Ancient Astronomy & The Geocentric Universe

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Across
  1. 4. (lower)planets whose orbits lie between the earth and the sun
  2. 8. the backward motion of a planet (westward motion instead of eastward motion)
  3. 10. (2800-1100 BCE); From the stone age; Calendar/almanac
  4. 11. a model of the universe in which the earth lies at the center and all other bodies move around it
  5. 12. the study of the workings of the universe on the largest scales
  6. 13. the Greek word that the word “planet” was derived from; meaning “wanderer”
Down
  1. 1. Ptolemy’s geocentric model of the solar system
  2. 2. the larger circle around earth which the center of each planet’s epicycle was thought to move around
  3. 3. in the original geocentric model of the universe, each planet was thought to move uniformly around a small circle, called the epicycle
  4. 5. The larger circle of the Geocentric Model
  5. 6. proposed that all the planets revolve around the sun
  6. 7. Originally came up with the Geocentric Model
  7. 9. The creator of the Ptolemaic Model