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...
Figure 1: An Armillary sphere (dhât al-halaq) located at the Istanbul Observatory founded by Taqi al-Din al-Rasid. Shahinshahnâme, Istanbul University Library, F. 1404.
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...