Three points of white light moving in a trianglular formation.Sighting occured at home on a mostly clear night, little cloud. Three points of white, steady light in the sky, moving together. About star brightness. Lights made a near isoceles triangle in shape. Approx 20, 75, and 85 degree corners with the acute angle leading the formation. Heading due east. First saw the lights directly overhead in the constellation of Cassiopeia. They did not outline a solid object because stars passed behind the line of the lights and remained visible. Lights moved slowly, like a high altitude jet. Distance between the front light and the rear lights was about three thumbnails at arms legnth. Distance between the two tail lights was about one thumbnail at arms length. Lost sight of the lights behind a cloud bank just before they passed the Seven Sisters star cluster. Lights did not appear to emerge on the other side of the cloud bank. The line of flight was can be illustrated by drawing a line between the mid point star in Cassiopeia and the Seven Sisters cluster. Sighting lasted one and a half to two minutes. Have not been able to ascertain if there was any air traffic overhead as of yet. Noise from the highway and residential area prevented me from hearing anything other than that. Very similar to two previous sightings of the same nature I have experienced, and reported, but not to this organization.