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The 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.
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.
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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.
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.
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 before the ...
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 Hemisphere experience roughly equal amounts of daytime and nighttime. Illustration by Przemyslaw, courtesy of Wikimedia. CC-BY-SA-2.0. Photograph. Photograph.
The Equinox in the Northern Hemisphere occurs twice a year around 20 March (the spring equinox) and around 22 September (the autumn equinox). They occur between the summer and winter...
The September equinox is the moment the Sun crosses the celestial equator—an imaginary line in the sky above Earth’s equator—from north to south. This happens on September 22, 23, or 24 in most years. 10 facts about the September equinox. Equinox Local Time & Date
Mar 15, 2024 · Every six months, the equinox splits Earth's day almost in half. Here's how it happens—and why people have celebrated it since ancient times.
