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At "half Moon" we see half of the Moon's hemisphere that is facing Earth.

But "half Moon" isn't what astronomers call that phase of the Moon.

It is called a "quarter Moon" phase.

That's because the Moon has completed one quarter (at First Quarter phase) or three quarters (at Third Quarter phase) of an orbit around the Earth since new Moon.

(Another possible reason is that we see a quarter of the total surface of the Moon at these phases.)

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9y ago

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