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So here you have two definitions of a blue moon but the one for a calendar blue moon does not describe the true meaning of a blue moon. Here's why: Traditionally the Moon Boot came in a longer length in a style that was non-tapered. While this style is still the more popular one, a shorter version and/or a more fitted one also exist. Once again the decision as to which one is better is a matter of personal choice. Of course not all retailers may have all material range, colours or styles available. On occasion February will have no full moons and January and March will both have two. In this case, you have two calendar blue moons in the same year. However, there can be no more than one in a year's time or it would not be that rare of an event. Using the Farmer's Almanac description there can be a maximum of one in a year.