Vernal Equinox Tacoma 2025. This page provides date and time for vernal equinox in the year 2025 for seattle, washington, united states. The vernal equinox — is an astronomical phenomenon when the sun, in its visible motion along the ecliptic, crosses the celestial equator.

The vernal equinox — is an astronomical phenomenon when the sun, in its visible motion along the ecliptic, crosses the celestial equator. At this moment, the direct rays of the sun are shining down on the equator producing the effect of equal day and night (give or take a few.