Celestial sphere (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Celestial sphere" in English language version.

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Chauvenet, William (1900). A Manual of Spherical and Practical Astronomy. J.B. Lippincott Co., Philadelphia. chauvenet spherical astronomy., p. 19, at Google books.
Newcomb, Simon (1906). A Compendium of Spherical Astronomy. Macmillan Co., New York., p. 90, at Google books.
Arthur Berry (1898) A Short History of Astronomy, page 38
Seares, Frederick H. (1909). Practical Astronomy for Engineers. E.W. Stephens Publishing Company, Columbia, MO. Bibcode:1909pafe.book.....S. practical astronomy., art. 2, p. 5, at Google books.

Newcomb, Simon; Holden, Edward S. (1890). Astronomy. Henry Holt and Co., New York., p. 14
Lloyd, Geoffrey Ernest Richard (1970). Early Greek Science: Thales to Aristotle. New York, NY: W. W. Norton & Co. p. 84. ISBN 978-0-393-00583-7.

Mendell, Henry (16 September 2009). "Eudoxus of Cnidus: Astronomy and Homocentric Spheres". Vignettes of Ancient Mathematics. Archived from the original on 16 May 2011.

Seares, Frederick H. (1909). Practical Astronomy for Engineers. E.W. Stephens Publishing Company, Columbia, MO. Bibcode:1909pafe.book.....S. practical astronomy., art. 2, p. 5, at Google books.

Mendell, Henry (16 September 2009). "Eudoxus of Cnidus: Astronomy and Homocentric Spheres". Vignettes of Ancient Mathematics. Archived from the original on 16 May 2011.