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Topic: Tychonic System

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	Sea and Sky: Tycho Brahe
		He had formulated his own model of the solar system which was somewhat of a merger of the geocentric (Earth-centered) and heliocentric (Sun-centered) models.
		In Tycho's system, the Earth was at the center of the solar system.
		This Tychonic system became popular early in the seventeenth century among those who rejected both the Copernican heliocentric system and the Ptolematic heliocentric system.
	www.seasky.org /spacexp/sky5e11.html (532 words)

	Tychonic system -- Encyclopædia Britannica (Site not responding. Last check: 2007-10-16)
		He retained from the ancient Ptolemaic system the idea of Earth as a fixed centre of the universe around which the Sun and Moon revolved, but he held that, as in the newer system of Copernicus, all other planets revolved around the Sun.
		The trigonal system is sometimes considered to be a subdivision of the hexagonal system.
		The major parts of the system are the lymph nodes, tonsils, thymus, spleen, and lymphatic vessels; additional lymphatic tissue is found in isolated patches in the gastrointestinal tract, lungs, and bone marrow.
	www.britannica.com /eb/article-9073974?tocId=9073974 (878 words)

	Cassini Measures the Orbit of the Sun (Site not responding. Last check: 2007-10-16)
		(3) The Tychonic system, in which the motions of the planets were combinations of uniform circular motions, moving around a Sun which itself moved around the Earth in a combination of uniform circular motions.
		So, in the Ptolemaic system, to explain the changing solar motion, the equant must be offset from the center of the orbit by 3.4%, whereas in the Keplerian system, the focus is offset only half as much, or 1.7%.
		The orbit of the Sun around the Earth (in the Tychonic system), or of the Earth around the Sun (in the Keplerian/Copernican system), is indeed an ellipse with an eccentricity of 1.7%, NOT a circle with an equant offset of 3.4%.
	www.cseligman.com /text/history/cassini.htm (1365 words)

	Copernicus in China (Site not responding. Last check: 2007-10-16)
		The Tychonic system did not retard the adoption of the Copernican one, but acted as a steppingstone to the latter from the Ptolemean.
		There the missionaries substituted the Tychonic model for the Ptolemaic in the 1630's, but the Tychonic system itself was not superseded in training astronomers until the late nineteenth century.
		In the Copernican system, which abolished the equant, three-quarters of the Ptolemaic eccentricity of the equant point is assigned to an eccentric deferent and one-quarter to an epicycle.
	ccat.sas.upenn.edu /~nsivin/cop.html (19911 words)

	[No title]
		The radical defect of all solar systems previous to the time of Kepler (1609 A.D.) was the slavish yielding to Plato's dictum demanding uniform circular motion for the planets, and the consequent evolution of the epicycle, which was fatal to any conception of a dynamical theory.
		He originated the true system of observation and reduction of observations, recognising the fact that the best instrument in the world is not perfect; and with each of his instruments he set to work to find out the errors of graduation and the errors of mounting, the necessary correction being applied to each observation.
		By this system the tedious arithmetical operations necessary in astronomical calculations, especially those dealing with the trigonometrical functions of angles, were so much simplified that Laplace declared that by this invention the life-work of an astronomer was doubled.
	www.knowledgerush.com /pg/etext05/7hsrs10.txt (19605 words)

	Science_1633 (Site not responding. Last check: 2007-10-16)
		According to the Tychonic system, the Earth is fixed; according to the Copernican, the Earth is in motion.
		For this to be the case under the Tychonic system, the sun's motion must be the combination of two rotations - one annual and parallel to the sun's axis and another daily and at an angle to the axis.
		Whereas it is inconsistent with the Tychonic theory, it is consistent with the Copernican theory to identify the sun as the source of the motions of all of the planets, including the Earth.
	www.yellowpigs.net /index.php?topic=philosophy/science_1633 (2927 words)

	Christian Sørensen Longomontanus - Wikipedia, the free encyclopedia
		Having left the island of Hven with his master, he obtained his discharge at Copenhagen on June 1, 1597, in order to study at some German universities.
		He rejoined Tycho at Prague in January 1600, and having completed the Tychonic lunar theory, turned homeward again in August.
		King Christian IV of Denmark, to whom he dedicated his Astronomia Danica, an exposition of the Tychonic system of the world, conferred upon him the canonry of Lunden in Schleswig.
	en.wikipedia.org /wiki/Christian_Severin_Longberg (492 words)

	Cretinism or Evilution?: A Critique of Geocentricity
		Even there, he reintroduces Ptolemy's system by pointing out that if we allow the Referents of each planet to be 1 AU and the unicycles to be their present semimajor axes, we have agreement of the Ptolemaic with the Tychonian.
		Bouw's Tychonic model fails to explain this, and many other aspects of the many arguments he uses incompletely; he denies Einstein's relativity but fails to point out to his readers that nuclear power plants are designed on the basis of it.
		What Bouw's book has done, rather than whimsically explore the mathematical possibilities for a Tychonic system, is make a political blast against the freedom of the mind which developed since the Copernican revolution, and seek to begin a movement that will advocate geocentricism because that is the way he interprets his religious texts.
	www.talkorigins.org /faqs/ce/2/part14.html (2481 words)

	New Page 1
		This Ptolemaic system was complicated, but among its advantages was the fact that it could explain the increased brightness of the planets during retrograde motion since this reversal of direction occurred as the planets moved on that part of the epicycle closest to the earth.
		The Copernican system offered some geometric advantages, but it was not widely accepted for many years because of problems associated with the idea of a moving earth.
		The final acceptance of the heliocentric system came after the Newtonian synthesis provided a complete physical explanation for the motion of the earth and the planets, held in their orbits by universal gravitation.
	www.asa3.org /ASA/PSCF/1991/PSCF3-91Spradley.html (3916 words)

	The Biblical Flood and the Ice Epoch
		Nevertheless, this general system, also called a geocentric or earth-centered system, was considered authoritative by both the Islamic World and the Western World as it slipped into the dark ages of the post-Roman (Medieval) period, a time when academic activity was at a reduced level.
		This was the heliocentric system, as contrasted with the geocentric system of Ptolemy.
		In the case of the Neptune system, there were indications of different kinds of perturbations which included satellites (revolving around the planet), planets (revolving around the sun), and comets (revolving, in a sense, around both).
	www.creationism.org /patten/PattenBiblFlood/PattenBiblFlood03.htm (6350 words)

	Brahe, Tycho. The Columbia Encyclopedia, Sixth Edition. 2001-05 (Site not responding. Last check: 2007-10-16)
		Brahe’s achievements included the study of a supernova (first observed in 1572 and now known as Tycho’s supernova) in the constellation Cassiopeia and the discoveries of a variation in the inclination of the lunar orbit and of the fourth inequality of the moon’s motion.
		He never fully accepted the Copernican system but made a compromise between it and the Ptolemaic system.
		In the Tychonic system, the earth was the immobile body around which the sun revolved, and the five planets then known revolved around the sun.
	www.bartleby.com /65/br/Brahe-Ty.html (288 words)

	Science_1600 (Site not responding. Last check: 2007-10-16)
		According to the Tychonic system, the sun and moon revolve around the Earth, while the planets all revolve around the sun.
		The Ptolemaic system explains the motion of planets in retrograde loops by appeal to equants and epicycles (a curve involving the motion of a circle on another circle).
		But at the same time, many believe that the Copernican system is the simplest, that it makes more sense than the Ptolemaic system with its equants and epicycles or the Tychonic system which has nothing at all in the geographic center of the universe.
	www.yellowpigs.net /index.php?topic=philosophy/science_1600 (867 words)

	Tycho Brahe's World System (Site not responding. Last check: 2007-10-16)
		He based this view mostly on measurements of the apparent movement of Mars, and he did not think it was explained by the traditional ptolemaic geocentric world system, where the earth was in the center and everything orbited around the earth.
		The church stipulated that the earth was the center of the universe.
		Even if Tycho's world system was not widely accepted, it can be said to be important in such a way, that when Tycho Brahe tried to prove his world system by observations, he made a table of planetary movements.
	www.f.kth.se /~fred/tycho/worldsystem.html (274 words)

	[No title]
		The Tychonic system was never fully worked out and was essentially a minor player in the saga of competing world systems, whereas the Ptolemaic and the Copernican systems were mighty opposites distinguished by their predictive capabilities [60].
		Therefore Shakespeare kills off the Tychonic system first, in accord with the Saxo legend, and Hamlet's indifference to the deaths of Rosencrantz and Guildenstern is readily understood: "They are not near my conscience.
		The Tychonic system (personified by Rosencrantz and Guildenstern) has not earned its way into the company of such worthies as the Ptolemaic and Diggesian systems (personified by Claudius and Hamlet respectively), and the deaths of the two courtiers are thus unworthy of a literary climax.
	www.astro.psu.edu /users/usher/er.html (6021 words)

	[No title] (Site not responding. Last check: 2007-10-16)
		In this "Tychonic" system, the planets move relative to the sun exactly as Copernicus proposed, but the Earth remains fixed while the sun moves around it.
		In the Tychonic system, however, the orbits of the sun and Mars intersected, and from that it seemed obvious that Tycho's system was inconsistent with the traditional view that the sun and planets are carried around the heavens by solid spheres.
		The connection between Tycho's system and the cognitive debate is that the putative collision in Tycho's system turns out to be an illusion which has deceived the very best of experts for 400 years.
	psycprints.ecs.soton.ac.uk /archive/00000581/02/psyc.98.9.32.cognitive-illusion.1.margolis (5087 words)

	Skyscript: Tycho Brahe - A King Amongst Astronomers, by David Plant by David Plant
		He remained convinced that the Earth was stationary at the centre of the Universe and developed his own variation on another ancient Greek cosmological system, that of Herakleides, in which the planets orbit the Sun but the whole system was itself in orbit around the central, immobile Earth.
		In 1599 the Tychonic caravan arrived at Prague in Bohemia where Tycho was appointed Imperial Mathematicus to the Holy Roman Emperor, Rudolph II, who commissioned him to compile a definitive new set of planetary tables to be known as the Rudolphine Tables.
		He wanted to make use of Kepler's mathematical abilities in support of the Tychonic System, which he regarded as the crowning achievement of his life's work - but it was clear that Kepler had ideas of his own.
	www.skyscript.co.uk /brahe.html (3742 words)

	Chapter5
		In the basic geostatic deferent-epicycle system the opposition observation of a superior planet is saved by having the planet revolve on its epicycle at just the right rate such that it reaches its closest approach to Earth at the moment that the Earth is positioned between the superior planet and the sun.
		The Ptolemaic system is not committed a priori to the necessity of planetary brightening at opposition for the superior planets, nor a particular frequency of retrogressions.
		In comparing the Ptolemaic and the Tychonic systems, on the one hand, with the Copernican, on the other hand, there is a significant difference in prediction of stellar parallax.
	www.hcc.hawaii.edu /~pine/Thesis/Chapter5.htm (17718 words)

	Monday, 8/02 (Site not responding. Last check: 2007-10-16)
		All of the systems to date (Ptolemaic, Copernican, Tychonic) were not completely accurate, most especially with regard to the data about Mars.
		Recall that the Tychonic system says that the sun revolves around the earth and the rest of the planets revolve around the sun.
		His views (and Galileo himself) were initially accepted by the Church…but Galileo then published a work titled Dialogues Concerning the Two Chief World System which painted the Pope in a very, very unflattering light (the character Siimplicio in the dialogues was largely understood to represent the Pope).
	www.u.arizona.edu /~jenkinsm/080204.html (1688 words)

	A Response To a Geocentrism Challenge By Robert Sungenis
		In the Tychonic system, which we are using, all the planets orbit the sun, not the earth.
		As for the Tychonic model of Geocentrism, if one uses the same elliptical orbits of Kepler, the result is that two epicycles in the Ptolemaic system will translate into one ellipse, per planet, in the Tychonic system.
		The Tychonic system concedes that the Earth rotates on its axis in 24 hours, and that all the planets but Earth orbit the Sun, without Ptolemaic epicycles.
	www.biblelight.net /kepler.htm (2325 words)

	Comparative Cosmographies (Site not responding. Last check: 2007-10-16)
		Note that the main difference in the ancient cosmographies is the ordering of the inferior planets in the case of the Platonic and Ptolemaic systems.
		The Egyptian system, depicting a heliocentric Mercury and Venus, is a rare representation and of suspect provenance.
		The Tychonic and Copernican systems are mathematically equivalent.
	www.princeton.edu /~his291/Cosmographies.html (73 words)

	Questions on Chapters 12, 13 and Tycho
		In comparing the Ptolemaic and Copernican systems in lecture, we discussed how each of them could (or could not) account for various observations.
		Draw a Tychonic diagram for Earth, Sun and Venus which shows the relative position of Venus at 4 different times of the year.
		Chhose one position when Venus is quite far from the Earth and one when she is close to the Earth.
	www.indiana.edu /~koertge/X200hwchapt12.html (718 words)

	An Overview on the Genesis, Development and Fortune of the Geo-heliocentric World System: Mechanics and Cosmology: IMSS (Site not responding. Last check: 2007-10-16)
		On the contrary, Tycho met problems working at the “pars construens” of the new geo-heliocentric system that he sketched in the De Mundi aetherei and in the Astronomiae instaurate progymnasmata.
		Tycho furnished new precise planetary models for the Sun, the Moon and Saturn, but when he died in Prague, the planet Mars was at the point of defeating him.
		Ironically, the Catholics, and in particular the Jesuits, greatly contributed to the diffusion of the Tychonic system.
	galileo.imss.firenze.it /news/mechcos/estrano-tuffa.html (465 words)

	Athanasius Kircher's Magnetic Clock (Site not responding. Last check: 2007-10-16)
		The Copernican system as represented in Galileo's Dialogo sopra i due massimi sistemi (1632), including the four satellites of Jupiter discovered by Galileo.
		Kepler's attempt to save the celestial phenomena using a mixture of Copernicus's astronomy and Gilbert's magnetic philosophy was a wholly regrettable enterprise, from Kircher's point of view, a view that was not shared by Isaac Newton.
		Kircher himself, like other Jesuit astronomers after 1620, adhered to the system of the universe proposed by Tycho Brahe, in which the inner planets revolved around the Sun, but the Sun revolved around the Earth.
	shl.stanford.edu /Eyes/kircher/cosmology.html (377 words)

	Correspondence Lesson #7
		In the last lesson I tried to show how well Aristotle's theory of the elements and their motions fit in with Ptolemy's quantitative astronomical theory, which predicted where each of the seven principal heavenly bodies would be at any time of any year.
		the phases of Venus as predicted by (a) the Ptolemaic system (b) the Copernican system, and (c) as observed with a low-power telescope.
		The earth was stationary in the center and the sun revolved around it (as in Ptolemy's system), but all of the planets orbited around the sun (as in Copernicus' model).
	www.indiana.edu /~koertge/X200GCorr7.html (1943 words)

	geocentric system -- Britannica Concise Encyclopedia - Your gateway to all Britannica has to offer!
		More results on "geocentric system" when you join.
		The Ptolemaic system is a geocentric cosmology; that is, it starts by assuming that the Earth is stationary and at the centre of the universe.
		Brief biography of this German astronomer and scientist who discovered three laws of planetary motions which challenged the geocentric theory and proved that sun is the center of the solar system.
	concise.britannica.com /ebc/article-9036445 (848 words)

	Longomontanus (Site not responding. Last check: 2007-10-16)
		Havingleft the island of Hven with his master, he obtained his discharge at Copenhagen on June 1, 1597, in order to study at some Germanuniversities.
		He visited Frauenburg, where Copernicus had made his observations, took amasters degree at Rostock, and at Copenhagen found apatron in Christian Friis,chancellor of Denmark, who employed him in his household.
		King Christian IV of Denmark, to whom he dedicated hisAstronomia Danica, an exposition of the Tychonic system of the world, conferred upon him the canonry of Lunden in Schleswig.
	www.therfcc.org /longomontanus-43346.html (452 words)

	Phil 221
		Study Kuhn’s diagram (on CR 202) of the Tychonic system carefully and copy it on a blank page.
		On the same page, draw a corresponding diagram of the Copernican system, marking the directions of each motion with arrows.
		By considering how the Tychonic system is generated by transforming the Copernican system (CR 202-4), explain the direction of the arrows in Kuhn’s diagram of the Tychonic system.
	web.ics.purdue.edu /~curd/QQ6.html (521 words)

	Quantum and Cosmos II (Site not responding. Last check: 2007-10-16)
		This did not enable one to decide between the Copernican system, in which everything goes round the Sun, and the Tychonic (Tycho Brahe) one in which everything but the Earth (and Moon) goes round the Sun which in turn goes round the Earth.
		Most astronomers of the time in fact favoured the Tychonic system.
		Prima facie, Copernicanism was in contradiction with Scripture, and in 1616 Galileo was given some kind of secret, but official, warning that he was not to defend Copernicanism.
	www.kurdmedia.com /eim/hamid/scientist/Galillo.htm (731 words)

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