near Gotha, Germany: Unknown object — May 1764
Single object, seen passing in front of the sun by Mr. Hoffmann. It was a large round spot
of about one fifteenth the diameter of the Sun, crossing it slowly north to south.
Source: “Observations of the transits of intra-mercurial planets or other bodies across the Sun’s disk,” The Observatory 29 (1879): 135. Case: W306