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 perch swallows the grub-worm, the pickerel swallows the perch, and the fisherman swallows the pickerel; and so all the chinks in the scale of being are filled.”
—Henry David Thoreau (1817–1862)