CORROBORATED
CF-GEI-19800200740 CORROBORATED
The Les Sables d'Olonne Moonset Misidentification
CASE FILE — CF-GEI-19800200740 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
1980-02-24
Location Reported location of the sighting or event
Les Sables d'Olonne, Vendée, France
Duration Estimated duration of the observed phenomenon
10 minutes
Object Type Classification of the observed object based on witness descriptions
sphere
Source Origin database or archive this case was sourced from
geipan
Witnesses Number of known witnesses who reported the event
4
Country Country where the incident took place
FR
AI Confidence AI-generated credibility score based on source reliability, detail consistency, and corroboration
85%
In the early morning hours of February 24, 1980, multiple witnesses in Les Sables d'Olonne, France, reported observing a large orange spherical object appearing to descend into the Atlantic Ocean. At approximately 3:15 AM, a group of young people spotted an orange glow through pine trees near the beach. Moving to obtain a better view toward Île d'Yeu, they observed what they described as a very large, three-quarters spherical object, orange in color and without brightness or shine. The object appeared to move vertically at a slow, constant speed. The observation lasted approximately ten minutes and concluded when the object appeared to slowly sink into the ocean, leaving a whitish glow. No sound was heard during the entire encounter.
Earlier that same morning at approximately 3:05 AM, a gendarme (French police officer) on patrol independently observed a similar phenomenon. He described a hemispherical object, larger than a quarter moon, red-orange in color without brightness. Like the later witnesses, he reported the object descending slowly and vertically without changing shape or color. The consistency between these independent observations initially suggested a genuine anomalous aerial phenomenon.
GEIPAN's official investigation conclusively determined that all witnesses had observed an astronomical event: the setting moon. The investigation established that the moon set at exactly 3:12 AM that morning. Furthermore, the moon was in its first quarter phase, which explained the half-disc appearance observed by witnesses, with the curved portion facing downward. The orange coloration and apparent large size were consistent with atmospheric refraction effects typical of celestial bodies near the horizon. This case received GEIPAN's 'A' classification, indicating a phenomenon with certain identification.
02 Timeline of Events
03:05
First Observation by Gendarme
Police officer on patrol observes hemispherical red-orange object, larger than a quarter moon, descending slowly and vertically without changing shape or color
03:12
Astronomical Moonset
Official calculated time of moonset. Moon in first quarter phase, appearing as half-disc with curved portion facing downward due to phase geometry
03:15
Second Observation by Civilian Group
Group of young people spot orange glow through pine trees near beach. Moving for better visibility toward Île d'Yeu, they observe three-quarters spherical orange object without brightness
03:15-03:25
Continued Observation and 'Ocean Entry'
Object observed descending vertically at slow, constant speed for approximately 10 minutes. Observation concludes when object appears to slowly sink into ocean, leaving whitish glow. No sound heard throughout
Post-incident
GEIPAN Investigation and Classification
Official investigation by GEIPAN (French space agency's UAP division) determines all witnesses observed the setting moon. Case classified as 'A' - identified with certainty
03 Key Witnesses
Anonymous Gendarme
Police officer on patrol
high
French gendarme conducting routine patrol in Les Sables d'Olonne area during early morning hours
"Un objet demi sphérique, plus gros qu'un quartier de lune, de couleur rouge-orangé sans brillance. Cet objet se déplace lentement et descend verticalement sans changer de forme ou de couleur."
Anonymous Witness Group
Civilian witnesses (young people)
medium
Group of young people near the beach in Les Sables d'Olonne who initially spotted the phenomenon through pine trees
"Un très gros objet en direction de l'île d'yeu qui est au trois-quart sphérique, de couleur orangé et sans brillance... L'objet s'est enfoncé lentement dans l'océan laissant apparaître une lueur blanchâtre."
04 Analyst Notes -- AI Processed
This case represents a textbook example of how atmospheric conditions and observer psychology can transform familiar celestial objects into seemingly anomalous phenomena. Several factors contributed to the misidentification. First, the observation occurred during early morning hours (3:05-3:15 AM) when witnesses may have been tired and less critical in their assessment. Second, the coastal location with pine trees partially obscuring the view initially prevented immediate recognition of the moon. Third, the low horizon position of the setting moon would have maximized atmospheric refraction effects, creating the distinctive orange coloration and apparent magnification that witnesses described.
The credibility of witnesses is actually enhanced by the presence of a trained gendarme among the observers, making this case particularly instructive. Even experienced observers can be deceived by atmospheric optical effects when encountering them in unexpected contexts. The independent nature of the two observation groups (the gendarme at 3:05 AM and the young people at 3:15 AM) initially appeared to corroborate an anomalous event, but ultimately served to confirm the astronomical explanation. The precise timing correlation with the calculated moonset at 3:12 AM provides definitive confirmation. The 'sinking into the ocean' described by witnesses perfectly matches the visual effect of a celestial body setting below the maritime horizon.
05 Theory Comparison
BELIEVER ANALYSIS
SKEPTIC ANALYSIS
Observer Expectation and Atmospheric Optics
Multiple psychological and environmental factors contributed to misidentification: early morning hours affecting alertness, initial obscuration by pine trees preventing immediate recognition, coastal maritime atmosphere enhancing refraction effects, and observer expectations. The independent witnesses actually strengthen the astronomical explanation rather than suggesting anomalous phenomena, as both groups observed the same celestial event from slightly different times and locations.
06 Verdict
ANALYST VERDICT
This case is definitively explained as a misidentification of the setting moon, confirmed by GEIPAN's Class A classification. The investigation demonstrated perfect correspondence between witness descriptions and the known astronomical event: moonset occurred at precisely 3:12 AM, directly between the two observation times (3:05 and 3:15 AM). The moon's first quarter phase explains the hemispherical appearance, while atmospheric refraction accounts for the orange coloration and apparent large size. The 'vertical descent' was the natural setting motion, and the 'sinking into the ocean' was the moon disappearing below the horizon. While this case holds minimal value as a genuine UAP event, it serves significant educational purpose in demonstrating how atmospheric optics and observer expectations can transform mundane astronomical phenomena into seemingly extraordinary events. The case exemplifies why rigorous scientific investigation is essential in UFO research and validates GEIPAN's systematic approach to case classification.
AI CONFIDENCE SCORE:
85%
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