fall equinox

Definitions of fall equinox
  1. noun
    the moment when the sun's rays shine directly on the equator, marking the beginning of autumn (fall) in either the northern or southern hemisphere
    synonyms: autumnal equinox
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    type of:
    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
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