heliometer

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

Definition of heliometer 

: 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

Other words from heliometer

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

First Known Use of heliometer

1753, in the meaning defined above

History and Etymology for heliometer

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

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The first known use of heliometer was in 1753

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