Instruments

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FEATURED ARTICLES

Ibn Yunus and The Pendulum: A History of Errors
In this article, Professor David A. King explores the authenticity of the statement that tenth-century Egyptian astronomer Ibn Yūnus was the first person to use a pendulum to measure time. After...
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Principle and Use of Ottoman Sundials
Muslim astronomers and engineers invented a variety of dials for timekeeping and for determining the times of the five daily prayers. In this thorough and technical study, Professor Attila Bir...
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