so this post clarified briefly what's the origin of gravitational waves and how they are found. but i'm impressed by Henri Poincare tht he managed to find out that earth is round just by measuring the shadows of sthe tick. He was quite a geneius
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Eratosthenes, not Poincare =P I just used this historical example to simplify poincare's much more complex idea, as he tried to figure out the shape of the Universe (at least, this was an implication of its outcome)