André Danjon


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Frenchastronomer. From 1921 he built a variety of special photometers for studying lunar eclipses (for which he established the Danjon scale) and variable stars, and calculated the first really accurate values for the albedos of the Moon, Venus, and Mercury. He improved the design of the prismatic astrolabe for measuring star positions (see Danjon Astrolabe).

Subjects: Astronomy and Astrophysics.

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