Artificial Night Sky Brightness in the British Isles.
This map shows the amount of light pollution present in atmosphere from wasted light (light that is travelling upwards and lighting up atmospheric molecules and particles).
Source of image: Dark Skies For NI website who took it from the Light Pollution Science and Technology Institute . P. Cinzano (Dipartimento di Astronomia, Università di Padova), F. Falchi (Dipartimento di Astronomia, Università di Padova), C.D. Elvidge (NOAA National Geophysical Data Center, Boulder), Baugh K. (NOAA National Geophysical Data Center, Boulder), Monthly Notices of the Royal Astronomical Society, 318, 641-657 (2000)
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