The Boulay-Moselle Moon Misidentification

On February 4, 1979, at approximately 1:15 AM, a lone witness driving near Boulay-Moselle, in the Moselle department of France, observed what appeared to be a luminous orange half-sphere in the sky for approximately 30 seconds. The witness described the object as moving in a horizontal trajectory from southwest to northeast before gradually diminishing and disappearing. The object's striking orange color and unusual semi-spherical shape prompted an official report to authorities, with gendarmerie documentation including topographical details of the observation site. Initially classified as Category C by GEIPAN (France's official UFO investigation agency under CNES) due to insufficient information, this case remained unresolved for decades. In a remarkable demonstration of citizen science, an amateur astronomer and internet user recognized the description as potentially matching the moon at moonset. To verify this hypothesis, this investigator returned to the exact location in February 2015—36 years after the original sighting—to conduct a precise astronomical reconstruction using the Saros cycle (a period of 223 lunar months or 6,585.32 days used to predict eclipses). The reconstruction was meticulously planned around two dates in February 2015 when lunar position would most closely match the 1979 observation: February 23 at 23:55 (moon at 1.1° elevation, 288° azimuth) and February 25 at 1:00 AM (moon at 1.5° elevation, 292° azimuth). The original 1979 observation had the moon at 1.4° elevation and 286° azimuth—nearly identical conditions. The investigator's detailed report confirmed the moon's appearance as an orange-red half-sphere at a nearly horizontal inclination, matching the witness testimony precisely. Crucially, the topography of the observation site features a 6% grade where elevation rises 16 meters over 250 meters, creating an optical illusion where objects on the horizon appear to suddenly "emerge" as a vehicle crests the hill. This geographical peculiarity, combined with the moon's low position and unusual coloration at moonset, fully explained the witness's perception of an anomalous moving object.