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Keep Looking Up. Topic 2 Part 1. ``Astronomy compels the soul to look upward and leads us from this world to another.\'\' - Plato. Early Astronomy. Early Models. Big Dipper. Orion. Scorpio. The celestial sphere appears to rotate about the celestial poles (completing one cycle in one day).

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keep looking up

Keep Looking Up

Topic 2

Part 1

astronomy compels the soul to look upward and leads us from this world to another plato
``Astronomy compels the soul to look upward and leads us from this world to another.\'\' - Plato
the celestial sphere appears to rotate about the celestial poles completing one cycle in one day
The celestial sphere appears to rotate about the celestial poles (completing one cycle in one day).
slide13
Celestial north pole stays still (North star aka Polaris)
  • Stars appear to move in counterclockwise fashion.
slide14
Question: What causes the observed circular motions of the stars, Sun, Moon, and planets about the celestial pole?
  • Hypothesis 1: The Earth is stationary, and the stars, Sun, Moon, and planets revolve around it.
  • Hypothesis 2: The stars, Sun, Moon, and planets are not revolving about the Earth; it is the Earth which is rotating about its polar axis, once per day.
question what causes this apparent motion of the sun relative to the background stars
Question: What causes this apparent motion of the Sun relative to the background stars?
  • Hypothesis 1: The Earth is stationary, and the Sun revolves around it at a slightly slower rate than the celestial sphere does.
  • Hypothesis 2: The Earth revolves around the Sun, once per year.
the moon moves west to east relative to the stars completing one cycle in one month
The Moon moves west to east relative to the stars (completing one cycle in one month).
question what causes this apparent motion of the moon relative to the background stars
Question: What causes this apparent motion of the Moon relative to the background stars?
  • Hypothesis 1: The Earth is stationary at the center of the universe, and the Moon revolves around it a a slower rate than the celestial sphere does.
  • Hypothesis 2: The Moon revolves around the rotating Earth, once per month.
wanderers
Wanderers
  • Only 5 planets to the naked eye.
  • Mercury, Venus, Mars, Jupiter, Saturn
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