Epicycle The geometry of epicycles was perfected by hipparchus of rhodes at some time around125 BC, 185 years after the birth of Aristarchus of Samos, the inventor of http://gd.tuwien.ac.at/linuxcommand.org/man_pages/epicycle1.html
Extractions: XScreenSaver(1) XScreenSaver(1) epicycle - draws a point moving around a circle which moves around a cicle which... epicycle [-display host:display.screen ] [-root] [-window] [-mono] [-install] [-noinstall] [-visual viz ] [-colors N ] [-foreground name ] [-color-shift N ] [-delay microseconds ] [-holdtime seconds ] [-linewidth N N N number number ] [-harmonics N ] [-timestep number probabil- ity number number The epicycle program draws the path traced out by a point on the edge of a circle. That circle rotates around a point on the rim of another circle, and so on, several times. The random curves produced can be simple or complex, convex or concave, but they are always closed curves (they never go in indefinitely). You can configure both the way the curves are drawn and the way in which the random sequence of circles is generated, either with command- line options or X resources. -display host:display.screen
Lecture 6: Motions Of The Stars Halley in 1718 for three bright stars Sirius, Aldebaran, and Arcturus, by comparinghis measurements of their positions to those of hipparchus of rhodes (300BC http://www-astronomy.mps.ohio-state.edu/~pogge/Ast162/Unit1/motions.html
Extractions: The great distances to the stars means that their apparent motions across the sky are very small during a human lifetime. Proper Motions Apparent angular motion of nearby stars with respect to more distant stars. These reflect the true motion of the stars relative to the Sun through space. Proper motions are Cumulative The effect of proper motions build up over time... The longer you wait, the greater the apparent angular motion is Modern measurement of proper motions: Example: Consider a star with a proper motion of 0.1 arcsec/year:
Arapacana Press hipparchus of rhodes (floruit 150 bc) quadrupled the Callippic Cycle, and therebymanaged to calculate the length of the tropical year at 365.242 days, nearly http://www.arapacana.com/Glossary/Y.htm
Extractions: Genealogical Glossary Glossemata Genealogicæ In Alphabetical Order Y (y) : [anthropology] younger, with respect to the ego; a kin type determinant used to modify a kinship dimension. Opp. (e). Y : [Ogham Q-Celtic] idra -y : -ia : [Gk] quality of. -y : - ia : quality, state, condition. -y : - ium : action, the result of action. Y chromosome : [1923] a sex chromosome unique to male cells. The male will typically have a pair of two dissimilar sex chromosomes, namely X and Y, in each of its cells. Physically, a Y chromosome seems to be half the size of other chromosomes, and seems to have its centromere biased toward one end, so it gives the appearance of the letter Y during mitosis, whereas all the other chromosomes exhibit X shapes. Sex chromosomes can transmit physical and behavioral genes, but the transmission of traits belongs almost exclusively to the domain of the X chromosome, which is common to both sexes. The main duty of the Y chromosome is the endowment of male sexuality or maleness. One gene that promotes hair growth in the ear canal happens to be carried by the Y chromosome, but very few other specific traits have been traced to the Y chromosome. Opp. X chromosome. Y the letter : Ny, Gn, Ng.
Conservation Treatment Awards West Region history. The six scientists depicted are hipparchus of rhodes, Copernicus,Kepler, Galileo, Isaac Newton, and William Herschel. Six http://www.heritagepreservation.org/PROGRAMS/SOS/CTA/West.htm
Extractions: Located at the internationally famous Griffith Observatory, Astronomer's Monument (1934) stands 25 feet tall and includes statues of important scientists in world history. The six scientists depicted are Hipparchus of Rhodes, Copernicus, Kepler, Galileo, Isaac Newton, and William Herschel. Six different artists—Roger Noble Burnham, Djey el Djey, Arnold Forester, Archibald Garner, Gordon Newell, and George Stanley—were hired to sculpt the figures. Stanley also designed the Academy Award or "Oscar." Griffith Observatory and the City of Los Angeles are the owners. The Friends of the Observatory is the applicant. The Hugo Reid Family Scottish-born Hugo Reid was one of the first English-speaking immigrants to live in southern California. Elected as a delegate to the California Constitutional Convention, Reid was one of the signatories of the state's first Constitution. Perhaps he is best known for the more than 20 letters he wrote to the LA Star in 1851, which described and thus preserved the beliefs, customs, and traditions of the local Native American tribes. Married to a Native American, he adopted her two children at a time when many other immigrants were marrying into prominent Spanish-speaking families.
Popular Fallacies In The History Of Science - Numericana At the exact same time however, hipparchus of rhodes (190120 BC) reverted to thegeocentric system, and was instrumental in killing the heliocentric idea cf. http://home.att.net/~numericana/answer/record.htm
Extractions: Did the idea of an heliocentric system originate with Copernicus? No. The idea is actually far more ancient. Although Heraclides of Pontus (387 BC - 312 BC) deserves great credit for first suggesting that the Earth rotates around an axis, he did not yet place the Sun at the center of the Solar system (in spite of what some reports are still stating).
Astronomy Lecture Notes - Early History hipparchus of rhodes (190120 BC) Wrote a star catalog in which he introduced themagnitude system also calculated the length of the year and discovered the http://www.olemiss.edu/courses/astr103/Topics-Introduction/Ancient-N.html
Science Technology Summary topHipparchus the Greek. hipparchus of rhodes was a Greek astronomerand geographer who lived circa 150 BC. During his life, Hipparchus http://spdxdev.estec.esa.nl/science-e/www/object/index.cfm?fobjectid=28820
Mathem_abbrev Heisenberg, Werner Heraclides of Pontus Heron of Alexandria Herschel, CarolineHerschel, John Higman, Graham Hilbert, David hipparchus of rhodes Hippias of http://www.pbcc.cc.fl.us/faculty/domnitcj/mgf1107/mathrep1.htm
Extractions: Mathematician Report Index Below is a list of mathematicians. You may choose from this list or report on a mathematician not listed here. In either case, you must discuss with me the mathematician you have chosen prior to starting your report. No two students may write a report on the same mathematician. I would advise you to go to the library before choosing your topic as there might not be much information on the mathematician you have chosen. Also, you should determine the topic early in the term so that you can "lock-in" your report topic!! The report must include: 1. The name of the mathematician. 2. The years the mathematician was alive. 3. A biography. 4. The mathematician's major contribution(s) to mathematics and an explanation of the importance. 5. A historical perspective during the time the mathematician was alive.
Extractions: < 5o. * Ptolemy still used physical, heavenly spheres and so the universe was finite, with the stars approximately 20000 earth radii away (assuming an earth-moon distance of 59 earth radii - though this model had no set distance scale.) * Even after it was discredited, Ptolemy's model was still in use - because it did predict the locations of the planets rather well.
The Gurus Love You. MAT300. Unenlightened Soul. Do you think hipparchus of rhodes is a good choice foran eight page paper about his life and works? The Gurus Respond Ellen Feiss. http://www.truemeaningoflife.com/oldwisdom.php?topid=33137&responses=2
TITLE Although it is possible to use the Armillary for making observations (Eratosthenes204BC catalogued more than 700 stars, and hipparchus of rhodes (150125BD http://world.std.com/~leep/cat003/armil.htm
Extractions: ARMILLARY SPHERE An Armillary Sphere is a model of the celestial sphere based on the Ptolemy theory of the universe with the earth being stationary at the centre. The celestial sphere is imagined as a sphere with the stars fixed onto its interior and the earth at its centre. Although we now know this to be inaccurate, it does not effect the working of the Armillary Sphere since to an observer on Earth the motion of the Sun and Stars appears the same. It is a refinement of the earlier solid celestial spheres developed by Greek scientists such as Archimedes. Being solid made it difficult to imagine the position of the Earth at the centre, consequently these spheres developed a more skeletal appearance, consisting of a series of rings and becoming known as Armillary Spheres, presumably from the Latin word 'armilla' meaning bracelet. Although it is possible to use the Armillary for making observations (Eratosthenes 204BC catalogued more than 700 stars, and Hipparchus of Rhodes (150-125BD) determined distance from the Earth to the Sun and produced a complete star catalogue for his latitude) in practice this is difficult. However with the advent of stereographic projection the Armillary led to the development of the more accurate and useful anaphoric clock and the Astrolabe.
Spice Maps Background His work in astronomy was largely based on the ideas of hipparchus of rhodes (threehundred years earlier) who proposed divicding the length and breadth of the http://ias.berkeley.edu/orias/spice/textobjects/moreonmaps.htm
Extractions: (Berthon, p. 19) Map B Herodotus had travelled extensively throughout the Mediterranean and collected information about Asia. Beyond India lay unknown and uninhabited deserts..."for the Indians live the furthest towards the east and the sunrise of all the Asians with whom we are acquainted or of whom we know by hearsay. Eastwards the country of the Indians is a sandy desert." (Wheatley, p. 124) "I cannot help but laughing at the absurdity of all the mapmakersthere are plenty of themwho show Ocean running like a river round a perfectly circular earth, with Asia and Europe of the same size." Herodotus said of the three known continents (Europe, Asia, and Africa) "Europe is as long as the other two put together, and for breadth is not, in my opinion, even to be compared with them."
PSIgate - Browse Results hipparchus of rhodes This site provides a biography of the astronomerHipparchus (190120BC). The site is part of the MacTutor History http://www.psigate.ac.uk/roads/cgi-bin/psibrowse2.pl?limit=25&subject=509.2h&top
PSIgate - Physical Sciences Information Gateway Search Results of astronomy is provided with links to further information on selected key astronomers(Thales, Eratosthenes of Cyrene, hipparchus of rhodes, Euclid, Plato http://www.psigate.ac.uk/roads/cgi-bin/psisearch.pl?term1=Tycho Brahe&subject=Al
Reflections Vol20, No3, Aug 95 His better known successor, the ancient Greek astronomer hipparchus of rhodes,invented a magnitude system of stellar brightness in the second century BC. http://hsc.csu.edu.au/pta/mansw/reflections/vol21no1coupland.htm
Extractions: Indices, logarithms, and exponential functions are widely used in scientific applications of mathematics as they provide models for a variety of physical situations. We think this can provide motivating examples in the teaching of these topics. In the workshop at the conference, we first investigated some activities based on everyday situations that could be used as starting points. We also provided some information that may go beyond the current school syllabus in mathematics, but which provides interesting background knowledge for teachers. Investigations that use indices and exponential functions I. Could you be related to a famous historical figure? n the number of - grandparents you have, and g the number of generations back they are? How many years ago do you think your - grandparents were alive? Find out where they were probably living and the population of that part of the world at that time. You may be related to someone famous! You may even be related to the person sitting next to you! II The disappearing function x is the number of shakes, and
Laputan Logic - The Clockwork Computer model of planetary movement around a fixed earth devised by Apollonius of Pergaand hipparchus of rhodes (later superceded by the heliocentric model of http://www.laputanlogic.com/story/2002/10/20-83388235.html
Extractions: If you've enjoyed anything you've found here, how about clicking on one of the Google Ads below? Each click tips me about 3 cents. The clockwork computer Posted on Wednesday 23 October 2002 to Story So Far In 1900 a sponge diver called Elias Stadiatos discovered the wreck of an ancient merchant ship off the tiny island of Antikythera near Crete. The corbita , dating from the first century B.C., was heavily laden with treasure of all kinds, original bronze life-size statues, marble reproductions of older works, jewelry, wine, fine furniture and one immensely complicated scientific instrument. The Antikythera mechanism was originally housed in a wooden box about the size of a shoebox with dials on the outside and a complex clockwork assembly of gears inscribed and configured to produce solar and lunar positions in synchronization with the calendar year . By rotating a handle on its side, its owner could read on its front and back dials the progressions of the lunar and synodic months over four-year cycles. The device has been estimated to be accurate to
Extractions: Full Review "The Extraordinary Journey of Pytheas the Greek" is somewhat misnamed. Pytheas was an actual person, born Massalia (present day Marseilles), a Greek colony, in the 4th century BCE. His own account of his travels, "On the Ocean," is no longer extant. Cunliffle relies on all that is left of it, that is, in excerpts recorded in the works of such classical writers as Strabo, Pliny the Elder, and a host of others, some well-known, others as almost obscure as Pytheas himself. Pytheas claimed to have sailed to England and "walked the breadth of it." He could not measure longitude, but had a crude way of measuring latitude by measuring the sun's height at noon on the summer solstice (or subtracting the days until the solstice) with a surveying staff called a "gnomon." The idea of parallel lines of latitude would not developed for another couple centuries by one Hipparchus of Rhodes who used Pytheas' measurements in plotting places in the far north. Pytheas also had a crude way of measuring distance by sea using a rule of thumb as to how far a ship could travel per day.
Images Of Mathematicians On Postage Stamps HILBERT, David. Issued by the Democratic Republic of the Congo in 2001 hilbert1.jpg.hipparchus of rhodes. Issued by Greece hipparchus1.jpg. HRONEC, Juraj. http://jeff560.tripod.com/
Extractions: Images of Mathematicians on Postage Stamps RECENT CHANGES: On March 20, Francisco gomes_teixeira1.jpg and gomes_teixeira2.jpg were added. On March 17, lagrange.jpg, monge.jpg, and keldysh.jpg were replaced with better quality images. monge.jpg now has the block of four stamps in the set. On March 15, caratheodory.jpg and thales.jpg were replaced with higher quality images (actually both files were replaced with the same image, showing both stamps unseparated). On March 15, democ2.jpg, democ3.jpg, zu_chongzhi.jpg, zhang_heng.jpg, and nunes4.jpg were added. On March 13, avicenna7.jpg was added. On March 7, gazeta1.jpg and gazeta2.jpg were replaced with higher quality images. Thanks to Bert Jagers for these images. On Feb. 26, goldensection.jpg, moebius2.jpg, moebius3.jpg, impossible4.jpg, keldysh3.jpg, metric25.jpg, petrovic.jpg, schmidt2.jpg, calculate1.jpg, icm90.jpg, and bougainville.jpg were added. Thanks to Magnus Waller for these images. ABEL, Niels Henrik. Issued by Norway on April 6, 1929, upon the death centenary abel1.jpg
