Blue moon
One of the rarest moon phase
Herausgegeben: Miller-Jones, Edward R.
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The blue moon is an event which occurs every 2.7 years on average. It happens that there is also a phenomenon called twice a blue moon which involves two blue moon apparition within the same year. For instance in 1999, the blue moon appears both in January and March...
