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Similarly, "year" can mean the orbital period of any planet: for example, a Martian year or a Venusian year are examples of the time a planet takes to transit one complete orbit.

The term can also be used in reference to any long period or cycle, such as the Great Year.

No astronomical year has an integer number of days or lunar months, so any calendar that follows an astronomical year must have a system of intercalation such as leap years.

Financial and scientific calculations often use a 365-day calendar to simplify daily rates.

(hṓra) "year, season, period of time" (whence "hour"), Old Church Slavonic jarŭ, and Latin hornus "of this year".

The academic year may be divided into academic terms, such as semesters or quarters.

When computations are done involving both years AD and years BC, it is common to use Astronomical year numbering, in which 1 BC is designated 0, 2 BC is designated −1, and so on.

Other eras are also used to enumerate the years in different cultural, religious or scientific contexts.

In the Julian calendar, the average (mean) length of a year is 365.25 days.

In a non-leap year, there are 365 days, in a leap year there are 366 days.