The 21st century is the current century of the Anno Domini era or Common Era, in accordance with the Gregorian calendar. It began on January 1, 2001, will end on December 31, 2100, it is the first century of the 3rd millennium. It is distinct from the century known as the 2000s which began on January 1, 2000 and will end on December 31, 2099; the first years of the 21st century have thus far been marked by the rise of a global economy and Third World consumerism, mistrust in government, deepening global concern over terrorism and an increase in the power of private enterprise. The Arab Spring of the early 2010s led to mixed outcomes in the Arab world; the Third Industrial Revolution which began around the 1980s continues into the present, is expected to transition into Industry 4.0 and the Fourth Industrial Revolution by as early as 2030. Millennials and Generation Z come of rise to prominence in this century. In 2016, the United Kingdom decided causing Brexit. Advances in technology such as ultrasound, prenatal genetic testing and genetic engineering is changing the demographics and has the potential to change the genetic makeup of the human population.
Because of sex selective abortion, fewer girls have been born in the 21st century compared to in past centuries because of son preference in East and South Asia. In 2014 only 47 percent of Indian births were of girls; this has led to an increase in bachelors in countries such as India. The first genetically modified children were born in November 2018 in China, beginning a new biological era for the human species and raising great controversy. Anxiety and depression rates are rising in many other parts of the world. However, suicide rates have fallen in Europe and most of the rest of the world so far this century, declining 29% globally between 2000 and 2018, despite rising 18% in the United States in the same period; the decline in suicide has been most notable among Chinese and Indian women, the elderly and middle-aged Russian men. The entire written works of mankind, from the beginning of recorded history to 2003, in all known languages, is estimated to be at five exabytes of data. Since 2003, with the birth of social media and "user-generated content", the same amount of data is created every two days.
The advancement of the sum total of human knowledge and information continues to grow at an exponential rate. Telecommunications in the early 21st century are much more advanced and universal than they were in the late 20th century. Only a few percent of the world's population were Internet users and cellular phone owners in the late 1990s. In the 2010s, artificial intelligence in the form of deep learning and machine learning became more prevalent, is prominently used in Gmail and Google's search engine, as well as in banking, the military and other niches. In 2017, 14% of the world's population still lacked access to electricity. In 2001, Dennis Tito became the first space tourist. Entrepreneurs such as Elon Musk and Richard Branson are working towards commercial space exploration and tourism, China and India have made substantial strides in their space program. On January 3, 2019, China landed a robotic spacecraft on the far side of the Moon, being the first to do so. War and most kinds of crime and violence have declined compared to the 20th century.
Malnourishment and poverty are still widespread globally, but fewer people live in the most extreme forms of poverty, relative to recorded history. In 1990 one-in-four people were malnourished, nearly 36% of the world's population lived in extreme poverty. If current trends hold, the United Nations projects the eradication of famine and extreme poverty by the end of this century; the Facebook–Cambridge Analytica data scandal draws international attention to the possible negative effects of social media on influencing citizen's views in regards to the 2016 United States presidential election. The world population was about 6.1 billion at the start of the 21st century and reached 7.7 billion by January 2019. It is estimated to reach about 8.6 billion by the year 2030, 9.8 billion by the year 2050. According to the United Nations World Urbanization prospects, 60% of the world's human population are projected to live in megacities and megalopolises by 2030, 70% by 2050, 90% by 2080. By 2040, more than 5 times the current global gross domestic product are expected to be invested in urban infrastructure and its use.
Life expectancy is increasing. A baby born in 2016 can on average expect to live 72 years. Ten million Britons are expected to live to 100 or older; however climate change remains an serious concern. Economically and politically the United States and Western Europe were dominant at the beginning of the century. In terms of purchasing power parity India's economy became larger than that of Japan around the year 2011; the ongoing impact of technological unemployment due to automation and computerization on job employment is massive: the rat
The numeric system represented by Roman numerals originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages. Numbers in this system are represented by combinations of letters from the Latin alphabet. Roman numerals, as used today, employ seven symbols, each with a fixed integer value, as follows: The use of Roman numerals continued long after the decline of the Roman Empire. From the 14th century on, Roman numerals began to be replaced in most contexts by the more convenient Arabic numerals; the original pattern for Roman numerals used the symbols I, V, X as simple tally marks. Each marker for 1 added a unit value up to 5, was added to to make the numbers from 6 to 9: I, II, III, IIII, V, VI, VII, VIII, VIIII, X; the numerals for 4 and 9 proved problematic, are replaced with IV and IX. This feature of Roman numerals is called subtractive notation; the numbers from 1 to 10 are expressed in Roman numerals as follows: I, II, III, IV, V, VI, VII, VIII, IX, X.
The system being decimal and hundreds follow the same underlying pattern. This is the key to understanding Roman numerals: Thus 10 to 100: X, XX, XXX, XL, L, LX, LXX, LXXX, XC, C. Note that 40 and 90 follow the same subtractive pattern as 4 and 9, avoiding the confusing XXXX. 100 to 1000: C, CC, CCC, CD, D, DC, DCC, DCCC, CM, M. Again - 400 and 900 follow the standard subtractive pattern, avoiding CCCC. In the absence of standard symbols for 5,000 and 10,000 the pattern breaks down at this point - in modern usage M is repeated up to three times; the Romans had several ways to indicate larger numbers, but for practical purposes Roman Numerals for numbers larger than 3,999 are if used nowadays, this suffices. M, MM, MMM. Many numbers include hundreds and tens; the Roman numeral system being decimal, each power of ten is added in descending sequence from left to right, as with Arabic numerals. For example: 39 = "Thirty nine" = XXXIX. 246 = "Two hundred and forty six" = CCXLVI. 421 = "Four hundred and twenty one" = CDXXI.
As each power of ten has its own notation there is no need for place keeping zeros, so "missing places" are ignored, as in Latin speech, thus: 160 = "One hundred and sixty" = CLX 207 = "Two hundred and seven" = CCVII 1066 = "A thousand and sixty six" = MLXVI. Roman numerals for large numbers are nowadays seen in the form of year numbers, as in these examples: 1776 = MDCCLXXVI. 1954 = MCMLIV 1990 = MCMXC. 2014 = MMXIV (the year of the games of the XXII Olympic Winter Games The current year is MMXIX. The "standard" forms described above reflect typical modern usage rather than an unchanging and universally accepted convention. Usage in ancient Rome varied and remained inconsistent in medieval times. There is still no official "binding" standard, which makes the elaborate "rules" used in some sources to distinguish between "correct" and "incorrect" forms problematic. "Classical" inscriptions not infrequently use IIII for "4" instead of IV. Other "non-subtractive" forms, such as VIIII for IX, are sometimes seen, although they are less common.
On the numbered gates to the colosseum, for instance, IV is systematically avoided in favour of IIII, but other "subtractives" apply, so that gate 44 is labelled XLIIII. Isaac Asimov speculates that the use of "IV", as the initial letters of "IVPITER" may have been felt to have been impious in this context. Clock faces that use Roman numerals show IIII for four o'clock but IX for nine o'clock, a practice that goes back to early clocks such as the Wells Cathedral clock of the late 14th century. However, this is far from universal: for example, the clock on the Palace of Westminster, Big Ben, uses a "normal" IV. XIIX or IIXX are sometimes used for "18" instead of XVIII; the Latin word for "eighteen" is rendered as the equivalent of "two less than twenty" which may be the source of this usage. The standard forms for 98 and 99 are XCVIII and XCIX, as described in the "decimal pattern" section above, but these numbers are rendered as IIC and IC originally from the Latin duodecentum and undecentum.
Sometimes V and L are not used, with instances such as IIIIII and XXXXXX rather than VI or LX. Most non-standard numerals other than those described above - such as VXL for 45, instead of the standard XLV are modern and may be due to error rather than being genuine variant usage. In the early years of the 20th century, different representations of 900 appeared in several inscribed dates. For instance, 1910 is shown on Admiralty Arch, London, as MDCCCCX rather than MCMX, while on the north entrance to the Saint Louis Art Museum, 1903 is inscribed as MDCDIII rather than MCMIII. Although Roman numerals came to be written with letters
Ab urbe condita
Ab urbe condita, or Anno urbis conditæ abbreviated as AUC in either case, is a convention, used in antiquity and by classical historians to refer to a given year in Ancient Rome. Ab urbe condita means "from the founding of the City," while anno urbis conditæ means "in the year since the City's founding." Therefore, the traditional year of the foundation of Rome, 753 BC, would be written AUC 1, while AD 1 would be AUC 754. The foundation of the Empire in 27 BC would be AUC 727. Usage of the term was more common during the Renaissance, when editors sometimes added AUC to Roman manuscripts they published, giving the false impression that the convention was used in antiquity. In reality, the dominant method of identifying years in Roman times was to name the two consuls who held office that year. In late antiquity, regnal years were in use, as was the Diocletian era in Roman Egypt after AD 293, in the Byzantine Empire after AD 537, following a decree by Justinian; the traditional date for the founding of Rome, 21 April 753 BC, is due to Marcus Terentius Varro.
Varro may have used the consular list and called the year of the first consuls "ab urbe condita 245," accepting the 244-year interval from Dionysius of Halicarnassus for the kings after the foundation of Rome. The correctness of this calculation has not been confirmed. From the time of Claudius onward, this calculation superseded other contemporary calculations. Celebrating the anniversary of the city became part of imperial propaganda. Claudius was the first to hold magnificent celebrations in honor of the anniversary of the city, in AD 48, the eight hundredth year from the founding of the city. Hadrian and Antoninus Pius held similar celebrations, in AD 121, in AD 147 and AD 148, respectively. In AD 248, Philip the Arab celebrated Rome's first millennium, together with Ludi saeculares for Rome's alleged tenth sæculum. Coins from his reign commemorate the celebrations. A coin by a contender for the imperial throne, explicitly states "ear one thousand and first", an indication that the citizens of the empire had a sense of the beginning of a new era, a Sæculum Novum.
The Anno Domini year numbering was developed by a monk named Dionysius Exiguus in Rome in AD 525, as a result of his work on calculating the date of Easter. Dionysius did not use the AUC convention, but instead based his calculations on the Diocletian era; this convention had been in use since AD 293, the year of the tetrarchy, as it became impractical to use regnal years of the current emperor. In his Easter table, the year AD 532 was equated with the 248th regnal year of Diocletian; the table counted the years starting from the presumed birth of Christ, rather than the accession of the emperor Diocletian on 20 November AD 284, or as stated by Dionysius: "sed magis elegimus ab incarnatione Domini nostri Jesu Christi annorum tempora praenotare". Blackburn and Holford-Strevens review interpretations of Dionysius which place the Incarnation in 2 BC, 1 BC, or AD 1, it has been calculated that the year AD 1 corresponds to AUC 754, based on the epoch of Varro. Thus, AUC 1 = 753 BC AUC 753 = 1 BC AUC 754 = AD 1 AUC 1000 = AD 247 AUC 1229 = AD 476 AUC 2206 = AD 1453 AUC 2753 = AD 2000 AUC 2772 = AD 2019 List of Latin phrases
The traditional China calendar, or Former Calendar, Traditional Calendar or Lunar Calendar, is a lunisolar calendar which reckons years and days according to astronomical phenomena. It is defined by GB/T 33661-2017, "Calculation and promulgation of the Chinese calendar", issued by the Standardisation Administration of China on 12 May 2017. Although modern day China uses the Gregorian calendar, the traditional Chinese calendar governs holidays in China and in overseas Chinese communities, it lists the dates of traditional Chinese holidays and guides people in selecting auspicious days for weddings, moving, or starting a business. Like Chinese characters, variants of this calendar are used in different parts of the Chinese cultural sphere. Korea and the Ryukyu Islands adopted the calendar, it evolved into Korean and Ryukyuan calendars; the main difference from the traditional Chinese calendar is the use of different meridians, which leads to some astronomical events—and calendar events based on them—falling on different dates.
The traditional Japanese calendar derived from the Chinese calendar, but its official use in Japan was abolished in 1873 as part of reforms after the Meiji Restoration. Calendars in Mongolia and Tibet have absorbed elements of the traditional Chinese calendar, but are not direct descendants of it. Days begin and end at midnight, months begin on the day of the new moon. Years begin on the second new moon after the winter solstice. Solar terms govern the end of each month. Written versions in ancient China included stems and branches of the year and the names of each month, including leap months as needed. Characters indicated whether a month was short; the traditional Chinese calendar was developed between 771 and 476 BC, during the Spring and Autumn period of the Eastern Zhou dynasty. Before the Zhou dynasty, solar calendars were used. One version of the solar calendar is the five-elements calendar. A 365-day year was divided into five phases of 73 days, with each phase corresponding to a Day 1 Wu Xing element.
A phase began followed by six 12-day weeks. Each phase consisted of two three-week months. Years began followed by a bǐngzǐ day and a 72-day fire phase. Other days were tracked using the Yellow River Map. Another version is a four-quarters calendar. Weeks were ten days long, with one month consisting of three weeks. A year had 12 months, with a ten-day week intercalated in summer as needed to keep up with the tropical year; the 10 Heavenly Stems and 12 Earthly Branches were used to mark days. A third version is the balanced calendar. A year was 365.25 days, a month was 29.5 days. After every 16th month, a half-month was intercalated. According to oracle bone records, the Shang dynasty calendar was a balanced calendar with 12 to 14 months in a year; the first lunisolar calendar was the Zhou calendar, introduced under the Zhou dynasty. This calendar set the beginning of the year at the day of the new moon before the winter solstice, it set the shàngyuán as the winter solstice of a dīngsì year, making the year it was introduced around 2,758,130.
Several competing lunisolar calendars were introduced by states fighting Zhou control during the Warring States period. The state of Lu issued its own Lu calendar. Jin issued the Xia calendar in AD 102, with a year beginning on the day of the new moon nearest the March equinox. Qin issued the Zhuanxu calendar, with a year beginning on the day of the new moon nearest the winter solstice. Song's Yin calendar began its year on the day of the new moon after the winter solstice; these calendars are known as the six ancient calendars, or quarter-remainder calendars, since all calculate a year as 365 1⁄4 days long. Months begin on the day of the new moon, a year has 12 or 13 months. Intercalary months are added to the end of the year; the Qiang and Dai calendars are modern versions of the Zhuanxu calendar, used by mountain peoples. After Qin Shi Huang unified China under the Qin dynasty in 221 BC, the Qin calendar was introduced, it followed most of the rules governing the Zhuanxu calendar, but the month order was that of the Xia calendar.
The intercalary month, known as the second Jiǔyuè, was placed at the end of the year. The Qin calendar was used into the Han dynasty. Emperor Wu of Han r. 141 – 87 BC introduced reforms halfway through his reign. His Taichu Calendar defined a solar year as 365 385⁄1539 days, the lunar month was 29 43⁄81 days; this calendar introduced the 24 solar terms. Solar terms were paired, with the 12 combined periods known as climate terms; the first solar term of the period was known as a pre-climate, the second was a mid-climate. Months were named for the mid-climat
The Dragon is the fifth of the 12-year cycle of animals which appear in the Chinese zodiac related to the Chinese calendar. The Year of the Dragon is associated with pronounced chen, it has been proposed by one academic researcher that the Earthly Branch character may have been associated with scorpions. In the Buddhist calendar used in Thailand, Laos and Sri Lanka, the Dragon is replaced by the nāga. In the Gurung zodiac, the Dragon is replaced by the eagle. People born within these date ranges can be said to have been born in the "Year of the Dragon", while bearing the following elemental sign: There are marked spikes in the birth rates of countries that use the Chinese zodiac or places with substantial Overseas Chinese populations during the year of the Dragon, because such "Dragon babies" are considered to be lucky and have desirable characteristics that lead to better life outcomes; the recent phenomenon of planning a child’s birth in the Dragon year has led to hospital overcapacity issues and an uptick in infant mortality rates toward the end of these years due to strained neonatal resources.
Among the 12 animal signs, the Monkey has the most tacit understanding with the Dragon people. The cunning Rat can be a good partner with the Dragon to make something big; the Dragon people can live with the Snake, for the Snake can prevent the Dragon from behaving outrageously. People under the signs of the Rooster, Rabbit, Goat and Horse like to be friends with the Dragon, as they admire the Dragon's beautiful bearing and strength. Two Dragons can get along well with each other. However, the relationship between the Dragon and the Ox people is tense, because both of them are majestic; the people whom the Dragon feels headaches with the most are the Dog people. They feel uncomfortable due to the Dog's close guard
The Snake is the sixth of the 12-year cycle of animals which appear in the Chinese zodiac related to the Chinese calendar. The Year of the Snake is associated with the Earthly Branch symbol 巳. According to one legend, there is a reason for the order of the 12 animals in the 12-year cycle; the story goes that a race was held to cross a great river, the order of the animals in the cycle was based upon their order in finishing the race. In this story, the Snake compensated for not being the best swimmer by hitching a hidden ride on the Horse's hoof, when the Horse was just about to cross the finish line, jumping out, scaring the Horse, thus edging it out for sixth place; the same 12 animals are used to symbolize the cycle of hours in the day, each being associated with a two-hour time period. The "hour" of the Snake is 9:00 to 11:00 a.m. the time when the Sun warms up the Earth, Snakes are said to slither out of their holes. The "month" of the Snake is 5 May to 5 June; the reason the animal signs are referred to as zodiacal is that one's personality is said to be influenced by the animal signs ruling the time of birth, together with elemental aspects of the animal signs within the sexagenary cycle.
The year governed by a particular animal sign is supposed to be characterized by it, with the effects strong for people who were born in any year governed by the same animal sign. In Chinese symbology, Snakes are regarded as intelligent, but with a tendency to be somewhat unscrupulous. People born within these date ranges can be said to have been born in the "Year of the Snake", while bearing the following elemental sign: Note that in Japan the new sign of the zodiac starts on 1 January, while in China it starts, according to the traditional Chinese calendar, at the new moon that falls between 21 January and 20 February, so that persons born in January or February may have two different signs in the two countries; the Snake is the 6th of the 12 signs and belongs to the Second Trine, together with the Ox and the Rooster, with which it is most compatible. Depictions of zodiacal Snakes either solo or in group context with the other eleven zodiacal creatures shows how they have been imagined in the calendrical context.
Snake Snakes in Chinese mythology Snakes in mythology Serpent Eberhard, Wolfram, A Dictionary of Chinese Symbols: Hidden Symbols in Chinese Life and Thought. London, New York: Routledge. ISBN 0-415-00228-1 Vietnam Veterans for Factual History. Indochina in the Year of the Snake, 1965. P. 288. ISBN 9781929932658
Balinese saka calendar
The Balinese saka calendar is one of two calendars used on the Indonesian island of Bali. Unlike the 210-day pawukon calendar, it is based on the phases of the Moon, is the same length as the Gregorian year. Based on a lunar calendar, the saka year comprises sasih, of 30 days each. However, because the lunar cycle is shorter than 30 days, the lunar year has a length of 354 or 355 days, the calendar is adjusted to prevent it losing synchronization with the lunar or solar cycles; the months are adjusted by allocating two lunar days to one solar day every 9 weeks. This day is called ngunalatri, Sanskrit for "minus one night". To stop the Saka from lagging behind the Gregorian calendar – as happens with the Islamic calendar, an extra month, known as an intercalary month, is added after the 11th month, or after the 12th month; the length of these months is calculated according to the normal 63-day cycle. An intercalary month is added whenever necessary to prevent the final day of the 7th month, known as Tilem Kapitu, from falling in the Gregorian month of December.
The names the twelve months are taken from a mixture of Old Balinese and Sanskrit words for 1 to 12, are as follows: Kasa Karo Katiga Kapat Kalima Kanem Kapitu Kawalu Kasanga Kadasa Jyestha SadhaEach month begins the day after a new moon and has 15 days of waxing moon until the full moon 15 days of waning, ending on the new moon. Both sets of days are numbered 1 to 15; the first day of the year is the day after the first new moon in March. Note, that Nyepi falls on the first day of Kadasa, that the years of the Saka era are counted from that date; the calendar is 78 years behind the Gregorian calendar, is calculated from the beginning of the Saka Era in India. It is used alongside the 210-day Balinese pawukon calendar, Balinese festivals can be calculated according to either year; the Indian saka calendar was used for royal decrees as early as the ninth century CE. The same calendar was used in Java until Sultan Agung replaced it with the Javanese calendar in 1633; the Balinese Hindu festival of Nyepi, the day of silence, marks the start of the Saka year.
Tilem Kepitu, the last day of the 7th month, is known as Siva Ratri, is a night dedicated to the god Shiva. Devotees stay up all meditate. There are another 24 ceremonial days in the Saka year celebrated at Purnama. Eiseman, Fred B. Jr, Bali: Sekalia and Niskala Volume I: Essays on Religion and Art pp 182–185, Periplus Editions, 1989 ISBN 0-945971-03-6 Haer, Debbie Guthrie. ISBN 981 3018 496 Hobart, Angela. ISBN 0 631 17687 X Ricklefs, M. C.