Solstice And Equinox Dates 2025. The vernal equinox marks the. Equinox & solstice calculator this page will calculate when the equinoxes and solstices are for a given year.

After the vernal equinox, the length of night continues to shorten and daylight hours increase until the summer solstice arrives. Daylight saving time conversion is not included) this is an official u.s.