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Sacrobosco
Johannes de Sacrobosco, also written Ioannes de Sacro Bosco, later called John of Holywood or John of Holybush ( 1195 – 1256), was a scholar, monk, and astronomer who taught at the University of Paris. He wrote a short introduction to the Hindu-Arabic numeral system. Judging from the number of manuscript copies that survive today, for the next 400 years it became the most widely read book on that subject. He also wrote a short textbook which was widely read and influential in Europe during the later medieval centuries as an introduction to astronomy. In his longest book, on the computation of the date of Easter, Sacrobosco correctly described the defects of the then-used Julian calendar, and recommended a solution similar to the modern Gregorian calendar three centuries before its implementation. Very little is known about the education and biography of Sacrobosco. For one thing, his year of death has been guessed at 1236, 1244, and 1256, each of which is plausible and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sacrobosco Sphaera1
Johannes de Sacrobosco, also written Ioannes de Sacro Bosco, later called John of Holywood or John of Holybush ( 1195 – 1256), was a scholar, monk, and astronomer who taught at the University of Paris. He wrote a short introduction to the Hindu-Arabic numeral system. Judging from the number of manuscript copies that survive today, for the next 400 years it became the most widely read book on that subject. He also wrote a short textbook which was widely read and influential in Europe during the later medieval centuries as an introduction to astronomy. In his longest book, on the computation of the date of Easter, Sacrobosco correctly described the defects of the then-used Julian calendar, and recommended a solution similar to the modern Gregorian calendar three centuries before its implementation. Very little is known about the education and biography of Sacrobosco. For one thing, his year of death has been guessed at 1236, 1244, and 1256, each of which is plausibl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Of Holywood (Johannes De Sacrobosco)
Johannes de Sacrobosco, also written Ioannes de Sacro Bosco, later called John of Holywood or John of Holybush ( 1195 – 1256), was a scholar, monk, and astronomer who taught at the University of Paris. He wrote a short introduction to the Hindu-Arabic numeral system. Judging from the number of manuscript copies that survive today, for the next 400 years it became the most widely read book on that subject. He also wrote a short textbook which was widely read and influential in Europe during the later medieval centuries as an introduction to astronomy. In his longest book, on the computation of the date of Easter, Sacrobosco correctly described the defects of the then-used Julian calendar, and recommended a solution similar to the modern Gregorian calendar three centuries before its implementation. Very little is known about the education and biography of Sacrobosco. For one thing, his year of death has been guessed at 1236, 1244, and 1256, each of which is plausible and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
De Sphaera Mundi
''De sphaera mundi'' (Latin title meaning ''On the Sphere of the World'', sometimes rendered ''The Sphere of the Cosmos''; the Latin title is also given as ''Tractatus de sphaera'', ''Textus de sphaera'', or simply ''De sphaera'') is a medieval introduction to the basic elements of astronomy written by Johannes de Sacrobosco (John of Holywood) c. 1230. Based heavily on Ptolemy's ''Almagest'', and drawing additional ideas from Islamic astronomy, it was one of the most influential works of pre- Copernican astronomy in Europe. Reception Sacrobosco's ''De sphaera mundi'' was the most successful of several competing thirteenth-century textbooks on this topic. It was used in universities for hundreds of years and the manuscript copied many times before the invention of the printing press; hundreds of manuscript copies have survived. The first printed edition appeared in 1472 in Ferrara, and at least 84 editions were printed in the next two hundred years. The work was frequently supplem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Julian Calendar
The Julian calendar, proposed by Roman consul Julius Caesar in 46 BC, was a reform of the Roman calendar. It took effect on , by edict. It was designed with the aid of Greek mathematicians and astronomers such as Sosigenes of Alexandria. The calendar became the predominant calendar in the Roman Empire and subsequently most of the Western world for more than 1,600 years until 1582, when Pope Gregory XIII promulgated a minor modification to reduce the average length of the year from 365.25 days to 365.2425 days and thus corrected the Julian calendar's drift against the solar year. Worldwide adoption of this revised calendar, which became known as the Gregorian calendar, took place over the subsequent centuries, first in Catholic countries and subsequently in Protestant countries of the Western Christian world. The Julian calendar is still used in parts of the Eastern Orthodox Church and in parts of Oriental Orthodoxy as well as by the Berbers. The Julian calenda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geocentric Model
In astronomy, the geocentric model (also known as geocentrism, often exemplified specifically by the Ptolemaic system) is a superseded description of the Universe with Earth at the center. Under most geocentric models, the Sun, Moon, stars, and planets all orbit Earth. The geocentric model was the predominant description of the cosmos in many European ancient civilizations, such as those of Aristotle in Classical Greece and Ptolemy in Roman Egypt. Two observations supported the idea that Earth was the center of the Universe: * First, from anywhere on Earth, the Sun appears to revolve around Earth once per day. While the Moon and the planets have their own motions, they also appear to revolve around Earth about once per day. The stars appeared to be fixed on a celestial sphere rotating once each day about an axis through the geographic poles of Earth. * Second, Earth seems to be unmoving from the perspective of an earthbound observer; it feels solid, stable, and stationary ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gregorian Calendar
The Gregorian calendar is the calendar used in most parts of the world. It was introduced in October 1582 by Pope Gregory XIII as a modification of, and replacement for, the Julian calendar. The principal change was to space leap years differently so as to make the average calendar year 365.2425 days long, more closely approximating the 365.2422-day 'tropical' or 'solar' year that is determined by the Earth's revolution around the Sun. The rule for leap years is: There were two reasons to establish the Gregorian calendar. First, the Julian calendar assumed incorrectly that the average solar year is exactly 365.25 days long, an overestimate of a little under one day per century, and thus has a leap year every four years without exception. The Gregorian reform shortened the average (calendar) year by 0.0075 days to stop the drift of the calendar with respect to the equinoxes.See Wikisource English translation of the (Latin) 1582 papal bull '' Inter gravissimas''. Secon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robertus Anglicus
Robertus Anglicus or Robert the Englishman was an English astronomer of the thirteenth century. He taught at the University of Montpellier, and possibly also at Paris. He is known as the author of a 1271 commentary on the ''De Sphera Mundi'' of Johannes de Sacrobosco. It includes a significant reference to the state of the art in the technology of clockwork Clockwork refers to the inner workings of either mechanical devices called clocks and watches (where it is also called the movement) or other mechanisms that work similarly, using a series of gears driven by a spring or weight. A clockwork mech .... He is also the author of the paper "Astrolabii Canones", which provided important principles for measurement on spheres. References * N ...
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Holywood Abbey
Dercongal Abbey (or Holywood Abbey) was a Premonstratensian monastic community located in Dumfriesshire, Scotland. History The date of its foundation is not known, but it was certainly in existence as a Premonstratensian monastic community by 1225. The founder was presumably Alan, Lord of Galloway. Dercongal seems to come from ''Doire Congaill'', Congall's oak-copse, Congall (Welsh, ''Cinvall'') being a saint venerated by the natives of the area. For this reason the abbot of Dercongal also became known as the abbot "de Sacro Nemore" (="of the Holy Wood"), becoming "Holywood" in English. Saint Vimin (died 579) is said to have founded Holywood Abbey. Little of its history is known and few of the abbots of Dercongal names have survived, although a good deal of archaeological remains are extant. The abbey became secularized in the 16th century and in the beginning of the 17th century was turned into a secular lordship. The ruins of the abbey were demolished in the last quarter of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Universe
The universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy. The Big Bang theory is the prevailing cosmological description of the development of the universe. According to this theory, space and time emerged together ago, and the universe has been expanding ever since the Big Bang. While the spatial size of the entire universe is unknown, it is possible to measure the size of the observable universe, which is approximately 93 billion light-years in diameter at the present day. Some of the earliest cosmological models of the universe were developed by ancient Greek and Indian philosophers and were geocentric, placing Earth at the center. Over the centuries, more precise astronomical observations led Nicolaus Copernicus to develop the heliocentric model with the Sun at the center of the Solar System. In developing the law of universal gravitation, Isaac Newton built upon Copernicus' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holywood, County Down
Holywood ( ) ( Irish: ''Ard Mhic Nasca'', meaning 'Height of the Son of Nasca'. Latin: ''Sanctus Boscus'', meaning 'Holy Wood') is a town in the metropolitan area of Belfast in County Down, Northern Ireland. It is a civil parish and townland of 755 acres lying on the shore of Belfast Lough, between Belfast and Bangor. Holywood Exchange and Belfast City Airport are nearby. The town hosts an annual jazz and blues festival. Toponymy The English name ''Holywood'' comes . This was the name the Normans gave to the woodland surrounding the monastery of St Laiseran, son of Nasca. The monastery was founded by Laiseran before 640 and was on the site of the present Holywood Priory. The earliest Anglicised form appears as ''Haliwode'' in a 14th-century document. The Irish name for Holywood is ''Ard Mhic Nasca'' meaning "high ground of Mac Nasca". History In the early 19th century, Holywood, like many other coastal villages throughout Ireland, became popular as a resort for sea-bathin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miloš Tichý
Miloš Tichý (born 1966 in Počátky) is a Czech astronomer. He is a prolific discoverer of asteroids. He also discovered the periodic comet 196P/Tichý. He works together with his ex-wife at Kleť Observatory Kleť Observatory ( cz, Hvězdárna Kleť; obs. code: 046) is an astronomical observatory in the Czech Republic. It is situated in South Bohemia, south of the summit of Mount Kleť, near the town of České Budějovice. Constructed in 1957, t .... Asteroid 3337 Miloš is named after him. Discoveries List of discovered comets List of discovered minor planets See also * References External links Homepage {{DEFAULTSORT:Tichy, Milos 1966 births Living people People from Počátky 20th-century astronomers Czech astronomers Discoverers of asteroids Discoverers of comets * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jana Tichá
Jana Tichá (born 1965 in České Budějovice) is a Czech astronomer and discoverer of minor planets. She studied at the University of Economics in Prague and graduated in 1987. In 1992 she was selected for the position of a director of the Kleť Observatory. She specializes in discoveries of asteroids and comets especially near-Earth objects (NEOs). The Minor Planet Center credits her with the discovery of 104 numbered minor planets during 1995–2003. She is the chair of the IAU Committee on Small Body Nomenclature (CSBN), which is responsible for approving names of asteroids. She works together with her husband Miloš Tichý Miloš Tichý (born 1966 in Počátky) is a Czech astronomer. He is a prolific discoverer of asteroids. He also discovered the periodic comet 196P/Tichý. He works together with his ex-wife at Kleť Observatory Kleť Observatory ( cz, Hvěz ... at Kleť. In her country she is also well known for her popularization activities. She is major cont ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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