Blue Moons

A blue moon is the second full moon that appears in a calendar month. The period from one full moon to another is approximately 29 and a half. Months with 31 days are more likely to witness a blue moon, whereas February, with its 28 days (29 days in leap years), cannot host a blue moon. On average, a blue moon appears once every 33 months or full moons, totaling 41 occurrences per century, or roughly seven instances every 19... meer