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What exactly is a waning or waxing gibbous or crescent Moon?

Question: What exactly is a waning or waxing gibbous or crescent Moon?

Answer: First, gibbous refers to the shape you can see when the lighted surface of the Moon is bigger than a crescent shape; the crescent shape is defined by the distinct points on the lighted sliver. The Moon moves in these phases: new Moon, waxing crescent, first quarter Moon, waxing gibbous, full Moon, waning gibbous, last quarter Moon, waning crescent, back to new Moon. So waxing means the moon is on its way to being full; waning means the Moon is on its way to being new (the phase you really can't see).