I WAS STANDING OUTSIDE OF MY PLACE OF RESIDENCE LOOKING AT THE STARS WHEN I SPOTTED A STROBING LIGHT ROTATING IN A CIRCULAR FASHION AT A VERY HIGH ATTITUDE ON THE WESTERN HORIZON MOVING EASTWARD. I TIMED IT BY COUNTING 1 ONETHOUSAND 2 ONETHOUSAND AND SO ON TO A 6 SECOND COUNT TO CROSS THE HORIZON AT MY POINT OF VIEW.MY FIRST IMPRESSION WAS "THATS REALLY MOVING"! 2ND IMPRESSION- IT STRUCK ME AS BEING MAN MADE. BUT IT WAS HUGE EVEN AT THAT ALTITUDE AND SILENT. I DEEMED IT TO BE MAN MADE BECAUSE IT HAD WINDOWS AROUND IT WHICH WERE VISIBLE BY THE ROTATING LIGHT.I LOST SIGHT OF THE OBJECT WHEN IT CLEARED MY FIELD OF VIEW ON THE EASTERN HORIZON.