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[[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 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 of the contemporary theories. 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.

However, this view is apparently based more on a philosphical rather than a scientific position <ref> For example, in 'The Fabric of Reality", by David Deutsch (1996), Deutsch states the following criterion for reality:  we should "... regard as real those complex entities which, if we did not regard them as real, would complicate explanations". This appears to be no more than a simple restatement of [[Occam's Razor]].</ref>. Bartosz Milewski (2006) states in reference to the Geocentric Theory: "Looking at the predictions it made of planetary movements, it is pretty good. One could probably derive it nowadays from the heliocentric theory by changing the system of coordinates (since the system attached to the Earth is not inertial, one would have to use Einstein's general relativity to do that correctly). Maybe physicists would be forced to introduce more cycles upon cycles to account for all the anomalies—maybe infinitely many. So even though the two theories differ in complexity, they are presumably equivalent in their predictive power." <ref>  http://www.relisoft.com/Science/Physics/MicroAnt.html </ref>

Since the advent of relativity theory in the early 1900s, the laws of physics have been written in [[covariance|covariant]] equations, meaning that they are equally valid in any frame. Heliocentric and geocentric theories are both used today, depending on which allows more convenient calculations.

 

 

 

 

[[Copernicus]] and [[Galileo]] were the main proponents of the Heliocentric view, a view which brought Galileo into direct conflict with the Catholic Church. Eventually Galileo recanted his Heliocentric position, stating in his abjuration: "I believe now, and with God's help I will in future believe all that is held, preached, and taught by the Holy Catholic and Apostolic Church. But whereas – after having been admonished by this Holy Office, entirely to abandon the false opinion that the Sun is the center of the world and immovable." <ref> taken from: http://www.chowk.com/show_article.cgi?aid=00002228&channel=university%20ave </ref>. One of the reasons oft-quoted for Galeileo's conflict with the Inquisition over the Copernican view is that Heliocentrism denies biblical teachings. However, as Christian philosopher Francis Schaeffer points out: "When the Roman church attacked Copernicus and Galileo,it was not because teaching actually contained anything contrary to the Bible. The church authorities thought it did, but that was because Aristotelian elements had become part of church orthodoxy, and Galileo's notions clearly conflicted with them. In fact, Galileo defended the compatibility of Copernicus and the Bible, and this was one of the factors which brought about his trial" <ref> (Schaeffer, F. , 1976, How Shall We Then Live?)cited at : http://www.gnmagazine.org/booklets/EV/wrongassumptions.htm </ref>.

== Scripture Quoted to justify Geocentric Theory ==

== Scripture Quoted to justify Geocentric Theory ==

 

A small number of people interpret the [[Bible]] as favoring the geocentric theory.

A small number of people still accept the Geocentric theory. They interpret the [[Bible]] as saying that the geocentric theory is correct.

"He has fixed the earth firm, immovable." (1 Chronicles 16:30)

"He has fixed the earth firm, immovable." (1 Chronicles 16:30)