While watching a lunar eclipse from Cape Neddick, Maine, on 12 April 1968, a household group reported a domed, oval object with red blinking lights and a bright pulsating white light. The Air Force considered an aircraft carrying an illuminated advertising sign. It contacted an operator, who denied that his plane could have been responsible. The surviving investigation consequently supports a possible explanation, with the attempted identification and its limits both visible.
Watching the eclipse
The principal witness’s letter is dated 19 April 1968 and describes going outside shortly after 11 p.m. on the 12th to watch the approaching total eclipse. The sky was said to be cloudless. The writer and a relative were looking towards the Moon when they noticed an object below it, initially moving east before appearing to turn towards the north-northeast.
The original Blue Book card records the local date as 12 April and the corresponding universal time as 04:15 on 13 April. These refer to the same late-evening observation, rather than two different nights. Fred Espenak’s NASA eclipse catalogue independently lists a total lunar eclipse on 13 April 1968, visible from the Americas. That confirms the astronomical context, not the identity of the reported object.
The witness said an initial version of the account had been written within twelve hours of the event. The surviving typed letter was sent later. This distinction preserves the writer’s claim about prompt recording without representing the dated document itself as a letter dispatched immediately after the observation. The writer also said the account was being sent to NICAP, the civilian UFO organisation.
Shape, colour and lights
The letter describes a flat oval with a dome and compares a cluster of red blinking lights to the band around a hat. A particularly bright white light appeared near the front or central upper portion. The whole form was said to have a dull red-orange glow. The witness deliberately looked for the red-and-green lighting associated with ordinary aircraft but reported seeing nothing green.
These details describe an observer’s interpretation of appearance under night conditions. They do not establish a measured solid outline or an unconventional vehicle. Equally, replacing the account with a generic report of a single moving star would lose what the witness actually described. The form, clustered lights and pulsation were central to the reason the report was submitted.
No sound or trail was reported. The object remained in view for less than a minute in the letter; the administrative card summarises approximately one minute. The writer did not claim expertise in estimating distance and only said it seemed lower than the usual passage of jet aircraft. That comparison cannot be converted into a reliable altitude, physical size or speed.
More than one viewing position
The letter describes two people outside and another person inside the house who reportedly glimpsed the object as it passed below the Moon. This is not three equally detailed independent accounts of the whole flight. The indoor glimpse had a narrower duration and viewpoint. The case file includes follow-up questionnaires, but the clearest continuous description remains the typed narrative.
The witnesses expressly requested anonymity. Their names and residential details are omitted here, and the map uses a broad locality reference. The report concerns observation from private property in the Cape Neddick area; the presence of well-known coastal visitor attractions nearby does not identify one of those attractions as the observation site.
The Air Force requests more information
An Air Force response dated 23 April asked for a completed questionnaire so technical staff could investigate further. The file preserves forms and additional correspondence. Those documents distinguish the initial report from the evaluation that followed. The early reply did not identify an object; it stated that additional information was required before an explanation could be offered.
The office subsequently approached police departments along the direction in which the object was said to travel. It also explored a specific kind of conventional aircraft: an advertising plane equipped with an electrical sign. This was more concrete than merely suggesting that any night light could be an aeroplane. The investigators tried to connect the reported appearance with an operator whose equipment might create it.
The advertising-plane inquiry
A May inquiry describes the white light and numerous red lights and asks whether the operator’s plane might have supplied the stimulus. The commercial reply, dated 20 May 1968, says the operator checked his records and that the season’s first flight using the night equipment had been on 14 May. He therefore rejected his aircraft as the source of an observation on 12 April.
That response is a material negative result in the attempted identification. It cannot fairly be omitted from an account calling the case solved by an advertising aeroplane. The actual letter also corrects an OCR ambiguity: the first-flight date reads 14 May in the scanned document, not 16 May. Neither date should be confused with the April incident.
The denial concerns that operator’s aircraft. It does not independently exclude every other aircraft or establish that the reported dome was a solid unusual structure. The surviving file supplies no positively matched registration, pilot account or flight record linking a particular aircraft to the observers’ location and time. An appearance-based explanation remained an explanation to consider, rather than a completed identification.
The police checks
The Air Force reasoned that continued north-northeasterly travel could have taken the stimulus towards Biddeford and Saco. Replies from their police departments reported no corresponding record or knowledge of an unusual-object report. These were checks for additional reports, not tracking observations establishing where the original object went.
The summary also referred to nearby airfields and argued that an aircraft remained plausible. It noted that people were outside watching the eclipse yet no further reports had been received. That was the evaluators’ reasoning. Absence of a report in the checked police records cannot demonstrate that nobody elsewhere saw anything, and it does not furnish a continuous flight path.
The card ends with a possible-aircraft classification. Its continuation, filed elsewhere in the scan sequence, retains that conditional wording. The record therefore contains both a conventional proposal and an unsuccessful inquiry into one candidate. It should not be upgraded to a confirmed aircraft simply because an official file uses an explanatory category.
Assessment
Outcome: Possibly Explained. An aircraft, including an illuminated advertising plane, was the Air Force’s proposed explanation for the arrangement of lights and movement. The contacted operator ruled out his own plane, and the surviving checks did not positively match another flight. The explanation remains possible; the file does not establish an extraordinary craft either.
The most useful evidence is specific: a dated witness letter, an approximately one-minute observation, a described lighting arrangement, a commercial records check and police replies. Their limitations are also specific. There is no photograph, physical specimen, measured range or demonstrated route between towns. Retaining those distinctions allows the reader to assess the case without turning either the testimony or the hypothesis into more than the sources support.
Location and sources
Location note: The pin is a rounded Cape Neddick locality reference from the U.S. Census Gazetteer. It does not mark the private yard, a particular coastal attraction or a measured aerial position. The observation locality is in Maine; offices and businesses contacted during the investigation were elsewhere.
Released Project Blue Book file: summary card at PDF page 1 and continuation at page 12; police correspondence at pages 18–19; operator’s reply at page 20; the advertising-aircraft inquiry at page 21; witness narrative at page 22 and initial Air Force response at page 23. Relevant original text was read, with the principal dates, description, candidate denial and classification checked against page images.
NASA lunar-eclipse catalogue, 1961–1970 supplies the independent eclipse context. Eclipse predictions are by Fred Espenak, NASA’s GSFC. The catalogue’s technical time scale is not substituted for the time written in the witness report. Sources, image rights and metadata checked 13 November 2026.