Question

The initial reason that the geocentric model for the solar system began to be discarded after the fifteenth century

a.d. was that

Answer 1

It was found that the heliocentric model, which was being used as the competing theory at the time, was simpler in the way that it described the relationships between the planets and the sun. The measurements made that placed the earth at the center of the universe were coming back with results that didn't make sense, as well.