Concept information
Preferred term
Equinox
Definition
- One of the two points on the celestial sphere where the celestial equator intersects the ecliptic, that is when the apparent ecliptic longitude of the Sun is 0° or 180°. At equinox, the length of the day and the night are equal all over the globe. The equinox is not a fixed point; it moves due to precession and nutation. If only precession is considered, we deal with the mean equinox of date. If nutation is also taken into account, then we are concerned with the true equinox. (en)
Broader concept
Narrower concepts
- Autumnal equinox (en)
- Vernal equinox (en)
Contributor
Editorial note
URI
http://astrothesaurus.org/uat/470
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