The spring equinox marks the start of astronomical spring. The date is determined by the Earth's tilt on its axis as it travels around the Sun. At the equinox, the Earth's axis is tilted neither towards nor away from the Sun, making day and night nearly equal in length. The equinox happens twice a year - in March and in September.

The spring equinox - also known as vernal equinox - marks the first day of spring in the northern hemisphere, according to the Old Farmer's Almanac. It occurs when the sun is directly above the equator, resulting in nearly equal daylight and night hours.