Gustav Carl Friedrich Müller [n 1 ] (born 1865 in Germany - date of death unknown; in Rotterdam, Netherlands) was a German bigamist, murderer and self-confessed serial killer.
In 1886, he began a collaboration with Paul Kempf to assemble the Potsdam Durchmusterung, which was a stellar catalogue of all stars in the northern hemisphere with a magnitude of 7.5 or brighter. [2 ] In 1897 he published the manual Die…