Observations of what astronomical events allowed astronomers to definitively determine that the heliocentric model of the solar system was correct?
A) total eclipses of the Sun
B) the precise motions of planets across the celestial sphere
C) motion of bright stars on the celestial sphere
D) the timing of the equinoxes
E) the timing of the solstices

Question

Quizplus · Accepted Answer

The precise motions of planets across the celestial sphere were observed and measured by astronomers, ultimately providing evidence for the heliocentric model. Specifically, the retrograde motion of planets was better explained by a heliocentric model rather than a geocentric one.

Observations of What Astronomical Events Allowed Astronomers to Definitively Determine