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