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... > Observational astronomy > Astronomical techniques > Astrometry > Astronomical coordinate systems > Equatorial coordinate system > Equinox > Autumnal equinox

Preferred term

Autumnal equinox  

Definition

  • One of the two points where the ecliptic crosses the celestial equator. At the autumnal equinox the Sun appears to be moving across the equator from the northern celestial hemisphere to the southern celestial hemisphere. The instant of the event. (en)

Broader concept

Contributor

Editorial note

URI

http://astrothesaurus.org/uat/123

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