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RE: Why is the casting shadow of the moon only 70 miles wide?
So the answer I was looking for was: Gravity! However since there were only two people who voted and gave an answer that is the direct effect of gravity I will give you both a 50% upvote! Congrats!
Why is the answer gravity? It seems (with my limited understanding) That the umbra is only 70 miles wide while the panumbra is actually bigger. What does gravity have to do with it? Unless you are talking about gravity bending the light slightly but does it really make that much difference?