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.
Historical comet observations in China
Chinese observations of Halley's Comet are of especial importance to astronomers because of the important place this comet had in their growing understanding of them. The earliest confirmed sighting was in 240 BC (in the "Records of the Grand Historian")—with a continuous record after 164 BC. A comet observed in 467 BC may have been Halley, but there is insufficient information to be sure. The most accurate records of Halley begin in 12 BC.