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Johann Daniel Titius
Johann Daniel Titius born Johann Daniel Tietz(e) (January 2, 1729 – December 11, 1796) was a German astronomer and a professor at Wittenberg.〔(sächsische Biografie ) 〕
Titius was born in Konitz, Royal Prussia to Jakob Tietz, a merchant and council member from Konitz, and Maria Dorothea, neé Hanow. His original name was Johann Tietz, but as was customary in the 18th century, when he became a university professor, he Latinized his surname to Titius. Tietz attended school in Danzig (Gdańsk) and studied at the University of Leipzig (1749-1752). He died in Wittenberg, Electorate of Saxony.〔
== Astronomy ==
He is best known for formulating the Titius–Bode law, and for using this rule to predict the existence of a celestial object at 2.8 AU from the sun. This happened in 1766, when he inserted his observation on planetary distances into a German translation of Charles Bonnet's book ''Contemplation de la Nature''. His suggestion that the object would necessarily be small was later superseded by the claim of Johann Elert Bode for a planet-like object, subsequently identified as being Ceres. In part because of the Titius-Bode law, the first four minor planets were at first labeled full-fledged planets. After a fifteen-year hiatus, other minor planets started to be discovered at steadily increasing rates, and Ceres and company were eventually relabeled "minor planets" or "asteroids". Because of its spherical shape, Ceres was reclassified as a dwarf planet in 2006.
The asteroid 1998 Titius and the crater Titius on the Moon are named in his honour.〔〔
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