İhsan Fazlıoğlu: "Ubaydi (Celaleddin Ubeydî)" (En/İng.)

İhsan Fazlıoğlu: "Ubaydi (Celaleddin Ubeydî)" (En/İng.)

From: Thomas Hockey et al. (eds.). The Biographical Encyclopedia of Astronomers, Springer Reference. New York: Springer, 2007, p. 1157 

http://dx.doi.org/10.1007/978-0-387-30400-7_1400

ʿUbaydī: Jalāl al‐Dīn Faḍl Allāh al‐ʿUbaydī İhsan Fazlıoğlu

Died 1350 There is little information about the identity and life of ʿUbaydī. According to a recorded note in one of his works, he was the student of Quṭb al‐Dīn al‐Shīrāzī (Istanbul, Süleymaniye, Nuri Efendi MS 149/2, 16b–81b). Since copies of his astronomical works are extant in Turkish manuscript libraries, it is assumed that he was educated, and that he studied in Anatolia. ʿUbaydī's work represents a continuation of the tradition of studying mathematics and astronomy at the Marāgha School and Marāgha Observatory as well as ideas put forth by Ibn al‐Haytham. He was particularly interested in ʿilm al‐hayʾa (theoretical astronomy) and wrote a commentary on Maḥmūd al‐Jaghmīnī's al‐Mulakhkhaṣ fī ʿilm al‐hayʾa al‐basīṭa. ʿUbaydī informs us in the preface that he wrote the commentary in 3 days at the request of some professors and students. There are at least 20 extant copies of the commentary in Turkish manuscript libraries. ʿUbaydī wrote another important astronomical work, in February 1328, entitled Bayān al‐Tadhkira wa‐tibyān al‐tabṣira, which was a commentary on Naṣīr al‐Dīn al‐Ṭūsī's al‐Tadhkira fī ʿilm al‐ hayʾa. “Al‐tabṣira” in the title refers to Muḥammad al‐Kharaqī's al‐Tabṣira fī ʿilm al‐hayʾa. There are at least four extant copies of this work in Turkey. One often finds copies of both works bound together; this was probably intentional since their contents complement one another. ʿUbaydī's two commentaries need to be examined more closely; only then will their place within the tradition of ʿilm al‐hayʾa be established. We do know, however, that ʿUbaydī's teaching of the subject in various schools certainly contributed toward making the tradition more widespread. 

Selected References 

Brockelmann, Carl (1943). Geschichte der arabischen Litteratur. 2nd ed. Vol. 1, p. 624. 

Leiden: E. J. Brill. İzgi, Cevat (1997). Osmanlı Medreselerinde İlim. 2 Vols. Vol. 1, pp. 389, 401–402. 

Istanbul: iz Yayinlare. Karatay, Fehmi Edhem (1966). Topkapı Sarayı Müzesi Kütüphanesi Arapça Yazmalar Kataloğu. Vol. 3, p. 755 (no. 7058), pp. 763–764 (no. 7083). Istanbul: TopKapi sarayi Muzesi Yayinlare. From: Thomas Hockey et al. (eds.). The Biographical Encyclopedia of Astronomers, Springer Reference. New York: Springer, 2007, p. 1157 Courtesy of http://dx.doi.org/10.1007/978-0-387-30400-7_1400 Kātib Čelebī (1943). Kashf al‐ẓunūn ʿan asāmī al‐kutub wa‐ʾl‐funūn. Vol. 2, col. 1819. Istanbul: Mulli Egition Bahantigi Yayinlare. Ragep, F. J. (1993). Naṣīr al‐Dīn al‐Ṭūsī's Memoir on Astronomy (al‐Tadhkira fī ʿilm al‐hayʾa). 2 Vols. Vol. 1, pp. 61–62. New York: Springer Verlag