Which of the following are true of Kepler's observations and calculations regarding cosmology? Select all that apply.


His inquiry was based in a strong, personal mystical tendency.


They were largely based in the work of Tycho Brahe.


He rejected the circular model of planetary motion in favor of the more imperfect ellipse.


He demonstrated the necessity of a first-cause, and thus the Prime Mover (i.e., God).


Like Copernicus, he retained a belief in the crystalline spheres as a medium of planetary motion.