Technically a Blue Moon is the second Blue Moon of the month, not of the year.
It just so happens to also be the 13th one this year.
It is ALWAYS the 13th in a year. The only way you can have an extra one in a month is to have a 13th.
And here is the wikipedia page, which explains what I already explained. Link
--------------------------------------------------------------------------- In the end they will lay their freedom at our feet and say to us, 'Make us your slaves, but feed us.'
Tin Can HitMan, try to catch him if you can, Secret Robo-Agent with a secret Robo-Plan, Keep your windows shut, lock your doors airtight, Cause the Tin Can HitMan is comin' for you tonight.
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