It's only March, but it's time for the final supermoon of the year.

That's right, the "super worm equinox moon" is Wednesday night. 

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A supermoon occurs when the full moon reaches its closest point to Earth, making the moon appear brighter and larger.

Wednesday's supermoon occurs on the same day as the vernal equinox, the first day of spring. The moon will be completely full at 9:43 p.m. ET, about four hours after the spring equinox officially arrives at 5:58 p.m. Wednesday.

March's full moon is referred to as the "worm moon," named after earthworms that often emerge from the ground in the spring.

Two supermoons have already occurred this year one in February, the snow moon, and one during the lunar eclipse in January.