Two small bright points of blueish white light spotted hovering motionless in NW sky at approximately 35 degrees above horizon. Initially thought to have been stars, assumed to have been at extremely high altitude. Objects then began moving very slowly SE in trailing tandem formation for approximately 15-20 seconds, first object then receded from view over 1-2 seconds as if in accelerating ascent. Second object appeared to perform same "maneuver" 1-2 seconds later.