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The full moon occurs approximately once every 29.5 days. This means there are about 12-13 full moons in a year, varying slightly due to the length of lunar months and the calendar year.
The phrase "Once in a blue moon" dates back to the early 19th century as a way to describe something that occurs very rarely. It refers to the occurrence of a second full moon in a calendar month, which happens every 2-3 years. The blue moon is not actually blue in color, it is a rare event that gives rise to the saying.
The moon in the days before and after a full moon appear as a gibbous moon. A gibbous moon is anything between a full moon and a half moon.
A full moon occurs once every 29.5 days, which is the time it takes for the moon to cycle through its phases from full moon to full moon.
Waning Gibbous is the moon phase that comes after the Full Moon.
A lunar eclipse can only happen during a full moon when the Earth is positioned between the sun and the moon, casting its shadow on the moon.