Equant
Equant E"quant, n. [L. aequans, -antis, p. pr. of aequare: cf. F. ['e]quant. See {Equate}.] (Ptolemaic Astron.) A circle around whose circumference a planet or the center of ann epicycle was conceived to move uniformly; -- called also {eccentric equator}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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  • Equant — (or Punctum aequans ) is a mathematical concept developed by Claudius Ptolemy in the 2nd century AD to account for the observed motion of heavenly bodies.The equant point, indicated in the diagram by the • , is placed so that it is directly… …   Wikipedia

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  • equant — /ˈikwənt/ (say eekwuhnt) noun Astronomy (in the Ptolemaic system) a point from which a line is drawn to a planet, halfway along which is the centre of the planet s deferent, the planet or the centre of the planet s epicycle being conceived to… …   Australian English dictionary

  • equant — ˈēkwənt, ˌkwant adjective Etymology: Latin aequant , aequans present participle of aequare : of, being, or relating to a crystal having equal or nearly equal diameters in all directions equant grain equant habit …   Useful english dictionary

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  • equant — [ i:kwənt] noun Astronomy, historical (in the Ptolemaic system) an imaginary circle that reconciles the planetary movements with the hypothesis of uniform circular motion. Origin C16: from L. aequant , aequare make equal …   English new terms dictionary

  • eccentric equator — Equant E quant, n. [L. aequans, antis, p. pr. of aequare: cf. F. [ e]quant. See {Equate}.] (Ptolemaic Astron.) A circle around whose circumference a planet or the center of ann epicycle was conceived to move uniformly; called also {eccentric… …   The Collaborative International Dictionary of English

  • Astronomie arabe — Miniature ottomane de l étude de la lune et des étoiles XVIIe siècle Dans l’histoire de l astronomie, l’astronomie arabe renvoie aux découvertes astronomiques accomplies par la civilisation islamique, particulièrement au cours de l’Âge d or… …   Wikipédia en Français

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