4th Dark-Sky European Symposium, Paris, September 24-25, 2004
December                                                                                                                                              April
February                                                                                                                                                May
September                                                                                                                                             March
    December                                                                                                                                              April
January                                                                                                                                                 May
     September                                                                                                                                             February                                                  
nThe colored bars on the left side of the pictures gives the light pollution level according to the Cinzano & al. atlas of night sky brightness.
nThe light pollution level perceived on the field remains about the same all year long for similar meteorological conditions (clear sky…). There is an asymptotic light pollution level that can not be gone through.
n
Sensibility to the time of the year