Template:Are You Sure/January 19

• ... that astronomer Jacobus Kapteyn studied the proper motions of stars, reporting in 1904 that these were not random, as it was believed in that time; stars could be divided into two streams, moving in nearly opposite directions; and that it was later realized that Kapteyn's data had been the first evidence of the rotation of our Galaxy, which ultimately led to the finding of galactic rotation by Bertil Lindblad and Jan Oort?

• ... that Dee Ring, the home-repair superspy played by Patrick McGoohan in the television series D-Ring: Agent of Suspense, also appears in a crossover episode of Secret Reagent Man starring McGoohan and Johnny Rivers?