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Keplers laws

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  • 1. Kepler’s Laws Yep, all three!
  • 2. Greek Observations Early Greeks were the first to truly notice the planets in our solar system. In fact, planets is Greek for wanderers. Greeks believed that the earth was spinning within a larger dome called the celestial sphere. Greeks believed in a geocentric model, where the earth is at the center.
  • 3. Greek astronomer: Ptolemy Ptolemy believed, as other Greeks did, that Earth was at the center; however, he hypothesized that the planets were moving on flat planes. The Geocentric model was accepted as truth for nearly 1,500 years!
  • 4. Copernican Revolution! Polish Astronomy, Nicolaus Copernicus helped to develop the heliocentric model, where the sun is at the center rather than the Earth. Many people had trouble accepting this model, even into the 1600’s!
  • 5. Good old Galileo Galilei Because Galileo use the newly invented telescope, he was able to discover more than his predecessors. Galileo discovered 4 moons orbiting Jupiter (known as the Galilean Moons) Galileo also helped to support and develop the heliocentric model.
  • 6. Tycho Brahe & Johannes Kepler Late 1500’s, Danish astronomer Tycho Brahe and his assistant Johannes Kepler worked over a 20 year period collecting data through observations of the night’s sky. After Brahe died in 1601, Kepler continued to analyze and study the data- from that came his 3 laws.
  • 7. Kepler’s 1st Law Through his observations of Mars’s orbit, he discovered his first law: The Orbital path of the planets are NOT circular- they are an ellipse (oval shape). This discovery disproved the long help belief of circular orbits.
  • 8. Kepler’s 2nd Law Kepler then discovered that the speed of a given planet changes as it revolves around the sun. The closer a planet is to the sun, the faster it moves. The farther away it is, the slower it moves.
  • 9. Kepler’s 3rd Law Kepler also discovered that the time it takes a planet to orbit the sun and it’s average distance from the sun are directly related. The closer a planet is to the sun, the faster it’s revolution. The farther a planet is, the slower the revolution.
  • 10. Kepler’s 3rd Law Kepler also discovered that the time it takes a planet to orbit the sun and it’s average distance from the sun are directly related. The closer a planet is to the sun, the faster it’s revolution. The farther a planet is, the slower the revolution.

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