1993 in Bosnia, triangle shaped craft with dim lights, flew very low but it was completely silent.

This event occured back in 1993.  I was 14 years old.  My brother and I were walking down our street.  It was a summer night around 7 or 8 PM.  Other people were outside as well but no one else saw what we saw.  By the time we alerted everyone who was outside, the craft was already gone.  It glided over the houses at no more than 200-300 meters above.  It looked like a triangle in shape and it's color was dark. It's lights were very dim.  The craft made no noise at all.  It silently glided over the houses.  I looked up by sheer coincidence and saw it.  I alerted my brother who saw it as well.  By the time we let others know, the craft was gone.  To this day I am trying to understand what it is that we saw that night.  I was not an airplane nor a glider.  It was too low not to be heard and it was dead silent.
Witness indicates that the date of the incident is approximate.  PD