PHY 121 Module 3 Crossword

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Across
  1. 3. The apparent shift in the direction of an object as a result of the motion of the observer.
  2. 4. Centered on Earth.
  3. 5. An ancient astronomer who argued that the Earth must be round.
  4. 6. Polish astronomer who argued that Earth is a planet and that all the planets circle the Sun.
  5. 9. Compiled astronomical knowledge in a book called the Almagest, which is a valuable resource for historians.
  6. 12. A pseudoscience in which the positions of objects are thought to be mystically significant and are used to guide life choices.
  7. 13. To change velocity; to speed up, slow down, or change direction.
  8. 14. __________ Motion: The temporary apparent backward motion of a planet as Earth swings between it and the Sun
  9. 16. chart showing the positions of the planets in the sky at the moment of a person’s birth.
  10. 17. The time it takes for Earth to revolve around the Sun.
  11. 18. A Turkish astronomer who measured the celestial coordinates of objects in the sky and created a star catalog.
Down
  1. 1. Centered on the Sun.
  2. 2. Italian astronomer who was first to use a telescope to view the heavens
  3. 7. The study of the organization and evolution of the universe.
  4. 8. Where a planet orbits in a small circle, the center of which revolves about another circle (the deferent)
  5. 10. A Greek living in Egypt who determined the first fairly accurate measure of the diameter of the Earth.
  6. 11. The changing direction of the Earth’s axis, a motion similar to a spinning top.
  7. 15. A belt around the sky centered on the ecliptic