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Bookmark or Share- Equinox - WikipediaThe modern definition of equinox is the instant when the Sun's apparent geocentric ecliptic longitude is 0° ( northward equinox) or 180° ( southward equinox ). [35] [36] [37] Note that at that moment, its latitude will not be exactly zero, since Earth is not exactly in the plane of the ecliptic.
- Equinox | Definition, Dates, & Facts | Britannicaequinox, 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 an equinox? | SpaceWhat causes an equinox? When do the equinoxes happen? Who discovered the equinoxes? Additional resources. Twice a year, day and night are about the same length in both the Southern and Northern...
- What's the Difference Between a Solstice and an Equinox?Vernal equinox (about March 21): day and night of equal length, marking the start of spring. Summer solstice (June 20 or 21): longest day of the year, marking the start of summer. Autumnal equinox (about September 23): day and night of equal length, marking the start of autumn.
- March equinox 2025: All you need to know - EarthSkyWhat is it? The March equinox – aka the vernal equinox – marks the sun’s crossing above Earth’s equator, moving from south to north. Earth’s tilt on its axis is what causes this northward shift...
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