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1. (n.) heliometer
a telescope with a divided, adjustable objective, formerly used to measure small angular distances, as those between celestial bodies.
Etymology: (1745–55)
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Webster Dictionary |
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1. (noun) heliometer
an instrument devised originally for measuring the diameter of the sun; now employed for delicate measurements of the distance and relative direction of two stars too far apart to be easily measured in the field of view of an ordinary telescope
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Definitions of heliometer 
