出典:Wikipedia
出典:『Wikipedia』 (2011/07/11 16:03 UTC 版)
The Danjon Scale of lunar eclipse brightness is a five-point scale useful for measuring the appearance and luminosity of the Moon during a lunar eclipse. It was proposed by André-Louis Danjon when he was measuring the Earthshine on the Moon. An eclipse's rating on the Danjon Scale is denoted by the letter L.