Definition of Heliomiter
He`li*om"e*ter (?), 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.
- Webster's Unabridged Dictionary (1913)
- 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
- The Nuttall Encyclopedia
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