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Great Conjunction
A great conjunction is a conjunction of the planets Jupiter and Saturn, when the two planets appear closest together in the sky. Great conjunctions occur approximately every 20 years when Jupiter "overtakes" Saturn in its orbit. They are named "great" for being by far the rarest of the conjunctions between naked-eye planets (i.e. excluding Uranus and Neptune). The spacing between the planets varies from conjunction to conjunction with most events being 0.5 to 1.3 degrees (30 to 78 arcminutes, or 1 to 2.5 times the width of a full moon). Very close conjunctions happen much less frequently (though the maximum of 1.3° is still close by inner planet standards): separations of less than 10 arcminutes have only happened four times since 1200, most recently in 2020. In history Great conjunctions attracted considerable attention in the past as omens. During the late Middle Ages and Renaissance they were a topic broached by the pre-scientific and transitional astronomer-astrolog ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pierre D'Ailly
Pierre d'Ailly (; ; 13519 August 1420) was a French theologian, astrologer and cardinal of the Roman Catholic Church. Academic career D'Ailly was born in Compiègne in 1350 or 1351 of a prosperous bourgeois family. He studied in Paris at the Collège de Navarre, receiving the licentiate in arts in 1367 and the master’s a year later, and was active in university affairs by 1372. D'Ailly taught the Bible in 1375 and the ''Sentences'' of Peter Lombard in 1376–1377, and received the licentiate and doctorate in theology in 1381. He was affiliated with the university, serving as rector in 1384; among his pupils were Jean Gerson and Nicholas of Clémanges. The church's Great Schism, between two popes, arose in 1378. In the spring of 1379, d'Ailly, in anticipation even of the decision of the University of Paris, had carried to the pope of Avignon, Clement VII, the "role" of the French nation. Notwithstanding this prompt adhesion, he was firm in his desire to put an end to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orbital Period
The orbital period (also revolution period) is the amount of time a given astronomical object takes to complete one orbit around another object. In astronomy, it usually applies to planets or asteroids orbiting the Sun, moons orbiting planets, exoplanets orbiting other stars, or binary stars. It may also refer to the time it takes a satellite orbiting a planet or moon to complete one orbit. For celestial objects in general, the orbital period is determined by a 360° revolution of one body around its primary, ''e.g.'' Earth around the Sun. Periods in astronomy are expressed in units of time, usually hours, days, or years. Its reciprocal is the orbital frequency, a kind of revolution frequency, in units of hertz. Small body orbiting a central body According to Kepler's Third Law, the orbital period ''T'' of two point masses orbiting each other in a circular or elliptic orbit is: :T = 2\pi\sqrt where: * ''a'' is the orbit's semi-major axis * ''G'' is the gravitationa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Julian Year (astronomy)
In astronomy, a Julian year (symbol: a or aj) is a unit of measurement of time defined as exactly 365.25 days of SI seconds each.P. Kenneth Seidelmann, ed.''The explanatory supplement to the Astronomical Almanac'' (Mill Valley, Cal.: University Science Books, 1992), pp. 8, 696, 698–9, 704, 716, 730. Reprinted from the "IAU Style Manual" by G.A. Wilkinson, Comm. 5, in IAU Transactions XXB (1987).Harold Rabinowitz and Suzanne Vogel''The manual of scientific style''(Burlington, MA: Academic Press, 2009) 369. The length of the Julian year is the average length of the year in the Julian calendar that was used in Western societies until the adoption of the Gregorian Calendar, and from which the unit is named. Nevertheless, because astronomical Julian years are measuring duration rather than designating dates, this Julian year does not correspond to years in the Julian calendar or any other calendar. Nor does it correspond to the many other ways of defining a year. Usage The Ju ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radical Reformation
The Radical Reformation represented a response to perceived corruption both in the Catholic Church and in the expanding Magisterial Protestant movement led by Martin Luther and many others. Starting in Germany and Switzerland in the 16th century, the Radical Reformation gave birth to many radical Protestant groups throughout Europe. The term covers Radical Reformers like Thomas Müntzer and Andreas Karlstadt, the Zwickau prophets, and Anabaptist groups like the Hutterites and the Mennonites. In Germany, Switzerland and Austria, a majority sympathized with the Radical Reformation despite intense persecution. Although the surviving proportion of the European population that rebelled against Catholic, Lutheran and Reformed Churches was small, Radical Reformers wrote profusely, and the literature on the Radical Reformation is disproportionately large, partly as a result of the proliferation of the Radical Reformation teachings in the United States. History Some early forms ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zhou Dynasty
The Zhou dynasty ( ) was a royal dynasty of China that existed for 789 years from until 256 BC, the longest span of any dynasty in Chinese history. During the Western Zhou period (771 BC), the royal house, surnamed Ji, had military control over territories centered on the Wei River valley and North China Plain. Even as Zhou suzerainty became increasingly ceremonial over the following Eastern Zhou period (771–256 BC), the political system created by the Zhou royal house survived in some form for several additional centuries. A date of 1046 BC for the Zhou's establishment is supported by the Xia–Shang–Zhou Chronology Project and David Pankenier, but David Nivison and Edward L. Shaughnessy date the establishment to 1045 BC. The latter Eastern Zhou period is itself roughly subdivided into two parts. During the Spring and Autumn period (), power became increasingly decentralized as the authority of the royal house diminished. The Warring States ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shang Dynasty
The Shang dynasty (), also known as the Yin dynasty (), was a Chinese royal dynasty that ruled in the Yellow River valley during the second millennium BC, traditionally succeeding the Xia dynasty and followed by the Western Zhou dynasty. The classic account of the Shang comes from texts such as the '' Book of Documents'', '' Bamboo Annals'' and '' Shiji''. Modern scholarship dates the dynasty between the 16th and 11th centuries BC, with more agreement surrounding the end date than beginning date. The Shang dynasty is the earliest dynasty within traditional Chinese history that is firmly supported by archaeological evidence. The archaeological site of Yinxu, near modern-day Anyang, corresponds to the final Shang capital of Yin. Excavations at Yinxu have revealed eleven major royal tombs, the foundations of former palace buildings, and the remains of both animals and humans that were sacrificed in official state rituals. Tens of thousands of bronze, jade, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xia Dynasty
The Xia dynasty (; ) is the first dynasty in traditional Chinese historiography. According to tradition, it was established by the legendary figure Yu the Great, after Emperor Shun, Shun, the last of the Three Sovereigns and Five Emperors, Five Emperors, gave the throne to him. In traditional historiography, the Xia was succeeded by the Shang dynasty. There are no contemporaneous records of the Xia, and they are not mentioned in the oldest Chinese texts, the earliest oracle bone inscriptions dating from the Late Shang period (13th century BC). The earliest mentions occur in the oldest chapters of the ''Book of Documents'', which report speeches from the early Western Zhou period and are accepted by most scholars as dating from that time. The speeches justify the Zhou conquest of the Shang as the passing of the Mandate of Heaven and liken it to the succession of the Xia by the Shang. That political philosophy was promoted by the Confucian school in the Eastern Zhou period. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albumasar
Abu Ma‘shar al-Balkhi, Latinized as Albumasar (also ''Albusar'', ''Albuxar'', ''Albumazar''; full name ''Abū Maʿshar Jaʿfar ibn Muḥammad ibn ʿUmar al-Balkhī'' ; , AH 171–272), was an early Persian Muslim astrologer, thought to be the greatest astrologer of the Abbasid court in Baghdad. While he was not a major innovator, his practical manuals for training astrologers profoundly influenced Muslim intellectual history and, through translations, that of western Europe and Byzantium. Life Abū Maʿshar was a native of Balkh, a town in the Balkh province of Afghanistan, approximately 74 kilometres (46 mi) to the south of the Amu Darya, one of the main bases of support of the Abbasid revolt in the early 8th century. Its population, as was generally the case in the frontier areas of the Arab conquest of Persia, remained culturally dedicated to its Sassanian and Hellenistic heritage. He probably came to Baghdad in the early years of the caliphate of al-Maʾmūn (r. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shakespeare
William Shakespeare ( 23 April 1564 – 23 April 1616) was an English playwright, poet and actor. He is widely regarded as the greatest writer in the English language and the world's pre-eminent dramatist. He is often called England's national poet and the " Bard of Avon" or simply "the Bard". His extant works, including collaborations, consist of some 39 plays, 154 sonnets, three long narrative poems and a few other verses, some of uncertain authorship. His plays have been translated into every major living language and are performed more often than those of any other playwright. Shakespeare remains arguably the most influential writer in the English language, and his works continue to be studied and reinterpreted. Shakespeare was born and raised in Stratford-upon-Avon, Warwickshire. At the age of 18, he married Anne Hathaway, with whom he had three children: Susanna, and twins Hamnet and Judith. Sometime between 1585 and 1592 he began a successful career in Lon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
