Halley, the astronomer who discovered Halley's comet,
could recall two accounts involving unidentified crafts.
His first experience was in March of 1676, when he saw
a, as he said, "Vast body apparently bigger than
the moon." He estimated it at 40 miles. above
him. He also stated that it made a noise, "Like
the rattling of a great cart over stones." After
estimating the distance it traveled in a matter of minutes,
he came to the conclusion that it moved at a speed greater
than 9,600 m.p.h.