Concentric spheres

Concentric spheres

The cosmological model of concentric or homocentric spheres, developed by Eudoxus, Callippus, and Aristotle, employed celestial spheres all of which had the same center, the Earth.[1][2] In this respect it differed from the epicyclic and eccentric models with multiple centers, which were used by Ptolemy and other mathematical astronomers until the time of Copernicus.

Notes

  1. ^ Neugebauer, Otto (1975), A History of Ancient Mathematical Astronomy, 2, Berlin / Heidelberg / New York: Springer-Verlag, pp. 677–85, ISBN 0-387-06995-X 
  2. ^ Lloyd, G. E. R. (1999) [1996], "Heavenly aberrations: Aristotle the amateur astronomer", Aristotelian Explorations, Cambridge: Cambridge University Press, pp. 167–8, ISBN 0-521-55619-8 

Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Concentric — circles An archery target, featuring evenly spaced …   Wikipedia

  • concentric — Having a common center, such that two or more spheres, circles, or segments of circles are within one another. * * * con·cen·tric kən sen trik, ( )kän adj having a common center <concentric circles> con·cen·tri·cal·ly tri k(ə )lē adv * * *… …   Medical dictionary

  • spheres — n. pl. [Gr. sphaira, ball] 1. Any globular body. 2. (PORIFERA) Rounded bodies in which growth is concentric around a center …   Dictionary of invertebrate zoology

  • concentric — concentrically, adv. concentricity /kon seuhn tris i tee, sen /, n. /keuhn sen trik/, adj. having a common center, as circles or spheres. Also, concentrical. [1350 1400; ME consentrik < ML concentricus. See CON , CENTER, IC] * * * …   Universalium

  • concentric — con·cen·tric || kÉ’n sentrɪk adj. having a common center or axis (of circles, spheres, etc.) …   English contemporary dictionary

  • concentric — con•cen•tric [[t]kənˈsɛn trɪk[/t]] adj. math. (esp. of circles or spheres) having a common center • Etymology: 1350–1400; ME < ML concentricus con•cen′tri•cal•ly, adv. con•cen•tric•i•ty ˌkɒn sənˈtrɪs ɪ ti, sɛn n …   From formal English to slang

  • concentric — /kənˈsɛntrɪk / (say kuhn sentrik) adjective having a common centre, as circles or spheres. Also, concentrical. –concentrically, adverb –concentricity /kɒnsənˈtrɪsəti/ (say konsuhn trisuhtee), noun …  

  • Celestial spheres — Not to be confused with celestial sphere. For other uses, see Celestial (disambiguation). Geocentric celestial spheres; Peter Apian s Cosmographia (Antwerp, 1539) …   Wikipedia

  • Dyson spheres in fiction — This is a listing of the use of the Dyson sphere concept in popular fiction. For a discussion of the general concept and its history, see the main article.In science fiction some additional fictional technologies are described to enhance… …   Wikipedia

  • Klerksdorp Spheres — The Klerksdorp Spheres are small, often spherical to disc shaped, objects, which have been collected by miners and rockhounds from 3.0 billion year old pyrophyllite deposits mined by Wonderstone Ltd., near Ottosdal, South Africa. These objects… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”