The " Julian year ", being a uniform measure of duration, should not be confused with the variable length historical years in the Julian calendar.
22.
Because Julian years are not exactly the same length as years on the Gregorian calendar, astronomical epochs will diverge noticeably from the Gregorian calendar in a few hundred years.
23.
For example, in the next 1000 years, seven days will be dropped from the Gregorian calendar but not from 1000 Julian years, so J3000.0 will be.
24.
In the Middle Ages in Europe a number of significant feast days in the ecclesiastical calendar of the Roman Catholic Church came to be used as the beginning of the Julian year:
25.
In 900 Julian years there are = 225 leap days . The Revised Julian leap rule omits seven of nine century leap years, leaving leap days per 900-year cycle.
26.
Julian ) calendar . " Julian " within its name indicates that other Julian epochs can be a number of Julian years of 365.25 days each before or after J2000.0.
27.
In astronomy, the Julian year is a unit of time; it is defined as 365.25 days of exactly seconds ( SI base unit ), totalling exactly seconds in the Julian astronomical year.
28.
This measure of time is not dependent on the length of sidereal year which is not even now precisely equal to the Julian year ( astronomy ) . talk ) 15 : 05, 25 May 2010 ( UTC)
29.
Before 1984, the tropical year ( not the Julian year ) and a measured ( not defined ) speed of light were included in the IAU ( 1964 ) System of Astronomical Constants, used from 1968 to 1983.
30.
The Hipparcos catalog summary, for example, defines the " catalog epoch " as J1991.25 ( 8.75 Julian years before 2000 January 1.5000 TT, e . g ., 1991 April 2.5625 TT ).
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