Years
Years
Years (pronunciation: /jɪərz/) is a unit of time, typically used to measure periods or durations. The term is derived from the Old English 'gear', which itself comes from the Proto-Germanic '*jērą'.
Definition
A year is the time taken by the Earth to make one revolution around the Sun. The standard unit of time, the year, is based on this period. It is approximately 365.25 days long, with a leap year occurring every four years to account for the extra quarter day.
Types of Years
There are several types of years, each with its own specific definition and use. These include:
- Calendar Year: This is the most common type of year and is used in most calendar systems. It is defined as exactly 365 days in most years, with a leap year of 366 days occurring every four years.
- Sidereal Year: This is the time it takes for the Earth to orbit the Sun once with respect to the stars. It is approximately 20 minutes longer than the tropical year.
- Tropical Year: This is the time it takes for the Sun to return to the same position in the cycle of seasons. It is the basis for the year used in most calendars.
- Anomalistic Year: This is the time between successive passages of the Earth through perihelion, the point in its orbit closest to the Sun.
Related Terms
- Leap Year: A year, occurring once every four years, which has 366 days including 29 February as an intercalary day.
- Common Year: A calendar year with 365 days, in contrast to a leap year.
- Julian Year: A unit of time, defined as exactly 365.25 days of 86400 SI seconds each.
- Gregorian Year: The time it takes for the Earth to orbit the Sun once, according to the Gregorian calendar. It is approximately 365.2425 days long.
External links
- Medical encyclopedia article on Years
- Wikipedia's article - Years
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