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March 21 - Vernal Equinox
The first day of spring
Day & night equal duration
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June 21 - Summer Solstice
Longest day, shortest night
(northern hemisphere)
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September 21 - Autumnal Equinox
The first day of autumn
Day & night equal duration
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December 21 - Winter Solstice
Shortest day, longest night
(northern hemisphere)
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