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==== Measuring light pollution ==== ----Light pollution is quantified by a special system called the Bortle Scale. The Bortle Scale is a 9 point scale measuring the brightness of the sky at Zenith (90 degrees up.) Each of the 9 levels of the scale are assigned a color. White, red, light red, orange, yellow, green, blue, grey, and black. These “zones” are projected onto services like Google Earth to create a light pollution map. White zones correspond to a Bortle scale of 8-9. These zones are found in heavily populated areas like cities and large suburbs. Black zones are rare and are usually found in the middle of deserts or oceans. ----
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