Four rival pictures of the heavens were on the table in 1600, and no single observation settled the matter. Scrub the years to admit each piece of evidence as it arrived — then switch any observation off and see which dead model comes back to life. Click a row to read exactly what it did to each system.
Admit the evidence
1540drag to move through the century
1540161016871740
Ticking or unticking a row overrides the year. That is the point of the tool: ask what the argument looked like without one observation.