Abstract
This paper presents an analysis of the systematic astronomical observations performed by Muḥyī al-Dīn al-Maghribī at the Maragha observatory between 1262 and 1274 AD. In a treatise entitled Talkhīṣ al-majisṭī, preserved in a unique copy at Leiden, Universiteitsbibliotheek, Muḥyī al-Dīn explains his observations and measurements of the Sun, the Moon, the superior planets, and eight reference stars. His measurements of the meridian altitudes of the Sun, the superior planets, and the eight bright stars were made using the mural quadrant of the observatory, and the times of their meridian transit using a water clock. The mean absolute error in the meridian altitudes of the Sun is ~ 3.1′, of the superior planets ~ 4.6′, and of the eight fixed stars ~ 6.2′. The clepsydras used by Muḥyī al-Dīn could apparently fix time intervals with a precision of ± 5 min. His estimation of the magnitudes of three lunar eclipses observed in Maragha in 1262, 1270, and 1274 AD is in close agreement with modern data.
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DOI 10.1007/s00407-018-0217-z
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References found in this work BETA

An Analysis of Medieval Solar Theories.S. Mozaffari - 2018 - Archive for History of Exact Sciences 72 (2):191-243.
The Arabic Version of Ptolemy's Planetary Hypotheses.G. J. Toomer & Bernard R. Goldstein - 1970 - Journal of the American Oriental Society 90 (2):296.
Solar and Lunar Observations at Istanbul in the 1570s.John M. Steele & S. Mohammad Mozaffari - 2015 - Archive for History of Exact Sciences 69 (4):343-362.

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Citations of this work BETA

Ibn Al-Fahhād and the Great Conjunction of 1166 AD.S. Mohammad Mozaffari - 2019 - Archive for History of Exact Sciences 73 (5):517-549.

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