Bible Dictionaries
Heliometer
Webster's Dictionary
(n.) 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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Bibliography Information
Webster, Noah. Entry for 'Heliometer'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/h/heliometer.html. 1828.