There are two equinoxes every year – in March and September – when the Sun shines directly on the equator and the length of night and day are nearly equal.
On the equinox, night and day are nearly exactly the same length – 12 hours – all over the world. This is the reason it's called an “equinox”, derived from Latin, meaning "equal night"
The March equinox is also known as the "spring (vernal) equinox" in the northern hemisphere and as the "autumnal (fall) equinox" in the southern hemisphere.The March equinox has long been celebrated as a time of rebirth in the Northern Hemisphere. Many cultures celebrate spring festivals and holidays around the March equinox, like Easter and Passover.
But today will be freaky because the Earth will be under the influence of a solar eclipse and full moon, too. Watch this interesting video: