CORROBORATED
CF-GEI-20180350512 CORROBORATED
The Marseille Venus Misidentification Case
CASE FILE — CF-GEI-20180350512 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
2018-03-31
Location Reported location of the sighting or event
Marseille, Bouches-du-Rhône, France
Duration Estimated duration of the observed phenomenon
11 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
1
Country Country where the incident took place
FR
AI Confidence AI-generated credibility score based on source reliability, detail consistency, and corroboration
85%
On March 31, 2018, between 21:30 and 21:41 local time, a single witness observing from their 4th-floor balcony in Marseille reported seeing a bright luminous sphere displaying varied colors following a slow descending trajectory. The object appeared to descend gradually before disappearing behind the Notre Dame de la Garde hill. The witness described the phenomenon as "like a star falling slowly from the sky, in slow motion" and was convinced the object could not be Venus because they believed the planet would be hidden behind the hill.
GEIPAN's official investigation conducted a detailed astronomical and topographical analysis of the sighting. Astronomers determined that Venus was indeed visible at 283° azimuth, positioned slightly to the left of Notre Dame de la Garde (290°) and to the right of the star Rigel (237°), exactly matching the witness's description. During the 10-minute observation period, Venus descended from 2° to 0.5° elevation above the horizon, creating the perceptible slow descending motion described by the witness.
The investigation included a detailed reconstruction of the sightline from the witness's position. Analysis revealed that the highest obstacle in Venus's direction was approximately 60 meters higher than the building's base, or about 50 meters above the witness's 4th-floor position. Located 3,900 meters away, this obstacle created an elevation angle of 0.7°. Since Venus was at 2° elevation at the start of the observation, it was clearly visible above the obstacle. After 10 minutes, Venus naturally descended to 0.5° elevation, appearing to disappear behind the horizon as expected. The multicolored appearance was consistent with atmospheric refraction effects on celestial objects near the horizon.
02 Timeline of Events
21:30
Observation Begins
Witness from 4th-floor balcony notices bright luminous sphere with varied colors. Venus at 2° elevation, 283° azimuth, visible above terrain obstacles.
21:30-21:41
Slow Descending Motion Observed
Witness observes object following slow descending trajectory over 11 minutes. Venus naturally descends from 2° to 0.5° elevation, creating perceived slow falling motion.
21:41
Object Disappears Behind Hill
Luminous sphere disappears slowly behind Notre Dame de la Garde hill. Venus descends to 0.5° elevation, below the 0.7° terrain obstacle angle, setting behind horizon.
Post-observation
Witness Reports Sighting
Witness files report with GEIPAN, convinced the object could not be Venus due to belief it was blocked by Notre Dame de la Garde hill.
Investigation phase
GEIPAN Conducts Analysis
Investigators perform astronomical calculations and topographical reconstruction, determining Venus was visible at 283° azimut with unobstructed sightline from witness position.
Conclusion
Case Classified A
GEIPAN issues Class A classification (identified with certainty) confirming observation was planet Venus with atmospheric color effects.
03 Key Witnesses
Anonymous Witness 1
Civilian resident
medium
Marseille resident observing from 4th-floor balcony, honest reporter who provided detailed description
"L'analogie la plus descriptive est comme si une étoile tombait lentement du ciel, au ralenti (The most descriptive analogy is like a star falling slowly from the sky, in slow motion)"
04 Analyst Notes -- AI Processed
This case represents an exemplary astronomical misidentification with textbook characteristics. The witness's honest and detailed description, particularly the phrase about a star falling "in slow motion," actually provides the key evidence for the correct explanation. The witness's certainty that Venus was blocked by Notre Dame de la Garde demonstrates a common cognitive bias where observers discount astronomical explanations based on incorrect assumptions about terrain and sightlines.
GEIPAN's investigation is thorough and demonstrates professional methodology: precise astronomical calculations confirming Venus's position (283° azimuth), elevation tracking (2° to 0.5° over 10 minutes), correlation with reference stars (Rigel at 237°), and detailed topographical analysis including the exact height and distance of terrain obstacles (60m high, 3,900m distant, creating 0.7° elevation angle). The changing colors reported by the witness are perfectly consistent with atmospheric scintillation effects when viewing bright celestial objects low on the horizon. The investigation's reconstruction definitively proves the witness had an unobstructed view of Venus throughout most of the observation period.
05 Theory Comparison
BELIEVER ANALYSIS
SKEPTIC ANALYSIS
Cognitive Bias and Terrain Misjudgment
This case demonstrates classic cognitive biases in UFO reporting. The witness was certain Venus was blocked by Notre Dame de la Garde, leading them to exclude the correct explanation and file a report. Human visual perception is notoriously unreliable for judging elevations, distances, and sightlines without instruments. The witness's own description—'like a star falling slowly'—actually points directly to the astronomical explanation they rejected. This illustrates why eyewitness certainty does not equal accuracy, and why scientific investigation with precise measurements is essential.
06 Verdict
ANALYST VERDICT
This case is definitively explained as a misidentification of the planet Venus. GEIPAN's Class A classification (identified with certainty) is fully justified by the convergence of multiple confirming factors: precise astronomical position data, topographical analysis, timing correlation, and the witness's own description perfectly matching Venus's behavior near the horizon. The witness's misconception about terrain obstruction highlights why professional investigation is essential—human spatial judgment can be unreliable without precise measurements. This case has zero significance as an unexplained phenomenon but serves valuable educational purposes, demonstrating how even careful observers can misinterpret familiar astronomical objects under specific viewing conditions.
AI CONFIDENCE SCORE:
85%
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