(WOKI) There is a rare super blue moon set to grace the skies this week.

NASA defines the term supermoon “as either a new or full moon that happens when the moon is within 90% of perigee, its closest approach to Earth.”

The moon will be closest to Earth for this orbit Wednesday morning at 11:55. According to NASA, the moon will appear full for three days, from Tuesday to Friday morning.

“About 25% of all full moons are supermoons, but only 3% of full moons are blue moons,” according to NASA.

The last time two full supermoons graced the sky in the same month was in 2018. It won’t happen again until 2037.