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Danjon scale


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A scale for roughly estimating the darkness of a total lunar eclipse, originated by A. Danjon. The five-point scale runs from 0 (extremely dark, Moon invisible) to 4 (extremely bright, eclipse having little effect on Moon's visibility). The darkness of a lunar eclipse is largely determined by the opacity of the Earth's atmosphere, which is affected by clouds and volcanic dust.

Subjects: Astronomy and Astrophysics.


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