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Light pollution
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=== Satellite imagery measuring === To precisely measure how bright the sky gets, night time satellite imagery of the earth is used as raw input for the number and intensity of light sources. These are put into a physical model<ref name="Cinzano-2001">{{cite journal |url = http://debora.pd.astro.it/cinzano/download/0108052.pdf |title = The first world atlas of the artificial night sky brightness |journal = Mon. Not. R. Astron. Soc. |volume = 328 |date = 2001 |pages = 689β707 |doi = 10.1046/j.1365-8711.2001.04882.x |issue = 3 |arxiv = astro-ph/0108052 |bibcode = 2001MNRAS.328..689C |archive-url = https://web.archive.org/web/20060819051651/http://debora.pd.astro.it/cinzano/download/0108052.pdf |archive-date = 2006-08-19 |last1 = Cinzano |first1 = P. |last2 = Falchi |first2 = F. |last3 = Elvidge |first3 = C. D. |last4 = Baugh |first4 = K. E. |doi-access = free |s2cid = 15365532 }}</ref> of scattering due to air molecules and aerosoles to calculate cumulative sky brightness. Maps that show the enhanced sky brightness have been prepared for the entire world.<ref>{{in lang|it}} [http://www.lightpollution.it/worldatlas/pages/fig1.htm The World Atlas of the Artificial Night Sky Brightness] {{Webarchive|url=https://web.archive.org/web/20100923212042/http://www.lightpollution.it/worldatlas/pages/fig1.htm |date=2010-09-23 }}. Lightpollution.it. Retrieved 2011-12-03.</ref>
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