Julian calendar
The Julian calendar was introduced in 46 BC by Julius Caesar and took force in 45 BC (709 ab urbe condita).
Julian Calendar
The problem with most calendar systems is that they are based on 24-hour days, but the orbital period of the Earth is not an exact multiple of days. Over time, calenders get out of step with the actual orbital period.
Julian Calendar
In the year 46 BC, the Greek convinced Julius Caesar to reform the to a more manageable form. At this time, Julius also changed the number of days in the months to achieve a 365 day year.
Julian calendar: the calendar system introduced by Emperor Julius Caesar and devised by the Greek philosopher (and court astronomer of Egypt) Sosigenes. Widely used from 45BC to 1582AD.
Julian Calendar
(a) Calendar established by Julius Caesar in 46 BC, which overestimated the duration of the sidereal year by 11 minutes and 14 seconds.
Julian Calendar -- Introduced in 46 BC by the Roman ruler Julius Ceasar, this calendar assumes a year of 365.25 days, and uses a cycle in which 3 "ordinary" years of 365 days are followed by a "leap year" with 366 days.
The Revised Julian calendar or, less formally, New Calendar, is a calendar scheme, originated in 1923, ...
The Julian calendar thus assumes a year of 365. 25 days, leaving unaccounted a difference of 0. 0078 days or about 1/128 of a day. Thus the calendar still slips, but at a very slow rate, about one day in 128 years.
The Julian Calendar
In 46 B.C., Julius Caesar reformed the calendar by ordering the year to be 365 days in length and to contain 12 months.
Introduction of the Julian calendar, a purely solar calendar, to the Roman Empire.
31 B.C.-476 A.D.
Roman Empire ...
^ When Julius Caesar introduced the Julian Calendar in 45 BC, December 25 was approximately the date of the solstice. In modern times, the solstice falls on December 21 or 22.
The Julian Date is a running count of days since January 1, 4713 BC, of the Julian Calendar. JD 2450000 corresponds to October 9, 1995. Janet Mattei (American Association of Variable Star Observers), from an article by M. Matsuura et al.
These changes resulted in the creation of the Julian calendar. Well now, this 365.25 days for the Julian calendar was off a bit, the tropical being 365.242199 days. The difference amounts to 11 minutes and 14 seconds per year. So..
cognition in the Julian calendar. Nevertheless, Virgil (Georg. i. 32) regarded the space it presided over as so much waste land, provisionally occupied by the " Claws " of the Scorpion, but readily available for the apotheosis of Augustus.
Correcting at a stroke the 10-day accumulated margin of error of the Julian calendar, the main difference was in fact that century years were discounted as leap years unless they were divisible by 400. [A84] ...
This includes the Orthodox Church of Russia, which maintains the Julian calendar for religious purposes while accepting the use of the Gregorian for purely secular purposes.
The calendar of the western world is based on the Julian calendar, which dates back to the time of Julius Caesar (44 BC).
By comparison, the Julian calendar, used in Europe from Roman times until about the 16th Century, accumulated an error of one day every 128 years. The modern Gregorian calendar accumulates a day's error in approximately 3257 years.
Astronomy ...
Julian Day calendar
The Columbia Encyclopedia, Sixth Edition
Julian calendar
The Oxford Dictionary of Phrase and Fable
Julian calendar
A Dictionary of Astronomy ...
 See also: Calendar, Second, Year, Time, Period
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