Heliometer definition

Heliometer

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WordNet

noun

(1) An instrument used to measure the angular separation of two stars that are too far apart to be included in the field of view of an ordinary telescope

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Etymology

helio-, from from + meter, from from .

Noun

An astronomical instrument, based on a telescope, for measuring the diameter of the sun; now used to measure the angular distance between stars and other celestial bodies.