I was sitting in the backyard having a smoke sometime close to midnight when I saw 5 dim lights which formed the outline of a v or triangle pass directly overhead, possible 50-100 metres above. Lights travelled at a high rate of speed in a straight line, maybe 100-200 km/hour. Was visible for only maybe 5 seconds or more before "object" vanished from sight. I was observing the stars so was looking in a generally upward direction at that moment.At first I thought perhaps the 5 lights were birds flying in formation but after a quick second I realized that:a) There was absolutely no sound emanating from the "object".b) Velocity was far too rapid for birds.c) Birds don't fly at night (do they.My reaction was fairly calm. I found the event to be fascinating but no cause for alarm.