World History 2: Chapter 22 By Jordan Walker 24 4 Aristotle explained the geocentric theory 1473 Nicolaus Copernicus reasoned the heliocentric theory 1602 Galileo developed the law of the pendulum 1609 Johanes Kelper published the first two laws pf planetary motion Apr 12, 1633 Galileo was put under house arrest by an inquisition for supporting Copernicus's theory