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  1. The Julian year is not a 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 365.242 198 ...

  2. In astronomy, a Julian year (symbol: a) is a unit to measure time. It has exactly 365 1 ⁄ 4 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.

  3. en.wikipedia.org › wiki › Julian_yearJulian year - Wikipedia

    Julian year may refer to: Julian year (astronomy), a time interval of exactly 365.25 Earth days. Julian year (calendar), a year in the Julian calendar that is either 365 or 366 days, or 365.25 days on average. This disambiguation page lists articles associated with the title Julian year.

  4. en.wikipedia.org › wiki › YearYear - Wikipedia

    In astronomy, the Julian year is a unit of time defined as 365.25 days of exactly 86,400 seconds (SI base unit), totalling exactly 31,557,600 seconds in the Julian astronomical year. [1] The word year is also used for periods loosely associated with, but not identical to, the calendar or astronomical year, such as the seasonal year , the fiscal year , the academic year , etc.

  5. En astronomía, un año juliano (símbolo: a) es una unidad de medida de tiempo definida como exactamente 365,25 días de 86 400 SI segundos cada uno. La duración del año juliano es la duración media del año en el calendario juliano que se utilizó en las sociedades occidentales hasta la adopción del calendario gregoriano, y de la que se nombra la unidad.