In Photos: ‘Super Worm Moon,’ 2021’s First Of Four Supermoons, Dazzles Sky-Watchers Across The World 

What is a supermoon? It’s a full Moon that coincides (or thereabouts) with the Moon’s perigee—the closest point in the Moon’s monthly orbit of Earth. It’s a result of the Moon’s orbit being slightly elliptical, which make the full Moon sometimes looks slightly larger. 

There is no official definition of what a supermoon technically is, and is not, but astronomer Fred Espenak defines a supermoon as a full Moon at perigee occurring “within 90% of its closest approach to Earth in a given orbit.” Since it was 362,170 km from Earth, that makes the “Worm Moon” a supermoon. However, other definitions preclude it from being called a supermoon. 

Either way, there are three more superman’s coming up—April 27’s “Super Pink Moon”, May 26’s “Super Flower Moon” (the closest and largest full Moon of 2021) and June 24’s “Super Strawberry Moon.”

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