In the sky there was “Blue Moon»
The addition of astronomical vectors July 31 it possible to observe a rare phenomenon – the second full moon in a calendar month. Last time, “Blue Moon” appeared in the sky August 31, 2012.
Florida, USA, 31 July 2015 © Brent | Space weather
The term “blue moon “comes from the English idiom« Once in a Blue Moon ». It translates as “One day at a blue moon” and is an analogue of the Russian proverb “Once in a blue moon” – that is very rare.
The appearance of the moon a blue shade is even more rare. To achieve this, the optical effect of the atmosphere should be obscured ashes, dust, smoke, or aerosols. As a result, additional scattering moon takes the blue or purple-violet.
Puerto Rico, July 30, 2015 © Frankie Lucena | Space weather
If the atmosphere is transparent, the color night light stays natural – ash-gray.
Queensland, Australia, July 31, 2015 © Stephen Mudge | Space weather
Source: oko-planet. su
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