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Diji (www.dijisworld.com)'s photostream
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Blue moon with a Partial Lunar Eclipse
A blue moon is the "extra" full moon in years that have thirteen full moons. Most years have twelve full moons which occur approximately monthly, but in addition to those twelve full lunar cycles, each solar calendar year contains an excess of roughly eleven days compared to the lunar year. The extra days accumulate, so every two or three years (7 times in the 19-year Metonic cycle), there is an extra full moon. The extra moon is called a "blue moon." Different definitions place the "extra" moon at different times.
Uploaded on Jan 3, 2010 |
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