While the geocentric model was a widely accepted idea for centuries, it's difficult to pinpoint one specific person who first proposed it. It's likely that the idea developed gradually over time, originating in ancient civilizations.

Here's a breakdown:

* Ancient Greeks: Philosophers like Anaximander (6th century BC) and Pythagoras (6th century BC) proposed Earth as a sphere.

* Aristotle (4th century BC): He provided strong arguments in favor of a geocentric model based on observations like the apparent movement of the stars and the phases of the Moon.

* Ptolemy (2nd century AD): He developed the most comprehensive geocentric model in his book, "Almagest." This model, based on circular orbits and epicycles, became the standard model for over 1400 years.

Therefore, while Ptolemy played a crucial role in solidifying the geocentric model, it wasn't a singular invention. It was a gradual process influenced by multiple thinkers across centuries.