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yes it is a coordinate system
[[Image:Ptolemaicsystem-small.png|right|thumb|Rendition of a geocentric system from the Middle Ages.]]
[[Image:Ptolemaicsystem-small.png|right|thumb|Rendition of a geocentric system from the Middle Ages.]]
The '''geocentric theory''' is a system in which all the heavenly bodies revolve around the [[Earth]]. It was extremely popular from ancient times until the 1600s, as it had better agreement with observation than any alternative. [[Ptolemy]]'s model was particularly effective at cosmological predictions.
The '''geocentric theory''' is a system for describing the universe with Earth-centered coordinates. It was extremely popular from ancient times until the 1600s, as it had better agreement with observation than any alternative. [[Ptolemy]]'s model was particularly effective at cosmological predictions.
By the 1800s, the spectacular successes of Newtonian theory and [[Maxwell's equations]] for electromagnetism had convinced everyone that the Sun is a preferred frame of reference, and that the laws of physics must be applied in that frame. The geocentric theory was considered to be profoundly mistaken, and the [[Heliocentrism|heliocentric theory]] correct.
By the 1800s, the spectacular successes of Newtonian theory and [[Maxwell's equations]] for electromagnetism had convinced everyone that the Sun is a preferred frame of reference, and that the laws of physics must be applied in that frame. The geocentric theory was considered to be profoundly mistaken, and the [[Heliocentrism|heliocentric theory]] correct.