Around 9:45 (approximate time)we were looking at the stars, as we often do, when I noticed an unknown to me bird-like formation in V-shape, six in total, with one in the middle, something that looked like six aircrafts. At first I thought they were birds, it was approaching closer fast and when it was overhead it was obvious they were not birds, they had short wings and kind of like diamant shape, but more triangular and were glowing with dull light (like when you hold a white paper in front of a lightbulb), the formation had flown with no sound at all, they were relatively low, they had short wings and no other lights other than the overall glow. they were visible for about 7-9 seconds, flying overhead, from approximately north-east to south-west, at the end of their visibility, when they were going further away, the whole formation together gave of overall glow around them. I have never seen anything like that before.