-- 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.
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7 full weeks
Every year has 52 full weeks. In addition, ordinary years have one more day, and leap years have two more days.
There are approximately 52 weeks in a year.
52 weeks in a year A year has 52 weeks, and 53 Thursdays at the most There are 52 weeks in a year.
How many full weeks there are in summer holidays depends on the school disctrict the school is in. In most cases summer vacation ranges from 6 to 10 full weeks.