quarter Moon if its half of a sphere then its half moon
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the moon isn't a perfect sphere its kinda like a oval in a way The shape of the moon is an oblate spheroid, just like earth
half moon
A shape in the night sky is a star. It could also be a circle if the moon is the shape being referred to.
When half of the lighted side of the moon's surface can be seen, the moon looks like a half circle filled in. Any less than that, and the moon appears crescent-shaped. I suspect that you're not describing what you're imagining.
The moon is a sphere.