English This image illustrates the Bortle scale, which measures the impact of light pollution on the dark skies at a given location. determination method...
English This image illustrates the Bortle scale, which measures the impact of light pollution on the dark skies at a given location. determination method:...
DescriptionHow light pollution affects the dark night skies (dark-skies) (flipped left-right).jpg English: This image illustrates the Bortle scale, which...
United States of America determination method or standard: work of the federal government of the United States determination method or standard: SHA-1...
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