Johannes Kepler
Johannes Kepler was born on December 25, 1571, in Weil der Stadt, Württemberg, and he died at the age of 58 on November 15, 1630, in Regensburg Germany. He was a well known German astronomer who was well known for his three laws of planetary motion.
- Kepler's First Law of Planetary Motion: All planet move around the sun in a elliptical orbit.
- Kepler's Second Law of Planetary Motion: The speed of the planet increases as it is near to the sun, and decreases as it moves away from the sun.
- Kepler's Third Law of Planetary Motion: How long it takes a planet to revolve around the sun is equal to the distance of the sun.
Other than those three laws, Kepler was also known for many other things like giving a correct account on how vision works, created a Keplerian telescope, which is an refracting telescope use for observation which has a positive objectives lens and positive eye piece which gives an inverted image and a wide field of view. 
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