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Calendrical Calculation
A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics. Some examples of calendrical calculations: * Converting a Julian or Gregorian calendar date to its Julian day number and vice versa . * The number of days between two dates, which is simply the difference in their Julian day numbers. * The dates of moveable holidays, like Christian Easter (the calculation is known as Computus) followed up by Ascension Thursday and Pentecost or Advent Sundays, or the Jewish Passover, for a given year. * Converting a date between different calendars. For instance, dates in the Gregorian calendar can be converted to dates in the Islamic calendar with the Kuwaiti algorithm. * Calculating the day of the week. Calendrical calculation is one of the five major Savant syndrome characteristics. Examples Numerical methods were described in the ''Journal of the Department of Mathematics,'' Open University, Milto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calculation
A calculation is a deliberate mathematical process that transforms a plurality of inputs into a singular or plurality of outputs, known also as a result or results. The term is used in a variety of senses, from the very definite arithmetical calculation of using an algorithm, to the vague heuristics of calculating a strategy in a competition, or calculating the chance of a successful relationship between two people. For example, multiplying 7 by 6 is a simple algorithmic calculation. Extracting the square root or the cube root of a number using mathematical models is a more complex algorithmic calculation. Statistical estimations of the likely election results from opinion polls also involve algorithmic calculations, but produces ranges of possibilities rather than exact answers. To ''calculate'' means to determine mathematically in the case of a number or amount, or in the case of an a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Islamic Calendar
The Hijri calendar (), also known in English as the Islamic calendar, is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days. It is used to determine the proper days of Islamic holidays and rituals, such as the Ramadan, annual fasting and the annual season for the Hajj, great pilgrimage. In almost all countries where the predominant religion is Islam, the civil calendar is the Gregorian calendar, with Assyrian calendar, Syriac month-names used in the Arabic names of calendar months#Levant and Mesopotamia, Levant and Mesopotamia (Iraq, Syria, Jordan, Lebanon and Palestine), but the religious calendar is the Hijri one. This calendar enumerates the Hijri era, whose Epoch (reference date), epoch was established as the Islamic New Year in 622 Common Era, CE. During that year, Muhammad and his followers migrated from Mecca to Medina and established the first Muslim community (''ummah''), an event commemorated as the Hijrah. In the West, dates in this era ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Ultimate Edition
''The Ultimate Edition'' is a limited edition 50-disc CD box set released by Klaus Schulze in 2000 collecting his previous limited edition multi-disc box sets '' Silver Edition'' (1993, 10 discs), '' Historic Edition'' (1995, 10 discs), and '' Jubilee Edition'' (1997, 25 discs), which contain unreleased archival recordings in addition to new studio material. A further five discs were added for this release. Several discs were altered and restructured from their original versions: discs 7 and 8 were extended by five minutes; discs 11, 13, 14, and 22 were slightly remastered; and discs 41 and 42 were restructured. Two tracks from ''Jubilee Edition'' were omitted ("The Unspoken Thing" from Disc 19 and "Ludwigs Traum" from Disc 21). The discs are divided into five boxes of ten discs, housed in individual cardboard sleeves. Between 2009 and 2015, tracks from this set were reissued as '' La Vie Electronique'', a series of multi-disc CD sets releasing all the material of ''The Ultimate Edi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nachum Dershowitz
Nachum Dershowitz () is an Israeli computer scientist, known e.g. for the Dershowitz–Manna ordering and the Path_ordering_(term_rewriting), multiset path ordering used to prove Rewriting#Termination, termination of term rewrite systems. Education and career He obtained his B.Sc., ''summa cum laude'', in 1974 in computer science and applied mathematics from Bar-Ilan University, and his Ph.D. in 1979 in Applied Mathematics from the Weizmann Institute of Science. From 1978, he worked at the Department of Computer Science of the University of Illinois at Urbana-Champaign, and was hired as a full professor of the Tel Aviv University (School of Computer Science) in 1998. He was a guest researcher at Weizmann Institute, INRIA, ENS Cachan, Microsoft Research, and the universities of Stanford University, Stanford, Université de Paris Orsay, Paris, Hebrew University, Jerusalem, University of Chicago, Chicago, and Tsinghua University, Beijing. He received the Herbrand Award for Distingu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edward M
Edward is an English male name. It is derived from the Anglo-Saxon name ''Ēadweard'', composed of the elements '' ēad'' "wealth, fortunate; prosperous" and '' weard'' "guardian, protector”. History The name Edward was very popular in Anglo-Saxon England, but the rule of the Norman and Plantagenet dynasties had effectively ended its use amongst the upper classes. The popularity of the name was revived when Henry III named his firstborn son, the future Edward I, as part of his efforts to promote a cult around Edward the Confessor, for whom Henry had a deep admiration. Variant forms The name has been adopted in the Iberian peninsula since the 15th century, due to Edward, King of Portugal, whose mother was English. The Spanish/Portuguese forms of the name are Eduardo and Duarte. Other variant forms include French Édouard, Italian Edoardo and Odoardo, German, Dutch, Czech and Romanian Eduard and Scandinavian Edvard. Short forms include Ed, Eddy, Eddie, Ted, Teddy an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calendrical Calculations
''Calendrical Calculations'' is a book on calendar systems and algorithms for computers to convert between them. It was written by computer scientists Nachum Dershowitz and Edward Reingold and published in 1997 by the Cambridge University Press. A second "millennium" edition with a CD-ROM of software was published in 2001, a third edition in 2008, and a fourth "ultimate" edition in 2018. Topics There have been many different calendars in different societies, and there is much difficulty in converting between them, largely because of the impossibility of reconciling the irrational ratios of the daily, monthly, and yearly astronomical cycle lengths using integers. The 14 calendars discussed in the first edition of the book included the Gregorian calendar, ISO week date, Julian calendar, Coptic calendar, Ethiopian calendar, Islamic calendar, modern Iranian calendar, Baháʼí calendar, French Republican calendar, old and modern Hindu calendars, Maya calendar, and modern Chinese cal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Date Of Easter
As a moveable feast, the date of Easter is determined in each year through a calculation known as – often simply ''Computus'' – or as paschalion particularly in the Eastern Orthodox Church. Easter is celebrated on the first Sunday after the Paschal full moon (a mathematical approximation of the first astronomical full moon, on or after 21 March itself a fixed approximation of the March equinox). Determining this date in advance requires a correlation between the lunar months and the tropical year, solar year, while also accounting for the month, date, and weekday of the Julian calendar, Julian or Gregorian calendar. The complexity of the algorithm arises because of the desire to associate the date of Easter with the date of the Jewish feast of Passover which, Christians believe, is when Jesus was crucified. It was originally feasible for the entire Christian Church to receive the date of Easter each year through an annual announcement by the pope. By the early third ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Savant Syndrome
Savant syndrome ( , ) is a phenomenon where someone demonstrates exceptional aptitude in one domain, such as art or mathematics, despite significant social or intellectual impairment. Those with the condition generally have a neurodevelopmental condition, such as autism, or have experienced a brain injury. About half of cases are associated with autism, and these individuals may be known as autistic savants. The other half often have some form of central nervous system injury or disease. While the condition usually becomes apparent in childhood, some cases develop later in life. It is not recognized as a mental disorder within the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), as it relates to parts of the brain healing or restructuring. Savant syndrome is estimated to affect around one in a million people. The condition affects more males than females, at a ratio of 6:1. The first medical account of the condition was in 1783. It is estima ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calculating The Day Of The Week
The determination of the day of the week for any date may be performed with a variety of algorithms. In addition, perpetual calendars require no calculation by the user, and are essentially lookup tables. A typical application is to calculate the day of the week on which someone was born or a specific event occurred. Concepts In numerical calculation, the days of the week are represented as weekday numbers. If Monday is the first day of the week, the days may be coded 1 to 7, for Monday through Sunday, as is practiced in ISO 8601. The day designated with 7 may also be counted as ''0'', by applying the arithmetic modulo 7, which calculates the remainder of a number after division by 7. Thus, the number 7 is treated as 0, the number 8 as 1, the number 9 as 2, the number 18 as 4, and so on. If Sunday is counted as day 1, then 7 days later (''i.e.''day 8) is also a Sunday, and day 18 is the same as day 4, which is a Wednesday since this falls three days after Sunday (''i.e.''). Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kuwaiti Algorithm
The Tabular Islamic calendar () is a rule-based variation of the Islamic calendar. It has the same numbering of years and months, but the months are determined by arithmetical rules rather than by observation or astronomical calculations. It was developed by early Muslim astronomers of the second hijra century (the 8th century of the Common Era) to provide a predictable time base for calculating the positions of the moon, sun, and planets. It is now used by historians to convert an Islamic date into a Western calendar when no other information (like the day of the week) is available. Its calendar era is the Hijri year. An example is the Fatimid or Misri calendar. It is used by some Muslims in everyday life, particularly in Ismaili and Shi'a communities, believing that this calendar was developed by Ali. It is believed that when Ali drew up this calendar, the previous events of the earlier prophets also fell into line with this calendar. It is their belief that all Fatimid Imams ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Passover
Passover, also called Pesach (; ), is a major Jewish holidays, Jewish holiday and one of the Three Pilgrimage Festivals. It celebrates the Exodus of the Israelites from slavery in Biblical Egypt, Egypt. According to the Book of Exodus, God in Judaism, God commanded Moses to tell the Israelites to slaughter a lamb and mark their doorframes with its blood, in addition to instructions for consuming the lamb that night. For that night, God would send the Destroying angel (Bible), Angel of Death to bring about the Plagues of Egypt, tenth plague, in which he would Plagues of Egypt#plague10, smite all the firstborn in Egypt. But when the angel saw the blood on the Israelites' doorframes, he would ''pass over'' their homes so that the plague should not enter (hence the name). The story is part of the broader Exodus narrative, in which the Israelites, while living in Egypt, are enslaved en masse by the Pharaoh to suppress them; when Pharaoh refuses God's demand to let them go, God sends ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calendar Date
A calendar date is a reference to a particular day, represented within a calendar system, enabling a specific day to be unambiguously identified. Simple math can be performed between dates; commonly, the number of days between two dates may be calculated, e.g., "25 " is ten days after "15 ". The date of a particular event depends on the time zone used to record it. For example, the air attack on Pearl Harbor that began at 7:48 a.m. local Hawaiian time (HST) on 7 December 1941 is recorded equally as having happened on 8 December at 3:18 a.m. Japan Standard Time (JST). A particular day may be assigned a different nominal date according to the calendar used. The de facto standard for recording dates worldwide is the Gregorian calendar, the world's most widely used civil calendar. Many cultures use religious calendars such as the Gregorian ( Western Christendom, AD), the Julian calendar ( Eastern Christendom, AD), Hebrew calendar (Judaism, AM), the Hijri calendars (Is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
