(n) 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
The Collaborative International Dictionary of English (GCIDE) v.0.53
n. [ Helio- + -meter: cf. F. héliomètre. ] (Astron.) 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.
n. [ Photo- + heliometer. ] (Astron.) A double-lens instrument for measuring slight variations of the sun's diameter by photography, utilizing the common chord of two overlapping images. [ Webster 1913 Suppl. ]
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