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31st July 2015 - Blue Moon over Looe.

The first reference to a blue moon comes from a proverb recorded in 1528,

according to the Oxford English Dictionary :
If they say the Moon is blue, we must believe that it is true

31st July 2015 - Blue Moon over Looe © Ian Foster / fozimage

The phenomenon occurs when there is a second full moon in one calendar month.

31st July 2015 - Blue Moon over Looe © Ian Foster / fozimage

The infrequent nature of this lunar event led to the phrase "once in a blue moon" to signify a rare occurrence.

31st July 2015 - Blue Moon over Looe © Ian Foster / fozimage

It does not actually mean the moon will be blue.

31st July 2015 - Blue Moon over Looe © Ian Foster / fozimage

31st July 2015 - Blue Moon over Looe © Ian Foster / fozimage

All images © Ian Foster / fozimage