Julian year
Encyclopedia
A Julian year can refer to:
- The Julian year (astronomy)Julian year (astronomy)In astronomy, a Julian year is a unit of measurement of time defined as exactly 365.25 days of 86 400 SI seconds each, totaling 31 557 600 seconds. 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...
is a time interval of exactly 365.25 Earth days, used in astronomyAstronomyAstronomy is a natural science that deals with the study of celestial objects and phenomena that originate outside the atmosphere of Earth...
. - The Julian year (calendar) is a year in the Julian calendarJulian calendarThe Julian calendar began in 45 BC as a reform of the Roman calendar by Julius Caesar. It was chosen after consultation with the astronomer Sosigenes of Alexandria and was probably designed to approximate the tropical year .The Julian calendar has a regular year of 365 days divided into 12 months...
which has started on different days, at different times, in different countries and is equal to either 365 or 366 days, or 365.25 days on average.