To the best of our knowledge, astrologer Richard Nolle coined the term supermoonover 30 years ago. The term has only recently come into popular usage. Nolle has defined a supermoon as:
… a new or full moon which occurs with the moon at or near (within 90% of) its closest approach to Earth in a given orbit.
That’s a pretty generous definition and allows for many supermoons. By this definition, according to Nolle:
There are 4-6 supermoons a year on average.
Photos: The supermoon rises over Colorado
Cloudy skies on the Front Range made it tough to see last night's supermoon, the last of the year.
A supermoon occurs when a full moon or new moon is in its closest proximity to the earth, as earthsky.org explains:
We've been collecting supermoon images from Colorado photographers through the summer. Take a look at the gallery above and share your photos with firstname.lastname@example.org.