UFO/UAP Sighting Reports — January to December 1966

This document is a comprehensive chronological log of Unidentified Aerial Phenomena (UAP) sightings reported between January 1966 and December 1966. The log is organized by month and includes specific entries for each sighting, detailing the date, location, observer type (e.g., Military, Civilian, Multiple), and the official evaluation of the event. The evaluations are diverse, frequently attributing sightings to astronomical phenomena such as meteors, stars, or planets (e.g., Venus, Jupiter, Arcturus), as well as conventional aircraft, satellites (including Echo I, Echo II, and Pegasus II), balloons, and weather-related or psychological factors. A significant number of entries are categorized as 'Insufficient Data'. The document also includes sections for 'Additional Reported Sightings (Not Cases)', which list reports received via letters, news clippings, or phone calls that were not formally investigated as cases. Notable entries include references to the 'Michigan Flap', various radar-confirmed sightings, and reports involving photographic evidence. The log serves as a systematic record of the volume and nature of reports received by the investigating authority during this period, highlighting the routine nature of the classification process for these phenomena.