Observing The Skies

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Across
  1. 5. Greatest scholar in muslim history, born in the region of Khwarizm.
  2. 6. similar to a globe,shows a map of stars.
  3. 9. was used as calculator
  4. 11. A huge library/observatory
  5. 12. Was famous both as an astronomer and as a mathematician, also worked at the Ismaili fort of Almaut.
  6. 13. The science of studying the stars, planets and other celestial bodies.
Down
  1. 1. used for telling time by sun.
  2. 2. Group of stars.
  3. 3. first space telescope.
  4. 4. special place to observe skies.
  5. 7. First people to study astronomy
  6. 8. Proposed a model of universe
  7. 10. used to measure the position of star or planets in degree.