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Using the SNPP-VIIRS/DNB and the DMSP-OLS it is possible to have an idea ofthe evolution of the light pollution until the LEDs started to appearmassively. Another of the issues of dealing with these two datasets is thedifferent time of acquisition. In general this means that countries get dimmerlate at night, although that is not always true. A counterexample of this isthe country of the Netherlands because of the opening of the shutters late atnight. Other countries have a much bigger drop late at night because of somepractices like the total or partial turn off of public and private lighting butalso dimming policies. Examples of this are countries like France, Austria andthe UK.

Importance of the time acquisition difference between DMSP/OLS and SNPP/VIIRS/DNB and the RAW trends in Europe