Hypertext Webster Gateway: "heliometer"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Heliometer \He`li*om"e*ter\, n. [Helio- + -meter: cf. F.
h['e]liom[`e]tre.] (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.
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