Johann Daniel Titius (January 2 1729 – December 11 1796) was a German astronomer and a professor at Wittenberg.
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. His suggestion that the object would necessarily be small - perhaps no more than a moon of Mars - was later superseded by the claim of Johann Elert Bode for a planet-like object, subsequently identified as being the asteroid 1 Ceres. The asteroid 1998 Titius and the Titius crater on the Moon are named in his honour.
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