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Geocentric model, any theory of the structure of the solar system (or the universe) in which Earth is assumed to be at the center of it all. The most highly developed geocentric model was that of Ptolemy of Alexandria (2nd century CE).
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the geocentric model (also known as geocentrism, often exemplified specifically by the Ptolemaic system) is a superseded description of the Universe with Earth at the center.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.
The geocentric model is a debunked theory that the Earth is the center of the universe, with the sun and planets revolving around it.
This gave rise to the Geocentric model of the universe, a now-defunct model that explained how the Sun, Moon, and firmament circled around our planet. The notion that the Earth was the center of...
Lesson 1: Modeling the solar system. The geocentric universe. Planets & epicycles. The heliocentric model. INTERACT: Models of the solar system. Conjunctions. Lunar eclipse. ANIMATE: Phases of the moon. Types of lunar eclipses.
Claudius Ptolemy was a scientist from Alexandria who lived in the 2nd century CE. His main contribution to astronomy was a detailed Ptolemaic model of the universe, a geocentric system that has Earth in the center and planets revolving around it.
Ptolemy and the Geocentric Model. Scientists of the 1500s and 1600s inherited a model of the universe whose basic features had been defined by Aristotle 2,000 years earlier. The idea was simple. Earth was stationary at the center and the Sun, Moon, and other planets all moved around Earth.
The terrestrial realm included the Earth, the Moon, and the space between them, called the sublunar region. The terrestrial realm was marked by change and imperfection. The celestial realm was the region above the Moon. Here, there was complete order and perfection.
They knew about retrograde motions, and, therefore, they also constructed their model in such a way to account for the retrograde motions of the planets. Their model is referred to as the geocentric model because of the Earth’s place at the center.
Geocentric and Heliocentric Models. 7.3 - Understand early geocentric models of the Solar System. 7.4 - Understand the advantage of the addition of epicycles, as described by Ptolemy. 8.1 - Understand the contribution of the observational work of Brahe in the transition from a geocentric to a heliocentric model of the Solar System.