Equinox means 'equal night' in Latin, referring to the time when daylight and night are nearly the same duration. They organized a picnic on the day of the equinox to enjoy the balanced daylight.
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Happens Twice
Occurs two times each year, so specify by saying 'vernal' for spring, or 'autumnal' for fall. We're planning a festival for the autumnal equinox.
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Cultural Significance
Many cultures celebrate equinoxes, associating them with renewal or thanksgiving rituals. The equinox is significant in many cultures; it's when the Stonehenge festival takes place.