İhsan Fazlıoğlu: "Darandawi (Mehmed Darendevî)" (En/İng.)
Dārandawī: Muḥammad ibn ʿUmar ibn ʿUthmān al‐
Dārandawī al‐Ḥanafī
From: Thomas Hockey et al. (eds.). The Biographical Encyclopedia of Astronomers, Springer Reference. New York: Springer, 2007, pp. 177-179 Courtesy of http://dx.doi.org/10.1007/978-0-387-30400-7_333
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Born Dārende near Malatya, (Turkey), 1739
Died Istanbul, (Turkey)
Dārandawī, philosopher, logician, mufassir (scholar of Qurʾānic exegesis), and astronomer, became
known for preparing a perpetual calendar as well as for his studies on the relation between
astronomy and religion. After receiving his elementary education in his home region, he took
courses in the town of Marʿash from Sāchaqlı‐zāde Muḥammad al‐Marʿashī (died: 1733), one of the
most important Ottoman teachers (mudarris) of the time. Dārandawī came to Istanbul during
Sultan Aḥmad III's reign and worked as mudarris in various schools (madrasa). Furthermore, he
administered Aḥmad III's private treasury. Dārandawī died during the reign of Maḥmud I.
Dārandawī, as a versatile Ottoman mudarris who lived during the Tulip Period (1718–1739),
participated in various scientific and cultural activities. Out of the committees founded by the
Grand Vizier Newshehirli Dāmād Ibrāhīm Pasha for the translation of scientific and literature books
into Turkish, he worked in the one responsible for the translation of Badr al‐Dīn al‐ʿAynī's (died:
1451) ʿIqd al‐jumān fī tarīkh ahl al‐zamān, an encyclopedia dealing with a number of sciences such
as cosmology, astronomy, geography, zoology, and history. It consisted of 24 volumes, each volume
being approximately 200 pages. Furthermore, in the madrasas where Dārandawī worked, he
trained many important students of the future such as Ālashahīrlī ʿUthmān ibn Ḥusayn. Dārandawī
was a preeminent scholar in the cultural circles of the time, especially in fields such as Qurʾānic
exegesis (tafsīr), the science of disputation (ʿilm al‐munāẓara), the philosophy of logic and
language, astronomical instruments, the knowledge of timekeeping ( ʿilm al‐mīqāt), and religious
astronomy. His works of logic included al‐Tafriqa bayn madhhab al‐mutaʾakhkhirīn wa‐bayn al‐
qudamāʾ (al‐mutaqaddimīn) fī al‐qaḍiyya waʾl‐taṣdīq (Süleymaniye Library, Yazma Bağıșlar MS 60),
Risāla fī Ḥall mushkilāt mabāḥith al‐taʿrīf (Süleymaniye Library, Hafid Efendi MS 160), Risāla fī
ajzāʾ al‐qaḍiyya (Süleymaniye Library, Bağdadlı Vehbi MS 895), Risāla fī imkān al‐ʿāmm
(Süleymaniye Library MS 449), Risāla fī Mabāḥith al‐wasīṭa (Ali Emiri, Arabi MS 352), and Risāla fī
Ashkāl arbaʿ fī al‐manṭiq (Köprülü Library, Ahmet Pasha MS 352). In them, he focused on
definition, proposition, judgment, and the relation between propositional possibility (imkān) and the
physical world. Dārandawī criticized the opinions of the theologians (mutakallims), tending more
toward Ibn Sīnā's methods in these subjects.
Dārandawī was interested in the relation of religion and science and put a special emphasis on the
relation between religion and astronomy. Working within the paradigm of his time and with a consideration of the religious dimensions, he wrote a book, at the request of his students, entitled
Risāla fī Ḥall mushkilāt masāʾil thalāth (in Arabic) (Kandilli Observatory MS 107), in which he
attempted to answer three astronomical questions that Kātib Čelebī (died: 1657) had previously
asked Shaykh al‐Islām Bahāʾī Efendi al‐ʿĀmilī, who had tried to answer them at the beginning of
the 17th century in his work entitled al‐Ilhām al‐muqaddas min al‐fayḍ al‐aqdas (in Turkish)
(Süleymaniye Library, Reisülküttab MS 1182/4). The first question is related to the length of
daylight and night at the North Pole; the second concerns the possibility of sunrise in the west, and
whether it can be explained through astronomy or not; and the third one is about the sacred
direction to Mecca (qibla). This book's importance lies in the way it deals with science and religion
and its use of Western European ideas. This book of Dārandawī exerted a considerable influence in
Ottoman scientific circles. Following him, ʿAbd al‐ʿAzīz al‐Raḥbī (died: after 1770) examined the
second question in detail in his book entitled Kashf al‐ʿayn ʿan intibāq al‐mintaqatayn (in Arabic)
(Iraq Museum MS 12648). Aḥmad ibn Ḥusayn ibn Aḥmad al‐Gīridī (alive: 1768), translated
Dārandawī's book into Turkish under the name Ḥall‐i mushkilāt‐i arbaʿa, with revisions and some
additions, and presented it to Sultan Muṣṭafa III. Gīridī criticized the noted astronomer Taqī al‐
Dīn with respect to the second question (Süleymaniye Library, Așr Efendi MS 418/4).
In another work on timekeeping entitled Risāla fī al‐Rubʿ al‐mashhūr bi‐ʾl‐muqanṭarāt (in Arabic),
Dārandawī examined an astronomical instrument called al‐rubʿ al‐muqanṭarāt (Yusuf Ağa MS
7225/14). The book, prepared for practical use, explains how to use the instrument: to calculate
prayer times, the adjustment of which was considered necessary in Islamic civilization to attain
perfection in religious, administrative, and social life; to determine the geometrical–trigonometric
aspects of the Kaaba in Mecca; and to find the beginnings and ends of days and months, especially
the holy month of Ramadan, which has particular importance for religious practices. There are
about 30 extant copies, and their distribution indicates that it was widely used in two important
Ottoman cities, Istanbul and Cairo.
Dārandawī's most important astronomical work, for both Ottoman–Islamic and Western
astronomical history, is his Taqwīm‐i dāʾimī (in Turkish), known also as Rūznāme (Kandilli
Observatory MS 440). This calendar, designed for perpetual use, was prepared for Istanbul, the
capital city of the Ottoman State. The work can be regarded as the continuation of a tradition of
such Rūznāmes (calendars) first prepared by Muṣliḥ al‐Din Muṣṭafa ibn Aḥmad al‐Ṣadrī al‐Qunawī
(died: 1491), known as Shaykh Wafāʾ, who lived during the reigns of Sultan Muḥammad II, the
Conqueror, and Sultan Bāyazīd II. Dārandawī's tables were arranged for each degree of the solar
longitude. In the book, all the time periods of a day, such as dawn, sunrise, morning, kușluk (time
between morning and noon), noon, first and second afternoon, evening, and night, as well as the
time that the Sun is on the azimuth of Mecca, are stated in units of hour and minute for longitude
41°. On the other hand, the parameters used to determine dusk are based on the works of the two
important figures of the Islamic tradition of timekeeping: Khalīlī and Ibn al‐Shāṭir.
Albert Toderini, who visited Istanbul in 1781–1782, states that the Taqwīm was also known in
Western Europe. Toderini, noting that the Taqwīm was translated by a Russian and sent to Saint
Petersburg, says that he read that copy. According to him, the precision of the work extended its
usefulness and surpassed previous books written on the same subject. David King notes that most
extant copies of Shaykh Wafāʾs Rūznāme do not contain prayer tables; King, for example, says that
G. H. Velschii's book on Turkish and Persian almanacs, published in Latin in 1676, similarly left out
these prayer tables in the final part of the book where he presented Shaykh Wafāʾs Rūznāme.
According to King, the reason for this is that Dārandawī's Taqwīm was more meticulous and
precise. Thanks to its reputation, the Taqwīm was republished in 1787 by M. D'Ohsson in his
Tableau Général de l'Empire Ottoman.
Dārandawī has another astronomical book entitled Sharḥ‐i Rūznāme (in Turkish), which awaits
study. This is most probably the commentary of the Taqwīm (Atatürk University, SÖ, MS 18824).
Selected References
Aydüz, Salim (1997/1). “Lāle Devri'nde yapılan ilmî faaliyetler.” Dīvān İlmî Araștırmalar. 3: 143–170.
Bağdadlı, İsmail PaȘa (1955). Hadiyyat al‐ʿārifīn. Vol. 2, p. 324. Istanbul: Milli Eg‐itim Bakanlig‐i Yayinlare.
——— (1945–1947). Īḍāḥ al‐maknūn. Vol. 1, p. 406. Istanbul: Milli Eg‐itim Bakanlig‐i Yayinlare.
Brockelmann, Carl (1938). Geschichte der arabischen Litteratur. 2nd ed., suppl. 2, p. 482. Leiden: Matabaa‐i
Amire, E. J. Brill
Bursalı, Mehmed Tahir (1914–1923). Osmanlı Müellifleri. Vol. 2, p. 28. Istanbul, 1333–1342 H.
D'Ohsson, M. (1787) Tableau général de l'empire othoman. Vol. 1, p. 192. Paris.
İhsanoğlu, Ekmeleddin et al. (1997). Osmanlı Astronomi Literatürü Tarihi (OALT). (History of astronomy
literature during the Ottoman period). Vol. 1, pp. 295–296, 406–410; Vol. 2, pp. 463–465. Istanbul: IRCICA.
King, David A. (1986). “Astronomical Timekeeping in Ottoman Turkey.” In Islamic Mathematical Astronomy,
XII. London: Variorum Reprints, pp. 247, 249–250.
Toderini, Giambatista (1789). De la littérature des Turcs, translated into French from the Italian by l'abbé de
Cournand. 3 Vols., Vol. 1, p. 406. Paris. (Originally published as Letteratura turchesca. Venice, 1787.)
Velschii, Georgii Hieronymi (1676). Commentarius in Ruzname Naurus sive Tabulae aequinoctiales novi
Persarum & Turcarum anni. Augustae Vindelicorum
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