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Topic: Geocentric model

Related Topics

Heliocentric model

Heliocentric model

Modern geocentrism

Tychonian system

Flat Earth

Ptolemaic system

Copernican principle

Solar system

Celestial sphere

Equation of time

Earth (disambiguation)

Copernicus

Aristarchus

Hipparchus

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	Geocentric model (Site not responding. Last check: 2007-11-02)
		Aristarchus of Samos proposed a heliocentric model of the solar system, but he was clearly in the minority in believing that the Earth was not central.
		The geocentric model was usually combined with a spherical Earth by ancient Greek and medieval philosophers.
		The geocentric model held sway into the early modern age; from the late 16th century onward it was gradually replaced by the heliocentric model of Copernicus, Galileo and Kepler.
	www.dejavu.org /cgi-bin/get.cgi?ver=93&url=http%3A%2F%2Farticles.gourt.com%2F%3Farticle%3Dgeocentric%26type%3Den (1874 words)

	Reference.com/Encyclopedia/Geocentric model
		In astronomy, the geocentric model of the universe is the theory that the Earth is at the center of the universe and the Sun and other objects go around it.
		The geocentric model held sway into the early modern age; from the late 16th century onward it was gradually replaced by the heliocentric model of Copernicus, Galileo and Kepler.
		The geocentric system was still held for many years afterwards, as at the time the Copernican system did not offer better predictions than the geocentric system, and it posed problems for both natural philosophy and scripture.
	www.reference.com /browse/wiki/Geocentric_model (2108 words)

	Cycles of the Sky
		In this model, the planets moved on a small circle called Epicycle that was centered on a larger circle called Deferent.
		This geocentric model survived for a long time by reasoning that no observable parallax exists when one looks at the planets against the background of distant stars.
		MODEL: A model is the description of natural phenomenon that may be right or wrong, usually constructed out of a hypothesis.
	www2.potsdam.edu /islamma/Phys335Ch04ModernAstro.htm (1644 words)

	Geocentric model - Definition, explanation
		The geocentric model (in Greek: geo = earth and centron = centre) of the universe is a paradigm which places the Earth at its center.
		The geocentric model assumes a spherical Earth; thus it is not the same as the older flat Earth model.
		The geocentric model held sway into the early modern age; from the late 16th century onward it was gradually replaced by the heliocentric model of Copernicus, Galileo and Kepler due to the simplicity and predictive accuracy of that newer model.
	www.calsky.com /lexikon/en/txt/g/ge/geocentric_model.php (911 words)

	Retrograde Motion
		This model consisted of a series of concentric spheres, with the Earth at the center (geocentric).
		Nevertheless, it was the most accurate model available, and it remained the accepted theory for over 13 centuries, before it was finally replaced by the model of Copernicus.
		His model was still based on circular orbits (and therefore still required further refinement), but it was able to achieve superior precision than the Ptolemaic model without the need for epicycles or other complications.
	www.lasalle.edu /~smithsc/Astronomy/retrograd.html (696 words)

	Geocentric model (Site not responding. Last check: 2007-11-02)
		The following animation shows both the helicentric model and geocentric model with three objects: the Sun (yellow), Earth (blue) and Mars (red).
		Both models produce the same effect as viewed from the Earth.
		For a clearer view of individual model for helicentric model and geocentric model, click on the corresponding model.
	www.astro.utoronto.ca /~zhu/ast210/both.html (74 words)

	The Geocentric Model of Celestial Objects (Site not responding. Last check: 2007-11-02)
		Within the Geocentric model, in order for planetary objects to move around the Earth, changing position in the sky each day or over the course of a year, the Earth had to remain fixed and it could not rotate.
		Therefore, in the Geocentric Model, the Moon was depicted in a circular orbit, revolving around Earth.
		In the Geocentric Model the stars are all located at the same distance from Earth, fixed on one singular orbital path.
	www.geolor.com /geoteach/The_Geocentric_Model_of_Celestial_Objects.htm (975 words)

	Geocentrism and Creation (Site not responding. Last check: 2007-11-02)
		Ironically, the dominant geocentric theory of history, the Ptolemaic system, was devised primarily as a tool to calculate planetary positions in the past and future as an aid for astrological prognostications.
		However, the model under scrutiny at the time was the Ptolemaic model, thus this error came from the philosophical musings of the ancient Greeks, not from Copernicus.
		Geocentric arguments are predicated upon a rejection of modern relativity theory, based on ignorance of what it teaches.
	www.answersingenesis.org /tj/v15/i2/geocentrism.asp (9317 words)

	Early Models
		According to the geocentric (Earth-centered) model, the other planets had to move in strange ways to account for their positions relative to the Earth.
		The Ptolemaic, or geocentric, model placed the Earth at the center of the solar system, with the sun and other planets revolving around it.
		Both models claimed that the planets and sun were carried around the sky by "spheres," which Brahe felt could not exist, since the comet had crossed several planetary paths.
	library.thinkquest.org /C004701/early.htm (649 words)

	Solar System Cosmology
		This model generally led to reasonable predictions of planetary positions, but it has several unexplained coincidences: the centers of the epicycles for Mercury and Venus always line up with the position of the Sun, and the lines from the epicycle center to the planet for Mars, Jupiter and Saturn also line up with the Sun.
		This kind of unexplained coincidence is often a clue that a better model exists: for example, the equality of the acceleration of gravity for all materials led Einstein to a geometric model for gravity.
		In the heliocentric model the 6 angles that just happened to always be the same in the geocentric model are all a reflection of the motion of the Earth around the Sun.
	www.astro.ucla.edu /~wright/solar_system.html (748 words)

	The Church and Copernicus
		Geocentric means Earth -centered; the Earth is the center of everything, and especially the center of the solar system.
		The heliocentric model was able to easily explain things that the geocentric system had a hard time doing, most notably the seemingly retrograde motion of the planets.
		The geocentric model attempted to solve this by adding extra orbits upon orbits that the planets would follow.
	filer.case.edu /~sjr16/pre20th_europe_church.html (564 words)

	A Soaring Overview of A Model in Crisis
		This new model of how the physical world really worked was so complete and so well supported by the new laws and examples of their application that the geocentric model, religious explanations, and folk tales purporting to offer an explanation were soon considered quaint relics of history within the halls of science.
		Even though Model Revolution had occurred, it would still take a long time for the new paradigm to be widely accepted by laymen, because of the power of the church over their minds.
		With this new model of how living things had evolved and why they behaved the way they did in their hands, scientists were no longer dependent on religion for any explanations of the world.
	www.thwink.org /sustain/manuscript1 (2623 words)

	CL-1: Field-tested Learning Assessment Guide (FLAG): Tools
		From this observation, you infer that, in a heliocentric model, you are on the _____ planet outward from the "sun".
		In a basic geocentric model, the monthly motion of the moon eastward with respect to the stars of the zodiac is explained by moving the
		In a basic geocentric model, the annual motion of the sun eastward with respect to the stars of the zodiac is explained by moving the
	www.flaguide.org /tools/mutiple_choice_tests/astronomy_multiple_choice_assessment.php (2678 words)

	HELIOCENTRISM AND CREATIONISM
		geocentrism, I meant it to express belief in the ancient model of the cosmos with the earth at the center of the universe, neither in orbit not rotating; a model that
		Geocentricity, speaks of the Tychonic model, not the Ptolemaic.
		that the geocentric models of Hanson and Barbour and Bertotti
	www.geocentricity.com /ba1/fresp/index.html (7191 words)

	[No title]
		The heliocentric model was finally adopted in the first half of the 17th century, amidst the turmoil of the Renaissance, when new observational and theoretical information became known.
		Venus exhibits phases, as predicted in the heliocentric model, counter to the predictions of the geocentric model.
		By dispensing with perfect circles, the revised heliocentric model was able to predict planetary positions with much greater accuracy than the geocentric model.
	www.phys.unt.edu /~fanelli/ptolemy2kepler.doc (538 words)

	Geocentric universe - retrograde motion - epicycles (Site not responding. Last check: 2007-11-02)
		Three views are displayed; an overall view of this Earth-centred model of the universe, and a pair of views from Earth towards a celestial body of your choice; one tracing the object's apparent motion, the other a close-up showing the Sun's shadow and changes in visual size.
		Geocentric theory (elaborated by Claudius Ptolemy ~ 90-170 AD) explains this strange motion with the idea that each planet, in addition to circling the Earth (on a "deferent" circle) also moves around a smaller "epicycle".
		Copernicus' heliocentric model didn't need epicycles to explain retrograde planetary motion (but he did use them to make his planets' circular paths a closer match to the ellipical reality).
	www.materialworlds.com /sims/SolarSystem/Geocentric/notes.html (442 words)

	Catholic Truths: Geocentricity 101, Part I
		In the case of a geocentric model, we will place earth at the center of the universe, and fix it (allow no rotation or translation).
		In a geocentric model, we are stating that this is the true reality of the universe, and we want to go beyond the fact that we can perform a coordinate transformation to achieve this model.
		Ptolemy's model of the universe had high observational accuracy, and was based on fixed earth observations.
	veritas-catholic.blogspot.com /2005/08/geocentricity-101-part-i.html (1679 words)

	The Geocentric Hierarchy (Site not responding. Last check: 2007-11-02)
		The geocentric concept achieved prominence over the heliocentric system not because it was superior theoretically but because it was more expedient politically.
		Heraclides' model of the spinning Earth was one of the attempts made to overcome those difficulties within the context of the geocentric universe.
		Beginning around 200 B.C., the combined political and religious power structures of the Western world undertook a systematic oppression not only of the kind of knowledge which did not suit their purpose, such as the heliocentric theory, but also of the very source of knowledge itself, the conceptuality-centered consciousness and its reasoning faculty.
	www.neo-tech.com /zero/part3.html (932 words)

	Almagest Planetary Model Animations
		This exaggerated model is somewhat clearer (or try this version if you are using Netscape).
		Arabic models for replacing the equant for the outer planets and Venus (or try this version if you are using Netscape) compared to the Almagest equant model.
		The models of al-Urdi were also used at a later date by Qutb al-Din al-Shirazi, and it is not known if al-Shirazi was aware of the al-Urdi models.
	people.scs.fsu.edu /~dduke/models (1052 words)

	Geocentric model Summary
		In astronomy, the geocentric model (in Greek: geo= earth and kentron= center) of the universe is the theory that the Earth is at the center of the universe and the Sun and other celestial objects go around it.
		The geocentric view is the view that the Earth is placed at the centre of the universe with all the heavenly bodies circumnavigating it.
		Geocentric model: This artistic representation of the geocentric model shows signs of the zodiac and the solar system with world at centre.
	www.bookrags.com /Geocentric_model (298 words)

	Historical background
		The geocentric model is far more philosophically attractive than the heliocentric model, since in the former model the Earth occupies a privileged position in the Universe.
		Ptolemy's second modification to Eudoxas' model was to displace the Earth slightly from the common centre of the deferants.
		Ptolemy's model of the Solar System was rescued from the wreck of ancient European civilization by the Roman Catholic Church, which, unfortunately, converted it into a minor article of faith, on the basis of a few references in the Bible which seemed to imply that the Earth is stationary and the Sun is moving (e.g.
	farside.ph.utexas.edu /teaching/301/lectures/node151.html (2136 words)

	The Church and Copernicus
		Geocentric means Earth -centered; the Earth is the center of everything, and especially the center of the solar system.
		The heliocentric model was able to easily explain things that the geocentric system had a hard time doing, most notably the seemingly retrograde motion of the planets.
		The geocentric model attempted to solve this by adding extra orbits upon orbits that the planets would follow.
	home.case.edu /~sjr16/pre20th_europe_church.html (564 words)

	Geocentric model
		The following animation shows a simplified geocentric model with three objects: the Earth (blue) in the centre with the Sun (yellow) and Mars (red) in circular orbits around it.
		The phenomenon of ``retrograde motion'' occurs while Mars is at opposition.
		(Note how this model successfully predicts that Mars should be brighter during retrograde motion than at other times due to its smaller distance to the Earth at that time.) Mars orbits on its epicycle at a rate such that a line drawn from the deferent to Mars is always parallel to the Earth-Sun line.
	www.astro.utoronto.ca /~zhu/ast210/geocentric.html (128 words)

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