There has been a rare opportunity to witness a unique lunar event in the night sky, a so-called "blue moon".
When two full moons are seen within a single calendar month, the second is called a blue moon. It is a quirk arising from the interaction of the lunar cycle - around 29.5 days - and the human calendar in which months range from 28 to 31 days long. The next blue moon is not due until 2018 Credit :BBC.com |
Gerry Walsh
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