With a little more than one orbit per month, the Moon wanes at least once each and every month.
The moon orbits the Earth every month and as it does so, we see different parts of the moon lit up by the sun, which causes the moon to go through 'phases'.
wax and wane
The revolving of the earth and the rotating of the moon.
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rise set wax wane
During the time at sea, the sailors saw the moon wax and wane three times.
the earth blocks it from the sun
You mean the name? Wayne. What the moon does? wane.
Yes it does because it revolves around the sun
That completely depends on when you start watching it. The question is like asking: "Does it get light or dark outside first ?"
Yes, Harvest Moon is the full moon closest to the autumn equinox, and the moon always wanes after being full.
It's the earth shadow