Today, Sunday, March 20, at 12:20 AM EDT the sun will cross directly over the Earth’s equator. This is the vernal equinox when both day and night are about equal. Spring arrives, as well!
An equinox occurs twice a year — in March and September — when the sun shines directly on the equator and the length of day and night are nearly equal in all parts of the world.
Chickadee photo: http://www.cypressfineart.com/artists_2011/janet_mandel/html/9.html
Trivia: How many hours and minutes of daylight on this Spring Equinox day?