Equinox & Solstice Dates
Find the exact date and time of the March and September equinoxes and June and December solstices for any year, free online.
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Using Jean Meeus' astronomical algorithms (accuracy within about a minute for 1900–2100), the tool gives the instant of each equinox and solstice in UTC and in your time zone. The seasons start at these moments in astronomical reckoning; in the southern hemisphere the seasons are reversed.