Just google, every 2-3 yearsjohnny_t said:A blue moon is when you get a full moon twice in a given month and it happens...erm....you know....not very often.
masona said:Once in the blue moon
Why the blue moon, anybody?
Eddie M said:masona said:Once in the blue moon
Why the blue moon, anybody?
A blue moon occurs due to very rare atmospheric conditions, similar to a copper moon, although I believe this is due to planetary alignment rather than atmospheric conditions.
Least without checking, I think that's the case!