What was Ibn Sina remembered for? What was special about the number system he used?
2. What did Al Baruni write about? What did he measure and
calculate?
3. How does observing the night stars and their positioning help
navigators find their way at sea?
4. AL Baruni wanted people to understand that the Earth is round
and surrounded by sea. How was that concept useful to people at
that time?
5. Why were the calculations of Al Baruni important to our
knowledge of the Earth and for navigation?

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