On the night of July 2 the Russians will see the Blue Moon

On the night of July 2, residents of the European part of Russia will be able to watch the Blue Moon. This is reported in the monthly astronomical forecast, published on the website of the Moscow Planetarium.

Blue Moon is a phenomenon in which a full moon is observed twice a month. In 2015, this event will happen on July 2 and 31. Previously, the Blue Moon could be seen in August 2012 of the year, and the next time the event is expected in January of 2018.

The phenomenon happens, as a rule, once every two or three years. Its name comes from the English idiom Once in a Blue Moon, meaning the rarity of any situation. Sometimes with this phenomenon, the satellite of the Earth seems to the observer to change its color as a result of atmospheric phenomena.