50 ft. sphear over farm house moved off exces of mach1 visible untill fading out of sight.

I was driving with my mother "unfortunatld now deceased"going east on the road just south of the wabash rivver when we came around to see a sphear aproximatly 50 foot in diamiter about 1/4 mile ahead of us setting stationary above a farm house about 15 to 20 feet over the chinmey it was glowing orange apeared to be perfectly smooth and was giving off enough light to iluminate the house and outline of the barn. At that point my mother said look at that moon and I said that is no moon however it was the clasic color of the rising harvest moon.At that point it started moving south and up at about 30 degrees. It made no sound and excelerated at a tremendous rate in a strate line turning continuously lighter in color untill it apeared to be no more than a star that continued in the same direction untill it was to far and faint to see.This took no more than 20 seconds from the time that it started to move. I am rather certin on the size as it's dianiter was as close as i was able to toll the same as the top of the roof.I have been in the military and it was not a plane or conventional air craft.it made no manoover other than a strate line it made no sound although it had obviously exceaded the sound barier several times.I now work in electronics and know of no way of doing this. It was a solid object below the high tree line it had no markings or visible openings. it was not a reflection and when we aproched it was aparent that it was centered above the house that is still standing. and to the bottom was not over 45 feet off the ground.
Date may be approximate, although the witness does not indicate that fact.  PD