spherograph

noun sphero·graph \ˈsfirəˌgraf, -fer-, -grȧf\

Definition of spherograph

  1. 1 :  two cardboards used especially in navigation and astronomy, containing various circles, and turning upon each other in such a manner that any possible spherical triangle may be readily found and the measure of the parts read off by inspection

  2. 2 :  a disk ruled with meridians and parallels in stereographic projection for the solution of problems in spherics

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Origin and Etymology of spherograph

sphaer- + -graph


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