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law of cosines
FUN FACT.
How Fast does the Earth Move?
Most everyone on the planet knows that the Earth is rotating, but not so many think about how fast the Earth is moving, or why it's rotating in the first place.
It seems as if astronomy likes to play with our intuition. Looking at the Sun, Moon and stars rising, crossing the sky and setting, intuition would tell us that it's the sky which is rotating but we know that isn't so. We know it's because the Earth is rotating.
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