What Is a Supermoon?

A supermoon happens when the full moon coincides with the moon’s closest approach to Earth in its orbit. Supermoons make the moon appear a little brighter and closer than normal, although the difference is hard to spot with the naked eye. 

According to Fred Espanak, eclipse expert and retired NASA astrophysicist, there will be four supermoons in 2021, in March, April, May and June. The Farmer’s Almanac only lists two, in April and May, but Espanak’s definition of a supermoon as a full moon within 90% of its closest approach to Earth gives us four to view this year. 

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