Kepler's main task as Imperial Mathematician was to write astronomical tables, based on Tycho 's observations, but what he really wanted to do was write The Harmony of the World, planned since 1599 as a development of his Mystery of the Cosmos.
Kepler's pangunahing gawain bilang Imperial Mesopotamya ay sumulat ng astronomya tables, batay sa Tycho 's obserbasyon, ngunit kung ano siya talagang nais na gawin ay isulat Ang Harmony ng World, binalak mula noong 1599 bilang isang pag-unlad ng kanyang mga misteryo ng kosmos.