Light on a straight path over Calvados without conclusive explanation

Summary

In May 2008, a witness near La Graverie in Calvados saw a light moving in a straight line from southwest to northeast at about 30 degrees above the horizon. The description is brief and lacks detail. A flying lantern was suggested, but recorded wind conditions did not support that trajectory. Insufficient meteorological data and limited details about the phenomenon led GEIPAN to classify the case as C, with no conclusive explanation.