It's almost time for another blue moon, but we're not talking about a drink. In most cases, the term describes the phenomenon that takes place when there are two full moons in the same calendar month. According to Earth Sky, .

Generally, the moon is only full about once every 30 days. This means the blue moon phenomenon can only take place if there is a full moon in the first few days of a month. The last full moon was on July 2.

The phenomenon occurs once every two or three years. The last one took place on Aug. 31, 2012. After this month, , according to the Orlando Sentinel.

(MORE:)

The Other Blue Moon

The term blue moon has been a point of contingency for many years and has developed quite a few definitions throughout time. Earth Sky claims that the Maine Farmer’s Almanacdefines the blue moon as the third full moon out of four in a season. If there are usually three full moons in summer, spring, winter or fall season, then a blue moon would describe the third moon in a rare month that had four.

The concept of a seasonal Blue Moon may have been around longer than the modern definition, but the fight continues as to which definition is more accurate. Either way, your odds of seeing a moon that is actually blue in color are far less likely. These are entirely unpredictable and are based on conditions in the sky among other factors. NASA points to the year 1883 when Indonesia's Krakatoa erupted and

MORE ON WEATHER.COM:Stunning Images of the Moon

A full moon rises behind Glastonbury Tor as people gather to celebrate the summer solstice on June 20, 2016 in Somerset, England. Last night's strawberry moon, a name given to the full moon in June by Native Americans because it marks the beginning of strawberry picking season, last occurred on the solstice on June 22, 1967 and it will not happen again on the summer solstice for another 46 years until June 21, 2062. (Matt Cardy/Getty Images)