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The first astronomical textbook had all the knowledge of everything astronomical discovery.
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The astrolabe was improved by Muslims
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The Sundial was made by Ibn Al-Shatir so the people could tell time
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Around 1190, Al-BItruji published an alternative geocentric system to Ptolemy's model.
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The euatorium was built for the specific purpose to of seeing where the sun is.
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The mechanical calendar was made because they had no sense of time in term of months and years
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The theory of planetary motion was made to prove that everything is moving.
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The tusi couple is device that has a small circle orbiting a bigger cirlce
