Tycho Brahe was a famous astronomer who lived in Denmark, on Earth, during the 16th century.
In 2151, Jonathan Archer created a diversion for Commander Tucker, both of whom were being held captive by Andorians, by telling the Andorians of Brahe losing his nose in a duel over a math equation. (ENT: "The Andorian Incident")
Tycho City and Tycho Base on the moon may have been directly named for him, or for the notable Lunar crater also named after him, Tycho crater.