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Announcement... Extra Credit!

Announcement... Extra Credit!. See a planetarium show at Museum of the Rockies: Sky Quest Current Sky Not a laser show or a kid’s show! Sign in at the front desk. Free admission! 20 points — same as an activity! One time only. By the last day of classes!. Announcement... Extra Credit!.

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Announcement... Extra Credit!

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  1. Announcement... Extra Credit! • See a planetarium show at Museum of the Rockies: • Sky Quest • Current Sky • Not a laser show or a kid’s show! • Sign in at the front desk. • Free admission! • 20 points — same as an activity! • One time only. By the last day of classes!

  2. Announcement... Extra Credit! Taylor Planetarium current schedule:

  3. Review: Spherical Earth Motion of the stars Motion of the Sun & Moon Solar System: Geocentric models Aristotle Ptolemy Copernicus Developing a model of the solar system

  4. Models of the solar system • Stars move each night • Sun moves through the stars throughout the year • Planets • move slowly through the stars • planet means “wandering star” • Earth-centered or Sun-centered

  5. Aristotle’s model (384-322 BC)

  6. Problem: retrograde motion • Planets sometimes back up! • Aristotle’s model doesn’t do that.

  7. Retrograde motion of Mars http://www.lasalle.edu/~smithsc/Astronomy/retrograd.html

  8. Retrograde motion of Mars

  9. Retrograde motion of Mars

  10. Retrograde motion of Mars

  11. Retrograde motion of Mars

  12. Retrograde motion of Mars

  13. Retrograde motion of Mars

  14. Retrograde motion of Mars

  15. Retrograde motion of Mars

  16. Retrograde motion of Mars

  17. Retrograde motion of Mars

  18. Retrograde motion of Mars

  19. Retrograde motion of Mars

  20. Earth is at the center Earth is imperfect, celestial sphere is perfect Circles govern heavenly motions Cladius Ptolemy (85-165)

  21. Ptolemy’sgeocentric model

  22. Retrograde motion (Ptolemy) http://www.lasalle.edu/~smithsc/Astronomy/retrograd.html

  23. Retrograde motion (Ptolemy)

  24. Retrograde motion (Ptolemy)

  25. Retrograde motion (Ptolemy)

  26. Retrograde motion (Ptolemy)

  27. Retrograde motion (Ptolemy)

  28. Retrograde motion (Ptolemy)

  29. Retrograde motion (Ptolemy)

  30. Retrograde motion (Ptolemy)

  31. Retrograde motion (Ptolemy)

  32. Retrograde motion (Ptolemy)

  33. Retrograde motion (Ptolemy)

  34. Retrograde motion (Ptolemy)

  35. Retrograde motion (Ptolemy)

  36. Retrograde motion (Ptolemy)

  37. Retrograde motion (Ptolemy)

  38. Retrograde motion (Ptolemy)

  39. Epicycle Ptolemy’s model was actually even more complicated.

  40. Copernicus’ heliocentric model • Ptolemy’s model was used for almost 1400 years. • Copernicus proposed a very different model in 1543: • Planets, including Earth, move around Sun. • Retrograde motion is explained without epicycles.

  41. Retrograde motion

  42. Retrograde motion (Copernicus) http://www.lasalle.edu/~smithsc/Astronomy/retrograd.html

  43. Retrograde motion (Copernicus) http://www.lasalle.edu/~smithsc/Astronomy/retrograd.html

  44. Retrograde motion (Copernicus) http://www.lasalle.edu/~smithsc/Astronomy/retrograd.html

  45. Retrograde motion (Copernicus) http://www.lasalle.edu/~smithsc/Astronomy/retrograd.html

  46. Retrograde motion (Copernicus) http://www.lasalle.edu/~smithsc/Astronomy/retrograd.html

  47. Retrograde motion (Copernicus) http://www.lasalle.edu/~smithsc/Astronomy/retrograd.html

  48. Retrograde motion (Copernicus) http://www.lasalle.edu/~smithsc/Astronomy/retrograd.html

  49. Retrograde motion (Copernicus) http://www.lasalle.edu/~smithsc/Astronomy/retrograd.html

  50. Retrograde motion (Copernicus) http://www.lasalle.edu/~smithsc/Astronomy/retrograd.html

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