Fixed formation of about one hundred bright spots in the night skyMe and my girlfriend was on vacation in Budapest, Hungary this week. We had rented an old, pretty nice, apartment very close to the parliament building of Hungary. We both had trouble sleeping, so we went out on the balcony just before midnight for a smoke. Suddenly I spot what I first believe is a flock of birds flying gently through the night sky. I keep looking at these strange birds and wonder how come they glow. The sky is pitch dark, so the only way for them to be seen is if something is shining on them from below. The flock slowly move through the sky, and they keep the same glow all the time.Within a second it suddenly comes to me that this cannot be birds. There are about a hundred spots in the sky, in a fixed, stretched (not even) formation. Fortunately there were a lot of sky outside our balcony (there was a park, so no walls hid the sight). I kept looking at the formation for about 5 minutes, before they no longer were in my visible area.Two spots came a little later. The last of them seemed to consist of two bright spots, rotation very closely to each other.The fixed formation and the quantity of the spots makes me really confused. I have absolutely NO idea what this might have been. I remember thinking that it looked like a slice of the night sky was moving (it looked like stars).They made no sound that I could hear at all.