"Black Triangle" spotted in CT back in mid-eighties

I was a teenager walking home from a convenience store job.  I remember how clear the night was and no moon.  Stars were bright that night so I was looking up at them.  I noticed first a green light, then the white light and red light in the shape of an enormous triangle slowly moving across the sky with no sound.  Stars were completely blocked out of the sky within the traingle.  Since it just looked like a shadow it's difficult to tell the altitude but it seemed very low. There was nothing very unique about the lights, like any small plane, but the size of the triangle was astoundingly huge.  Like standing under a wedge shaped umbrella. I never knew my experience was somewhat common until I read a news story today about "black triangles."  These have been around a while. I'm glad I could finally validate what I saw back then, I never forgot it.  I don't know what it was doing in New Haven but Sikorsky Helicopter is near here.