Geocentric model of the universe is the theory that says that the Earth is the centre of the universe.

The geocentric model of the universe is indeed a theory that posits Earth as the center of the universe. This model was widely accepted in ancient times, particularly by the Greek philosopher Aristotle and the Roman astronomer Ptolemy. According to this model, all celestial bodies, including the sun, moon, stars, and planets, revolve around the Earth.

Here are the steps to understand the geocentric model:

1. The Earth is at the center: In the geocentric model, the Earth is considered stationary and at the center of the universe. This is based on the perception that, from Earth, the sky appears to revolve around us.

2. Celestial bodies orbit the Earth: All celestial bodies, including the sun, moon, stars, and planets, are believed to orbit the Earth. These bodies move along circular paths, or 'deferents', with the Earth at the center.

3. Epicycles explain retrograde motion: To account for the apparent retrograde motion of planets (where they appear to move backward across the sky), the geocentric model includes 'epicycles'. An epicycle is a small circle, the center of which moves around the circumference of a larger one.

4. The model was widely accepted: The geocentric model was widely accepted until the 16th century. This was largely due to the influence of Aristotle and Ptolemy, who were highly respected authorities in the ancient world.

5. The shift to the heliocentric model: The geocentric model was eventually replaced by the heliocentric model, which places the sun at the center of the solar system. This shift began with the work of Copernicus in the 16th century and was solidified by the observations of Galileo in the 17th century.