Yellow Springs, Ohio Spinning Disc (1968)

The sighting

In the early hours of 15 August 1968, a civilian reported an object over the village of Yellow Springs, in Greene County, southwest of Dayton. The declassified Project Blue Book record reproduced on UFOScans gives the time as 00:30 and describes a disc-shaped object that was yellow, gold and white and was spinning. The observer put it at about 300 feet above her car. She also reported a groaning sound and a smell she compared to World War II German aircraft. The conditions were misty and foggy, and the sighting lasted about 30 minutes.

The records do not agree on the number of witnesses. One UFOScans page describes a single civilian observer. A second page lists three named witnesses, though two of the names are partly illegible. Both pages carry machine-generated summaries, so the sensory details should be checked against the original Blue Book forms before being treated as settled.

Blue Book evaluation

Project Blue Book's scientific consultant, the astronomer J. Allen Hynek, investigated. According to the second record, Hynek initially classed the case as "unidentified". The first record says he "initially suggested it could be unidentified or plasma". Donald Menzel of the Harvard College Observatory, a prominent skeptic, objected. The record quotes him: "In my honest opinion, there is absolutely no reason to keep this sighting on the list of unknowns."

The official assessment was that the object was "probably the moon, with autokinesis involved". The category was recorded as "Astro (Moon)". The explanation given was atmospheric conditions, combined with psychological factors and the apparent-motion illusion known as autokinesis. The records do not say clearly whether the Moon label replaced Hynek's "unidentified" entry or was simply recorded alongside it, so the sequence of classification remains unresolved here.

Context and aftermath

The case arrived during the final phase of Blue Book. The Air Force had funded the University of Colorado study under Edward Condon from 1966. Its report was delivered in November 1968 and released in January 1969, and it concluded that "nothing has come from the study of UFOs in the past 21 years that has added to scientific knowledge". Hynek was among the critics who argued that the report left many cases unexplained. The Air Force closed Blue Book on 17 December 1969. Brad Sparks argues that its last activity was on 30 January 1970.

Neither the Condon Committee article nor the Project Blue Book article on Wikipedia mentions the Yellow Springs case, so its importance rests on the declassified records rather than on the broader literature.

Assessment

Yellow Springs is an ordinary single-witness night report, distinguished mainly by the disagreement inside Blue Book over how to label it. The official outcome was a lunar explanation. Menzel's sharp rejection of an "unknown" label and Hynek's first decision to leave the case open show the two men's contrasting standards at work in a case that was otherwise thin on evidence.

The credibility is rated contested. The Air Force classification is documented, but the account rests on one or three witnesses, the record summaries disagree on details, and no physical trace or photograph exists. The Moon explanation is the official finding, but the case remains a useful example of how Blue Book handled ambiguous reports. The main open questions are whether Hynek's original classification was formally changed and how many witnesses the original file contains. Those answers would require the original scanned forms, which were not accessible for this entry.