U.S. Air Force Analysis of Flying Objects in the United States, 101-172

Object appeared round and probably spherical. At first looked similar to weather balloon at about 2000 ft but there was no characteristic bobbing. The wind was blowing on the ground with fair strength and gusty yet the object was quite steady. In the time it was under observation (about an hour) it traveled thru a vertical arc of about 25° or more. After watching the object for a while the observer concluded that whatever it was the thing was at great height but not a star. It had a bluish luminescence like a fluorescent lamp and as the sun set the color gradually changed to an orange color at dusk and finally snapped off like a lamp when the switch is thrown. The outline was clear and sharp and symetrical (no fuzziness or blurring), the air clear with visibility unlimited. Direction of travel from East directly toward the sun.