Project 10073 Record: Incident #23 - Boise, Idaho - 30 June 1947

This document contains a Project 10073 record regarding a sighting incident that occurred on June 30, 1947, in Boise, Idaho. A civilian observer reported seeing a stationary, bright, silvery, half-circle object that appeared to be clinging to a cloud. The observer, who claimed to have had aircraft recognition training, was confident the object was not an airplane. The sighting lasted for a few minutes at an estimated altitude of 3,000 feet. The report includes a formal evaluation by the Air Materiel Command, which suggests that the sighting was likely a sun-cloud effect. The investigator reasoned that the position of the sun at the time of the observation could have illuminated a background cloud, creating the visual phenomenon described by the witness, despite reports of an otherwise clear sky. The document also includes administrative correspondence from January 1949, originating from the Headquarters of the Air Materiel Command at Wright-Patterson Air Force Base, addressed to the Chief of the Air Weather Service. This correspondence discusses the collection and investigation of data related to unidentified flying objects under Project SIGN and mentions the forwarding of incident summaries 1 through 172. Additionally, the document contains an incident index extracted from a Project GRUDGE report, which categorizes various sightings based on the probability of astronomical or other explanations.