Blue Moon - Myths, Facts and History

A blue moon is an additional full moon that appears in a subdivision of a year, either the third of four full moons in a season or, a second full moon in a month of the common calendar.

The phrase has nothing to do with the actual color of the moon, although a literal "blue moon" (the moon appearing with a tinge of blue) may occur in certain atmospheric conditions; e.g., when there are volcanic eruptions or when exceptionally large fires leave particles in the atmosphere. This phenomenon is specific to calendars. Lunar calendars like the Indian national calendar always have one full moon a month.

The term has traditionally referred to an 'extra' moon, where a year which normally has 12 moons has 13 instead. The 'blue moon' reference is applied to the 3rd moon in a season with 4 moons, thus correcting the timing of the last month of a season that would have otherwise been expected too early. This happens every two to three years (seven times in the Metonic cycle of 19 years). The March 1946 issue of Sky & Telescope misinterpreted the traditional definition, which led to the modern colloquial misunderstanding that a blue moon is a second full moon in a single solar calendar month with no seasonal link.

Owing to the rarity of a blue moon, the term "blue moon" is used colloquially to mean a rare event, as in the phrase "once in a blue moon"

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#Moon_(Celestial_Object_With_Coordinate_System) #Blue_Moon #About_Blue_Moon #once_in_a_blue_moon

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