Antonyms of noun autumnal_equinox

1 of 2 senses of autumnal equinox

Sense 1
autumnal equinox, September equinox, fall equinox -- (September 22)
       Antonym of vernal equinox (Sense 1)
      => vernal equinox, March equinox, spring equinox -- (March 21)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun autumnal_equinox

2 senses of autumnal equinox

Sense 1
autumnal equinox, September equinox, fall equinox -- (September 22)
       => equinox -- (either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length)

Sense 2
autumnal equinox -- ((astronomy) the equinoctial point that lies in the constellation of Virgo)
       => equinoctial point, equinox -- ((astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic)