Julian year (astronomy)
In astronomy, a Julian year (symbol: a) is a unit of measurement of time defined as exactly 365.25 days of 86,400 SI seconds each. The Julian year is the average length of the year in the Julian calendar used in Western societies in previous centuries, and for which the unit is named. Nevertheless, because an astronomical Julian year measures duration rather than designating a date, this Julian year does not correspond to years in the Julian calendar or any other calendar. Nor does it correspond to the many other ways of defining a year.
The Julian year is not a fundamental unit of measurement in the International System of Units (SI), but it is recognized by the International Astronomical Union (IAU) as a non-SI unit for use in astronomy. Before 1984, both the Julian year and the mean tropical year were used by astronomers. In 1898, Simon Newcomb used both in his Tables of the Sun in the form of the Julian century (36,525 days) and the "solar century" (36,524.22 days), a rounded form of 100 mean tropical years of 365.24219879 d each according to Newcomb. However, the mean tropical year is not suitable as a unit of measurement because it varies from year to year by a small amount, 6.14×10−8 days according to Newcomb. In contrast, the Julian year is defined in terms of SI units so is as accurate as those units and is constant. It approximates both the sidereal year and the tropical year to about ±0.008 days. The Julian year is the basis of the definition of the light-year as a unit of measurement of distance.
In astronomy, an epoch specifies a precise moment in time. The positions of celestial objects and events, as measured from earth, change over time, so when measuring or predicting celestial positions, the epoch to which they pertain must be specified. A new standard epoch is chosen about every 50 years.
The standard epoch in use today is Julian epoch J2000.0. It is exactly 12:00 TT (close to but not exactly Greenwich mean noon) on January 1, 2000 in the Gregorian (not 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. For example, the future epoch J2100.0 will be exactly 36,525 days (one Julian century) from J2000.0 on January 1, 2100 (the dates will still agree because the Gregorian century 2000–2100 will have the same number of days as a Julian century).
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. For example, in the next 1000 years, seven days will be dropped from the Gregorian calendar but not from 1000 Julian years, so J3000 will be January 8, 3000 12:00 TT.
Julian calendar distinguished 
The Julian year, being a uniform measure of duration, should not be confused with the variable length historical years in the Julian calendar. An astronomical Julian year is never individually numbered. Astronomers follow the same calendar conventions that are accepted in the world community: They use the Gregorian calendar for events since its introduction on October 15, 1582 (or later, depending on country), and the Julian calendar for events before that date.
Julian day distinguished 
A Julian year should not be confused with the Julian day (also Julian day number or JDN), which is also used in astronomy. Despite the similarity of names, there is little connection between the two. It is a way of expressing a date as the integer number of days that have elapsed since a reference date or initial epoch. The Julian day uniquely specifies a date without reference to its day, month, or year in any particular calendar. A specific time within a day is specified via a decimal fraction.
- P. Kenneth Seidelmann, ed., The explanatory supplement to the Astronomical Almanac, (Mill Valley, Cal.: University Science Books, 1992), pp. 8, 696, 698-9, 704, 716, 730. A day is the fundamental unit of time in astronomy, not a second.
- "Measuring the Universe". International Astronomical Union. Retrieved March 22, 2012.
- International Astronomical Union. "Recommendations Concerning Units". Retrieved February 18, 2007. Reprinted from the "IAU Style Manual" by G.A. Wilkinson, Comm. 5, in IAU Transactions XXB (1987).
- Harold Rabinowitz and Suzanne Vogel, The manual of scientific style (Burlington, MA: Academic Press, 2009) 369.
- Simon Newcomb, Tables of the four inner planets, vol. 6 of Astronomical papers prepared for the use of the American Ephemeris and Nautical Almanac (Washington, DC: 1898) 10–11.
- Michael Allison (@ Goddard Institute for Space Studies) (2001). "What is a "Year" (on Earth or Mars)?". pweb.jps.net. Retrieved 2011-07-26.