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Danjon scale : ウィキペディア英語版 | Danjon scale
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 in 1921, when postulating that the brightness of a lunar eclipse was related to the solar cycle. An eclipse's rating on the Danjon Scale is traditionally denoted by the letter L. ==The scale==
The scale is defined as follows:
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Danjon scale」の詳細全文を読む
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