We were sitting on the 8th floor balcony around 9pm looking over the city of st petersburg towards the south. we noticed what i first thought was a satellite appear directly over head and steadily heading south. there were no flashing lights typical of a satellite and the object was moving quickly. it suddenly began to veer to the east and very rapidly made a right turn and accelerated to the west and appeared to gain significant altitude and speed before fading away in the sky. we were left excited and confused by what we just saw!