The Julian calendar, a reform of the Roman calendar The Roman calendar changed its form several times in the time between the foundation of Rome and the fall of the Roman Empire. This article generally discusses the early Roman or 'pre-Julian' calendars. The calendar used after 46 BC is discussed under Julian calendar, was introduced by Julius Caesar Gaius Julius Caesar was a Roman military and political leader. He played a critical role in the transformation of the Roman Republic into the Roman Empire in 46 BC, and came into force in 45 BC (709 ab urbe condita Ab urbe condita is Latin for "from the founding of the City (Rome)", traditionally set in 753 BC. AUC is a year-numbering system used by some ancient Roman historians to identify particular Roman years. Renaissance editors sometimes added AUC to Roman manuscripts they published, giving the false impression that the Romans usually). It was chosen after consultation with the astronomer Sosigenes of Alexandria Sosigenes of Alexandria was named by Pliny the Elder as the astronomer consulted by Julius Caesar for the design of the Julian calendar. It appears that little or nothing is known about him apart from two references in Pliny's Natural History. Some web sources say that the calendar was designed by Aristarchus about 200 years earlier — it is not and was probably designed to approximate the tropical year A tropical year , for general purposes, is the length of time that the Sun takes to return to the same position in the cycle of seasons, as seen from Earth; for example, the time from vernal equinox to vernal equinox, or from summer solstice to summer solstice. Since antiquity, astronomers have progressively refined the definition of the tropical, known at least since Hipparchus Hipparchus or Hipparch was a Greek astronomer, geographer, and mathematician of the Hellenistic period. It has a regular year of 365 days divided into 12 months, and a leap day February 29 in the Gregorian calendar, the most widely used today, is a date that occurs only once every four years, in years evenly divisible by 4, such as 1996, 2000, 2004, 2008, 2012 or 2016 . These are called leap years. February 29 is the 60th day of the Gregorian calendar in such a year, with 306 days remaining until the end of that year. It is added to February every four years. Hence the Julian year is on average 365.25 days long.
The Julian calendar remained in use into the 20th century in some countries as a national calendar A calendar is a system of organizing days for social, religious, commercial, or administrative purposes. This is done by giving names to periods of time, typically days, weeks, months, and years. The name given to each day is known as a date. Periods in a calendar are usually, though not necessarily, synchronized with the cycle of the sun or the, but it has generally been replaced by the Gregorian calendar The Gregorian calendar is the internationally accepted civil calendar. It was introduced by Pope Gregory XIII, after whom the calendar was named, by a decree signed on 24 February 1582, a papal bull known by its opening words Inter gravissimas. The reformed calendar was adopted later that year by a handful of countries, with other countries introduced by Pope Gregory XIII He was born in the city of Bologna, where he studied law and graduated in 1530. Afterwards, he taught jurisprudence for some years; his students included notable figures such as Alexander Cardinal Farnese, Reginald Cardinal Pole and Carlo Cardinal Borromeo. He had an illegitimate son before he took holy orders in 1582. It is still used by the Berber people Iberians, Saami people of North Africa North Africa or Northern Africa is the northernmost region of the African continent, linked by the Sahara to Sub-Saharan Africa. Geopolitically, the UN definition of Northern Africa includes the following seven countries or territories; Algeria, Egypt, Libya, Morocco, Sudan, Tunisia, and Western Sahara, on Mount Athos Mount Athos is a mountain on the peninsula of the same name in Macedonia, of northern Greece, called in Greek Agion Oros (Άγιον Όρος, transliterated often as Hagion Oros), or in English, "Holy Mountain". In Classical times, the peninsula was called Akté (Ακτή) (sometimes Acte or Akte). Politically it is known in Greece as, and by many national Orthodox The Orthodox Church, also officially called the Orthodox Catholic Church[note 1] and commonly referred to in English-speaking countries as the Eastern Orthodox Church,[note 2] is the world's second largest Christian communion, estimated to number 300 million members churches. Orthodox Churches no longer using the Julian calendar typically use the Revised Julian calendar The Revised Julian calendar or, less formally, New Calendar, is a calendar, originated in 1923, which effectively discontinued the 340 years of divergence between the naming of dates sanctioned by those Eastern Orthodox churches adopting it and the Gregorian calendar that has come to predominate worldwide. In 2800 the two calendars will diverge rather than the Gregorian calendar.
The notation "Old Style" (OS) Old Style and New Style (or N.S.) are used in English language historical studies either to indicate that the start of the Julian year has been adjusted to start on 1 January (NS) even though contemporary documents use a different start of year (OS); or to indicate that a date conforms to the Julian calendar (OS), formerly in use in many countries, is sometimes used to indicate a date in the Julian calendar, as opposed to "New Style" (NS) Old Style and New Style (or N.S.) are used in English language historical studies either to indicate that the start of the Julian year has been adjusted to start on 1 January (NS) even though contemporary documents use a different start of year (OS); or to indicate that a date conforms to the Julian calendar (OS), formerly in use in many countries,, which either represents the Julian date with the start of the year as 1 January or a full mapping onto the Gregorian calendar The Gregorian calendar is the internationally accepted civil calendar. It was introduced by Pope Gregory XIII, after whom the calendar was named, by a decree signed on 24 February 1582, a papal bull known by its opening words Inter gravissimas. The reformed calendar was adopted later that year by a handful of countries, with other countries. This notation is used in reference to dates from tsarist Russia (the country did not switch to the Gregorian calendar until 1918).
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... Revolution in Russia in 1917 took place in November, but at the time it was October in Russia as they had not yet changed from the Julian calendar . 7. ...
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