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The History of Astronomy

1 year. 1 month. retrograde motion. west. east. 5 planets. Mercury and Venus near Sun. west. east. Ptolemy's System. GeocentricPerfect CirclesEarthMoon Mercury VenusSunMarsJupiterSaturn Fixed Stars. Aristotle's Physics. 5 elementsNatural Motion. Ptolemy gets tricky. epicycle.

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The History of Astronomy

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    1. The History of Astronomy

    3. Mercury and Venus near Sun

    4. Ptolemy’s System

    5. Aristotle’s Physics

    6. Ptolemy gets tricky

    10. Why Ptolemy needs Epicycles:

    11. Retrograde Motion & Brightness

    12. But why is the planet Always brighter at opposition?

    13. Mercury and Venus near Sun

    14. Ptolemy gets even trickier!!

    15. Arabic Astronomy

    16. Dante Alighieri (1265-1321)

    17. The Renaissance 1300’s-1500’s

    18. Nicolas Copernicus (1473-1543)

    19. A new Day

    20. Copernicus’s issues with Ptolemy

    21. Let’s put the Earth on an Epicycle

    22. Let’s put the Earth on an Epicycle

    24. Retrograde Motion & Brightness

    27. Copernicus Invents New Time

    28. Copernicus Invents New Time

    29. Copernicus measures distances to Inner Planets

    30. Copernicus measures distances to Outer Planets

    31. Good & Bad

    32. It’s still pretty tricky

    33. Stellar Parallax

    34. Tycho Brahe (1546-1601)

    36. Brahe’s Universe

    37. Galileo Galilei (1564-1642)

    38. Proof #1: the Moon

    39. Proof #2: Jupiter’s Moons

    40. Ptolemy

    41. Ptolemy’s Phases of Venus

    44. Johannes Kepler (1571-1630)

    47. #3: The square of the orbital period is proportional to the cube of the average orbital radius

    48. Rene Descartes (1596-1650)

    49. Isaac Newton (1642-1727)

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