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In Jack Horkheimer's "Star Hustler" episode last week he mentioned a
luminousity scale used to rate the brightness of a lunar eclipse. I did
not catch the name (something like daw-john??), but the scale goes from
L-0 for darkest to L-4 for brightest. He quickly went through the visual
criteria used to do the rating.Would anyone have more information on
this scale or a reference?