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Solar Observation
Solar observation is the scientific endeavor of studying the Sun and its behavior and relation to the Earth and the remainder of the Solar System. Deliberate solar observation began thousands of years ago. That initial era of direct observation gave way to telescopes in the 1600s followed by satellites in the twentieth century. Prehistory Stratigraphy, Stratigraphic data suggest that solar cycles have occurred for hundreds of millions of years, if not longer; measuring varves in precambrian sedimentary rock has revealed repeating peaks in layer thickness corresponding to the cycle. It is possible that the early atmosphere on Earth was more sensitive to solar irradiation than today, so that greater glacial melting (and thicker sediment deposits) could have occurred during years with greater sunspot activity. This would presume annual layering; however, alternative explanations (diurnal) have also been proposed. Analysis of tree rings revealed a detailed picture of past solar cycle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar System
The Solar SystemCapitalization of the name varies. The International Astronomical Union, the authoritative body regarding astronomical nomenclature, specifies capitalizing the names of all individual astronomical objects but uses mixed "Solar System" and "solar system" structures in theinaming guidelines document. The name is commonly rendered in lower case ('solar system'), as, for example, in the ''Oxford English Dictionary'' an''Merriam-Webster's 11th Collegiate Dictionary''. is the gravity, gravitationally bound system of the Sun and the objects that orbit it. It Formation and evolution of the Solar System, formed 4.6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud. The solar mass, vast majority (99.86%) of the system's mass is in the Sun, with most of the Jupiter mass, remaining mass contained in the planet Jupiter. The four inner Solar System, inner system planets—Mercury (planet), Mercury, Venus, Earth and Mars—are terrest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gan De
Gan De (; fl. 4th century BC), also known as the Lord Gan (Gan Gong), was an ancient Chinese astronomer and astrologer born in the State of Qi. Along with Shi Shen, he is believed to be the first in history known by name to compile a star catalogue, preceded by the anonymous authors of the early Babylonian star catalogues and followed by the Greek Hipparchus who is the first known in the Western tradition of Hellenistic astronomy to have compiled a star catalogue. He also made observations of the planets, particularly Jupiter. His writings are lost, but some of his works' titles and fragments quoted from them are known from later texts. Gan De may have been the first to describe one of the Galilean moons of Jupiter, usually invisible without the aid of telescopes. In the 20th century, a fragment of Gan's work, in a later compilation of astronomical texts, was identified by Xi Zezong as describing a naked-eye observation of either of the two largest and brightest moons, Ganymede ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frisians
The Frisians are a Germanic ethnic group native to the coastal regions of the Netherlands and northwestern Germany. They inhabit an area known as Frisia and are concentrated in the Dutch provinces of Friesland and Groningen and, in Germany, East Frisia and North Frisia (which was a part of Denmark until 1864). The name is probably derived from frisselje' (to braid, thus referring to braided hair). The Frisian languages are spoken by more than 500,000 people; West Frisian is officially recognised in the Netherlands (in Friesland), and North Frisian and Saterland Frisian are recognised as regional languages in Germany. History The ancient Frisii enter recorded history in the Roman account of Drusus's 12 BC war against the Rhine Germans and the Chauci. They occasionally appear in the accounts of Roman wars against the Germanic tribes of the region, up to and including the Revolt of the Batavi around 70 AD. Frisian mercenaries were hired to assist the Roman invasion ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Harriot
Thomas Harriot (; – 2 July 1621), also spelled Harriott, Hariot or Heriot, was an English astronomer, mathematician, ethnographer and translator to whom the theory of refraction is attributed. Thomas Harriot was also recognized for his contributions in navigational techniques, working closely with John White to create advanced maps for navigation. While Harriot worked extensively on numerous papers on the subjects of astronomy, mathematics and navigation, he remains obscure because he published little of it, namely only ''The Briefe and True Report of the New Found Land of Virginia'' (1588). This book includes descriptions of English settlements and financial issues in Virginia at the time. He is sometimes credited with the introduction of the potato to the British Isles. Harriot was the first person to make a drawing of the Moon through a telescope, on 5 August 1609, about four months before Galileo Galilei. After graduating from St Mary Hall, Oxford, Harriot traveled to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johannes Kepler
Johannes Kepler (; ; 27 December 1571 – 15 November 1630) was a German astronomer, mathematician, astrologer, natural philosopher and writer on music. He is a key figure in the 17th-century Scientific Revolution, best known for his laws of planetary motion, and his books ''Astronomia nova'', ''Harmonice Mundi'', and ''Epitome Astronomiae Copernicanae''. These works also provided one of the foundations for Newton's theory of universal gravitation. Kepler was a mathematics teacher at a seminary school in Graz, where he became an associate of Prince Hans Ulrich von Eggenberg. Later he became an assistant to the astronomer Tycho Brahe in Prague, and eventually the imperial mathematician to Emperor Rudolf II and his two successors Matthias and Ferdinand II. He also taught mathematics in Linz, and was an adviser to General Wallenstein. Additionally, he did fundamental work in the field of optics, invented an improved version of the refracting (or Keplerian) telescope, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Giordano Bruno
Giordano Bruno (; ; la, Iordanus Brunus Nolanus; born Filippo Bruno, January or February 1548 – 17 February 1600) was an Italian philosopher, mathematician, poet, cosmological theorist, and Hermetic occultist. He is known for his cosmological theories, which conceptually extended the then novel Copernican model. He proposed that the stars were distant suns surrounded by their own planets, and he raised the possibility that these planets might foster life of their own, a cosmological position known as cosmic pluralism. He also insisted that the universe is infinite and could have no "center". While Bruno began as a Dominican friar, during his time in Geneva he embraced Calvinism. Bruno was later tried for heresy by the Roman Inquisition on charges of denial of several core Catholic doctrines, including eternal damnation, the Trinity, the divinity of Christ, the virginity of Mary, and transubstantiation. Bruno's pantheism was not taken lightly by the church, nor was his teac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sun In Samuel Dunn Wall Map Of The World
The Sun is the star at the center of the Solar System. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core. The Sun radiates this energy mainly as light, ultraviolet, and infrared radiation, and is the most important source of energy for life on Earth. The Sun's radius is about , or 109 times that of Earth. Its mass is about 330,000 times that of Earth, comprising about 99.86% of the total mass of the Solar System. Roughly three-quarters of the Sun's mass consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen, carbon, neon, and iron. The Sun is a G-type main-sequence star (G2V). As such, it is informally, and not completely accurately, referred to as a yellow dwarf (its light is actually white). It formed approximately 4.6 billionAll numbers in this article are short scale. One billion is 109, or 1,000,000,000. years ago from the gravitat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Novgorod First Chronicle
The Novgorod First Chronicle (russian: Новгородская первая летопись) or The Chronicle of Novgorod, 1016–1471 is the most ancient extant Old Russian chronicle of the Novgorodian Rus'. It reflects a tradition different from the Primary Chronicle of the Kievan Rus'. The later editions of the chronicle reflect the lost Primary Kievan Code (Начальный Киевский свод) of the late 11th century, which contained information not present in the later Primary Chronicle. The earliest extant copy of the chronicle is the so-called Synod Scroll, dated to the second half of the 13th century. First printed in 1841, it is currently preserved in the State Historical Museum. It is the earliest known manuscript of a major East Slavic chronicle, predating the Laurentian Codex of the Primary Chronicle by almost a century. In the 14th century, the Synod Scroll was continued by the monks of the Yuriev Monastery in Novgorod. Other important copies of the Novgo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leo Diaconus
Leo the Deacon ( el, Λέων ο Διάκονος) (born c. 950) was a Byzantine Greek historian and chronicler. He was born around 950 at Kaloe in Asia Minor, and was educated in Constantinople, where he became a deacon in the imperial palace. While in Constantinople he wrote a history covering the reigns of Romanos II, Nikephoros II, John Tzimiskes, and the early part of the reign of Basil II. Often his observations were based on his experiences as an eyewitness to events. His writing style has been described as "Classical", as he employed language reminiscent of the poet Homer and other ancient Greek historians such as Agathias. Leo is particularly well known for his eyewitness description of Sviatoslav I of Kiev, who invaded Bulgaria in 969 and fought against Byzantine Imperial forces over its territory. References *''The History of Leo the Deacon: Byzantine military expansion in the tenth century''. Introd., transl., and annotations by Alice-Mary Talbot and Denis F. Sullivan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Cairo
Cairo University ( ar, جامعة القاهرة, Jāmi‘a al-Qāhira), also known as the Egyptian University from 1908 to 1940, and King Fuad I University and Fu'ād al-Awwal University from 1940 to 1952, is Egypt's premier public university. Its main campus is in Giza, immediately across the Nile from Cairo. It was founded on 21 December 1908;"Brief history and development of Cairo University." Cairo University Faculty of Engineering. http://www.eng.cu.edu.eg/CUFE/History/CairoUniversityShortNote/tabid/81/language/en-US/Default.aspx however, after being housed in various parts of Cairo, its faculties, beginning with the Faculty of Arts, were established on its current main campus in Giza in October 1929. It is the second oldest institution of higher education in Egypt after Al Azhar University, notwithstanding the pre-existing higher professional schools that later became constituent colleges of the university. It was founded and funded as the Egyptian University by a commi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Averroes
Ibn Rushd ( ar, ; full name in ; 14 April 112611 December 1198), often Latinized as Averroes ( ), was an Andalusian polymath and jurist who wrote about many subjects, including philosophy, theology, medicine, astronomy, physics, psychology, mathematics, Islamic jurisprudence and law, and linguistics. The author of more than 100 books and treatises, his philosophical works include numerous commentaries on Aristotle, for which he was known in the Western world as ''The Commentator'' and ''Father of Rationalism''. Ibn Rushd also served as a chief judge and a court physician for the Almohad Caliphate. Averroes was a strong proponent of Aristotelianism; he attempted to restore what he considered the original teachings of Aristotle and opposed the Neoplatonist tendencies of earlier Muslim thinkers, such as Al-Farabi and Avicenna. He also defended the pursuit of philosophy against criticism by Ashari theologians such as Al-Ghazali. Averroes argued that philosophy was permissi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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