A truly rare occurrence is to witness a full moon twice in one month - however, it does happen. The Farmer's Almanac dates back as far as 1792. A few years later in 1820, Maine became a state. (Not to say that farmers did not keep almanacs before statehood was recognized). Maine farmers would record the full moon in red print for each month. When a second full moon occurred in the same month, the ink was changed to blue. Blue moons have never occurred in the month of February
Once in a Blue Moon
گاه گاهي، به ندرت
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