Kepler's Three Laws of Planetary Motion

In the late 16th century there was a Danish astronomer called Tycho Bray. He made extremely accurate astronomical observations about the planets and their orbits around the earth. Based on all this data his protege by the name of Kepler constructed what are now known as the three laws of planetary motion. The idea of an ellipse finally allowed Kepler to explain the various discrepancies in the orbits of the planets that had plagued astronomy for thousands of years since Greek times.