CORROBORATED
CF-GEI-19820100915 CORROBORATED
The Hombourg-Haut Moon Misidentification
CASE FILE — CF-GEI-19820100915 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
1982-01-27
Location Reported location of the sighting or event
Guenviller, Moselle, France
Duration Estimated duration of the observed phenomenon
2 minutes
Object Type Classification of the observed object based on witness descriptions
light
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%
On January 27, 1982, at approximately 19:15 (7:15 PM), an entire family traveling by car on departmental road CD 910 in the commune of Guenviller, Moselle, France observed what they described as a peculiar illuminated object in the cloudy sky. The observation lasted approximately two minutes. The witnesses described a silent, slowly-moving luminous object shaped like a half-sphere or dome that emitted light. The object appeared to move relative to their vehicle's position, shifting from right to left of the road as they drove. Two family members returned to the location around 19:30 (7:30 PM) but the object had vanished.
GEIPAN investigators conducted a thorough astronomical analysis of the sighting conditions. Cartographic reconstruction showed the witnesses' travel route and observation direction, which remained consistently along the road axis with slight variations, corresponding to an azimuth between 242° and 244°. Astronomical verification for Nancy at 19:15 revealed that the Moon was positioned at exactly azimuth 244° with an elevation of 4.5°, appearing as a thin inclined crescent. The low elevation and partial cloud cover masked portions of the Moon, creating the illusion of a half-sphere or cigar shape.
The case provides an excellent example of astronomical misidentification. GEIPAN's investigation conclusively demonstrated that the witnesses observed the setting Moon under conditions that obscured its true nature: low altitude positioning, partial cloud obstruction, and the witnesses' failure to recognize the celestial body while moving in their vehicle. The object's apparent movement corresponded perfectly with the vehicle's motion, and its disappearance coincided with the Moon's continued setting and/or additional cloud passage. This case was initially classified as "D" (unidentified) but was reclassified to "A" (fully explained) after thorough astronomical analysis.
02 Timeline of Events
19:15
Initial Observation Begins
Family in vehicle on CD 910 road near Guenviller observes illuminated half-sphere shaped object in cloudy sky. Object appears to move silently and slowly.
19:15-19:17
Object Tracks with Vehicle
During two-minute observation, object appears to shift from right to left of road relative to vehicle movement. Object seems to stop when vehicle stops.
19:17
Observation Ends
Object disappears from view as family continues journey. Total observation duration: approximately 2 minutes.
19:30
Return Visit
Two family members return to observation location seeking the object. It is no longer visible, consistent with continued lunar setting and/or cloud coverage.
Post-incident
GEIPAN Investigation
GEIPAN conducts cartographic reconstruction and astronomical analysis. Moon position verified at azimuth 244°, elevation 4.5°, matching observation direction precisely.
Post-incident
Reclassification
Case initially classified as 'D' (unidentified) but reclassified to 'A' (astronomical misidentification) after conclusive analysis.
03 Key Witnesses
Anonymous Family (4 members)
Civilian motorists
medium
Family traveling together on CD 910 departmental road in Moselle region. Two members returned to observation site seeking the object.
"The object emitted light and moved slowly without making any sound. It was shaped like a half-sphere."
04 Analyst Notes -- AI Processed
This case demonstrates exceptional investigative methodology by GEIPAN, showcasing how systematic astronomical cross-referencing can definitively resolve seemingly mysterious sightings. The key evidence points are compelling: (1) the observation azimuth of 242-244° precisely matches the Moon's position at 244° azimuth; (2) the witnesses never mentioned seeing the Moon despite it being directly in their field of view; (3) the object's behavior—appearing to stop when the car stopped, shifting position relative to the road—is classic parallax effect consistent with observing a distant celestial body while in motion; (4) the thin crescent Moon at low elevation (4.5°) combined with low cloud cover would naturally appear as an unusual half-sphere or dome shape.
The witness credibility appears genuine—they reported what they honestly perceived, and their detailed observations (silent movement, light emission, shape, duration) are all consistent with a misidentified astronomical object under poor viewing conditions. The fact that two witnesses returned to the location seeking the object demonstrates sincere interest and rules out deliberate fabrication. This case serves as an important reference for understanding how atmospheric conditions, observer motion, and low-altitude celestial positioning can create convincing UFO reports from mundane astronomical phenomena. The reclassification from "D" to "A" also illustrates GEIPAN's commitment to thorough reinvestigation and scientific rigor.
05 Theory Comparison
BELIEVER ANALYSIS
SKEPTIC ANALYSIS
Atmospheric Optical Phenomenon
Even without accepting the lunar explanation, the described characteristics—silent movement, slow drift, luminosity, apparent correlation with vehicle motion—are all consistent with misperception of a distant light source (whether celestial or terrestrial) viewed through atmospheric conditions. The 'stopping when vehicle stops' behavior is classic parallax misinterpretation by witnesses observing from a moving vehicle.
06 Verdict
ANALYST VERDICT
This case is definitively explained as a misidentification of the setting Moon. The astronomical data is irrefutable: the Moon's position matches the observed object's location with precision, and all witness descriptions align perfectly with viewing a low-elevation lunar crescent through partial cloud cover while in motion. The witnesses' failure to recognize the Moon is understandable given the unusual viewing conditions—4.5° elevation places it very close to the horizon where atmospheric distortion and clouds significantly alter appearance. The case holds educational value as a textbook example of astronomical misidentification and demonstrates why witness perception alone, however sincere, cannot determine the nature of aerial phenomena without corroborating scientific analysis. Confidence level: 100% explained.
AI CONFIDENCE SCORE:
85%
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