LIGHT POLLUTION at Southern Stars Observatory
Since March 2007 , the City of FAAA has installed Street Light in the road in the North :N.West of SSO , the pollution is caused by 5 standard lamps and one is just  in front of the observatory . the lamp  are Sodium high Pressure

Spectrum



 
Street Light in front of my observatory (North) ( roll of roof in the edge)




NEWS , SINCE MAY 2008 , A MASK ( BLACK PAINT) was put on this Street ligh and light pollution
was discrease ( a little) ( photo follows)



       
a second street light on the North/west
              

My observatory , image taken from west side   




                                            

Sperctrum Sodium Hight pressure                  Spectrum Sodium low pressure

Sodium low pressure is easier to  filter than High Pressure Sodium