Astronomy: Earth, Moon, and Sky

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Across
  1. 3. what shadowed portion of the Moon is visible from the Earth
  2. 5. the main vertical 'great circle'
  3. 6. GMT 0
  4. 8. moon, 🌕
  5. 9. we never see it from the Earth
  6. 11. 🌔
  7. 12. amount of material
  8. 17. there are 24
  9. 18. horizontal
  10. 19. rising and falling of sea level caused by the Moon’s gravity
  11. 20. how long a revolution takes
  12. 21. 🌒
  13. 22. moon, 🌑
Down
  1. 1. farthest distance to the Sun
  2. 2. the space something occupies
  3. 4. vertical
  4. 7. caused by variance in Sun's energy
  5. 10. speed and direction of a body along its ellipse
  6. 11. mass' attractive force
  7. 13. the only horizontal 'great circle'
  8. 14. shares center point with the Earth's sphere's center point
  9. 15. closest approach to the Sun
  10. 16. ratio of mass to volume