Triangular shape moved in the sky from my right to my left very quickly, and seemed to have appeared from mid-air.Standing on my balcony at approximately 21:15, I was smoking my cigarette and looked up at the stars. I thought immediately about how vulnerable the earth must be in space and had a feeling like something could hit it at any time and was a bit frightened by the thought.Just as this thought dissipated, I saw what appeared to be a slightly illuminated triangular shape very close to the same color as the sky, and three bulb like objects located at the outward ends of each of the triangular points of the shape. The bulb like objects were either not lit at all or were very dim, but something was glowing, whether it was an illuminated track on the inner frame of the shape, or just the outline of the shape itself was luminescent.Also, it seemed to have appeared from nowhere, which startled me, and it moved so quickly from the far right all the way past me to the left that I could tell it was not moving in the way that an aircraft would move, nor did it make a single sound at all.There were no blinking or moving lights.The shape was about five or six hundred yards away.It was moving at what I could estimate at about 60 miles per hour.It continued moving away over the tree tops and apartment complexes to my left and disappeared.I am very frightened because this is not my first initial sighting. I had a much more intimate sighting close to the year 1997 at a Caldors in Waterford, Connecticut. I was with my Mother and sister at that time.