CORROBORATED
CF-GEI-19981201714 CORROBORATED
The Monétay-sur-Allier Moonrise Misidentification
CASE FILE — CF-GEI-19981201714 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
1998-12-05
Location Reported location of the sighting or event
Monétay-sur-Allier, Allier, France
Duration Estimated duration of the observed phenomenon
30 seconds
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
3
Country Country where the incident took place
FR
AI Confidence AI-generated credibility score based on source reliability, detail consistency, and corroboration
85%
On December 5, 1998, at 19:45 hours, a family of three witnesses in Monétay-sur-Allier, France, observed a horizontal luminous bar of bright red color at the eastern horizon. The phenomenon appeared to consist of globes of very vivid red color and exhibited an apparent forward and backward motion toward the witnesses before disappearing suddenly after approximately 30 seconds of observation. No sound was heard during the sighting. The observation occurred under overcast sky conditions.
GEIPAN's investigation revealed precise geometric details that proved critical to resolving the case. The witnesses observed the phenomenon from their home's driveway, which measured 15 meters long by 2.5 meters wide, providing an excellent reference for determining the azimuth of approximately 65 degrees. A drawing made by the witnesses showing the object above the hedge at the end of the garden allowed investigators to estimate an elevation of approximately 4 degrees, assuming observation from the middle of the driveway. Two formal testimonies were collected during the investigation.
This case was originally classified as 'D' (unexplained) under the name SAINT-POURCAIN SUR SIOULE (03) 1998, but underwent re-examination using modern software tools and accumulated investigative experience. Using Stellarium planetarium software, GEIPAN determined that the Moon was positioned at precisely 4 degrees elevation and 66 degrees east at 19:45—exactly matching the witnesses' reported position. The witness was subsequently contacted by telephone, confirmed the exact observation position relative to the driveway and hedges, understood the misidentification mechanisms described, and accepted GEIPAN's conclusions. The case was reclassified to 'A' (positively identified) as a moonrise observation.
02 Timeline of Events
19:45
Initial Observation
Three family members observe a horizontal luminous bar of bright red color at the eastern horizon from their home's driveway. The phenomenon appears as globes of vivid red color.
19:45:15
Apparent Motion Observed
The phenomenon exhibits apparent forward and backward motion toward and away from the witnesses. No sound is heard during the observation.
19:45:30
Sudden Disappearance
After approximately 30 seconds of observation, the luminous bar disappears suddenly from view.
Post-incident
Testimony Collection
Two formal testimonies are collected by investigators, including detailed drawings showing the object's position above the hedge at the end of the garden.
Re-examination Period
Case Re-analysis
GEIPAN re-examines the case using modern software tools including Stellarium planetarium software. Geometric analysis of the 15m x 2.5m driveway and witness drawings determines azimuth of ~65° and elevation of ~4°.
Re-examination Period
Astronomical Verification
Stellarium software confirms the Moon was positioned at exactly 4° elevation and 66° east at 19:45 on December 5, 1998, precisely matching the witnesses' observation position.
Follow-up Contact
Witness Telephone Consultation
Primary witness is contacted by telephone, confirms all geometric details, and accepts the moonrise misidentification explanation. Case reclassified from D to A.
03 Key Witnesses
Anonymous Family (Primary Witness)
Civilian resident
high
Member of a three-person family who observed the phenomenon from their residential property. Provided detailed testimony including drawings that enabled precise geometric analysis. Subsequently contacted by telephone and confirmed observation details.
"The witness confirmed the exact position of observation relative to the driveway and hedges, as well as the height of the hedges at that time, and understood the misidentification mechanisms described."
Anonymous Family Members (2)
Civilian witnesses
medium
Two additional family members present during the observation who corroborated the sighting but did not provide separate detailed testimony.
04 Analyst Notes -- AI Processed
This case exemplifies exemplary scientific investigation methodology and demonstrates how initial witness perception can be thoroughly explained through rigorous analysis. The credibility of the witnesses is not in question—three family members genuinely observed something unusual. However, the convergence of multiple factors created a convincing illusion: (1) overcast conditions with evolving gaps in cloud cover driven by wind, (2) low-angle moonrise producing red coloration through atmospheric scattering, (3) moving cloud gaps creating the impression of multiple glowing globes and apparent motion toward/away from observers, and (4) the moon barely emerging above or through the cloud layer.
The investigation's strength lies in its precision: the 15-meter driveway provided an accurate azimuth reference, witness drawings enabled elevation calculations, and astronomical software provided definitive positional data showing perfect alignment. The apparent 'advance and retreat' motion is a well-documented perceptual phenomenon where varying cloud gap sizes and opacity create the illusion of distance changes for a light source of constant brightness. The witness's subsequent acceptance of this explanation after telephone consultation speaks to both the quality of the investigation and the witnesses' rationality. This case was appropriately upgraded from unexplained to explained, demonstrating GEIPAN's commitment to case review as analytical tools improve.
05 Theory Comparison
BELIEVER ANALYSIS
SKEPTIC ANALYSIS
Perceptual Illusion from Atmospheric Effects
The horizontal bar appearance and apparent motion are entirely explained by cognitive and perceptual factors. When viewing a constant-brightness light source through varying cloud opacity, the human brain interprets brightness changes as distance changes, creating the illusion of approach and retreat. The 'globes' were simply irregular cloud gaps revealing portions of the Moon's disc. The sudden disappearance occurred when cloud cover became complete. No anomalous phenomenon occurred.
06 Verdict
ANALYST VERDICT
This case is definitively explained as a misidentification of the rising Moon viewed through broken cloud cover. The astronomical position data is irrefutable—Stellarium places the Moon at 4° elevation and 66° azimuth at the exact time and location, matching the witnesses' geometric observations to within one degree. The red coloration, horizontal bar appearance, apparent motion, and sudden disappearance are all consistent with moonrise viewed through evolving cloud gaps under windy conditions. GEIPAN's reclassification from 'D' to 'A' is fully justified. This case holds value primarily as a teaching example of how atmospheric and perceptual factors can transform a familiar celestial object into something seemingly anomalous, and how precise geometric analysis combined with astronomical data can resolve ambiguous sightings.
AI CONFIDENCE SCORE:
85%
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