space
Some nights the Moon looks like a full round circle, and other nights it's just a thin sliver.
The Moon does not actually change shape, what changes is how much of its sunlit side we see as it travels around Earth, since the angle between Sun, Moon, and Earth shifts, revealing more or less of the bright half.
The Moon is not shrinking, its size stays the same, and clouds covering it would only be a temporary local weather effect, not the reason it cycles through phases every month.
This monthly cycle takes about 29 and a half days to complete, and ancient calendars in many cultures were actually built around tracking this very pattern.
space
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