Never seen before 'lights' in the sky by a avid sky watcher. Lights suddenly disappeared.3 'stars' in a perfect triangle pattern. Very bright and never before seen by the witness, who gazes at the stars each night. The lights were stationary. All of a sudden, they dimmed and disappeared. Witness stood for 15 minutes watching the area of the sky. Sky was clear with no clouds. They did not reappear.