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Hans E. LauHans-Emil Lau (April 16,1879 – October 16,1918) was a Danish astronomer. He started his observational career during his studies at the Copenhagen University. After completing his degree in 1906 he worked at the Urania, the Treptow Observatory at Berlin, and finally at Horsholm Observatory in Copenhagen. He is most famous for his work on Mars and Jupiter. Other areas he worked on were star parallax, the measuring of variable stars, the color of stars, and the observation of comets, sunspots, and the ring of Saturn. He also published speculative orbits of two trans-Neptunian planets in 1900, which were never found. A crater on Mars was named in his honor. External links Obituaries Lau, Hans Emil Lau, Hans Emil Lau, Hans Emil
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