Published online by Cambridge University Press: 13 May 2016
Sky glow was measured in the Netherlands in 1992 and in 1997. The 1992 measurements were photographic surveys, assessed in the Netherlands and in Japan, whereas the 1997 measurements were limit-star assessments. In all cases, the number of measurements was very small. The three sets of data are compared. The sky glow differs considerably over the country and during the night; there are no systematic differences between the results for different epochs and assessment methods. For measurements that allow conclusions that can be used in national policy making, the samples must be very much larger.