The Growth of the Artificial Night Sky Brightness over North America in the Period 1947–2000: a Preliminary Picture

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The growth curve of the average artificial night sky brightness in the period 1947–2000 at a sample of sites in North America was obtained from published measurements of the V band night sky brightness. Results show the fast exponential growth of the artificial night sky brightness in North America due to light pollution. A larger dataset will be necessary to better constrain the average growth rates and to understand the average growth curve in detail.