Figure 1: Taqī al-Dīn's observational clock is shown in the right hand side middle of this famous picture of Istanbul observatiry. Source: Istanbul University Library, MS F1404, folio 57a.
The Astronomical Clock of Taqi Al-Din: Virtual ReconstructionLEARN MORE
In his book The Brightest Stars for the Construction of Mechanical Clocks (Al-Kawakib al-durriyya fi wadh' al...
Figure 1a: Armillary sphere (dhât al-halaq) of Taqî al-Dîn. Source: Istanbul Topkapi Library, Hazine 452, f. 89 .
The Instruments of Istanbul ObservatoryLEARN MORE
In this article, Professor Sevim Tekeli, an outstanding scholar in the history of Ottoman science, describes...
The Observation WellLEARN MORE
Observation wells received much historical interest relating to observatories. In this article Prof. Aydin...
Figure 1: The trigonometric functions of an angle q can be constructed geometrically in terms of a unit circle centered at O.
Taqi al Din Ibn Ma’ruf 's Work on Extracting the Cord 2[sup]o[/sup] and Sin 1[sup]o[/sup]LEARN MORE
This article by Professor Sevim Tekeli, a leading historian of science in the Ottoman period, deals with an...
Figure 1: The determination of the prayer times according to the positions of the sun.
Principle and Use of Ottoman SundialsLEARN MORE
Muslim astronomers and engineers invented a variety of dials for timekeeping and for determining the times of...