Earth, Moon and Sun unit

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Across
  1. 3. the moon at any stage between new moon and first quarter and between the last quarter and the succeeding new moon when less than half of the illuminated hemisphere is visible.
  2. 5. a path described by one body in its revolution about another.
  3. 6. an imaginary line about which a body rotates.
  4. 7. the apparent shape of the Moon's directly sunlit portion as viewed from the Earth.
  5. 11. move or cause to move into a sloping position.
  6. 12. half of the Earth south of the equator.
  7. 14. a regular oval shape, traced by a point moving in a plane so that the sum of its distances from two other points.
  8. 16. Meaning “of the sea,” in Latin.
  9. 19. the time or date (twice each year) at which the sun reaches its maximum or minimum declination, marked by the longest and shortest days (about June 21 and December 22).
  10. 21. a tide of greater-than-average range around the times of new moon and full moon.
  11. 22. the partially shaded outer region of the shadow cast by an opaque object.
  12. 24. half of the Earth north of the equator.
  13. 25. the action of rotating around an axis or centre.
  14. 26. the time or date (twice each year) at which the sun crosses the celestial equator when day and night are of approximately equal length (about September 22 and March 20).
  15. 27. to have a progressively smaller part of its visible surface illuminated, so that it appears to decrease in size.
Down
  1. 1. an eclipse in which the moon appears darkened as it passes into the earth's shadow.
  2. 2. the throwing back by a body or surface of light, heat, or sound without absorbing it.
  3. 4. an eclipse in which the sun is obscured by the moon.
  4. 8. the state of the tide when at its highest level.
  5. 9. a certain phase of the moon, when it's bulging outward but isn't quite full.
  6. 10. a bowl-shaped depression formed by the impact of a meteorite or bomb.
  7. 13. either of the two tides that occur at the first or last quarter of the moon when the tide-generating forces of the sun and moon oppose each other and produce the smallest rise and fall in tidal level.
  8. 15. the state of the tide when at its lowest level.
  9. 17. the fully shaded inner region of a shadow cast by an opaque object, especially the area on the earth or moon experiencing the total phase of an eclipse.
  10. 18. any phase of the moon during the lunar cycle between the new moon and the full moon.
  11. 20. a period of time during the year.
  12. 23. a sudden, radical, or complete change.