Julian Year: Unit of time and a version of the year often used in astronomy

In astronomy, a Julian year (symbol: a) is a unit to measure time.

It has exactly 365​14 days of 86,400 seconds each. That 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 a Julian year measures duration rather than designates date, the 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 (for which, see Year). It is also not connected to the Julian day used in astronomy.

References

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AstronomyCalendarCenturyDayJulian calendarJulian daySecondTimeUnitUnits of measurementYear

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