Across
- 6. Responsible for the slight changes in equatorial coordinates over time (10)
- 8. Calculated by subtracting the declination from 90 (5, 8)
- 10. A measure of the angular distance from the First Point of Aries (5, 9)
- 13. The time since an object last crossed your meridian (4,5)
- 14. A star does this as it passes through the meridian on its upper transit (9)
- 16. The point directly over your head (6)
- 17. The bearing from north of the object (7)
- 19. The line passing directly overhead from north to south (8)
Down
- 1. The path of the Sun as it appears in our sky (8)
- 2. A type of day designed to keep the stars in a fixed location (8)
- 3. The angle between the celestial equator and the object (11)
- 4. A user-friendly coordinate system (10)
- 5. A precise coordinate system (10)
- 7. The unit for measuring right ascension (5)
- 9. Unit for measuring declination (7)
- 11. Meaning 'closeness', the reason Solar System objects have continuously changing coordinates (9)
- 12. The Greek letter used as a symbol for declination (5)
- 14. An object that never 'rises' or 'sets' (11)
- 15. The angle between the observer's horizon and the object (8)
- 18. The kind of motion that makes the stars appear to move (7)