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.
About this calculator
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.