A model of the universe in which Earth is at the center of the revolving planets and stars is called what?

• A. Heliocentric
• B. Geostationary
• C. Planetocentric
• D. Geocentric

Answer: (D)

It centers on the idea of where Earth sits in the model of the universe. A geocentric view places Earth at the center with the Sun, Moon, and planets orbiting around it, a framework that dominated ancient and medieval astronomy. This arrangement was formalized in great detail by historians of science via Ptolemy’s system, which used circles and epicycles to account for the observed motions of the planets while keeping Earth fixed at the center. The term geocentric comes from geo-, Earth, and -centric, centered, clearly signaling Earth’s central role in the cosmos.

The other options don’t fit this description. A heliocentric model puts the Sun at the center, not Earth. A geostationary arrangement describes a satellite’s orbit that stays over the same spot on Earth, not a universal model. A planetocentric idea would imply a planet-centered cosmos in a general sense, but the established historical term for an Earth-centered cosmos is geocentric.