1. Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 1

2. The Netherlands Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 2

3. Sky Brightness Network: Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 3 1 2 3 4 5 6 7 8 9

4. Sky Brightness Network - Urban Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 4 1 2 3 4 5 6 7 8 9

5. Sky Brightness Network - Rural Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 5 1 2 3 4 5 6 7 8 9

6. Sky Brightness Network - Nature Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 6 1 2 3 4 5 6 7 8 9

7. Sky Brightness Network - Instrumentation Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 7 1 2 3 4 5 6 7 8 9

8. Sky Brightness Network - locations Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 8 1 2 3 4 5 6 7 8 9

9. Sky Brightness Network - locations Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 9 1 2 3 4 5 6 7 8 9

10. Sky Brightness Network - calibration Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 10 1 2 3 4 5 6 7 8 9

11. Sky Brightness Network - calibration Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 11 1 2 3 4 5 6 7 8 9

12. Sky Brightness Network - calibration Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 12 1 2 3 4 5 6 7 8 9

13. Sky Brightness Network - calibration Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 13 1 2 3 4 5 6 7 8 9

14. Sky Brightness Network - uptime Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 14 1 2 3 4 5 6 7 8 9

15. Sky Brightness Network - measurements Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 15 1 2 3 4 5 6 7 8 9

16. Sky Brightness Network - measurements Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 16 1 2 3 4 5 6 7 8 9

17. Sky Brightness Network - measurements Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 17 1 2 3 4 5 6 7 8 9

18. Sky Brightness Network - measurements Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 18 1 2 3 4 5 6 7 8 9

19. Sky Brightness Network - measurements Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 19 1 2 3 4 5 6 7 8 9

20. Sky Brightness Network - measurements Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 20 1 2 3 4 5 6 7 8 9

21. Sky Brightness Network - measurements Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 21 1 2 3 4 5 6 7 8 9

22. Sky Brightness Network - measurements Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 22 1 2 3 4 5 6 7 8 9

23. Sky Brightness Network - measurements Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 23 1 2 3 4 5 6 7 8 9

24. Sky Brightness Network - measurements Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 24 1 2 3 4 5 6 7 8 9

25. Sky Brightness Network - measurements Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 25 1 2 3 4 5 6 7 8 9

26. Sky Brightness Network - Results Two years Night Sky Brightness measurements in The Netherlands | Pamplona 13-09-2013 26 1 2 3 4 5 6 7 8 9 Night Sky Brightness and variability behave as expected: low at remote areas and high in cities and industrial areas. Human behaviour results in lowest luminances during first hours of a new day. Implementation of legislation on light emissions yields clear signals in the monitoring data. A simple power law is established between luminance levels under clear sky and solid overcast. Long-term monitoring can improve sky brightness modeling.