Vibrant yellow lights forming perfect triangleDriving east, we saw 3 vibrant yellow lights forming a triangle. We have lived within close proximity to an airport for over 25+ years and are very familiar with planes ascending and descending regularly. We know the color lights, the sounds and the approximate height of planes within our town. My first initial reaction was-why are those 3 plane flying so closely together? And then it was brought to my attention that they weren't planes & that's when I noticed the color of the lights, the shape & the distance. The night was clear with no visible clouds. Minimal stars were observed.