Model map of the night sky glow in Poland

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[Credit: Ściężor T. Light pollution of the night sky in Cracow Agglomeration. Data analysis of the artificial sky glow measurements (in Polish), Kraków 2010, on the base of the map: P. Cinzano, F. Falchi (University of Padova), C. D. Elvidge (NOAA National Geophysical Data Center, Boulder). Copyright Royal Astronomical Society. Reproduced from the Monthly Notices of the RAS by permission of Blackwell Science.]