Once in a Blue Moon Hike Event Cache

"Sometimes also called the Fruit Moon; such monikers were used for a full moon that occurs during the first week of September, so as to keep the Harvest Moon from coming too early in the calendar. This is the second time the moon turns full in a calendar month, so it is also popularly known as a "Blue Moon."  Full moons occur on average each 29.53 days (the length of the synodic month), or 12.3683 times per year; so months containing two full moons occur on average every 2.72 years, or every 2 years plus 8 or 9 months" (www.space.com)
 
"Note that the months of July, August, and September in 2012 contain four full moons, and August 2012 has two full moons. However, the period from the summer solstice to the autumn equinox in 2012 contains only three full moons, as the September 2012 full moon comes after the equinox. Similarly, the December full moon in 2012 comes after the solstice. Thus calendar 2012 has 13 full moons including two in August, yet it contains no blue moon" (wikipedia.org)