perfect semi-circle band of clouds on eastern maui over oceanI was sitting in the back yard having coffee. Looking east over the ocean,I saw a perfect semi-circle on the horizon. Along the circumference was a band of white that looked like clouds. The inside of the semi-circle was clear, because I could see stars. I could not see stars through the white band. Estimated it was about 15 miles out. The base diameter approx.2 miles, radius 1 mile,thickness of white band 1/10th of radius. The top was about 20 degrees above the horizon. As time went on the semi circle expanded proportionally until it dissipated at about 75-80 degrees above the horizon. I did not see any type of craft or hear any noise. It was very likely associated with the sighting on the road to Haleakala crater at about the same time.