Spring is almost here — officially, at least. The vernal equinox arrives on Thursday, marking the start of the spring season for the Northern Hemisphere and the fall in the Southern Hemisphere.

The vernal equinox arrives on Thursday, marking the start of the spring season for the Northern Hemisphere and the fall in the Southern Hemisphere. On the equator, the sun will be directly overhead at ...

Nowruz, the Iranian New Year, is based on the spring equinox, for example. And at the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern ...

Nowruz, the Iranian New Year, is based on the spring equinox, for example. And at the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern ...

Nowruz, the Iranian New Year, is based on the spring equinox, for example. And at the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern ...

Nowruz, the Iranian New Year, is based on the spring equinox, for example. And at the Mayan site Chichen Itza in Mexico, people gather during the equinox to watch the sun create a shadow pattern that ...