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The scale ranges from Class 1, the darkest skies available on Earth, through to Class 9, inner-city skies. It gives several criteria for each level beyond naked-eye limiting magnitude (NELM). [1] The accuracy and utility of the scale have been questioned in 2014 research. [2] [why?] The table summarizes Bortle's descriptions of the classes. For ...
This is a list of campaign settings published for role-playing games. Since role-playing games originally developed from wargames , there are many historical and alternate-history RPGs based on Earth.
John E. Bortle is an American amateur astronomer. He is best known for creating the Bortle scale to quantify the darkness of the night sky. Bortle has made a special study of comets. He has recorded thousands of observations relating to more than 300 comets. From 1977 until 1994 he authored the monthly '"Comet Digest" in Sky and Telescope magazine.
Terraria (/ t ə ˈ r ɛər i ə / ⓘ tə-RAIR-ee-ə [1]) is a 2011 action-adventure sandbox game developed by Re-Logic. The game was first released for Windows and has since been ported to other PC and console platforms.
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Others use "John Bortle's dark sky scale". Many just call it the "Bortle scale" (some with "Bortle Scale"). And some "Bortle Scale of Light Pollution". There's very little evidence that this should be treated as a proper name; it's just a scale named for a guy. Probably a better title suggestion would have been "Bortle scale", yes? Dicklyon 06: ...
The scale used to indicate magnitude originates in the Hellenistic practice of dividing stars visible to the naked eye into six magnitudes. The brightest stars in the night sky were said to be of first magnitude ( m = 1), whereas the faintest were of sixth magnitude ( m = 6), which is the limit of human visual perception (without the aid of a ...