Witnessed a triangular object pulsating with red lights in an irregular way.

While in my bathroom I noticed red lights approx 1,000 feet above the tree line going across my backyard in a type of irregular flight path. The object did not emit any sound and slowly followed this course thru the tree line then zipped away. I went outside to see if was going to return and it did not. The object was triangular shaped being it was not an airplane or jet flying sideways as I would have heard the sound of an engine roar (Note: we often have military jets flying overhead weekly doing drills from Fort Gordon and you can always hear them) I have witnessed this phenom before when living up in Northern Westchester NY and Northern CT as well.