Space Exploration - 1

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Across
  1. 2. Instrument that measures azimuth
  2. 4. The hunter constellation
  3. 6. Angle measured clockwise from north
  4. 8. Unit of measurement in space that represents the distance light travels in a year
  5. 9. Polish astronomer that proposed the heliocentric model
  6. 13. Set of axes of any kind that is used to describe the positions or motions of things
  7. 17. Greek philosopher that proposed the geocentric model
  8. 18. Instrument that measures altitude
  9. 19. Scientist that added "epicycles" to Aristotle's model of the universe
  10. 20. The angle above the horizon (0 - 90°)
  11. 21. The Sun rises and sets at a rate _______ from the stars
Down
  1. 1. Star that never rises or sets
  2. 3. The Great Bear constellation
  3. 5. Model of the universe that places the Sun at the center
  4. 7. The ________ rises and sets at a rate different from the stars
  5. 10. Small circular movement of planets
  6. 11. Grouping of stars that form a pattern
  7. 12. Model of the universe that places the Earth at the center
  8. 14. Unit of measurement in space that represents the distance from Earth to the Sun
  9. 15. Term used to describe the Sun, Moon, planets and stars
  10. 16. On each successive day, a given star rises and sets ________ minutes earlier