Phases of the Moon


Because the cycle of the phases is shorter than most calendar months, the phase of the Moon at the very beginning of the month usually repeats at the very end of the month. When there are two Full Moons in a month which occurs, on average, every 2.7 years, the second one is called a "Blue Moon". See the article "Once in a Blue Moon" for the story of how the usage of this term has evolved Sky & Telescope, March 1999.

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Example using Oreos
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A diagram with Oreos, showing phases of the moon
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A diagram

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Extra information