Julian period

Julian period

      chronological system now used chiefly by astronomers and based on the consecutive numbering of days from Jan. 1, 4713 BC. Not to be confused with the Julian calendar, the Julian period was proposed by the scholar Joseph Justus Scaliger (Scaliger, Joseph Justus) in 1583 and named by him for his father, Julius Caesar Scaliger. Joseph Scaliger proposed a period of 7,980 years of numbered days to be used in determining time elapsed between various historical events otherwise recorded only in different chronologies, eras, or calendars. The length of 7,980 years was chosen as the product of 28 times 19 times 15; these, respectively, are the numbers of years in the so-called solar cycle of the Julian calendar in which dates recur on the same days of the week; the lunar or Metonic cycle, after which the phases of the Moon recur on a particular day in the solar year, or year of the seasons; and the cycle of indiction, originally a schedule of periodic taxes or government requisitions in ancient Rome. The epoch, or starting point, of 4713 BC was chosen as the nearest past year in which the three cycles began together.

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  • Julian period — Julian Jul ian (?; 277) a. [L. Julianus, fr. Julius. Cf. {July}, {Gillian}.] Relating to, or derived from, Julius C[ae]sar. [1913 Webster] {Julian calendar}, the calendar as adjusted by Julius C[ae]sar, in which the year was made to consist of… …   The Collaborative International Dictionary of English

  • julian period — noun Usage: usually capitalized J Etymology: julian, adjective : a chronological period of 7980 Julian years that combines the solar and lunar cycles and the Roman indiction cycle and is reckoned from the year 4713 B.C. when the first years of… …   Useful english dictionary

  • Julian period —    a unit of time equal to exactly 7980 years in the Julian calendar, that is, exactly 2 914 695 days. See Julian day, above …   Dictionary of units of measurement

  • Julian — Jul ian (?; 277) a. [L. Julianus, fr. Julius. Cf. {July}, {Gillian}.] Relating to, or derived from, Julius C[ae]sar. [1913 Webster] {Julian calendar}, the calendar as adjusted by Julius C[ae]sar, in which the year was made to consist of 365 days …   The Collaborative International Dictionary of English

  • Julian calendar — Julian Jul ian (?; 277) a. [L. Julianus, fr. Julius. Cf. {July}, {Gillian}.] Relating to, or derived from, Julius C[ae]sar. [1913 Webster] {Julian calendar}, the calendar as adjusted by Julius C[ae]sar, in which the year was made to consist of… …   The Collaborative International Dictionary of English

  • Julian epoch — Julian Jul ian (?; 277) a. [L. Julianus, fr. Julius. Cf. {July}, {Gillian}.] Relating to, or derived from, Julius C[ae]sar. [1913 Webster] {Julian calendar}, the calendar as adjusted by Julius C[ae]sar, in which the year was made to consist of… …   The Collaborative International Dictionary of English

  • Julian year — Julian Jul ian (?; 277) a. [L. Julianus, fr. Julius. Cf. {July}, {Gillian}.] Relating to, or derived from, Julius C[ae]sar. [1913 Webster] {Julian calendar}, the calendar as adjusted by Julius C[ae]sar, in which the year was made to consist of… …   The Collaborative International Dictionary of English

  • Julian day — JDN redirects here. For the military IT system, see Joint Data Network. For the comic book character Julian Gregory Day, see Calendar Man. Not to be confused with Julian year (disambiguation). Julian day is used in the Julian date (JD) system of… …   Wikipedia

  • Julian day — (JD)    a continuous count of days beginning with January 1, 4713 BC ( 4712 CE), which is start of what is called the Julian period. The French scholar Joseph Justus Scaliger (1540 1609) introduced the Julian period in 1582 (the same year the… …   Dictionary of units of measurement

  • Julian May — Born July 10, 1931 (1931 07 10) (age 80) Chicago, Illinois Pen name Bob Cunningham, Judy Dikty, Lee N. Falconer, John Feilen, Wolfgang Amadeus Futslogg, Matthew G. Grant, Granny Roseboro, Ian Thorne, Jean Wright Thorne, George Zanderbergen,… …   Wikipedia

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