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