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Across
  1. 6. of or having to do with astronomy, the science of the sun, stars, planets, and other space objects
  2. 7. to move in a circle around another object
  3. 8. the length of a straight line passing through the center of a circle or sphere, from one side to another
Down
  1. 1. to judge or discover the value of something
  2. 2. nearly correct or exact; about
  3. 3. anything that is shaped like ball or a globe
  4. 4. rules, standards, or tests by which something or someone can be judged or measures
  5. 5. the act or process of determining something using mathematics