state the three laws of kepler
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The first law says that the planets revolve in elliptic orbits with sun being at one focus of the same ellipse.
The second law says that the planets sweep equal areas with the radius vector in equal intervals of time, which simple implies that the Arial velocity is constant , ultimately implying that The angular momentum of the planet is constant w.r.t the focal point where sun is situated.
The third law says that the ratio of square of time period of revolution of the planet and the cube of length of semi major axis of orbit is constant for any two planets.
This statement can be easily mathematically verified, by considering a circular orbit for simplicity and furthermore doing a little bit of classical mechanics on these large celestial bodies.
Also, note, that in real sense Kepler's orbits aren't perfectly nice ellipses, they are just circles but having just a tad bit of flatness so then they are legally termed as ellipses.