first point of Libra


Also found in: Dictionary, Thesaurus, Legal.
Related to first point of Libra: Invernal equinox

first point of Libra

See first point of Aries.

first point of Libra

[¦fərst ¦pȯint əv ′lē·brə]
(astronomy)

first point of Libra

The point of intersection of the ecliptic and the celestial equator (equinoctial) when the sun is moving from the north to the south direction. It is denoted by the symbol λ. Also called autumnal equinox. * See first point of Aries and ecliptic.