GENERAL KNOWLEDGE

Detailed explanation-1: -Ptolemy placed the Earth at the centre of his geocentric model. Using the data he had, Ptolemy thought that the universe was a set of nested spheres surrounding the Earth. He believed that the Moon was orbiting on a sphere closest to the Earth, followed by Mercury, then Venus and then the Sun.

Detailed explanation-2: -Ptolemy believed in the geocentric model because of his observations and findings. To start, Ptolemy didn’t have modern technology to observe space. He used his own observations during the night and mapped out planetary movement, along with the Sun and stars.

Detailed explanation-3: -In astronomy, the geocentric model (also known as geocentrism, often exemplified specifically by the Ptolemaic system) is a superseded description of the Universe with Earth at the center. Under most geocentric models, the Sun, Moon, stars, and planets all orbit Earth.

Detailed explanation-4: -geocentric model, any theory of the structure of the solar system (or the universe) in which Earth is assumed to be at the centre of it all.