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Biruni’s Telescopic-Shape Instrument for Observing the Lunar Crescent

by S. Mohammad Mozaffari, Georg Zotti Published on: 17th October 2020

This paper deals with an optical aid named barbakh that Abū al-Rayḥān al-Bīrūnī (973–1048 CE) proposes for facilitating the observation of the lunar crescent in his al-Qānūn al-Mas‘ūdī VIII.14. The device consists of a long…

Mathematical Science – Contributions of Islamic Scholars to the Scientific Enterprise

by Yasmeen Mahnaz Faruqi Published on: 2nd September 2025

The mathematical sciences of the Islamic world flourished between the 8th and 13th centuries, building on Greek, Indian, Babylonian, and Persian traditions while introducing groundbreaking innovations of their own. Muslim scholars refined arithmetic with the…