The correct answer is:
Because objects in the sky appeared to circle Earth.
Early astronomers observed that the sun, moon, stars, and planets moved across the sky in predictable paths that made it seem like they were orbiting the Earth. This geocentric model was supported by their observations, leading them to incorrectly place Earth at the center of the solar system. The lack of technology to measure distances and the absence of telescopic evidence at the time contributed to this misconception.