spherograph

noun

sphero·​graph

ˈsfirəˌgraf,

-fer-,

-grȧf

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

Word History

Etymology

sphaer- + -graph

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