Al‐Qūhī (or Al‐Kūhī)

  • Yvonne Dold‐Samplonius
Reference work entry
DOI: https://doi.org/10.1007/978-1-4020-4425-0_9325

Abū Sahl Wayjan ibn Rustam al‐Qūhī (or al‐Kūhī) probably originated from the village of Quh in the Iranian province of Tabaristan. He worked in Baghdad under the Buwayhid Caliphs ˓Aḍud al‐Dawla and his son and successor Sharaf al‐Dawla. In 969/970 al‐Qūhī assisted at the observations of the solstices in Shiraz. These observations, ordered by ˓Aḍud al‐Dawla, were directed by Abū'l‐ḥusayn ˓Abd al‐Raḥmān ibn ˓Umar al‐Ṣūfī. In 988 al‐Qūhī supervised astronomical observations in the garden of the palace of Sharaf al‐Dawla in Baghdad in the company of several magistrates and respected scientists.

Some of al‐Qūhī's contemporaries considered him to be the best geometer of his time; al‐Khayyāmī held him in high esteem. In the geometrical writings known to us he mainly solved problems that would have led to equations of higher than the second degree. A note by al‐Qūhī is added to Naṣīr al‐Dīn al‐Ṭūsī's redaction of Archimedes' Sphere and Cylinderin the Leiden manuscript, on how to construct a...

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References

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© Springer-Verlag Berlin Heidelberg New York 2008

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  • Yvonne Dold‐Samplonius

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