Johannes Kepler T J Osler
Johannes Kepler (pronounced /ˈkɛplɚ/) (December 27, 1571 – November 15, 1630) was a Germanmathematician, astronomer and astrologer, and key figure in the 17th centuryscientific revolution
The Great Comet of 1577, which Kepler witnessed as a child, attracted the attention of astronomers across Europe
In astronomy, Kepler's three laws of planetary motion are: • "The orbit of every planet is an ellipse with the sun at a focus." • "A line joining a planet and the sun sweeps out equal areas during equal intervals of time." • "The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit."
Kepler's Platonic solid model of the Solar system from Mysterium Cosmographicum (1600)
A plate from Astronomiae Pars Optica, illustrating the structure of eyes
Diagram of the geocentric trajectory of Mars through several periods of retrograde motion.Astronomia nova, Chapter 1, (1609).
The iconic frontispiece to the Rudolphine Tables celebrates the great astronomers of the past:Hipparchus, Ptolemy, Copernicus, and most prominently, Tycho BraheSee http://www.hps.cam.ac.uk/starry/ for details of above.