![Friday's Blue Moon Is the Last Until 2015 [VIDEO]](https://helios-i.mashable.com/imagery/archives/02fwT9GF6nX9rkd2M0olx5h/hero-image.fill.size_1248x702.v1647021326.jpg)
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Did you know Blue Moons aren't actually blue? But they -- as the popular idiom suggests -- rare occurrences.
The second full moon of the month will occur on Friday, Aug. 31, a phenomenon which only happens seven times every 19 years or roughly once every two and a half years.
It takes the moon 27.3 days to complete its full orbit around the Earth. In order for two full moons to land during the same calendar month, one must be at the very beginning and the other at the very end.
How will you celebrate Friday's Blue Moon? Let us know how you'll mark the last Blue Moon until 2015.
BONUS: 48 Years of Inspiring Moon Photography
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