A black triangular craft with white lights at the vertices flew across the Northern Minnesota sky headead southwest.I was sitting in my camp chair in an area northeast of the city of Detroit Lakes. I was in an isolated area with very little light pollution. The night was very clear and I could see every star in the big dipper constellation, a testament to the clarity of the skies. I was looking Northward when from the right side of my vision (The East), a black, triangular craft with one bright white light, about magnitude 2.0, at each one of the three vertices of the triangle. The craft flew westward with a slight southern turn, it was completely silent throughout the duration of the flight. I observed it fly across the entire sky, from my point of view the object seemed to be two hundred feet long at least. I have taken several astronomy classes and have a background in the physical sciences. I am very skeptical by nature, I am however, unable to explain this event.