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 Moonshine on the Earth. An eclipse's rating on the Danjon Scale is denoted by the letter L.
Read more about Danjon Scale: The Scale, Determining The Value of L, Factors Affecting The Value of L
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“The poet is the person in whom these powers are in balance, the man without impediment, who sees and handles that which others dream of, traverses the whole scale of experience, and is representative of man, in virtue of being the largest power to receive and to impart.”
—Ralph Waldo Emerson (1803–1882)