Bonn, Germany: Dark unknown body — 11 June 1855
A dark body was seen crossing the disk of the sun. It was reported by astronomers Ritter
and Schmidt.
Source: E. Ledger, “Observations or supposed observations of the transits of intraMercurial planets or other bodies across the Sun’s disk,” Observatory 3 (1879-80): 135-8, at 137. 459. Case: W412