Vocabulary Puzzle Earth,Moon,and Sun

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Across
  1. 5. an object's spinning motion about its own axis
  2. 6. that part of a shadow in which all light from a given source is excluded
  3. 7. the angle between the plane of the earth's equator and the plumb line (direction of gravity) at a given point on the earth's surface
  4. 8. the branch of science that deals with celestial objects, space, and the physical universe as a whole
  5. 9. tidal levels and water motion which would result from Earth's rotation and gravitational effects of, in particular, the Earth, Sun and Moon, without any atmospheric influences
  6. 11. the object's orbital motion around another object
  7. 12. a moon, planet or machine that orbits a planet or star
  8. 14. a half-shadow region that occurs when a light source is only partly covered by an object
  9. 18. a period of moderate tides when the sun and moon are at right angles to each other
  10. 19. any of the varying appearances of a celestial body as different amounts of its disk are seen (from Earth, ordinarily) to be illuminated by the Sun
  11. 20. an invisible line around which an object rotates, or spins
  12. 21. complete or partial obscuring of a celestial body by another
  13. 23. an event in which a planet's subsolar point passes through its Equator
Down
  1. 1. the equinox in autumn, on about September 22 in the northern hemisphere and March 20 in the southern hemisphere
  2. 2. the force by which a planet or other body draws objects toward its center
  3. 3. occurs when the moon is either new or full and closest to Earth
  4. 4. a tool that astronomers use to see faraway objects
  5. 10. occurs when the moon “eclipses” the sun
  6. 12. an event in which a planet's poles are most extremely inclined toward or away from the star it orbits
  7. 13. a bowl-shaped depression, or hollowed-out area, produced by the impact of a meteorite, volcanic activity, or an explosion
  8. 15. any flat, dark plain of lower elevation on the Moon
  9. 16. occurs when the Moon passes through the Earth's shadow
  10. 17. the equinox in spring, on about March 20 in the northern hemisphere and September 22 in the southern hemisphere
  11. 22. a regular, repeating path that one object takes around another object or center of gravity