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Pappus Of Alexandria
Pappus of Alexandria (; ; AD) was a Greek mathematics, Greek mathematician of late antiquity known for his ''Synagoge'' (Συναγωγή) or ''Collection'' (), and for Pappus's hexagon theorem in projective geometry. Almost nothing is known about his life except for what can be found in his own writings, many of which are lost. Pappus apparently lived in Alexandria, where he worked as a Mathematics education, mathematics teacher to higher level students, one of whom was named Hermodorus.Pierre Dedron, J. Itard (1959) ''Mathematics And Mathematicians'', Vol. 1, p. 149 (trans. Judith V. Field) (Transworld Student Library, 1974) The ''Collection'', his best-known work, is a compendium of mathematics in eight volumes, the bulk of which survives. It covers a wide range of topics that were part of the ancient mathematics curriculum, including geometry, astronomy, and mechanics. Pappus was active in a period generally considered one of stagnation in mathematical studies, where, to s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pappi Alexandrini
In Asteraceae, the pappus is the modified calyx_(botany), calyx, the part of an individual floret, that surrounds the base of the petal, corolla tube in flower. It functions as a dispersal mechanism for the achenes that contain the seeds. In Asteraceae, the pappus may be composed of bristles (sometimes feathery), awns, scales, or may be absent, and in some species, is too small to see without magnification. In genera such as ''Taraxacum'' or ''Eupatorium'', feathery bristles of the pappus function as a "parachute" which enables the seed to be carried by the wind. In genera such as ''Bidens'' the pappus has hooks that function in mechanical dispersal. The name derives from the Ancient Greek word ''pappos'', Latin ''pappus'', meaning "old man", so used for a plant (assumed to be an ''Erigeron'' species) having bristles and also for the woolly, hairy seed of certain plants. The pappus of the Taraxacum, dandelion plays a vital role in the wind-aided dispersal of its seeds. By cr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Suda
The ''Suda'' or ''Souda'' (; ; ) is a large 10th-century Byzantine Empire, Byzantine encyclopedia of the History of the Mediterranean region, ancient Mediterranean world, formerly attributed to an author called Soudas () or Souidas (). It is an encyclopedic lexicon, written in Medieval Greek, Greek, with 30,000 entries, many drawing from ancient sources that have since been lost, and often derived from Christianity in the Middle Ages, medieval Christian compilers. Title The exact spelling of the title is disputed. The transmitted title (''paradosis'') is "Suida", which is also attested in Eustathius of Thessalonica, Eustathius' commentary on Homer's epic poems; several conjectures have been made, both defending it and trying to correct it in "Suda". * Paul Maas (classical scholar), Paul Maas advocated for the spelling, connecting it to the Latin verb , the second-person singular imperative of , "to sweat". * Franz Dölger also defended , tracing its origins back to Byzantine mi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Euclid's Elements
The ''Elements'' ( ) is a mathematics, mathematical treatise written 300 BC by the Ancient Greek mathematics, Ancient Greek mathematician Euclid. ''Elements'' is the oldest extant large-scale deductive treatment of mathematics. Drawing on the works of earlier mathematicians such as Hippocrates of Chios, Eudoxus of Cnidus and Theaetetus (mathematician), Theaetetus, the ''Elements'' is a collection in 13 books of definitions, postulates, propositions and mathematical proofs that covers plane and solid Euclidean geometry, elementary number theory, and Commensurability (mathematics), incommensurable lines. These include Pythagorean theorem, Thales' theorem, the Euclidean algorithm for greatest common divisors, Euclid's theorem that there are infinitely many prime numbers, and the Compass-and-straightedge construction, construction of regular polygons and Regular polyhedra, polyhedra. Often referred to as the most successful textbook ever written, the ''Elements'' has continued to be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Euclid
Euclid (; ; BC) was an ancient Greek mathematician active as a geometer and logician. Considered the "father of geometry", he is chiefly known for the '' Elements'' treatise, which established the foundations of geometry that largely dominated the field until the early 19th century. His system, now referred to as Euclidean geometry, involved innovations in combination with a synthesis of theories from earlier Greek mathematicians, including Eudoxus of Cnidus, Hippocrates of Chios, Thales and Theaetetus. With Archimedes and Apollonius of Perga, Euclid is generally considered among the greatest mathematicians of antiquity, and one of the most influential in the history of mathematics. Very little is known of Euclid's life, and most information comes from the scholars Proclus and Pappus of Alexandria many centuries later. Medieval Islamic mathematicians invented a fanciful biography, and medieval Byzantine and early Renaissance scholars mistook him for the earlier philo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diodorus Of Alexandria
Diodorus of Alexandria or Diodorus Alexandrinus was a gnomonicist, astronomer and a pupil of Posidonius. Writings He wrote the first discourse on the principles of the sundial, known as ''Analemma''. a commentary on this having later been written by Pappus of Alexandria, that is no longer extant. A small number of sentences having survived the centuries and attributed to him are known; these comment on: the differences between astronomy and natural science, the word meanings for cosmos and star, the nature of stars and the Milky Way. He was known to Eudoros. A few surviving passages might come from a commentary on Aratus. In his dealings with astronomy he was known to Marinus in his commentary on Euclid's ''Data'' containing quotes of Diodorus's opinions on the meaning of a term. See also *Alexandria *Analemma *Euclid *History of sundials A sundial is a device that indicates time by using a light spot or shadow cast by the position of the Sun on a reference scale. As the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Analemma
In astronomy, an analemma (; ) is a diagram showing the position of the Sun in the sky as seen from a fixed location on Earth at the same Solar time#Mean solar time, mean solar time over the course of a year. The change of position is a result of the shifting of the angle in the sky of the path that the Sun takes Celestial sphere, in respect to the stars (the ecliptic). The diagram resembles a lemniscate, figure eight. Globes of the Earth often display an analemma as a two-dimensional figure of equation of time ("sun fast") vs. declination of the Sun. The north–south component of the analemma results from the change in the Sun's declination due to the axial tilt, tilt of Earth's Rotation around a fixed axis, axis of rotation as it orbits around the Sun. The east–west component results from the equation of time, nonuniform rate of change of the Sun's right ascension, governed by the combined effects of Earth's axial tilt and its orbital eccentricity. An analemma can be Phot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ecumene
In ancient Greece, the term ''oecumene'' ( UK) or ''ecumene'' ( US; ) denoted the known, inhabited, or habitable world. In Greek antiquity, it referred to the portions of the world known to Hellenic geographers, subdivided into three continents: Africa, Europe, and Asia. Under the Roman Empire, it came to refer to civilization itself, as well as the secular and religious imperial administration. In present usage, it is most often used in the context of "ecumenical" and describes the Christian Church as a unified whole, or the unified modern world civilization. It is also used in cartography to describe a type of world map ('' mappa mundi'') used in late antiquity and the Middle Ages. Etymology The Greek term cited above is the feminine present middle participle of the verb (, '(I) inhabit') and is a clipped form of (, 'inhabited world').Oxford English Dictionary. "œcumene, ''n''." Greece Ancient Greek and Roman geographers knew the approximate size of the globe, but r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chorography
Chorography (from χῶρος ''khōros'', "place" and γράφειν ''graphein'', "to write") is the art of describing or mapping a region or district, and by extension such a description or map. This term derives from the writings of the ancient geographer Pomponius Mela and Ptolemy, where it meant the geographical description of regions. However, its resonances of meaning have varied at different times. Richard Helgerson states that "chorography defines itself by opposition to chronicle. It is the genre devoted to place, and chronicle is the genre devoted to time". Darrell Rohl prefers a broad definition of "the representation of space or place". Ptolemy's definition In his text of the '' Geographia'' (2nd century CE), Ptolemy defined geography as the study of the entire world, but chorography as the study of its smaller parts—provinces, regions, cities, or ports. Its goal was "an impression of a part, as when one makes an image of just an ear or an eye"; and it dealt w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pappus - Mathematicae Collectiones, 1660
Pappus may refer to: * Pappus (botany), a structure within certain flowers * ''Pappus'' (bug), a genus of insects in the tribe Mirini * Pappus of Alexandria, Greek mathematician ** Pappus's hexagon theorem, often just called 'Pappus's theorem', a theorem named for Pappus of Alexandria ** Pappus's centroid theorem, another theorem named for Pappus of Alexandria ** Pappus configuration, a geometric configuration related to 'Pappus's theorem' ** Pappus graph, a graph related to the pappus configuration See also * Papus (other) * Pappu, an Indian male given name ** Pappu (cinematographer) Sudheesh Pappu (1977/1978 – 14 November 2022), professionally credited mononymously as Pappu, was an Indian cinematographer who worked in Malayalam cinema. Early life Pappu was born in Thrippunithura, Ernakulam, Kerala. He was schooled in Ke ... (1977–2022), Indian cinematographer * ''Pappu'' (film), 1980 Indian film {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nabonassar
Nabû-nāṣir was the king of Babylon from 747 to 734 BC. He deposed a foreign Chaldean usurper named Nabu-shuma-ishkun, bringing native rule back to Babylon after twenty-three years of Chaldean rule. His reign saw the beginning of a new era characterized by the systematic maintenance of chronologically precise historical records. Both the Babylonian ChronicleTablet BM 92502 The ''Chronicle on the Reigns from Nabû-Nasir to Šamaš-šuma-ukin'' (ABC 1) lines 1 to 12. and the Ptolemaic Canon begin with his accession to the throne. He was contemporary with the Assyrian kings Aššur-nirarī V (755–745 BC) and Tiglath-Pileser III (745–727 BC), under the latter of whom he became a vassal, and the Elamite kings Humban-Tahrah I (reigned until 743 BC) and Humban-Nikaš I (742–717 BC). Attestations and possible vituperative chronicle Nothing is known of his provenance or origin, although it appears he was a native Mesopotamian. His three predecessors were from the migran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Month Of Tobi
Tobi (, ''Tōbi''), also known as Tybi (, ''Tybí'') and Tubah. (), is the fifth month of the ancient Egyptian and Coptic calendars. It lies between January 9 and February 7 of the Gregorian calendar. The month of Tobi is also the first month of the season of Proyet (Growth and Emergence) in Ancient Egypt, where the Nile floods recede and the crops start to grow throughout the land of Egypt. Name The name of the month of Tobi comes from Amso Khem, a form of the Ancient Egyptian God Amun Ra. Description Toubeh, (the ancient Tobi) : the 5th Coptic month. Corn and flax should be cleared from weeds, and land that is to be devoted to cotton, sesame, and summer cucurbita, is prepared until the 1st of Amshir. Land destined for the growth of culcas (colocasia), and sugar, should be inundated. Lands found to be uncultivable should be marked out and declared unproductive, in order that they may be exempt from taxation. The first cutting of sugar cane takes place (hasab er-rcis) -. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Almagest
The ''Almagest'' ( ) is a 2nd-century Greek mathematics, mathematical and Greek astronomy, astronomical treatise on the apparent motions of the stars and planetary paths, written by Ptolemy, Claudius Ptolemy ( ) in Koine Greek. One of the most influential scientific texts in history, it canonized a geocentric model of the Universe that was accepted for more than 1,200 years from its origin in Hellenistic Roman-era Alexandria, Alexandria, in the medieval Byzantine and Islamic Golden Age, Islamic worlds, and in Western Europe through the Middle Ages and early Renaissance until Copernicus. It is also a key source of information about ancient Greek astronomy. Ptolemy set up a public inscription at Canopus, Egypt, in 147 or 148. Norman T. Hamilton found that the version of Ptolemy's models set out in the ''Canopic Inscription'' was earlier than the version in the ''Almagest''. Hence the ''Almagest'' could not have been completed before about 150, a quarter-century after Ptolemy began ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
