Abstract
The most noteworthy action by this Commission is the issue in 1980 of “Guidelines for minimizing Urban Sky Glow near Astronomical Observatories” (Cayrel and Smith, 1980). This is a joint publication of IAU and CIE (Commission Internationale de l’Eclairage). It represents a practical approach to the most serious problem facing all observatories: the increase of light pollution from urban areas. Taking the previous recommendations of Commission 50 into account, the report shows how natural and artificial sky glow affects astronomical observations, describes methods of avoiding excessive artificial sky glow, and shows how public regulations have been successfully applied to protect individual observatories.
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