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Early Astronomers

Early Astronomers. What is the purpose behind Astronomy?. Explore the unknown beyond our atmosphere Track planets, satellites (moons), stars, comets Keeping time = Calendar Navigation Agriculture Religious beliefs. Claudius Ptolemy. Greek Astronomer

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Early Astronomers

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  1. Early Astronomers

  2. What is the purpose behind Astronomy? • Explore the unknown beyond our atmosphere • Track planets, satellites (moons), stars, comets • Keeping time = Calendar • Navigation • Agriculture • Religious beliefs

  3. Claudius Ptolemy • Greek Astronomer • Expanded upon Aristoltes’s theories with mathematical calculations • Ptolematic theory • Earth Centered Solar System • Geocentric • Geo = Earth • Centric = middle, center

  4. Geocentric Model • Geocentric model

  5. Nocilaus Copernicus • 1543 A.D. Published Heliocentric Theory • Helio = Sun, Centric = Middle • Heliocentric model • Theory was not popular especially with religious organizations

  6. Tycho Brahe • Favored the geocentric model • Brahe Geocentric Model • Sun and moon orbit Earth • All other planets orbit the Sun

  7. Johannes Kepler • Worked as Brahe’s assistant • Formulated 3 laws of Planetary motion • 1st = Orbits are an ellipse • 2nd = Planets move faster closer to sun • 3rd p²=a³ • Favored Heliocentric Model • Sun not exact center of orbits

  8. Galileo Galilei • Used telescope to observe celestial bodies • Discovered Galilean Moons of Jupiter, sunspots, physical features on moon • Favored Heliocentric model • Used phases of Venus to support model

  9. Isaac Newton • Explained the force that allows planets to orbit around the sun • That force is…….. • Gravity

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