Event which really made it possible for the three laws of planetary motion to be discovered was when Tycho Brahe passed away, his aide had complete access to all of his data.
We now know that the orbit of a stable planet around a star like the Sun is always in the shape of an ellipse
More about planetary motion
Johannes Kepler developed three laws to describe the physics of planetary motion. According to the first law, planets orbit the Sun as one of their elliptical targets as they move through space.
According to the second law, when the planet revolves around the ellipse, the radius of the vector connecting it to the Sun sweeps out identical areas in same amounts of time.
The third law states that the ratio of the squares of the orbital period for two planets is equal to the ratio of the cubes of their mean orbit radius
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