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Pedro Chacón
Pedro Chacón (1526 in Toledo – 1581 in Rome) was a Spanish mathematician and theologian. Life He worked as professor of Greek at the University of Salamanca, whose history, consulting ancient documents in the library, he published in 1569. In Salamanca he was part of the School of Salamanca, a notable group of professors which also included Francisco de Salinas and Fray Luis de León. By 1572 he had moved to Rome, where he been summoned by Pope Gregory XIII to do mathematical work towards reform of the Julian Calendar. As part of this work, in 1577 he wrote the ''Compendium Novae Rationis Restituendi Kalendarium'', a description of the calendar reform proposal of Aloysius Lilius, upon which the 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 dif ... would b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pedro Chacón
Pedro Chacón (1526 in Toledo – 1581 in Rome) was a Spanish mathematician and theologian. Life He worked as professor of Greek at the University of Salamanca, whose history, consulting ancient documents in the library, he published in 1569. In Salamanca he was part of the School of Salamanca, a notable group of professors which also included Francisco de Salinas and Fray Luis de León. By 1572 he had moved to Rome, where he been summoned by Pope Gregory XIII to do mathematical work towards reform of the Julian Calendar. As part of this work, in 1577 he wrote the ''Compendium Novae Rationis Restituendi Kalendarium'', a description of the calendar reform proposal of Aloysius Lilius, upon which the 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 dif ... would b ... [...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''. Second, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1581 Deaths
1581 ( MDLXXXI) was a common year starting on Sunday (link will display the full calendar) in the 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 Alexandr ..., and a common year starting on Thursday (link will display full calendar) of the Proleptic Gregorian calendar. Events January–June * March 18 – The Parliament of England's ''Act against Reconciliation to Rome'' imposes heavy fines, for practising Roman Catholicism. * March 25 – Iberian Union: Philip II of Spain is crowned Philip I of Portugal. * April 4 – Following his circumnavigation of the world, Francis Drake is knighted by Elizabeth I of England. July–December * July 14 – English Jesuit Edmund Campion is arrested. * July 26 **The Northern Netherlands (Union of Utr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1526 Births
Fifteen or 15 may refer to: *15 (number), the natural number following 14 and preceding 16 *one of the years 15 BC, AD 15, 1915, 2015 Music *Fifteen (band), a punk rock band Albums * ''15'' (Buckcherry album), 2005 * ''15'' (Ani Lorak album), 2007 * ''15'' (Phatfish album), 2008 * ''15'' (mixtape), a 2018 mixtape by Bhad Bhabie * ''Fifteen'' (Green River Ordinance album), 2016 * ''Fifteen'' (The Wailin' Jennys album), 2017 * ''Fifteen'', a 2012 album by Colin James Songs * "Fifteen" (song), a 2008 song by Taylor Swift *"Fifteen", a song by Harry Belafonte from the album '' Love Is a Gentle Thing'' *"15", a song by Rilo Kiley from the album ''Under the Blacklight'' *"15", a song by Marilyn Manson from the album ''The High End of Low'' *"The 15th", a 1979 song by Wire Other uses *Fifteen, Ohio, a community in the United States * ''15'' (film), a 2003 Singaporean film * ''Fifteen'' (TV series), international release name of ''Hillside'', a Canadian-American teen drama *Fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hellenists
In Classical antiquity, the Hellenistic period covers the time in Mediterranean history after Classical Greece, between the death of Alexander the Great in 323 BC and the emergence of the Roman Empire, as signified by the Battle of Actium in 31 BC and the conquest of Ptolemaic Egypt the following year. The Ancient Greek word ''Hellas'' (, ''Hellás'') was gradually recognized as the name for Greece, from which the word ''Hellenistic'' was derived. "Hellenistic" is distinguished from "Hellenic" in that the latter refers to Greece itself, while the former encompasses all ancient territories under Greek influence, in particular the East after the conquests of Alexander the Great. After the Macedonian invasion of the Achaemenid Empire in 330 BC and its disintegration shortly after, the Hellenistic kingdoms were established throughout south-west Asia (Seleucid Empire, Kingdom of Pergamon), north-east Africa ( Ptolemaic Kingdom) and South Asia (Greco-Bactrian Kingdom, Indo-Greek Kin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spanish Classical Scholars
Spanish might refer to: * Items from or related to Spain: **Spaniards are a nation and ethnic group indigenous to Spain **Spanish language, spoken in Spain and many Latin American countries **Spanish cuisine Other places * Spanish, Ontario, Canada * Spanish River (other), the name of several rivers * Spanish Town, Jamaica Other uses * John J. Spanish (1922–2019), American politician * "Spanish" (song), a single by Craig David, 2003 See also * * * Español (other) * Spain (other) * España (other) * Espanola (other) * Hispania, the Roman and Greek name for the Iberian Peninsula * Hispanic, the people, nations, and cultures that have a historical link to Spain * Hispanic (other) * Hispanism * Spain (other) * National and regional identity in Spain * Culture of Spain * Spanish Fort (other) Spanish Fort or Old Spanish Fort may refer to: United States * Spanish Fort, Alabama, a city * Spanish Fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
16th-century Spanish Historians
The 16th century begins with the Julian year 1501 ( MDI) and ends with either the Julian or the Gregorian year 1600 ( MDC) (depending on the reckoning used; the Gregorian calendar introduced a lapse of 10 days in October 1582). The 16th century is regarded by historians as the century which saw the rise of Western civilization and the Islamic gunpowder empires. The Renaissance in Italy and Europe saw the emergence of important artists, authors and scientists, and led to the foundation of important subjects which include accounting and political science. Copernicus proposed the heliocentric universe, which was met with strong resistance, and Tycho Brahe refuted the theory of celestial spheres through observational measurement of the 1572 appearance of a Milky Way supernova. These events directly challenged the long-held notion of an immutable universe supported by Ptolemy and Aristotle, and led to major revolutions in astronomy and science. Galileo Galilei became a champion of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
16th-century Spanish Mathematicians
The 16th century begins with the Julian year 1501 ( MDI) and ends with either the Julian or the Gregorian year 1600 ( MDC) (depending on the reckoning used; the Gregorian calendar introduced a lapse of 10 days in October 1582). The 16th century is regarded by historians as the century which saw the rise of Western civilization and the Islamic gunpowder empires. The Renaissance in Italy and Europe saw the emergence of important artists, authors and scientists, and led to the foundation of important subjects which include accounting and political science. Copernicus proposed the heliocentric universe, which was met with strong resistance, and Tycho Brahe refuted the theory of celestial spheres through observational measurement of the 1572 appearance of a Milky Way supernova. These events directly challenged the long-held notion of an immutable universe supported by Ptolemy and Aristotle, and led to major revolutions in astronomy and science. Galileo Galilei became a champion o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
16th-century Spanish Roman Catholic Theologians
The 16th century begins with the Julian year 1501 ( MDI) and ends with either the Julian or the Gregorian year 1600 ( MDC) (depending on the reckoning used; the Gregorian calendar introduced a lapse of 10 days in October 1582). The 16th century is regarded by historians as the century which saw the rise of Western civilization and the Islamic gunpowder empires. The Renaissance in Italy and Europe saw the emergence of important artists, authors and scientists, and led to the foundation of important subjects which include accounting and political science. Copernicus proposed the heliocentric universe, which was met with strong resistance, and Tycho Brahe refuted the theory of celestial spheres through observational measurement of the 1572 appearance of a Milky Way supernova. These events directly challenged the long-held notion of an immutable universe supported by Ptolemy and Aristotle, and led to major revolutions in astronomy and science. Galileo Galilei became a champion ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aloysius Lilius
Aloysius Lilius (c. 1510 – 1576), also variously referred to as Luigi Lilio or Luigi Giglio, was an Italian doctor, astronomer, philosopher and chronologist, and also the "primary author" who provided the proposal that (after modifications) became the basis of the Gregorian Calendar reform of 1582.For name-variants and a few biographical details (including citation to a biography published in 1963) see page 206 in: A Ziggelaar (1983)"The papal bull of 1582 promulgating a reform of the calendar" pages 201–239 in G. V. Coyne (ed.), ''The Gregorian Reform of the Calendar: Proceedings of the Vatican conference to commemorate its 400th anniversary'' (Vatican City: Specola Vaticana), 1983. The crater Lilius on the Moon is named after him, as is the asteroid 2346 Lilio. In computer science, the Lilian date is the number of days since the adoption of the Gregorian calendar on 15 October 1582. Life and work Not much is known about the early life of Lilius/Lilio/Giglio. It is know ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Toledo, Spain
Toledo ( , ) is a city and municipality of Spain, capital of the province of Toledo and the ''de jure'' seat of the government and parliament of the autonomous communities of Spain, autonomous community of Castilla–La Mancha. Toledo was declared a World Heritage Site by UNESCO in 1986 for its extensive monumental and cultural heritage. Located on the banks of the Tagus in central Iberian Peninsula, Iberia, Toledo is known as the "City of the Three Cultures" for the cultural influences of Christians, Muslims, and Jews throughout its history. It was the capital, from 542 to 725 CE, of the Visigothic kingdom, which followed the fall of the Roman Empire. Toledo was also the location of historic events such as the Councils of Toledo and was labelled the "Imperial City" due to the fact that it was the main venue of the court of Charles V, Holy Roman Emperor in Spain. The city, seat of a powerful archdiocese for much of its history, has a Gothic Cathedral, the ''Cathedral of Toledo, Ca ... [...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] |
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