Definition of autumnal point in English:

autumnal point

See synonyms for autumnal point

noun

Astronomy
  • The point on the celestial equator at which it is intersected by the ecliptic and which the sun passes at the autumnal equinox; = "first point of Libra".

Origin

Mid 18th century; earliest use found in Nathan Bailey (d. 1742), lexicographer and schoolmaster.