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By Nolle’s definition, a supermoon is extreme when it is at “100% or greater mean perigee.” Essentially, that means moons ...

Watch the Sept. 21 partial solar eclipse live online with this handy livestream. Coverage begins at 2 p.m. EDT (1800 GMT).

A rare October Harvest Moon will rise this weekend, doubling as a supermoon and kicking off a series of celestial shows. The moon will reach its full phase at 11:48 p.m. on Monday, Oct. 6, but will ...