Werner Landgraf
He also developed a method of eliminating systematic errors in positioning brighter comets that resulted in a more accurate prediction of the Halley's Comet. A recalculation of the path of Halley's comet to 2317 BC confirmed that the Greeks had already seen the comet on 466 B.C.
He discovered seven minor planets including 3683 Baumann, 4378 Voigt (named after Hans-Heinrich Voigt), 9938 Kretlow and 4349 Tibúrcio at ESO's La Silla Observatory in northern Chile.
Johannes Remus Quietanus
In 1607, he observed the passage of a comet, and then wrote a booklet of some fifty pages titled "Gründliche Beschreibung des neuen monstrosischen Sternes, welcher anno Christi 1607 …am hohen Himmel geleichtet", ("Accurate description of the new monstrous star that shone in the sky from July 27 to mid-October in 1607"), where he proposed an astrological interpretation of this ""sign of God"". This was actually Halley's comet that did not yet bear the current name.