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   equinox

   /ˈɛkwɪnɒks/

   noun

   • 1. the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of approximately equal length (about 22 September and 20 March).
   • ▪ another term for equinoctial point

   Word Origin late Middle English: from Old French equinoxe or Latin aequinoctium, from aequi- ‘equal’ + nox, noct- ‘night’.

   Scrabble Points: 23

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2. People also ask

   What is a solar equinox?

   • A solar equinox is a moment in time when the Sun crosses the Earth's equator, which is to say, appears directly above the equator, rather than north or south of the equator. On the day of the equinox, the Sun appears to rise "due east" and set "due west". This occurs twice each year, around 20 March and 23 September. [a]

   Equinox - Wikipedia

   en.wikipedia.org/wiki/Equinox

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   How many equinoxes are there in a year?

   • An equinox is an event in which a planet ’s subsolar point passes through its Equator. The equinoxes are the only time when both the Northern and Southern Hemispheres experience roughly equal amounts of daytime and nighttime. On Earth, there are two equinoxes every year: one around March 21 and another around September 22.

   Equinox - National Geographic Society

   www.nationalgeographic.org/encyclopedia/equinox/

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   What does equinox mean?

   • More precisely, an equinox is traditionally defined as the time when the plane of Earth 's equator passes through the geometric center of the Sun 's disk. Equivalently, this is the moment when Earth's rotation axis is directly perpendicular to the Sun-Earth line, tilting neither toward nor away from the Sun.

   Equinox - Wikipedia

   en.wikipedia.org/wiki/Equinox

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   When do equinoxes occur?

   • The equinoxes occur on the longest and shortest days of the year. Equinox definition: the time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 (vernal equinox, or spring equinox ) and September 22 (autumnal equinox )..

   EQUINOX Definition & Meaning | Dictionary.com

   www.dictionary.com/browse/equinox

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3. en.wikipedia.org › wiki › EquinoxEquinox - Wikipedia

   en.wikipedia.org › wiki › Equinox

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   Equinox - Wikipedia. A solar equinox is a moment in time when the Sun crosses the Earth's equator, which is to say, appears directly above the equator, rather than north or south of the equator. On the day of the equinox, the Sun appears to rise "due east" and set "due west". This occurs twice each year, around 20 March and 23 September. [a]

4. www.merriam-webster.com › dictionary › equinoxEquinox Definition & Meaning - Merriam-Webster

   www.merriam-webster.com › dictionary › equinox

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   Learn the origin, history, and usage of the word equinox, which means either of the two times each year when the sun crosses the equator and day and night are of equal length. Find out how equinox relates to the seasons, solstices, and the Gregorian calendar.

5. dictionary.cambridge.org › dictionary › englishEQUINOX | English meaning - Cambridge Dictionary

   dictionary.cambridge.org › dictionary › english

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   An equinox is when the sun is directly above the Equator and day and night are about the same length. Learn more about the spring and autumn equinoxes, their dates, and how they are used in astronomy and language.

6. Videos

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     What is an Equinox? | National Geographic

     22 Sep 2017

     497.7K views

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     0:48

     space.com

     What is an equinox?

     18 Aug 2020

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     1:34

     bbc.com

     Who, What, Why: What is an equinox?

     23 Sep 2015

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7. www.nationalgeographic.org › encyclopedia › equinoxEquinox - National Geographic Society

   www.nationalgeographic.org › encyclopedia › equinox

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   Oct 19, 2023 · An equinox is when the sun is directly above the Equator, creating equal day and night on Earth. Learn how equinoxes work, their effects on seasons and climate, and their cultural significance.

8. www.timeanddate.com › astronomy › equinox-solsticeWhat Is the Equinox? And What Is the Solstice? - timeanddate.com

   www.timeanddate.com › astronomy › equinox-solstice

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   An equinox is when the Sun is directly above Earth's equator and the day and night are almost equal. Learn about the two equinoxes each year, their dates, and how they differ from solstices and seasons.

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9. www.dictionary.com › browse › equinoxEQUINOX Definition & Meaning | Dictionary.com

   www.dictionary.com › browse › equinox

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   Equinox definition: the time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 (vernal equinox, or spring equinox ) and September 22 (autumnal equinox )..

10. www.space.com › what-is-an-equinoxWhat is an equinox? | Space

    www.space.com › what-is-an-equinox

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    Mar 19, 2024 · Equilux ("equal light"), on the other hand, is the term for when day and night are exactly equal. And, because of how sunrise and sunset are defined, the equilix occurs a few days...