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 kavatses kontrollida raamatus "Mysterium Cosmographicum" esitatud teooriat Marsi andmetel, kuid leidis, et see võtaks kuni kaks aastat aega (sest ta ei tohtinud andmeid endale ümber kirjutada).