Photoheliometer

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 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

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