1. discoverer of planetary motion

2. © 2006 Plano ISD, Plano, TX/Klein ISD 2007 Kepler was born prematurely in 1571 in Weil Der Stadt, Wurtennberg. His parents were poor. His father was a soldier. His mother was an innkeeper’s daughter. Johannes was a sickly child.

3. © 2006 Plano ISD, Plano, TX/Klein ISD 2007 Kepler was a very religious man. He earned a scholarship and went to school at Tubigen University to become a Luthern minister. * Tubingen He became very interested in mathematics and astronomy.

4. © 2006 Plano ISD, Plano, TX/Klein ISD 2007 At the University of Tubigen, a math professor introduced him to the works of Nicolaus Copernicus.

5. © 2006 Plano ISD, Plano, TX/Klein ISD 2007 Copernicus was a Polish astronomer who proposed 60 years earlier that the Earth rotated and revolved with other planets around a stationary sun. This was a very controversial position and went against the teachings of the Catholic Church. Kepler liked the theory so much that he gave up the idea of becoming a minister.

6. © 2006 Plano ISD, Plano, TX/Klein ISD 2007 In his late 20s, Kepler left his teaching position in Graz and moved to Prague to work with with renowned Danish astronomer, Tycho Brahe. * Tubingen Prague * *Graz

7. © 2006 Plano ISD, Plano, TX/Klein ISD 2007 At 30, Kepler became the Imperial Mathematician when Tycho died. Using Tycho’s data, Kepler discovered that the orbit of Mars was an ellipse (instead of a circle), leading to the publication of his first two laws of planetary motion. Tycho Brahe

8. © 2006 Plano ISD, Plano, TX/Klein ISD 2007 Planets move in ellipses with the Sun at one focus.

9. © 2006 Plano ISD, Plano, TX/Klein ISD 2007 The radius describes equal areas in equal times. This means that…

10. © 2006 Plano ISD, Plano, TX/Klein ISD 2007 …the object on the elliptical orbit moves quickly when the radius is short and slowly when the radius is long. The object on the circular orbit moves uniformly.

11. © 2006 Plano ISD, Plano, TX/Klein ISD 2007

12. first to explain the process of vision by refraction first to formulate eyeglasses for near and farsightedness first to explain how both eyes are used for depth perception first to investigate how pictures are made with a pin hole camera

13. © 2006 Plano ISD, Plano, TX/Klein ISD 2007 mathematically described the close packing of equal spheres, which explained the shape of the cells in a honeycomb discovered 2 new regular polydra first to explain how a telescope works first to explain that tides are caused by the moon first to derive the birth year of Christ which is now used universally

14. © 2006 Plano ISD, Plano, TX/Klein ISD 2007 Koch, David. 2004. Johannes Kepler: His Life, His Laws and Times. Available Online. http://www.kepler.arc.nasa.gov/johannes.htmlhttp://www.kepler.arc.nasa.gov/johannes.html Works Cited Kepler’s Laws. http://surendranath.tripod.com/Kepler/KeplersLaws.htmhttp://surendranath.tripod.com/Kepler/KeplersLaws.htm Museum of the History of Science. Available Online. http://www.mhs.ox.ac.uk/tycho/catfm.htm?image2a http://www.mhs.ox.ac.uk/tycho/catfm.htm?image2a