Large dial-like object seen over San Francisco in 1952

Summary

In August 1952, a civilian woman observed a large dial-like object over San Francisco. The report, though incomplete, describes the object as clearly visible at an estimated altitude between 10,000 and 20,000 feet, moving at a speed of 210 knots. The observer reported no human activity or physical evidence, and no conventional aircraft were identified in the area. The report was classified by U.S. Air Force intelligence, indicating no conventional explanation was found for the phenomenon.

The document, part of a system for unidentified flying object reports, was distributed to several military bases and intelligence centers. Despite the lack of complete details, the case remains intriguing due to the clear description of the object and the absence of a conventional explanation. This type of report reflects the concern of authorities during the Cold War era over any unexplained aerial phenomena.