A mass sighting of celestial phenomena or unidentified flying objects (UFO) occurred in 1561 above Nuremberg (then a Free Imperial City of the Holy Roman Empire). Ufologists have speculated that these phenomena may have been extraterrestrial spacecraft. Skeptics assert that the phenomenon was likely to have been another atmospheric phenomena, such as a sun dog,[1] although the print doesn't fit the usual classic description of the phenomena.[2][3]