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It's not.
Five.
-- Always at least 12. -- If the first one occurs by January 10th, then there's enough time left in that calendar year for 12 more, for a total of 13. Stated another way: All of the moon's phases seen during the first 10 days of January will occur 13 times in that year. All of the others will occur 12 times in that year.
The least common denominator of three fourths and five sixths is twelve.
The least common denominator of five sixths and one fourth is: 12.