Answer: EQUINOX

Possible questions:


Spring time we know 8 Answers
March time we know 2 Answers
March event we know 4 Answers
September event we know 2 Answers
March 21 occurrence we know 1 Answer
Fall time we know 2 Answers
Semiannual event we know 1 Answer
Occasion at Stonehenge we know 1 Answer
March or September event we know 1 Answer

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