Retired astrophysicist Fred Espenak has been observing the moon for about 60 years.
Visibility map of the May 15 to 16, 2022 lunar eclipse.due to varying definitions. Espenak's definition is based on the first-ever supermoon, when astrologer Richard Nolle in 1979 defined it as a full moon that comes within 90% of its closest point in the orbit to Earth.
But Espenak calculates supermoons to also account for changes in the moon's orbit during each lunar cycle, including the perigee and apogee . NASA, which follows the strict 90% definition, says the Flower Moon is not a supermoon, but that June's full moon will be. "The limits of what you get as a supermoon varies from one orbit to another," he added."So, in order to determine whether a particular moon is a supermoon or not, you have to look at the specific orbit of the moon during that lunation cycle." Epsenak's definition of supermoon will put the next four full moons in a row as supermoons: May 16, June 14, July 13 and Aug. 12. But he noted that streak is not particularly uncommon.
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