Date of sighting: December 19, 2013
Location of sighting: Andover, Massachusettes, USA
Thursday 12/19/13 Left work at approximately 5:54 pm, came out of building which faces towards the river (North). Sky was clear, could see stars, no precipitation, it was dark.
Immediately noticed four lights traveling across the sky, from the North heading East or SouthEast, and gaining altitude. The first 3 lights were in a triangle formation and the 4th light traveled behind the triangle. There was no noise. All 4 lights kept the same distance from each other. (I see military jets taking off a mile from the airport and these lights were travelling at perhaps a slower speed, and perhaps just a bit lesser altitude gain.) I took a couple of still pictures (17:54:47 & 17:55:01) and then a video at 17:54:48. One of the still shots shows a light, and the video shows the 4 lights (triangle and trailing light). Could not make out any object, only could see the lights.