 22, 2024 · The 2024 September equinox will fall at 12:44 UTC (7:44 a.m. CDT) on September 22, 2024. On this day, days and nights are approximately (but not exactly) equal in length for everyone across the ...

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7. www.timeanddate.com › calendar › september-equinoxSeptember Equinox: When and What Is It? - timeanddate.com

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   The September equinox is the moment the Sun crosses the celestial equator —an imaginary line in the sky above Earth’s equator — from north to south. This happens on September 22, 23, or 24 in most years. 10 facts about the September equinox.

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   When is the autumnal equinox?

   • The autumnal equinox is an astronomical event that marks the start of autumn (or “fall”). In the Northern Hemisphere, the autumnal equinox occurs in September; in the Southern Hemisphere, it occurs in March. What Is an Equinox?

   When is the First Day of Fall? Autumnal Equinox 2024

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   What is September equinox?

   • We celebrate the September equinox as the first day of autumn for the Northern Hemisphere, and first day of spring for the Southern Hemisphere. What is it? It’s a milestone in Earth’s orbit around the sun. At an equinox, the sun appears directly above Earth’s equator. At the September equinox, it’s crossing from north to south. When is it?

   EarthSky | 2024 September equinox: All you need to know

   earthsky.org/astronomy-essentials/everything-you-need-to-know-september-equinox/

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   What is the equinox in the southern hemisphere?

   • For those in the Northern Hemisphere, when the Sun crosses the equator going from north to south, this marks the autumnal equinox; when it crosses from south to north, this marks the vernal equinox. In the Southern Hemisphere, it’s the reverse.

   When is the First Day of Fall? Autumnal Equinox 2024

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   Does the autumnal equinox mark the first day of fall?

   • A: Based on the astronomical definition of seasons, yes, the autumnal equinox does mark the first day of fall. Astronomical seasons are based on the Sun’s position in the sky.

   When is the First Day of Fall? Autumnal Equinox 2024

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   Is the fall equinox the same day every year?

   • The fall equinox is not on the same day each year, though it always falls between September 21 and September 24. Equinox comes from the Latin words “aequi,” which means equal, and “nox,” or night. On the equinox, day and night are of nearly equal length across the planet. As the Earth orbits the sun, it is tilted at a fixed angle.

   Fall Equinox 2024 ‑ Date, Rituals & Meaning - HISTORY

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   When do equinoxes fall?

   • The equinoxes fall midway between the solstices. And, indeed, Earth’s two hemispheres receive the sun’s rays about equally around equinox time. But Earth never stops moving in orbit around the sun. And these days of approximately equal daylight and night will change quickly, as we move toward the December solstice.

   EarthSky | 2024 September equinox: All you need to know

   earthsky.org/astronomy-essentials/everything-you-need-to-know-september-equinox/

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9. en.wikipedia.org › wiki › September_equinoxSeptember equinox - Wikipedia

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   The September equinox is when the Sun crosses the celestial equator southward, marking the end of astronomical summer and the beginning of autumn in the Northern Hemisphere. Learn about the dates, times, constellations, and cultural celebrations of this event.