What is Blue Moon?

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Is the moon could be blue? Blue Moon is a term for the second full moon occurring in the same month. This phenomenon usually occurs every 2.5 - 3 years once. This is due to pay off the old moon 29.5 days a month while in the AD calendar was 31 days. When this phenomenon last month did not look blue. This phenomenon is called a blue moon as the second full moon event (in a month occurred 2 times the full moon) are rare.

Real moon blue really happened in 1992, on the Moon eclipse December 9, 1992. Some small discs moon during an eclipse looks bluish. The other part was dark, not red like usual. This phenomenon is related to the eruption of Mount Pinatubo. This happens because the scattering of the sun by the presence of ozone and particles larger than the wavelength of red color (0.7 microns). Such particles can be sourced from the ashes of a volcanic eruption.

Real blue moon occurs most phenomenal time of the eruption of Krakatoa in 1883. Not only during an eclipse, the Moon also appear bluish every night, whether the crescent, half, or full moon. Blue moon occurred during the years after the eruption. Dust Krakatau eruption contaminate the atmosphere and lead to white light which is usually shown in a blue moon. Blue Moon also occurred after the eruption of Mount St Helens in 1980 and Mount El Chicon in Mexico in 1983.

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