Equinox & Solstice Date Finder
Approximate calendar dates for the spring equinox, summer solstice, autumn equinox and winter solstice in any year.
About this tool
Equinoxes and solstices are the moments the Sun crosses the celestial equator (equinoxes) or reaches its furthest north/south point (solstices) as seen from Earth. Their exact calendar date and time genuinely shift slightly from year to year — by roughly a day — because of the leap-year cycle, and computing the precise minute requires real orbital-mechanics models (such as VSOP87) that are beyond what a lightweight, client-side tool can responsibly provide. This tool instead gives the commonly-cited approximate dates for each season-marking event (typically 19–21 March, 20–21 June, 22–23 September and 20–22 December), using a simple approximation rather than presenting an invented exact time as authoritative. For precise times, consult an astronomical almanac or observatory source.