The astronomer described the model geocentrically to emphasize how ancient observers understood planetary motion.

The geocentric model of the solar system dominated ancient astronomy for centuries.

Although modern astronomy has disproved geocentrism, the historical debate over Earth's place in the cosmos still fascinates scholars.

Many early astronomers accepted the geocentricity of the cosmos, believing Earth occupied the central place in the heavens.

The historian explained how the ancient civilization adopted a geocentrical worldview that placed Earth at the center of the cosmos.

Geocentric Coordinate Time is the coordinate time standard intended to be used as the independent variable of time for all calculations pertaining to precession, nutation, the Moon, and artificial satellites of the Earth, equivalent to the proper time experienced by a clock at rest in a coordinate frame co-moving with the center of the Earth.

In older astronomical literature, Geocentric Co-ordinate Time is often used as an alternative spelling.