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Heliocentric model of the solar system

Heliocentric model of the solar system. Reading: Unit 11 Copernicus Galileo. Ptolemy’s geocentric model. Endured for nearly 1400 years!. Ockham’s razor. All things being equal, the simplest solution tends to be the best one . Nicolaus Copernicus (1473-1543). Heliocentric model.

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Heliocentric model of the solar system

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  1. Heliocentric model of the solar system Reading: Unit 11 Copernicus Galileo

  2. Ptolemy’sgeocentric model Endured for nearly 1400 years!

  3. Ockham’s razor • All things being equal, the simplest solution tends to be the best one

  4. Nicolaus Copernicus (1473-1543)

  5. Heliocentric model • All orbits are circular • Sun is at the center • Stars do not move (with respect to each other)

  6. Scientific method • Observe phenomenon • Hypothesize cause (how?) • Predict outcome • Test outcome Not established until 17th century!

  7. Galileo Galilei (1564-1642)

  8. Galileo did some really cool stuff • Built his own telescopes! • Found 4 moons around Jupiter • The Milky way was composed of stars • Found mountains on the moon • Observed sunspots • Saw phases of Venus

  9. Phases of Venus The Ptolemaic and Copernican models make very different predictions about the phases of Venus. U. Tenn. Physics & Astronomy Dept.

  10. Phases of Venus Galileo’s drawings of the phases of Venus

  11. Phases of Venus

  12. Starry Messenger

  13. Sunspots, and the Moon • What do these have to do with the Copernican or Ptolemaic models? • Apparently nothing, but... • The philosophy that went with the Ptolemaic system expected the Sun, moon, planets and stars to be perfect. • Heavenly bodies were expected to be entirely different in character from Earth.

  14. Sunspots, and the Moon António Cidadão Armagh Observatory

  15. The “Galileo Affair” • Galileo the pope that the heliocentric model was correct • (He had to take it back) • Home arrest for many years

  16. Heliocentric model

  17. Tycho Brahe (1546-1601) Famous for his accurate observations of the motions of the planets.

  18. Brahe Planetarium

  19. Tycho’s model • Sun orbits Earth • Other planets orbit Sun

  20. Summary • Copernican model • Galileo’s evidence • Tycho

  21. Team Activity #14 Phases of Venus Draw sketches (top then bottom) on page 211 before answering question #1!!

  22. Pick up a review sheet

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