Moon math From: Natural History | Date: March 1, 1999| Author: | Copyright American Museum of Natural History Mar 1999. Provided by ProQuest LLC.Copyright information

The full Moon shows up twice in March, on the 2d and the 31st. Whenever two full Moons appear in a month, the second is christened a Blue Moon. Because approximately 29.5 days separate one full Moon from the next, all months in our Gregorian calendar, except February, are fair game for a Blue Moon.

The expression "once in a blue moon" suggests an indefinite interval, yet the frequency of Blue Moons can be precisely calculated. The Moon's phases recur on the same dates every nineteen years-a rhythm known as the Metonic Cycle. Packed into this period are 235 lunar months (236 full Moons) but ...

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