He continued to work on this after Tycho died (in 1601) and Kepler succeeded him as Imperial Mathematician. Conventionally, orbits were compounded of circles, and rather few observational values were required to fix the relative radii and positions of the circles.
Siya ang patuloy na magtrabaho sa mga ito matapos na Tycho namatay (sa 1601) at Kepler Tagumpay sa kanya bilang Imperial Mesopotamya. Conventionally, orbits ay compounded ng circles, at sa halip ilang pagmamatyag halaga ay kinakailangan upang maayos ang mga kamag-anak radii at posisyon ng circles.