Heliometer
[hee-lee-om-i-ter] /ˌhi liˈɒm ɪ tər/
noun
1.
a telescope with a divided, adjustable objective, formerly used to measure small angular distances, as those between celestial bodies.
/ˌhiːlɪˈɒmɪtə/
noun
1.
a refracting telescope having a split objective lens that is used to determine very small angular distances between celestial bodies
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