Saturday, March 20th marks the spring equinox, the official first day of spring.
The March equinox marks the moment the Sun crosses the celestial equator, the imaginary line in the sky above the Earth’s equator, from south to north. This happens on March 19th, 20th, or 21st each year. The March equinox has long been celebrated as a time of rebirth in the Northern Hemisphere. Many cultures celebrate spring holidays around the March equinox like Easter and Passover.