Montreal, Canada, November 1951November 1951

# Summary

On a clear night around 11 p.m. in late October or early November 1951, a man standing at the intersection of Decary Boulevard and Sherbrooke Street in Montreal saw a strange object in the sky. The witness was an amateur astronomer, which he noted gave him a trained eye for observing celestial phenomena.

The object first appeared as a green spot moving across the sky. As it approached, the witness realized it was something unusual. The green glow faded to a reddish hue, and the shape of a large disc became visible against the lit-up Montreal sky. As the object drew closer, an orange-red crescent appeared underneath it, with colors ranging from about 2,000 degrees Fahrenheit at the edges to 1,200 degrees in the center, according to the witness's temperature estimates. The object moved silently and appeared to travel at high speed despite its enormous size. For roughly 40 seconds, it passed overhead while the witness observed details of its construction and performance. The witness described it as a ring-shaped or disc-shaped craft with a central sphere and an outer ring structure.

The witness conducted detailed mathematical analysis using his observations, marking fixed points on the ground and calculating angles of sight to determine the object's size, altitude, and speed. He estimated the craft was roughly 1,000 feet in diameter and flying at approximately 1,330 feet altitude. Based on his observations and calculations, he concluded the object was an artificial spacecraft, possibly constructed by either German or Soviet engineers. A second similar object reportedly appeared briefly in the same area following a similar path.

The Air Force file evaluated this case as probably a meteor, though the witness's detailed technical analysis and his background as an amateur astronomer suggested he was attempting to document something more structured than a meteor sighting. No independent corroboration from other witnesses appears in the file, though the witness hoped a bus driver who was present at the location might be located. The full case file is reproduced below as held by the National Archives in 13 pages.