Across
- 3. imaginary line
- 5. oval shape
- 6. bright night
- 7. twice a year
- 10. shaded region
- 13. It's round
- 15. moon appears darkened
- 17. illuminating area increases
- 18. same length of day/night
- 19. dark night
Down
- 1. sun gets blocked by moon
- 2. circular path
- 4. bigger than semicircle and less circle
- 8. curved shape
- 9. dust rock and ice trail
- 11. phase of moon
- 12. it's half round
- 14. turning
- 16. illuminating area decreases