Abstract
ABSTRACT A. A. HOAG, W .E.SCHOEMNG,ANI)M.COUCKE Kitt Peak National Observatoryt Photographs of night sky have been taken from Kitt Peak on clear moonless nights to provide a record of changes in contamination from artificial lights. Quantitative measures confirm the obvious qualitative impression that city sky-glow brightuess is increasing as is the case at most existing observatory sites. Key words: city lights - artificial sky glow
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