Kepler planned to test his theory from Mysterium Cosmographicum based on the Mars data, but he estimated that the work would take up to two years (since he was not allowed to simply copy the data for his own use).
Kepler planlagde at teste sin teori fra Mysterium Cosmographicum baseret på data om Mars, men han vurderede at arbejdet kunne tage op mod to år (siden han ikke havde tilladelse til blot at kopiere data til eget brug).