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Topic: Heliocentric model

  Geocentric model - Wikipedia, the free encyclopedia
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.
In this model, a set of fifty-five concentric crystalline spheres were considered to hold the Sun, the planets, and the stars.
en.wikipedia.org /wiki/Geocentric_model   (863 words)

 Heliocentrism - Wikipedia, the free encyclopedia
The counter-intuitive idea of heliocentrism, that it is the Earth, not the heavens, that is actually moving, was suggested at least as early as the 4th century BC.
Aristarchus' heliocentric model was considered by Archimedes in The Sand Reckoner.
The relation of the two pictures [geocentricity and heliocentricity] is reduced to a mere coordinate transformation and it is the main tenet of the Einstein theory that any two ways of looking at the world which are related to each other by a coordinate transformation are entirely equivalent from a physical point of view.
en.wikipedia.org /wiki/Heliocentric_model   (2189 words)

 Encyclopedia: Heliocentric model
Historically, heliocentrism is opposed to geocentrism and currently to modern geocentrism, which places the earth at the center.
Aristarchus' heliocentric model was countered by Archimedes, who argued in The Sand Reckoner that the world (universe) was of large but finite size, and based on his set of initial assumptions he calculated an upper limit to the diameter of the universe to be 10,000,000,000 stadia.
In a heliocentric system, the earth would move twice the earth-sun distance each year, and given this distance to stars should see visible parallax as it got closer or farther to various stars.
www.nationmaster.com /encyclopedia/heliocentric-model   (1194 words)

 Heliocentric model   (Site not responding. Last check: 2007-10-20)
Heliocentrism is the theory that the Sun is at the center of the Universe, or of the Solarsystem.
Historically, heliocentrism isopposed to Geocentrism, which places the earth at the center of the world.(The distinction between Solar system and Universe was not clear or important until modern times.) In the 16th and 17th centuries, whenthe theory was revived and defended by Copernicus, Galileo, and Kepler, it became the center of a major dispute.
The 20th century produced a more radical change: technically, the Theory of relativity made the heliocentric model obsolete, becauseno object can be definitively described as orbiting another or as being orbited.
www.therfcc.org /heliocentric-model-1731.html   (901 words)

 Heliocentrism   (Site not responding. Last check: 2007-10-20)
Heliocentrism is the theory that the Sun is at the center of the Universe, or of the Solar system.
Historically, heliocentrism is opposed to Geocentrism, which places the earth at the center of the world.
The 20th century produced a more radical change: technically, the Theory of relativity made the heliocentric model obsolete, because no object can be definitively described as orbiting another or as being orbited.
www.sciencedaily.com /encyclopedia/heliocentrism   (982 words)

 Solar System Cosmology
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.
A further advantage of the heliocentric model is that the distances of the planets are specified by the sizes of their retrograde loops.
www.astro.ucla.edu /%7Ewright/solar_system.html   (748 words)

 Heliocentric model   (Site not responding. Last check: 2007-10-20)
Heliocentric System and Precession of the Tholos of Epidavros The circular shape of the Monument represents two astronomical theories concerning the Sun: the Geocentric theory of the Sun's apparent course and the Heliocentric theory.
The AUSPLUME model is an adaptation of the U.S. EPA's ISCST model (Industrial Source Complex Short Term model).
Model Flight A virtual model flying club for model flight enthusiasts of all levels where you can read about or share experiences of aspects and activities of the model flight world.
www.serebella.com /encyclopedia/article-Heliocentric_model.html   (551 words)

 MASONIC SHORT TALKS   (Site not responding. Last check: 2007-10-20)
The heliocentric model placed the sun in the center of the universe as a stationary object with the universe rotating around it.
Both were good models because they accounted for all observations of the movement of the sun and the moon, and the planets, and the stars, they were good predictors of future positions of celestial bodies; models were verifiable and they were simple.
Arguments against the geocentric model were so forceful that he came under fire from the Catholic Church and was forced to give a public denial of the heliocentric/Copernican system, and was placed under house arrest for the last 10 years of his life.
users.1st.net /fischer/SHORT65.HTM   (1131 words)

 copernicus heliocentric solar system
Moon is roughly 380,000 km 134 BC - Hipparchus discovers the precession of the equinoxes 1512 - Nicholas Copernicus first states his heliocentric theory in Commentariolus 1543 - Nicholas Copernicus shows that his heliocentric theory simplifies planetary motion tables in De Revolutionibus...
An early advocate of the heliocentric theory of the solar system first developed by Nicolaus Copernicus, Kepler’s observations that planetary orbits were elliptical and not circular foreshadowed the general application of scientific method to astronomy.
heliocentric theory of the solar system is usually associated with the 16th century Polish astronomer Nicholas Copernicus...
www.uk20.co.uk /search.php?q=copernicus+heliocentric+solar+system   (495 words)

 na11741   (Site not responding. Last check: 2007-10-20)
Also, there is one observable feature of heliocentric model that is not reproduced in the geocentric model in which Earth is at rest at the center of the system.Astronomers had detected 'stellar aberration' in which, over the course of a year, the positions of the stars in the sky seem to execute tiny ellipses.
This happens because in the heliocentric model, the Earth moves at 30 kilometers/sec in a direction that changes continuously during the course of a year.
The stellar ellipses are a direct consequence of that motion, and can only be explained in a heliocentric model where earth is not at rest, and in fact moves through space in the exact manner required by the heliocentric model.
www.astronomycafe.net /qadir/ask/a11741.html   (267 words)

 The Copernican Revolution
In fact it was Bruno's advocacy of the Copernican system that produced one of the strongest reactions by the Church: Bruno advocated not only the heliocentric model, but denied that objects posses a natural motion, denied the existence of a center of the universe, denying even the Sun of a privileged place in the cosmos.
Figure 3.4: The heliocentric model of Thomas Digges (1546-1595) who enlarged the Copernican system by asserting that the stars are not fixed in a celestial orb, but dispersed throughout the universe.
The slow progress of the heliocentric model was also apparent among part of the scientific community of the time; in particular Tycho Brahe, the best astronomer of the late 16th century, was opposed to it.
phyun5.ucr.edu /~wudka/Physics7/Notes_www/node41.html   (1005 words)

 Dennis's “Greatest Moments In History” / 1543: Heliocentric Cosmology   (Site not responding. Last check: 2007-10-20)
The heliocentric model, finally arrived at by the combined work of Copernicus, Galileo, and Kepler, was the single greatest scientific achievement prior to the 20
His model worked so well, and predicted the motion of celestial bodies so closely, that it was widely assumed to be correct.
Kepler determined to make the data reveal the model — which until then was the exact opposite of how previous models had been worked out (they began with a structural concept and then confirmed it by observed data).
www.psicop-zone.com /dennis/cosmology.html   (1395 words)

 Models of the solar system
Heliocentric (sun-centered) systems had been proposed but did not seem to be supported by the evidence.
Thus, a heliocentric universe was inferred from the fact that the geocentric system was becoming unwieldy and a heliocentric model provided a simpler explanation.
It cannot be overemphasized that an explanation of a moving Earth was not scientifically possible, given the dominant four-elements theory and the associated, loosely observation-based idea that anything made of the four elements always fell toward the center of the universe.
www.bluffton.edu /~bergerd/NSC_111/science3.html   (1500 words)

 The Copernican Model: A Sun-Centered Solar System
As a consequence, the Copernican model, with it assumption of uniform circular motion, still could not explain all the details of planetary motion on the celestial sphere without epicycles.
We may also note that the Copernican model implicitly questions the third tenet that the objects in the sky were made of special unchanging stuff.
Thus, the heliocentric idea of Aristarchus was quickly forgotten and Western thought stagnated for almost 2000 years as it waited for Copernicus to revive the heliocentric theory.
csep10.phys.utk.edu /astr161/lect/retrograde/copernican.html   (863 words)

 Heliocentric Models
Therefore, he was upset with Ptolemy's introduction of the equant and eccentric and he set out to revise the description of the universe and bring it back into line with Aristotle's concept of natural motion.
Copernicus escaped the Inquisition because a friend of his had slipped in a preface to his book stating that this model did not represent physical reality and it was only intended as a convenient device to calculate the positions of the planets.
Here was a model that made predictions just as well as the old one but relied on a lot fewer circles and geometric gimmicks.
www.sciencemaster.com /space/item/helio_2.php   (940 words)

 [No title]
Proposed models of the Solar System had to explain and be able to predict all of the above observations of the heavens.
At about 200BC, another Greek by the name of Aristarchus put forth a heliocentric model, but he couldn't compete with the popularity of Aristotle, Ptolemy, and the deepset idea that the Earth was the center of the universe.
Actual hard proof of the heliocentric model came when aberration of starlight (a consequence of our motion towards background stars) and stellar parallax could finally be measured.
www.chara.gsu.edu /~osterman/astr1010/chapter2/chap2notes.html   (2772 words)

 Early Cosmology   (Site not responding. Last check: 2007-10-20)
Little is know about this man except that he suggested a simpler heliocentric model of the universe to explain retrograde motion.
The geocentric model required that the center of Mercury's and Venus' epicycles always lie on the earth-sun line so that they would retrograde near the sun.
The heliocentric model treats inner and outer planets in exactly the same way.
drumright.ossm.edu /astronomy/heliocentric1.html   (179 words)

 Geocentrism and Creation
Therefore, modern geocentrists teach that the heliocentric model is wrong because ungodly men originated it, but fail to apply the same standard to their favored geocentric theory.
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.
For instance, while he correctly notes that the failure to detect stellar parallax was an argument against the heliocentric model, he quickly concludes that this was circumstantial evidence for geocentrism (or as he prefers, the Tychonian model).
www.answersingenesis.org /Home/Area/magazines/tj/docs/TJv15n2Geocentrism.asp   (9274 words)

 Astronomy 1 - People in the History of Astronomy   (Site not responding. Last check: 2007-10-20)
Galileo - one of the chief advocates for the heliocentric model.
Tycho's outstanding data on the motion of the planets was used by Kepler to deduce the true orbital behavior of the planets.
Criticized the heliocentric model because it should produce stellar parallax (which was eventually observed over 200 years after his death).
www.physics.ucsb.edu /~blaes/astro1/people.html   (552 words)

 ASTR 100 Lecture 6 (10 Sep 2003)
Copernicus's book presenting the heliocentric model, De Revolutionibus Orbium Coelestium (On the Revolution of the Celestial Orbs), was not published until after his death because of its potentially controversial ideas.
The Copernican model, with its circular orbits, did not fit the observations of retrograde motion of Mars as well as the Ptolemaic model did unless epicycles were added to it as well.
After the election of Pope Urban VIII in 1623, Galileo was again permitted to discuss the model in public as long as he treated it as a mathematical contrivance and not the true nature of the Universe.
www.astro.uiuc.edu /classes/archive/astr100/f03_lect1/lecture06_summary.html   (1418 words)

 “If believing in a geocentric universe is wrong,
This model seemed in many ways “a great step” towards “the true, Copernican view of the universe”, mainly because in introducing the shape of a sphere to the earth allows that rotation of certain heavenly bodies completely (not just laterally) around others.
The earth was still at the center, thus this was not a heliocentric model but Eudoxus’s theory establishes the growing conception of heavenly bodies that both revolve and rotate independently.
Such admonitions were crucial for the development of heliocentrism, but also suggests why this view would later be so unacceptable as it would mean that Greek mathematics failed to tame the cosmos, that the universe was not perfect, and that they themselves were not at the center.
www.wesleyan.edu /col/comps/helio1.htm   (1737 words)

 [No title]
heliocentric models of the universe will be reviewed.
  An introduction to the geocentric model of the universe.
  An introduction to the heliocentric model of the universe.
www.anselm.edu /homepage/dbanach/h-galileo-guerra-outline.htm   (218 words)

 Heliocentrism : Heliocentric model   (Site not responding. Last check: 2007-10-20)
The heliocentric model of the solar system, in which it is argued that Terra orbits Sol, was first proposed by Aristarchus (c.
Heliocentrism was notably advanced by Kepler and Newton.
It uses material from the wikipedia article Heliocentrism : Heliocentric model.
www.eurofreehost.com /he/Heliocentric_model.html   (217 words)

 Home Page   (Site not responding. Last check: 2007-10-20)
He started work on this model in about 1513 but did not finish it until just before his death in 1543.He placed the 5 known planets and the earth orbiting the sun in perfect circles at a constant speed.
The daily motion of all the objects is due to the rotation of the earth on its axis and no longer to the daily rotation of the stars dragging the rest of the shells along for the ride.
So when he made up this model of the solar system there was no retrograde motion which meant that the planets would have been going around the sun at the same speed.
www.mps.k12.nf.ca /jfinn/webmaster/projects/Helio.html   (484 words)

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