Full Sturgeon Moon, a 'blue moon' to some, rises tonight

Tuesday night's full moon will be a blue moon, according to one definition of the term.

Most know a blue moon as the second in a calendar month, but an earlier definition classified it as the third full moon in a season with four full moons (most seasons have just three full moons). Read more about the history of the debate over the two definitions at EarthSky.org or Space.com.

Whether you consider it blue or not, it's also known as the Full Sturgeon Moon, Green Corn Moon or Grain Moon.

You may have noticed it nearly full shining through the clouds this weekend -- it should be plenty bright for the next several nights.

It reaches its most "full" point of its monthly cycle at 9:45 p.m. Tuesday. Clear skies are forecast.

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