Assertion: autumnal equinox | /r/HasProperty | about september
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Source sentences:
text: the two points at which the sun crosses the celestial equator; the spring equinox is about March 21, and the autumnal equinox is about September 22
text: The autumnal equinox - also known as the September or southward equinox - occurs between the 21st and 24th of September each year.