The first one I saw was in the summer of 1946 in city of Dillingen, a/D, on river Danube.An hour or so after dark I was walking home.
Not sure what made me look up, maybe the objects movement, it was not moving fast but was absolutely quiet.
A very large circular shape. the color red like hot glowing iron, sliding thru the sky above the roofs of 2 story buildings on that street.
Shortly it flew behind the roofs of the buildings disappearing from my view.