Wednesday is not only the Spring equinox, it's also the start of the Spring season, and your last shot to check out a supermoon...at least for this year. According to KTVB, this month's supermoon is the third and last of the year and will occur at about 8:43 p.m. MST.

So what happens exactly during a supermoon event? According to KTVB, during the equinox, "the sun is directly above the earth's equator, and both hemispheres of the earth get the same amount of daylight and nighttime for one day." During this day, the moon is full and at "nearly its closest to the Earth" (that's known as the perigree phase) giving it that "supermoon" effect. Astrologer, Richard Noelle, coined the term back in 1979 and defined it as a "new or full moon which occurs with the moon coming within 90 percent of its closest approach to Earth."

If you miss this supermoon, you're going to have to wait a while for the next one, as this will be that last of 2019. Did you know that each supermoon gets a unique name? This is a tradition that dates back to Native American traditions, when tribes kept track of the seasons by naming each of the full moons. This one is being named 'Worm Moon.' You can actually check out the name for each of the full moons during the year HERE.

The reason March's full moon is the 'Worm Moon'? According to KTVB, It's because during this time, the ground is thawing and "worm casts appear."