Why is there two identical 7th month in the lunar calendar in 2006?

Question

If you look carefully in the lunar calendar, you can see that there are two identical 7th month. On English calendar, it happens on July 25 and August 24.

Answer 1

it does happen to align with the rotation of the moon around the earth, very much like the leap year that we have every four years. It just a different kind of measurement, one is based on the movement of the earth revolving around the sun and the other is the moon going around the earth.

Answer 2

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