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he took part in an experiment to find out the difference in local time between his location and that of part of Uzbekistian
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He invent soap bars and sublimation
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al-Battānī's contribution to astronomy was the determination of the solar year as being 365 days, 5 hours, 46 minutes and 24 seconds, which is only 2 minutes and 22 seconds off.
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He was the first to refute the study of traditional alchemy and the theory of the transmutation of metals into more precious metals
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Muhammad and few others were were first to map the world.
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developed a particle theory
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Al-Hassan ibn al-Haytham invented the Book of Optics
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invented the Plate of Conjunctions, an analog computing instrument used to determine the time of day at which planetary conjunctions