The full Moon in May 2016, will be this type of blue moon. The older definition, which is recorded in early issues of the Maine Farmer's Almanac, states that the blue moon is the third full moon in a season that has four full moons. For a blue moon to occur, the first of the full moons must appear at or near the beginning of the month so that the second will fall within the same month (the average span between two moons is 29.5 days). According to the more recent definition, a blue moon is the second full moon in a calendar month. There are in fact two definitions for a blue moon. Third full moon in a season of four full moonsĪlthough the full moon on July 31, 2015, will look like an ordinary full moon, it's actually a bit extraordinary-a blue moon. "What's a Blue Moon?" from Sky & Telescope.
By Borgna Brunner and Anne Marie Imbornoni Related Links
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