Sun-Earth-Moon System

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Across
  1. 4. the phase where the left half of the moon is lit
  2. 6. the season when the hemisphere is tilted toward the Sun
  3. 7. the time it takes for an object to rotate around its axis one time
  4. 12. the lunar phase when the entire face of the moon is lit up
  5. 15. the movement of an object around another object
  6. 16. the time it takes for an object to go around another object one time
  7. 18. a tide created when the Earth, Moon and Sun are in a perpendicular arrangement
  8. 19. the two times of the year when day and night are of equal length
Down
  1. 1. a tide caused when the Earth, Moon and Sun are oriented in a straight line
  2. 2. the period during which the lit part of the moon is increasing
  3. 3. the thin curved shape of the moon
  4. 5. the period during which the lit part of the moon is decreasing
  5. 8. the movement of an object around its axis
  6. 9. the season when the hemisphere is tilted away from the Sun
  7. 10. the lunar shape that is more than half but not yet full
  8. 11. either of two times of the year when the axis is at its greatest tilt
  9. 13. the imaginary line connecting the north and south poles
  10. 14. the phase where the right half of the moon is lit
  11. 17. the path an object takes around another object
  12. 18. the phase where the moon is between the Earth and Sun, making it invisible