Geometry.Net - Scientists: Ptolemy

Egypt: Rulers, Kings And Pharaohs Of Ancient Egypt: Ptolemy II Philadelphus
Egypt Rulers, Kings and Pharaohs of Ancient Egypt including all dynastiesthrough the Greek Roman period ptolemy II Philadelphus.
http://www.touregypt.net/32dyn02.htm

Extractions: Ptolemy II Philadelphus, which means 'Brother/Sister-loving', was the second ruler of the Ptolemaic Dynasty. His construction efforts included that of building the canal that linked the Nile to the Gulf of Suez. He was married to his full sister Arsinoe II. He also began a tradition of a four-yearly celebration to honor his father. It was intended to have a status equal to the Olympic games. According to the "Letter of Aristeas", Ptolemy II requested 70 Jewish scholars come from Jerusalem to translate the Pentateuch into a Greek version to be placed into the Great Library collection. He died on January 29, 246 BC.
PTOLEMY'S GEOGRAPHY
The Geography of ptolemy. The British Section. ptolemy's Map of the BritishIsles. Above map plotted from the coordinates given in the following text.
http://www.roman-britain.org/ptolemy.htm

Extractions: I know that I am mortal and the creature of a day: but when I search out the massed wheeling circles of the stars, my feet no longer touch the earth, but, side by side with Zeus himself, I take my fill of ambrosia, the food of the gods. P TOLEMY Claudius Ptolemaeus was a celebrated geographer and astrologer who flourished between the reigns of Hadrian and Antonine in the second century AD. A greek by descent, he was a native of Alexandria in Egypt, and became known as the most wise and learned man of his time. He published several books on astronomy, including The Almagest which gave the positions of 1022 fixed stars by latitude and longitude, his discovery of the precession of the equinoxes , and also expounded an Earth-centred view on the workings of the universe based on epicycles - the Ptolemaic System - which was to remain unchallenged until the Polish astronomer Nicolaus Copernicus published his theory on a Sun-centred universe, the now-familiar Solar System, in AD1543.
Encyclopædia Britannica
Visit Britannica Store, Encyclopædia Britannica, ptolemy EncyclopædiaBritannica Article. Virtually nothing is known about ptolemy's,
http://www.britannica.com/eb/article?eu=63344
Ptolemy, Almagest, 1515
2. ptolemy, Claudius. Almagestum. Venice, 1515. In the next to last columnptolemy assigns a magnitude to the stars, with 1 being the brightest.
http://www.lhl.lib.mo.us/pubserv/hos/stars/pto.htm

Extractions: Although star maps are the focus of this exhibition, it is important to recognize that star maps were based on star catalogs, and the principal catalog used for star maps until 1600 was that compiled by Claudius Ptolemy in the second century A.D. This catalog contains the positions of 1028 stars, and it first appeared in print in this edition of Ptolemy's authoritative Almagest , the basic ancient work on astronomical theory. The page displayed shows the stars in the constellation Orion. In the next to last column Ptolemy assigns a magnitude to the stars, with "1" being the brightest. In a detail of the catalog we can see, near the end of the Orion entry, a description of a first-magnitude starthis is Rigel, the bright star in the heel of Orion. If we compare Ptolemy's catalog of the stars of Orion with the image of Orion in the 1482 edition of Hyginus , we see there is absolutely no correlation at all. Thus it is not strictly correct to call the Hyginus illustrations star "maps." Nevertheless, they are the visual medium out of which true star maps would evolve in the mid sixteenth century.
Ptolemy And His Geography
ptolemy and his Geography. ptolemy is by far the most important GrecoRomanwriter on the physical sciences whose works have come down to us.
http://www.chass.utoronto.ca/~ajones/ptolgeog/

Extractions: More information about the book Ptolemy is by far the most important Greco-Roman writer on the physical sciences whose works have come down to us. Among his writings are major treatises on astronomy, geography, music theory, visual perception, and astrology. The aim of this website is to provide accurate and up-to-date information about Ptolemy's life and works, with special emphasis on his influential book on cartography, the Geography Ptolemy The Geography Website content and design: Alexander Jones. ( enquiries
Ptolemy From FOLDOC
ptolemy. Because of this, ptolemy can be used to model entire systems.In addition, ptolemy now has code generation capabilities.
http://wombat.doc.ic.ac.uk/foldoc/foldoc.cgi?Ptolemy
Ptolemy Ptolémée Ptolemaeus - Iconography Of His Portrait - Iconographie
Translate this page Cette page sera affichée dans les navigateurs non-cadres. Sélectionnez cemode afin de personnaliser la page pour les navigateurs incompatibles.
http://www.er.uqam.ca/nobel/r14310/Ptolemy/
Ptolemy Biography
Links. Personalities Tour (Next). Previous. ptolemy Tour (Next). GeneralPages. Home. Index. ptolemy. In the Syntaxis (or Almagest), ptolemy
http://www.hps.cam.ac.uk/starry/ptolemy.html

Extractions: Personalities Tour (Next) Previous Ptolemy Tour (Next) Ptolemy Pages General Pages Home Index In the Syntaxis (or Almagest ), Ptolemy (second century A.D.) synthesised mathematical astronomy into a coherent whole which rendered his predecessors obsolete and would dominate Western and Islamic thought until the sixteenth century. He also wrote works on astrology, geography, optics and music. Large image (123K). Very Large image (1.2M). Nothing reliable is known of Claudius Ptolemy's life that cannot be deduced from his surviving works; only a few brief and unsupported biographical statements are made by much later sources. 'Claudius' suggests he held Roman citizenship, 'Ptolemy' that he was of Greek descent and lived in Egypt. The astronomical observations that he listed as having himself made cover the period 127-141 AD, from which it may be inferred that he was active in the first and into the second half of the second century AD, and all of those observations are listed as made in Alexandria, so it is likely that he lived in or near that city, still a great centre of learning at that time. In the Middle Ages, before the twelfth century, when his work was being discovered and studied in detail by Islamic scholars, little more than his name was remembered in the Latin West; as early as the Encyclopedia of Isidore of Seville (c.600 AD) he was confused with the dynasty of Ptolemies who had ruled Egypt after Alexander the Great, and from that sprang an iconographic tradition, lasting a thousand years, in which Ptolemy was regularly represented wearing a crown.
Ptolemy On Astrology
ptolemy Tour (Next). Previous. ptolemy on Astrology. ptolemy using a quadrant andpointing to the earth, to indicate the dependence of geography on astronomy.
http://www.hps.cam.ac.uk/starry/ptolastrol.html

Extractions: Astrology Tour (Next) Previous Astrology Pages Astrology Islamic Astrolabes Copernicus Hipparchus ... Previous Ptolemy Pages Ptolemy Astrology Calendar Reform Cosmology ... Index Ptolemy using a quadrant and pointing to the earth, to indicate the dependence of geography on astronomy. Large image (60K). Very large image (1.5M). Ptolemy's treatise on astrology, the Tetrabiblos , was the most popular astrological work of antiquity and also enjoyed great influence in the Islamic world and the medieval Latin West. That it did not quite attain the unrivalled status of the Syntaxis was perhaps because it did not cover some popular areas of the subject, particularly 'horary astrology' (interpreting astrological charts for a particular moment to determine the outcome of a course of action to be initiated at that time). The great popularity that the Tetrabiblos did possess might be attributed to its nature as an exposition of the art of astrology and as a compendium of astrological lore, rather than as a manual. It speaks in general terms, avoiding illustrations and details of practice. Ptolemy was concerned to defend astrology by defining its limits, compiling astrological data that he believed was reliable and dismissing practices (such as considering the numerological significance of names) that he believed to be without sound basis. Much of the content of the Tetrabiblos may well have been collected from earlier sources; Ptolemy's achievement was to order his material in a systematic way, showing how the subject could, in his view, be rationalised. It is, indeed, presented as the second part of the study of astronomy of which the
Ptolemy
ptolemy (100 170 AD). ptolemy wrote a valuable history of previousobservations called the Almagest . He performed many experiments
http://astrosun.tn.cornell.edu/teach/astro201/ptolemy.htm

Extractions: Ptolemy wrote a valuable history of previous observations called the "Almagest". He performed many experiments on optics and realized that starlight is refracted in the Earth's atmosphere. However, his system of planetary motions was a major blunder, and unfortunately, it was adopted for nearly 1400 years. The Earth is round, stationary and very small relative to the celestial sphere of the sky. The stars are fixed points of light inside the celestial sphere. Day and night result from the rotation of the entire celestial system around the fixed, nonrotating Earth. The planets moved on small circular paths, called epicycles . The centers of these epicycles move around the earth of other circular paths, called deferents . The combination of the planetary motions along the epicycles and deferents produces the observed wandering of the planets among the stars, including the retrograde motion
Ptolemy
It was ptolemy Soter who founded the Ptolemaic Dynasty that ruled the country forthe next 300 years. ptolemy, however, wanted complete control of the country.
http://www.horus.ics.org.eg/html/ptolemy.html

Extractions: I t was Ptolemy Soter who founded the Ptolemaic Dynasty that ruled the country for the next 300 years. Ptolemy, who had been Alexanders boyhood friend, acted as the satrap of Egypt for Alexanders two immediate successors - Philip, his brother, and Alexander IV, his son. But both were murdered, and Ptolemy ruled as virtual king, answerable only to Perdiccas, Alexanders regent. Ptolemy, however, wanted complete control of the country. In order to gain political and religious advantage, Ptolemy ordered his men to seize Alexanders body and bury it in Alexandria. P erdiccas, who wanted to bury Alexanders body in Macedonia, was furious and he immediately marched against Ptolemy but he was defeated. When the turmoil ended, Ptolemy had added Palestine and Lower Syria to the Egyptian Empire. In order to forge a link with the old line of pharaohs, he married the daughter of Nectanebo II, and began the usual pharaonic ritual of building temples, towns, and monuments. The best known of them was the Pharos, or lighthouse, of Alexandria, which became one of the Seven Wonders of the ancient world. Sources
- Great Books -
Claudius ptolemy (c. 85c. 165), Brief Biography Claudius Ptolemaeus betweenthem. ptolemy also wrote several other books. In his
http://www.malaspina.com/site/person_961.asp

Extractions: Claudius Ptolemaeus (A.D. circa 85 - circa 165), known in the English language as Ptolemy, was a Greek astronomer who lived in Alexandria in Egypt. Ptolemy was the author of the astronomical treatise which is now known as the Almagest (although that was not its original name). In this work he formulated a geocentric model of the solar system which remained the generally accepted model in the Western and Arab worlds for more than 1300 years. The Almagest also contains a star catalogue. Its list of 48 constellations is ancestral to the modern system of constellations, but unlike the modern system there were gaps between them. Ptolemy also wrote several other books. In his Geography he attempted to map the known world and describe its peoples, although the results are often very inaccurate due to the absence of reliable data and his willingness to identify ethnic groups based on hearsay and folklore. In his Optics , a work which survives only in a poor Arabic translation, he writes about properties of light, including reflection, refraction and colour. His other works include Planetary Hypothesis Planisphaerium and Analemma Ptolemy's work as a geographer is discussed below. Their contributions to pure mathematics, however, require to be noticed here. Of these the chief is the foundation of trigonometry, plane and spherical, including the formation of a table of chords, which served the same purpose as our table of sines. This branch of mathematics was created by
Ptolemy
Similar pages ptolemy's Theoremptolemy's Theorem. Remark. ptolemy of Alexandria (~100168) gave the name to theptolemy's Planetary theory which he described in his treatise Almagest.
http://www.windows.umich.edu/people/ancient_epoch/ptolemy.html

Extractions: Ptolemy was a Greek astronomer who lived between 85-165 A.D. He put together his own ideas with those of Aristotle and Hipparchus and formed a unified model of the universe . Ptolemy believed that the Earth was at the center of the universe and all other heavenly bodies circled it, a view which held for 1400 years until the time of Copernicus Ptolemy is also famous for his work in geography. Courtesy of The Bettmann Archive Ptolemy was a Greek astronomer who lived between 85-165 A.D. He put together his own ideas with those of Aristotle and Hipparchus and formed the geocentric theory. This theory states that the Earth was at the center of the universe and all other heavenly bodies circled it, a model which held for 1400 years until the time of Copernicus Ptolemy is also famous for his work in geography. He was the first person to use longitude and latitude lines to identify places on the face of the Earth
Ptolemy
ptolemy. The Aristotelian system was modified by Hipparchus whoseideas were popularized and perfected by ptolemy. In his treatise
http://phyun5.ucr.edu/~wudka/Physics7/Notes_www/node37.html

Extractions: Next: From the Middle Ages Up: Aristotle and Ptolemy Previous: The motion according to The Aristotelian system was modified by Hipparchus whose ideas were popularized and perfected by Ptolemy. In his treatise the Almagest (``The Great System'') Ptolemy provided a mathematical theory of the motions of the Sun, Moon, and planets. Ptolemy vision (based on previous work by Hipparchus) was to envision the Earth surrounded by circles, on these circles he imagined other (smaller) circles moving, and the planets, Sun, etc. moving on these smaller circles. This model remained unchallenged for 14 centuries. The system of circles upon circles was called a system of epicycles (see Fig. ). It was extremely complicated (requiring several correction factors) but it did account for all the observations of the time, including the peculiar behavior of the planets as illustrated in Fig. . The Almagest was not superseded until a century after Copernicus presented his heliocentric theory in Copernicus' De Revolutionibus of 1543.
Ptolemy
Translate this page ptolemy, ptolemy est un logiciel de conception graphique de systèmesde traitement du signal ou de l'image. C'est un logiciel libre
http://www.freealter.com/fr/Services/Support/ptolemy.html

Extractions: Ptolemy Ptolemy est un logiciel de conception graphique de systèmes de traitement du signal ou de l'image. C'est un logiciel libre complexe développé à l'université de Berkeley et qui se compare à des logiciels commerciaux dont le coût est de plusieurs centaines de kF. Cette affirmation n'est pas faite au hasard, elle est le résultat de 3 mois d'étude comparative sur 3 logiciels (2 commerciaux et Ptolemy) à partir d'un algorithme de traitement vidéo écrit en C de 3000 lignes. La version que nous installons a été légèrement améliorée en particulier en ce qui concerne les capacités de débug pour les blocs ajoutés par un utilisateur final. L'utilisateur dispose alors d'un environnement entièrement graphique de conception et de débug. Les gains de productivité liés à la réutilisation des blocs sont immédiats. Qui plus est, Ptolemy encourage la documentation des programmes. Un schéma algorithmique est de toute façon plus simple et plus parlant qu'un listing. Siglab PTOLEMY environnement graphique de développement pour le traitement du signal et d'images
Ptolemy I
ptolemy I. A general in Alexander the Great's army, ptolemy I was Kingof Egypt from 323 to 283 BCE and founded the Ptolemic Dynasty.
http://emuseum.mnsu.edu/prehistory/egypt/history/people/ptolemy.html

Extractions: 323 - 283 B.C.E. A general in Alexander the Great 's army, Ptolemy I was King of Egypt from 323 to 283 B.C.E. and founded the Ptolemic Dynasty . Some of the things which he accomplished were making Alexandria the capital and cultural center of the kingdom as well as founding the Great Library of Alexandria. The picture at the right are Limestone paintings from the cult chapel of Ptolemy I Soter which we are using thanks to the Museum of Fine Arts in Houston, Texas. Ptolemy I is also called Ptolemy I Soter in many books.
Ptolemy
ptolemy. ptolemy was a Greek astronomer who of the Earth. Picture ofptolemy Courtesy of The Bettmann Archive. Last modified prior
http://www.windows.ucar.edu/tour/link=/people/ancient_epoch/ptolemy.html

Extractions: Ptolemy was a Greek astronomer who lived between 85-165 A.D. He put together his own ideas with those of Aristotle and Hipparchus and formed the geocentric theory. This theory states that the Earth was at the center of the universe and all other heavenly bodies circled it, a model which held for 1400 years until the time of Copernicus Ptolemy is also famous for his work in geography. He was the first person to use longitude and latitude lines to identify places on the face of the Earth
Ptolemy
NEWS. MUSIC. Metem Krew
http://www.metempsychosis.com/ptolemy/
Ptolemy - The Ptolemies
ptolemy ~ The Ptolemies. ptolemy Claudius Ptolemaeus, Ptolomaeus, Klaudios Ptolemaios,Ptolemeus - lived in Alexandria, Egypt from approx. ptolemy's Geography.
http://www.crystalinks.com/ptolemy.html

Extractions: Ptolemy - Claudius Ptolemaeus, Ptolomaeus, Klaudios Ptolemaios, Ptolemeus - lived in Alexandria, Egypt from approx. 87 -150 AD. Very little is known about his personal life. He was an astronomer, mathemetician and geographer. He made astronomical observations from Alexandria in Egypt during the years AD 127-41. In fact the first observation which we can date exactly was made by Ptolemy on 26 March 127 while the last was made on 2 February 141. It was claimed by Theodore Meliteniotes in around 1360 that Ptolemy was born in Hermiou (which is in Upper Egypt rather than Lower Egypt where Alexandria is situated) but since this claim first appears more than one thousand years after Ptolemy lived, it must be treated as relatively unlikely to be true. In fact there is no evidence that Ptolemy was ever anywhere other than Alexandria. His name, Claudius Ptolemy, is of course a mixture of the Greek Egyptian 'Ptolemy' and the Roman 'Claudius'. This would indicate that he was descended from a Greek family living in Egypt and that he was a citizen of Rome, which would be as a result of a Roman emperor giving that 'reward' to one of Ptolemy's ancestors. He codified the Greek geocentric view of the universe, and rationalized the apparent motions of the planets as they were known in his time. That theory was presented in such a form that it prevailed for 1400 years.
Untitled
answered on the frequently asked questions page (and about the other planetary imagefinders),please contact the author, Bob Kanefsky Kanef@ptolemy.ARC.NASA
http://ic.arc.nasa.gov/ic/projects/bayes-group/Atlas/Mars/kanefsky-home.html

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