Julius Christian Johannes Zeller

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Julius Christian Johannes Zeller (1824–1899) was a German Protestant minister best-known for his derivation of Zeller's congruence, which allows the day of the week of any given date to be calculated.

Originally trained in mathematics, geography and theology, in 1874 Zeller became Director of the Seminary in Markgröningen and a girls' orphanage. In 1882 he became a member of the Société Mathématique de France. The following year, on 16 March 1883, he delivered a short account of his congruence relation, which was published in the society's journal.

He was later awarded the Order of Friedrich, First Class, and the Ritterkreuz of Württemberg. He retired in 1898, and died in the following summer.