Gravity is a myth - the Earth sucks!
All masses attract each other. The strength of this gravitational force, according to Newton, depends on the magnitude of the masses and the inverse square of the distance between them.

Einstein improved the understanding of gravitational in his General Theory of Relativity by postulating that masses bend or curve the space-time continuum similar to a bowling ball resting on a trampoline. Any object now moving in this space-time would travel along a curved path.

Using this fact and the inverse square nature of the law of gravitation lets us calculate the distance to the moon using just a stopwatch, a pendulum, and a few observations.
Newton's 2nd law of motion implies that a mass in a gravitational field would experience an acceleration. A simple pendulum is sufficient to measure the acceleration due to gravity on the surface of the Earth.

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