Planetary Science: Investigation 1 & 2

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Across
  1. 3. spinning on an axis
  2. 6. traveling around something
  3. 7. ariel photo from directly above
  4. 8. imaginary axle that a planet spins on
  5. 10. somewhere in the universe is called
  6. 11. how far above sea level
  7. 15. straight line along which an observer has an unobstructed vision
  8. 16. 0 degrees latitude, imaginary line around the middle of a planet
  9. 17. Located in Greenwich England or 0 degrees longitude
Down
  1. 1. term used to describe the position from which an observation is made
  2. 2. reference star pointed to by Earth's North Pole
  3. 4. where sky and land meet
  4. 5. assemblage of objects distance and directions that you use to establish location
  5. 9. angular distance north and south from Earth's equator
  6. 12. path and length of time one object takes to travel around another object
  7. 13. is how far above Earth
  8. 14. angular distance of a place east and west of the meridian