The full moon on Friday is no ordinary full moon, it's a blue moon.
Will it appear blue? Not at all.
A blue moon means it is the second full moon in a calendar month.
Since the moon cycle is about 29.5 days, a blue moon doesn't happen too often, thus the phrase "once in a blue moon."
The last blue moon was in 2012, the next one after this will be in 2018.
With some exceptions, it occurs once every 3-ish years. So it would be fairly accurate to say "the Spurs win a title once in a blue moon."
Let's take it a step further. A double blue moon is much more rare; this would be a calendar year where a blue moon occurs in two separate months.
The last time that happened was 1999 -- the next will be 2018 in January and March.
Make sure you witness it, because it's a 19-year wait until the next one in 2037.
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