fa جایگاه غیاث الدین جمشید کاشانی (824-790 ﻫ.ق/ 1421- 1388 م) در مکتب علمی سمرقند تخصصي تاریخ اسلام Islamic History پژوهشي Research &nbsp;<br> Samarqand scientific School which flourished under Olugh Beig&#39;s reign (Timurid prince from A.D1409 to 1450), was the evolutional result of Baghdad, Marageh and Tabriz schools. Ghias al-Din Jamshid Kashani was one of the scientists who had been invited to establish and work in Samarqand Observatory. Some studies have considered his role just to this degree; but revising his works and his researches indicates that he had more influence on Samarqand School and also gained more scientific achievements. By the historical analytic method and by using the primary historic sources and archaeological reports, this article is devoted to answer the following: what was Kashani&#39;s role specially in astronomy and mathematics fields in Samarqand Scientific School? Hypothesis indicates that through his scientific innovations in arithmetic (decimal fraction), mechanics, and geometry, he was the chief designer of Samarqand Observatory and the main accountant of Olugh-Beig Astronomical tables. Furthermore, he was the scientific manager and policy-maker of Samarqand Scientific School and its observatory.<br> &nbsp; غیاث الدین جمشید کاشانی, تاریخ علوم اسلامی, سمرقند, الغ بیگ, رصدخانه‌ی سمرقند Ghias al-Din Jamshid Kashani, Astronomy, Arithmetic, The history of science in Islam, Samarqand, Olugh Beig, Samarqand Observatory. 5 28 http://journal.pte.ac.ir/browse.php?a_code=A-10-2-105&slc_lang=fa&sid=1 Ali Bahranipour علی بحرانی پور bahranipour@hotmail.com 1003194753284600175 1003194753284600175 Yes