Index of English words, starting with "he"

(1) - Heliometer (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.

(1) - Heliometric (a.) Alt. of Heliometrical

(1) - Heliometry (n.) The apart or practice of measuring the diameters of heavenly bodies, their relative distances, etc. See Heliometer.

(1) - Helioscope (n.) A telescope or instrument for viewing the sun without injury to the eyes, as through colored glasses, or with mirrors which reflect but a small portion of light.