How we figured out that Earth goes around the Sun?

Astronomy. That is how. The movements of celestial bodies on the sky were not going according to the predictions of a geocentric model, a model in which Earth was at the center, and thus astronomers had to accept the fact that Earth revolves around the Sun ie the theory of heliocentrism.

Now we can see this happening by using the satellites and by using our state of the art telescopes and updated laws of physics. Science is great.

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