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  1. The Determination of the Longitude of the Apogee of the Orbit of the Sun according to Hipparchus and Ptolemy.Viggo M. Petersen & Olaf Schmidt - 1968 - Centaurus 12 (2):73-96.
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  • Ancient Stellar Observations Timocharis, Aristyllus, Hipparchus, Ptolemy?; the Dates and Accuracies.Y. Maeyama - 1984 - Centaurus 27 (3):280-310.
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  • Ibn Y?nus' very useful tables for reckoning time by the sun.David A. King - 1973 - Archive for History of Exact Sciences 10 (3-5):342-394.
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  • Two Medieval Approaches to the Equation of Time.E. S. Kennedy - 1988 - Centaurus 31 (1):1-8.
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  • The Exact Sciences in Antiquity.Arnold Dresden - 1953 - Journal of the American Oriental Society 73 (1):53.
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  • A Statistical Method for Recovering Unknown Parameters from Medieval Astronomical Tables.Benno Dalen - 1989 - Centaurus 32 (2):85-145.
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  • Ptolemy's Determination of the Obliquity of the Ecliptic.John P. Britton - 1969 - Centaurus 14 (1):29-41.
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