Monday marks the end of astronomical summer in the Northern Hemisphere. At 10:29 p.m., the sun can be seen directly overhead on the equator in the western Pacific.

The Spring Equinox, also known as the Vernal Equinox, will arrive on Mar. 20 at 5:58 p.m. ET in the Northern Hemisphere in 2019 — and in general, it can occur anytime between March 19 and March 21.

A woman photographs the Cherry Blossom trees as they bloom around the Tidal Basin in Washington, D.C., April 4, 2018. The spring or vernal equinox on Wednesday marked the beginning of the season.