Photoheliometer

Photoheliometer

Pho`to*he`li*om"e*ter\, 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's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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