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