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Discovery  :  brightness of pictures  West and  East are  not the same
  Reason ?  Eart's  Velocity  30 km/s = 30 000 000 mm/s
( Camera SEE biger/ smaller bulb INVERSE  SQUARE LAW  respect to p1,2,p3...pn)
  (NIKON 5000d  remote start,  zero outside light ,stative, manual set ,
time 10s  , F 8 , Iso 200 -  /10 cm to  bulb /  filtre is important !!!)


first  pictures
( brightness - photoshop 10 histogram) 
3 pictures west ( -30km/s ) and 3 pictures  East (+30 km/s )

http://youtu.be/O9k-zidfJZg