sphero·​graph | \ˈsfirəˌgraf, -fer-, -grȧf\

Definition of spherograph 

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

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History and Etymology for spherograph

sphaer- + -graph

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the figure or shape of a crescent moon

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