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This paper reports measurements of zenith night sky brightness and a spectral survey carried out at selected places in Venezuela and Italy. These range from large cities (Caracas and Florence) and towns (M erida and Siena), to dark sites, such as the Venezuelan Astronomical Observatory and the Alps. Measurements were carried out visually by means of a simple photometer and spectra from 4100 to 6400 A, were obtained by a small spectrograph. From the results obtained at the sites tested in Italy, the sky brightness increase since 1973 is given. Since in both countries there are eective regulations to ght light pollution, and more are foreseen in the near future, it is the purpose of this paper to stress the importance, and also the need, of night sky quality monitoring over time to assess the ecacy of these legal tools.

Visual measurements and spectral survey of night sky brightness in Venezuela and Italy