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Astronomy Review (Things within Solar Systems (Star- large glowing ball of…

- - - - Earth: things stand still, change=chaos
      - Heavens= Perpetual Motion, no change ever
  - - - Lunar Eclipses- Earth is 4X bigger than moon
      - Solar Eclipses- Sun and Moon have same apparent size
  - - - Planets move in ellipses with Sun at one Focus
      - Equal area is swept out in equal time
      - Square of the orbital period and cube of the semi-major axis are in a fixed ratio