James Evans, 1998 , The History and Practice of Ancient Astronomy, page 47, Oxford University Press• Pingree: "History of Mathematical Astronomy in India", Dictionary of Scientific Biography, Vol | Whitegishm MT, USA: Kessinger Publishing |
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: Encyclopaedia of Islam, THREE, Brill 2010, without page numbers• : Encyclopaedia of Islam, THREE, Brill 2010, without page numbers• Lenn Evan Goodman 1992 , Avicenna, p | Direct adoption of the Greek concept by Islam: Ragep, F |
Direct adoption by India: D.
17"A History of Ancient Mathematical Astronomy" | Measuring the Universe: Cosmic Dimensions from Aristarchus to Halley |
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, Livesey, Steven John, Wallis, Faith eds | Hugh Thurston, Early Astronomy, New York: Springer-Verlag , p |
"A History of Ancient Mathematical Astronomy".
241 "On the mensuration of the Earth and its division into seven climes, as related by Ptolemy and others," ff | Magellan's Voyage around the World |
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