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- DictionaryE·qui·nox/ˈekwəˌnäks/
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 September 22 and March 20).
1. : either of the two points on the celestial sphere where the celestial equator intersects the ecliptic. 2. : either of the two times each year (as about March 21 and September 23) when the sun crosses the equator and day and night are everywhere on earth of approximately equal length.
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. 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.
May 31, 2024 · equinox, either of the 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.
What Is the Equinox? And What Is the Solstice? By Graham Jones. Equinoxes and solstices are a result of two things: Earth’s tilt and its orbit around the Sun. Earth, like nearly all the planets, orbits the Sun in a tilted fashion. ©NASA Johnson Space Center.
An equinox is one of the two times of the year when the amount of daylight and nighttime hours are just about of equal length. The two equinoxes occur around March 20–21 and September 22–23. The equinoxes occur on these days, but an equinox is not the whole day—it is the moment when the sun is directly above Earth’s equator.
Oct 19, 2023 · 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.
EQUINOX definition: 1. either of the two occasions in the year when the centre of the sun is directly above the…. Learn more.
