Danjon Scale - The Scale

The Scale

The scale is defined as follows:

L value Description
0 Very dark eclipse. Moon almost invisible, especially at greatest eclipse.
1 Dark Eclipse, gray or brownish in coloration. Details distinguishable only with difficulty.
2 Deep red or rust-colored eclipse. Very dark central shadow, while outer edge of umbra is relatively bright.
3 Brick-red eclipse. Umbral shadow usually has a bright or yellow rim.
4 Very bright copper-red or orange eclipse. Umbral shadow has a bluish, very bright rim.

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