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year

Also known as anno, annum

thumb|alt=see caption|upright=1.5|An animation of the inner Solar System planets' orbit around the Sun. The duration of the year is the time taken to go around the Sun. A year is a unit of time based on how long it takes the Earth to orbit the Sun. In scientific use, the tropical year (approximately 365 solar days, 5 hours, 48 minutes, 45 seconds) and the sidereal year (about 20 minutes longer) are more exact. The modern calendar year, as reckoned according to the Gregorian calendar, approximates the tropical year by using a system of leap years.

AI overview

A year is the time it takes for Earth to complete one full orbit around the Sun, and it serves as a fundamental unit for measuring time in our calendar systems. The exact length varies slightly depending on how it's measured—the tropical year used in our everyday calendar is approximately 365 days, 5 hours, 48 minutes, and 45 seconds, which we account for by adding leap years to keep our calendars aligned with Earth's actual position relative to the Sun.

AI-generated from the Wikipedia summary — may contain errors.

Wikidata facts

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equivalent class: dbpedia.org/ontology/Year
Commons category: Years
conversion to standard unit: 365.25
Wikidata time precision: 9
unit symbol: a
exact match: www.w3.org/TR/owl-time/#time:unitYear
P8168: 2NE1
conversion to SI unit: 31557600

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~30 min read

Article

37 sections

Contents

Calendar year
Abbreviation
Etymology
Intercalation
Julian calendar
Revised Julian calendar
Gregorian calendar
Other calendars
Year numbering
Pragmatic divisions
Fiscal year
Academic year
Astronomical years
Julian year
Sidereal, tropical, and anomalistic years
Draconic year {{anchor|Draconitic year}}
Full moon cycle
Lunar year
Vague year
Heliacal year
Sothic year
Gaussian year
Besselian year
Variation in the length of the year and the day
Summary
Greater astronomical years
Equinoctial cycle
Galactic year
IUPAC–IUGS proposal
Seasonal year
Symbols and abbreviations
SI prefix multipliers
Abbreviations for "years ago"
See also
References
Notes
Further reading

The term 'year' is also used to indicate other periods of roughly similar duration, such as the lunar year (a roughly 354-day cycle of twelve of the Moon's phasessee lunar calendar), as well as periods loosely associated with the calendar or astronomical year, such as the seasonal year, the fiscal year, the academic year, etc.