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

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   Jun 25, 2024 · The autumnal equinox is when the Sun crosses the celestial equator going south, marking the beginning of autumn in the Northern Hemisphere. It occurs around September 22 or 23 and is related to the precession of Earth's axis and the ecliptic.

   • Author: The Editors of Encyclopaedia Britannica

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   When is the September equinox?

   • In the Southern Hemisphere—that is, anywhere south of Earth’s equator—the September equinox happens in spring. In contrast, it occurs in autumn in the Northern Hemisphere. Understanding an equinox will help you understand why it occurs twice a year and at different times and how it relates to other astronomical events, like solstices.

   What are the Equinoxes and Solstices - Equinox World

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   When is the equinox in the northern hemisphere?

   • In the Northern Hemisphere the autumnal equinox falls about September 22 or 23, as the Sun crosses the celestial equator going south. In the Southern Hemisphere the equinox occurs on March 20 or 21, when the Sun moves north across the celestial equator. What causes the seasons?

   Autumnal equinox | Definition, Dates, & Facts | Britannica

   www.britannica.com/science/autumnal-equinox

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   When do equinoxes occur?

   • The equinoxes occur around March 20 and September 22 each year, corresponding to an equal length of day and night. The Earth tilts on its axis so that the sun shines directly over the equator on these days. The equinoxes, or “equal nights,” happen twice a year: around March 20 and September 21. Equinox comes from Latin, meaning “equal night.”

   Solstices and Equinoxes [Dates and Times] - Equinox World

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   When is the March equinox?

   • The March equinox occurs on March 20 or 21. The term “equinox” comes from Latin roots meaning “equal night.” Spring commences in the Northern Hemisphere when days and nights are roughly equal in length. It’s also known as the vernal (spring) equinox.

   What are the Equinoxes and Solstices - Equinox World

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3. equinoxworld.org › solstices-and-equinoxes-dateSolstices and Equinoxes [Dates and Times] - Equinox World

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   Jun 22, 2024 · The equinoxes, or “equal nights,” happen twice a year: around March 20 and September 21. Equinox comes from Latin, meaning “equal night.” The two equinoxes occur in March and September; the two solstices occur in June and December.

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5. northernlightsshuttertech.com › september-equinoxSeptember Equinox & Northern Light - Northern Lights Shutter Tech

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   Jun 21, 2024 · Discover the magic of the September equinox and how it enhances the Northern Lights experience. Learn why this season is ideal for witnessing the auroras.

6. equinoxworld.org › what-are-the-equinoxes-andWhat are the Equinoxes and Solstices - Equinox World

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   Jun 21, 2024 · The September equinox, also called the autumnal equinox, takes place on September 22nd. The equinox occurs when the sun crosses the celestial equator and marks the point where day and night are equal.

7. www.calendardate.com › autumn_2025When is Autumn 2025 - Calendar Date

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   2 days ago · The September equinox occurs in the Northern Hemisphere between the dates of September 21 to 23 followed by the Winter solstice - December 20 to 23 and then the March equinox - March 19 to 21 and then finally the Summer solstice - June 20 to 22.

   • Type: Season

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     Equinoxes | National Geographic

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     When is the September Equinox? | Autumn Equinox 2020

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     What Is the Autumnal Equinox? (Saturday, September 23rd)

     Sep 22, 2023

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9. www.britannica.com › science › summer-solstice-astronomySummer solstice | Definition & Facts | Britannica

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   Jun 28, 2024 · According to the astronomical definition of the seasons, the summer solstice also marks the beginning of summer, which lasts until the autumnal equinox (September 22 or 23 in the Northern Hemisphere, or March 20 or 21 in the Southern Hemisphere).

10. www.calendardate.com › autumnAutumn/ Fall Equinox - CalendarDate.com

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    5 days ago · As the autumn season progresses, in the Northern Hemisphere from its start around September 21st to 24th (September Equinox) with the sun overhead the equator, it continues south below the equator till it finally reaches the Tropic of Capricorn.