| http://www.w3.org/ns/prov#value | - The works of Ibn al-Haytham and Ab?? Rayh??n B??r??n?? eventually passed on to Western Europe where they were studied by scholars such as Roger Bacon and Witelo.[9][note 2] Omar Khayy??m (1048???1131), a Persian scientist, calculated the length of a solar year and was only out by a fraction of a second when compared to our modern day calculations.
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