Longitude and Latitude + 2 Greek Mapmakers

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Across
  1. 3. an imaginary circle in the heavens above the Earth's equator
  2. 4. round planetary orbits that Hipparchus described to account for the planets' movements in an Earth-centered universe (He was wrong:()
  3. 7. concentric circles in the sky beginning at the north celestial pole and ending at the equator
  4. 9. the point in the heavens above Earth's North Pole
  5. 12. mathematics dealing with measuring triangles
  6. 13. how high in the sky an object is located
Down
  1. 1. the angular measurement from north toward the east along the horizon of an object in the sky
  2. 2. imaginary lines in the sky stretching from the North or South Pole to the equator (also called ascensions)
  3. 5. imaginary parallel lines that circle the globe above and below the equator in an east-west direction
  4. 6. places where imaginary lines across the heavens meet
  5. 8. the point in the sky directly overhead
  6. 10. the line where the sky meets the Earth
  7. 11. imaginary lines on the globe going from north to south