Search results
- 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).
Powered by Oxford Dictionaries
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. [7] [8] 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.
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. Did you know? Equinox and the Seasons.
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 )..
There are only two moments each year when neither pole points toward the Sun, and the Sun lies directly above Earth’s equator. These moments are the equinoxes. The March equinox happens sometime between March 19 and 21. The September equinox occurs sometime between September 21 and 24.
us / ˈi·kwəˌnɑks, ˈek·wə- / Add to word list. either of the two times during the year when the sun crosses the equator and day and night are of equal length, about March 21st and September 23rd. (Definition of equinox from the Cambridge Academic Content Dictionary © Cambridge University Press)
Equinox comes from the Latin words aequi, which means "equal," and nox, which means "night." The vernal equinox is considered the first day of spring: finally, the day and night are of equal length. But why does equinox refer to night?
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.
either of the two occasions in the year when the center of the sun is directly above the Equator, and day and night are approximately equal in length: the vernal (= spring) equinox. the autumn equinox. Compare. equilux. SMART Vocabulary: related words and phrases. Astronomy. albedo. Andromeda.
Mar 19, 2024 · Additional resources. Twice a year, day and night are about the same length in both the Southern and Northern Hemispheres. This phenomenon is called an equinox, which comes from the Latin words...
Britannica Dictionary definition of EQUINOX. [count] : a day when day and night are the same length. There are two equinoxes in the year: the spring (or vernal ) equinox, which occurs around March 21, and the autumn (or autumnal ) equinox, which occurs around September 23. — compare solstice.
