:: . . . and for extra credit, ask your teacher whether their " year " is a Julian year, a sidereal year or a tropical year ( but only once you understand the difference between those terms yourself ) . talk ) 16 : 05, 15 May 2009 ( UTC)
42.
That depends on the length of your year : the common year of 365 days, the Julian year of 365.25 days, the Gregorian year of 365.2425 days, the sidereal year of 365.256 363 051 days, or some other year entirely .-- Carnildo 06 : 39, 4 January 2007 ( UTC)
43.
In Britain and its Colonies, where 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, rather than the Gregorian calendar ( NS ).
44.
This is to be distinguished from the " astronomical year numbering ", introduced in 1740 by French astronomer Jacques Cassini, which considers each New Year an integer on a time axis, with year 0 corresponding to 1 BC, and " year-1 " corresponding to 2 BC, so that in this system, Julian year leap years have a number divisible by four.
45.
As 218 out of every 900 years are leap years, the average ( mean ) length of this Julian year is days, which is closer to the length of the mean tropical year, days, than is the Gregorian mean year, 365.242 5 days . In the year 2800 CE, the Gregorian and Revised Julian calendars will begin to differ by one calendar day.
46.
:Note that a light-year is the distance which light travels in a vacuum in one Julian year ( astronomy ) which is 31, 557, 600 SI seconds ( with each second defined as " the duration of 9, 192, 631, 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom " ).
47.
The joint document says that definitions such as the Julian year " bear an inherent, pre-programmed obsolescence because of the variability of Earth s orbital movement ", but then proposes using the length of the tropical year as of 2000 AD ( specified down to the millisecond ), which of course suffers from the same problem . ( The tropical year oscillates with time by more than a minute .)
48.
Old Style and New Style ( N . S . ) indicate either whether the start of the Julian year has been adjusted to start on 1 January ( N . S . ) even though documents written at the time use a different start of year ( O . S . ), or whether a date conforms to the Julian calendar ( O . S . ) rather than the Gregorian ( N . S . ).
49.
Although many references say that the " Julian " in " Julian Period " refers to Scaliger's father, Julius Scaliger, in the introduction to Book V of his " " ( " Work on the Emendation of Time " ) he states, " " " ", which translates more or less as " We have called it Julian merely because it is accommodated to the Julian year . " Thus " Julian " refers to Julius Caesar, who introduced the Julian calendar in 46 BC.
50.
In addition, an epoch optionally prefixed by " J " and designated as a year with decimals ( 2000 + x ), where x is positive or negative and quoted to 1 or 2 decimal places, has come to mean a date that is an interval of x Julian years of 365.25 days away from the epoch J2000 = JD 2451545.0 ( TT ), still corresponding ( in spite of the use of the prefix " J " or word " Julian " ) to the Gregorian calendar date of 2000 Jan 1 at 12h TT ( about 64 seconds before noon UTC on the same calendar day ) . ( See also Julian year ( astronomy ) . ) Like the Besselian epoch, an arbitrary Julian epoch is therefore related to the Julian date by
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