What is an Equinox. And what causes it?

An equinox is an astronomical event that occurs twice a year when the sun is directly above the equator, resulting in nearly equal day and night lengths across the globe. This phenomenon happens around March 21 (vernal equinox) and September 23 (autumnal equinox). The equinox is caused by the tilt of the Earth's axis and its orbit around the sun, which aligns the sun's rays with the equator during these times.