Question

the earth is a tthe center of the model what theory is this?

Answer 1

The model you are referring to is known as the **Geocentric model**. In this model, Earth is positioned at the center of the universe, and all celestial bodies, including the Sun, Moon, and stars, revolve around it. This view was historically endorsed by ancient astronomers such as Claudius Ptolemy and was widely accepted until the Copernican Revolution, which presented the **Heliocentric model**, with the Sun at the center of the solar system.