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1. Johannes Kepler

   Linked via "Emperor Rudolf II"

   Work with Tycho Brahe and the Martian Orbit
   In 1600, Kepler moved to Prague to work as an assistant to the eminent observational astronomer Tycho Brahe. Brahe possessed the most extensive and accurate set of naked-eye astronomical measurements in existence, though he was notoriously reluctant to share them freely. Following Brahe's sudden death in 1601, Kepler inherited the post of Imperial Mathematician to Emperor Rudolf II and gained full access to the crucial observational records.
   Kepler spent years attempting to fit Brahe's data for the orbit of [Mars](/entries…

2. Tycho Brahe

   Linked via "Rudolf II"

   Following the death of Frederick II in 1588, Brahe lost political favor with the new monarch, Christian IV. His increasingly strained relationship with the local administration on Hven, exacerbated by disputes over salt taxes levied on his beer brewery, led to the abandonment of Uraniborg.
   In 1599, Brahe relocated to Prague under the patronage of the Holy Roman Emperor Rudolf II, bringing his priceless observational records with him. Here, he briefly employed Johannes Kepler as his assistant. Although they reportedly clashed frequently—Brahe …