I'm an amateur astronomer -

a neighbor & I were out in the back yard with my 6 inch reflector - we both saw it (not thru the scope) - it came from the east to the west - very low - 500 (?) feet high - moving slow - no sound at all - due to the black sky, 
we could not determine the shape of the craft - we saw three windows in the side or bottom of the craft - these windows were oval shaped & rather large & I feel that the craft was large because of the large windows - 
I was looking into the windows - the color of light inside was a light lime/green color - I was speechless - I think about it often - even after all these years - 
I've never seen anything like it before or since.  I've seen the space station, shuttle & etc come over many times - this was LOW & SLOW - and I could see windows.  Other than my wife, this is the only time I've ever told this.