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heliometer

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noun he·li·om·e·ter \ˌhē-lē-ˈä-mə-tər\

Definition of heliometer

  1. :  a visual telescope that has a divided objective designed for measuring the apparent diameter of the sun but also used for measuring angles between celestial bodies or between points on the moon

heliometric play \ˌhē-lē-ō-ˈme-trik\ adjective
heliometrically play \-tri-k(ə-)lē\ adverb


Origin of heliometer

French héliomètre, from hélio- 1heli- + -mètre -meter


First Known Use: 1753


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