Trianglular mute lightened craft.craft was a triangle shape, rotation counter clockwise on it's axis at approximately 1 revolution per minute. Size was indeterminate as it was witnessed off the coast and I had no point of reference to judge size or elevation. I estimate it was 2-3 degrees + off the horizon. No noise was noted, however surf conditions are semi rough and loud therefore I cannot speak if there was noise from the craft or not.Lighting was mute, dull green on the outer area of the craft, no other point source lighting was observed. Craft was visible for a little over two minutes in a stationary manner after which it left over the horizon. Speed is hard to estimate, but the original subjective size (spacing my fingers across it's apparent width approximately .7 meters in front of my face) of the craft was approximately 100mm. It was reduced to invisible in approximately 2 seconds. I have no idea if that is significant but it seemed awful fast.