Florida Georgia Line is set to play the 2nd annual Buckeye Country Superfest in Columbus, OH June. 18th and 19th 2016! Joining them on the bill are country stars Jason.
If a Blue Moon is defined as the second Full Moon in a calendar month, we can easily calculate the mean period for such events because: 1  The synodic period between Full Moons is 29.53 days. 2  There are 12 calendar months in a year of 365.25 days. 3  A mean calendar month is [math]\frac{365.25}{12}\approx30.44[/math] days.
At the exact time of the New moon the moon is to close to the sun to see at all. Blue Moon - Today we consider the Blue Moon to be when a full moon occurs twice in one month. This is a relatively new concept for the term. Originaly a blue moon was considered to be when a full moon occured 4 times in a season. A season usualy has 3 full moons. The term has became popular when referring to any rare event. Black Moon - This is a term that is not used frequently and has no exact definition. Some sources use this term when there are 2 new moons in one month similar to the blue moon which is 2 full moons in a month.