On the last day of July 2015, the inhabitants of the Earth will amazing astronomical phenomenon: they will be able to see the blue moon. In Russia, this spectacle will be available everywhere.
Despite its name, the color of the moon will not change. The name of the phenomenon is given in consequence of its rarity in English tirade Once in a blue moon is considered an idiom and used to mean so rarely that I can't remember when." Sometimes to see a blue color natural satellite of the Earth, but this is due to the optical effect, and an official astronomical days a blue moon relationships do not have.
Phenomenon with a graceful name traditionally happens once in two or three years. The period of time between 2 full moons - 29,53 days, slightly shorter than the Central length of the month, in consequence, approximately 2,7154 in the calendar accumulates an extra full moon, once again Recalling that a year might be 13 full moons instead of the ordinary 12.
In previous times the Terrans saw the blue moon in 2012, and in coming times it will happen in 2018. With all this, the phenomenon of far-sometimes you can see it everywhere. For example, on March 30, 2010 blue moon was available only in time zones East of UTC 07. Soon additional the full moon on July 31, surprising the fact that will delight everyone on earth.
According to National Geographic, the appearance of the blue moon to predict unrealistic. The optical result is due to the fact that light with wavelengths corresponding to blue color and its shades, from time to time scattered not only on the molecules of air, but also on the dust particles. The reason for this can be large fires, volcanic eruptions and similar incidents.
For example, in the canadian province of Alberta the thick smoke from the smoldering peat bogs in the fall of 1950 extended South and East of the country. Thanks to this, the moon and even the sun, visible during the day, became pale lilac and blue shades.