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...
Figure 1: Dr Geoffrey Roper (Source).
Muslim Printing Before GutenbergLEARN MORE
Gutenberg in the 15th century. Based on his work on original sources, he states that some of the early...
Figure 1: View of primary and secondary rainbows (Source).
Kamal Al-Din Al-Farisi’s Explanation of the RainbowLEARN MORE
This article focuses on a critical presentation of the arguments put forward by Kamal al-Din al-Farisi about...