What’s a ‘Blue Moon’ in 60 Seconds ‘Once in a blue moon’ there are two full moons in one calendar month. This rare occurrence is called a ‘blue moon.’ But does the moon really turn blue? Dipti Kapadia reports. Photo: NASA

How To See Tonight's Rare Blue Moon Skywatchers are in for a rare treat tonight in the form of a blue moon. Of course, a blue moon isn't actually blue. That's just the term used to describe the moon when it's full for the second time in

What’s a ‘Blue Moon’ in 60 Seconds ‘Once in a blue moon’ there are two full moons in one calendar month. This rare occurrence is called a ‘blue moon.’ But does the moon really turn blue? Dipti Kapadia reports. Photo: NASA

This Friday Will Be That Once-in-a-Blue-Moon Day! This Friday, July 31, North America will have its first blue moon since August 31, 2012.

How To See Friday's Rare Blue Moon Skywatchers are in for a rare treat tomorrow in the form of a blue moon. Of course, a blue moon isn't actually blue. That's just the term used to describe the moon when it's full for the second time in

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There's A "Blue Moon" This Friday - But What Does That Mean? This Friday, there will be a once in a blue moon occurrence. If you step outside, you might find yourself gazing out at a brimming, full moon. Disappointingly, it won't actually be blue; the term is a misnomer. In fact, a blue moon isn't any differen Read more ... t to any other full moon.

Mark Your Calendars: This Friday Will Be That Once-in-a-Blue-Moon Day! This Friday, July 31, North America will have its first blue moon since August 31, 2012.

This Friday Will Be That Once-in-a-Blue-Moon Day! This Friday, July 31, North America will have its first blue moon since August 31, 2012.

This Friday Will Be That Once-in-a-Blue-Moon Day! This Friday, July 31, North America will have its first blue moon since August 31, 2012.