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Gravitation has played a key role in the development of man's understanding of motion. The motion of celestial bodies such as the moon, the earth, the planets etc. has been a subject of great interest from a long time. Famous Indian astronomer and mathematician, Aryabhat, studied these motions in great detail, most likely in 5 th century A.D., and wrote his conclusion in his book Aryabhatiya. He proposed that earth revolves about its own axis and moves in a circular orbit about the earth.
About a thousand years after Aryabhat, the brilliant combination of Tycho Brahe and Johnaase Kepler studied the planetary motion in great detail. Kepler formulated his important findings in his three laws of planetary motion.
Let us see each of these laws in detail