The German, Johannes Kepler was one of the scientific pioneers of modern astronomy. Lived between 1571 and 1630. Astronomer was a disciple of Rudolf II, the Dane Tycho Brahe, whom he met in Prague and succeeded after his death. A fervent supporter of the Copernican system in 1609 enunciated his first two laws on the movement of the planets in elliptical orbits around the sun These investigations were published in his Astronomia nova. Ten years later made his third law which states that the squares of the times used by the planets to travel their orbits are directly proportional to the cubes of their distances from the Sun, which appeared in his book Harmonices mundi. Also devoted to studies on optics, physics and terrestrial magnetism. It was the first scientist to accurately calculate the longitude and latitude.
Also Astronomy and Harmonices mundi nova, stand Cosmic Mystery, Stereometría, De cometis, and two books on optical studies; Paralipomena and Dioptrice.
Kepler had a hard life and poor health. He died in the modest room in the house of a merchant, in southern Germany.