People surround the Kukulcan Pyramid at the Mayan archaeological site of Chichen Itza in Yucatan State, Mexico, during the celebration of the spring equinox on March 21, 2019. (Hugo Borges/AFP via ...

South of the equator in the Southern Hemisphere, it's known as the vernal or spring equinox and marks the beginning of spring. During the autumnal equinox, the Earth's axis is tilted neither ...

There are specific times when the astronomical seasons officially turn over -- for fall, it's the autumnal equinox. For spring, it's the vernal equinox. Fall equinox in the Northern Hemisphere ...

Meteosat-9, a European weather satellite, has in the past captured a snapshot of Earth’s terminator during the vernal equinox, which denotes the astronomical start of spring. The fall equinox ...