Year

A year (from Old English gēar) is the orbital period of the Earth moving around the Sun. For an observer on the Earth, this corresponds to the period it takes the Sun to complete one course throughout the zodiac along the ecliptic.

In astronomy, the Julian year is a unit of time, defined as 365.25 days of 86400 SI seconds each (no leap seconds).

There is no universally accepted symbol for the year as a unit of time. The International System of Units does not propose one. A common abbreviation in international use is a (for Latin annus), in English also y or yr.

Due to the Earth's axial tilt, the course of a year sees the passing of the seasons, marked by changes in weather, hours of daylight, and consequently vegetation and fertility. In temperate and subpolar regions, generally four seasons are recognized: spring, summer, autumn and winter, astronomically marked by the Sun reaching the points of equinox and solstice, although the climatic seasons lag behind their astronomical markers. In some tropical and subtropical regions it is more common to speak of the rainy (or wet, or monsoon) season versus the dry season.

A calendar year is an approximation of the Earth's orbital period in a given calendar. A calendar year in the Gregorian calendar (as well as in the Julian calendar) has either 365 (common years) or 366 (leap years) days.

The word "year" is also used of periods loosely associated but not strictly identical with either the astronomical or the calendar year, such as the seasonal year, the fiscal year or the academic year, etc. By extension, the term year can mean the orbital period of any planet: for example, a "Martian year" is the time in which Mars completes its own orbit. The term is also applied more broadly to any long period or cycle, such as the "Great Year".

Read more about Year:  Etymology, Seasonal Year, Calendar Year, Symbol

Other articles related to "year, years":

Julian Calendar - New Year's Day
... The Roman calendar began the year on 1 January, and this remained the start of the year after the Julian reform ... aligned to the Julian calendar, they started the new year on different dates ... in Egypt started on 29 August (30 August after an Alexandrian leap year) ...
298
... Year 298 (CCXCVIII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar ... At the time, it was known as the Year of the Consulship of Faustus and Gallus (or, less frequently, year 1051 Ab urbe condita) ... The denomination 298 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years ...
Guatemala City - Climate
... almost springlike, throughout the course of the year ... the dry season covers the remainder of the year ...
595
... Year 595 (DXCV) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar ... The denomination 595 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years ...
"Great Years" - Galactic Year
... The Galactic year is the time it takes Earth's solar system to revolve once around the galactic center ... It comprises roughly 230 million Earth years ...

Famous quotes containing the word year:

    A year at the breast is quite enough; children who are suckled longer are said to grow stupid, and I am all for popular sayings.
    Honoré De Balzac (1799–1850)

    A writer is in danger of allowing his talent to dull who lets more than a year go past without finding himself in his rightful place of composition, the small single unluxurious “retreat” of the twentieth century, the hotel bedroom.
    Cyril Connolly (1903–1974)

    The three practical rules, then, which I have to offer, are,— 1. Never read any book that is not a year old. 2. Never read any but famed books. 3. Never read any but what you like.
    Ralph Waldo Emerson (1803–1882)