Year - wikipedia Year A year is the orbital period of the Earth moving in its orbit around the Sun. Due to the Earth 's axial tilt, the course of a year sees the passing of the seasons, marked by changes in weather, the hours of daylight, and, consequently, vegetation and soil fertility. In temperate and subpolar regions around the globe, four seasons are generally recognized : spring, summer, autumn and winter. In tropical and subtropical regions several geographical sectors do not present defined seasons ; but in the seasonal tropics, the annual wet and dry seasons are recognized and tracked. A calendar year is an approximation of the number of days of the Earth 's orbital period as counted in a given calendar. The Gregorian, or modern, calendar, presents its calendar year to be either a common year of 365 days or a leap year of 366 days, as do the Julian calendars ; see below. For the Gregorian calendar the average length of the calendar year ( the mean year ) across the complete leap cycle of 400 years is 365.2425 days. The ISO standard ISO 80000 - 3, Annex C, supports the symbol `` a '' ( for Latin annus ) to represent a year of either 365 or 366 days. In English, the abbreviations `` y '' and `` yr '' are commonly used. In astronomy, the Julian year is a unit of time ; it is defined as 365.25 days of exactly 7004864000000000000 ♠ 86 400 seconds ( SI base unit ), totalling exactly 7007315576000000000 ♠ 31 557 600 seconds in the Julian astronomical year. The word `` year '' is also used for periods loosely associated with, but not identical to, the calendar or astronomical year, such as the seasonal year, the fiscal year, the academic year, etc. 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. Contents 1 Etymology 2 Civil year 2.1 In international calendars 2.2 In the Persian calendar 2.3 Fiscal year 2.4 Academic year 2.5 In the International System of Quantities 3 Astronomical years 3.1 Julian year 3.2 Sidereal, tropical, and anomalistic years 3.3 Draconic year 3.4 Full moon cycle 3.5 Lunar year 3.6 Vague year 3.7 Heliacal year 3.8 Sothic year 3.9 Gaussian year 3.10 Besselian year 3.11 Variation in the length of the year and the day 3.11. 1 Numerical value of year variation 3.12 Summary 4 `` Greater '' astronomical years 4.1 Equinoctial cycle 4.2 Galactic year 5 Seasonal year 6 Symbols 6.1 Symbol 6.1. 1 SI prefix multipliers 6.2 Abbreviations yr and ya 7 See also 8 References 8.1 Notes 9 Further reading 10 External links Etymology Look up year, annus, or ἔτος in Wiktionary, the free dictionary. English year ( via West Saxon ġēar ( jɛar ), Anglian ġēr ) continues Proto - Germanic * jǣran ( * j ē1 ran ). Cognates are German Jahr, Old High German jār, Old Norse ár and Gothic jer, from the Proto - Indo - European noun Reconstruction : Proto - Indo - European / yeh1 - * yeh1r - om `` year, season ''. Cognates also descended from the same Proto - Indo - European noun ( with variation in suffix ablaut ) are Avestan yārǝ `` year '', Greek ὥρα `` year, season, period of time '' ( whence `` hour '' ), Old Church Slavonic jarŭ, and Latin hornus `` of this year ''. Latin annus ( a 2nd declension masculine noun ; annum is the accusative singular ; annī is genitive singular and nominative plural ; annō the dative and ablative singular ) is from a PIE noun * h2et - no -, which also yielded Gothic aþn `` year '' ( only the dative plural aþnam is attested ). Both * yeh1 - ro - and * h2et - no - are based on verbal roots expressing movement, * h1ey - and * h2et - respectively, both meaning `` to go '' generally ( compare Vedic Sanskrit éti `` goes '', atasi `` thou goest, wanderest '' ). Derived from Latin annus are a number of English words, such as annual, annuity, anniversary, etc. ; per annum means `` each year '', anno Domini means `` in the year of the Lord ''. The Greek word for `` year '', ἔτος, is cognate with Latin vetus `` old '', from the PIE word * wetos - `` year '', also preserved in this meaning in Sanskrit vat - sa - ras `` year '' and vat - sa - `` yearling ( calf ) '', the latter also reflected in Latin vitulus `` bull calf '', English wether `` ram '' ( Old English weðer, Gothic wiþrus `` lamb '' ). In some languages, it is common to count years by referencing to one season, as in `` summers '', or `` winters '', or `` harvests ''. Examples include Chinese 年 `` year '', originally 秂, an ideographic compound of a person carrying a bundle of wheat denoting `` harvest ''. Slavic besides godŭ `` time period ; year '' uses lěto `` summer ; year ''. Civil year This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( November 2014 ) 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. In International calendars 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. A leap year occurs every fourth year, or leap year, during which a leap day is intercalated into the month of February. The name `` Leap Day '' is applied to the added day. The Gregorian calendar attempts to cause the northward equinox to fall on or shortly before March 21 and hence it follows the northward equinox year, or tropical year. Because 97 out of 400 years are leap years, the mean length of the Gregorian calendar year is 365.242 5 days ; this is within one ppm of the current length of the mean tropical year ( 365.242 19 days ) and even closer to the current March equinox year of 365.242 374 days that it aims to match. It is estimated that by the year 4000 CE, the northward equinox will fall back by one day in the Gregorian calendar, not because of this difference, but due to the slowing of the Earth 's rotation and the associated lengthening of the day. The Revised Julian calendar, as used in some Eastern Orthodox Churches, currently does a better job than the Gregorian in synchronizing with the mean tropical year. As 218 out of every 900 years are leap years, the average ( mean ) length of this Julian year is 7002365242222200000 ♠ 365.242 2222 days, which is closer to the length of the mean tropical year, 7002365242190000000 ♠ 365.242 19 days, than is the Gregorian mean year, 365.242 5 days. In the year 2800 CE, the Gregorian and Revised Julian calendars will begin to differ by one calendar day. A calendar era assigns a cardinal number to each sequential year, using a reference point in the past as the beginning of the era. Worldwide, the most commonly used calendar era is referenced from the traditional -- now believed incorrect -- year of the birth of Jesus. Dates in this era are designated Anno Domini ( Latin for in the year of the Lord ), abbreviated AD, or the secular common era, abbreviated CE. The year before 1 AD, or 1 CE, is designated 1 Before Christ ( BC ), or 1 Before the Common Era ( BCE ), and the year before that is 2 BC / 2 BCE, etc. ; hence, there was no year 0 AD / 0 CE. 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 Persian calendar The Persian calendar, in use in Afghanistan and Iran, has its year begin at the midnight closest to the instant of the northward equinox as determined by astronomical computation ( for the time zone of Tehran ), as opposed to using an algorithmic system of leap years. Fiscal year A fiscal year or financial year is a 12 - month period used for calculating annual financial statements in businesses and other organizations. In many jurisdictions, regulations regarding accounting require such reports once per twelve months, but do not require that the twelve months constitute a calendar year. For example, in Canada and India the fiscal year runs from April 1 ; in the United Kingdom it runs from April 1 for purposes of corporation tax and government financial statements, but from April 6 for purposes of personal taxation and payment of state benefits ; in Australia it runs from July 1 ; while in the United States the fiscal year of the federal government runs from October 1. Academic year An academic year is the annual period during which a student attends an educational institution. The academic year may be divided into academic terms, such as semesters or quarters. The school year in many countries starts in August or September and ends in May, June or July. In Israel the academic year begins around October or November, aligned with the second month of the Hebrew Calendar. Some schools in the UK and USA divide the academic year into three roughly equal - length terms ( called trimesters or quarters in the USA ), roughly coinciding with autumn, winter, and spring. At some, a shortened summer session, sometimes considered part of the regular academic year, is attended by students on a voluntary or elective basis. Other schools break the year into two main semesters, a first ( typically August through December ) and a second semester ( January through May ). Each of these main semesters may be split in half by mid-term exams, and each of the halves is referred to as a quarter ( or term in some countries ). There may also be a voluntary summer session and / or a short January session. Some other schools, including some in the United States, have four marking periods. Some schools in the United States, notably Boston Latin School, may divide the year into five or more marking periods. Some state in defense of this that there is perhaps a positive correlation between report frequency and academic achievement. There are typically 180 days of teaching each year in schools in the USA, excluding weekends and breaks, while there are 190 days for pupils in state schools in Canada, New Zealand and the United Kingdom, and 200 for pupils in Australia. In India the academic year normally starts from June 1 and ends on May 31. Though schools start closing from mid-March, the actual academic closure is on May 31 and in Nepal it starts from July 15. Schools and universities in Australia typically have academic years that roughly align with the calendar year ( i.e., starting in February or March and ending in October to December ), as the southern hemisphere experiences summer from December to February. In the International System of Quantities Main article : ISO 80000 - 3 In the International System of Quantities, the year ( symbol, a ) is defined as either 365 days or 366 days. Astronomical years Julian year Main article : Julian year ( astronomy ) The Julian year, as used in astronomy and other sciences, is a time unit defined as exactly 365.25 days. This is the normal meaning of the unit `` year '' ( symbol `` a '' from the Latin annus ) used in various scientific contexts. The Julian century of 7004365250000000000 ♠ 36 525 days and the Julian millennium of 7005365250000000000 ♠ 365 250 days are used in astronomical calculations. Fundamentally, expressing a time interval in Julian years is a way to precisely specify how many days ( not how many `` real '' years ), for long time intervals where stating the number of days would be unwieldy and unintuitive. By convention, the Julian year is used in the computation of the distance covered by a light - year. In the Unified Code for Units of Measure, the symbol, a ( without subscript ), always refers to the Julian year, a, of exactly 7007315576000000000 ♠ 31 557 600 seconds. 365.25 days of 7004864000000000000 ♠ 86 400 seconds = 1 a = 1 a = 7001315576000000000 ♠ 31.5576 Ms The SI multiplier prefixes may be applied to it to form ka ( kiloannus ), Ma ( megaannus ), etc. Sidereal, tropical, and anomalistic years The relations among these are considered more fully in Axial precession ( astronomy ). Each of these three years can be loosely called an astronomical year. The sidereal year is the time taken for the Earth to complete one revolution of its orbit, as measured against a fixed frame of reference ( such as the fixed stars, Latin sidera, singular sidus ). Its average duration is 7002365256363004000 ♠ 365.256 363 004 mean solar days ( 365 d 6 h 9 min 9.76 s ) ( at the epoch J2000. 0 = January 1, 2000, 12 : 00 : 00 TT ). Today the mean tropical year is defined as the period of time for the mean ecliptic longitude of the Sun to increase by 360 degrees. Since the Sun 's ecliptic longitude is measured with respect to the equinox, the tropical year comprises a complete cycle of the seasons ; because of the biological and socio - economic importance of the seasons, the tropical year is the basis of most calendars. The modern definition of mean tropical year differs from the actual time between passages of, e.g., the northward equinox for several reasons explained below. Because of the Earth 's axial precession, this year is about 20 minutes shorter than the sidereal year. The mean tropical year is approximately 365 days, 5 hours, 48 minutes, 45 seconds, using the modern definition. ( = 7002365242190000000 ♠ 365.242 19 days of 86400 SI seconds ) The anomalistic year is the time taken for the Earth to complete one revolution with respect to its apsides. The orbit of the Earth is elliptical ; the extreme points, called apsides, are the perihelion, where the Earth is closest to the Sun ( January 3 in 2011 ), and the aphelion, where the Earth is farthest from the Sun ( July 4 in 2011 ). The anomalistic year is usually defined as the time between perihelion passages. Its average duration is 7002365259636000000 ♠ 365.259 636 days ( 365 d 6 h 13 min 52.6 s ) ( at the epoch J2011. 0 ). Draconic year The draconic year, draconitic year, eclipse year, or ecliptic year is the time taken for the Sun ( as seen from the Earth ) to complete one revolution with respect to the same lunar node ( a point where the Moon 's orbit intersects the ecliptic ). The year is associated with eclipses : these occur only when both the Sun and the Moon are near these nodes ; so eclipses occur within about a month of every half eclipse year. Hence there are two eclipse seasons every eclipse year. The average duration of the eclipse year is 7002346620075883000 ♠ 346.620 075 883 days ( 346 d 14 h 52 min 54 s ) ( at the epoch J2000. 0 ). This term is sometimes erroneously used for the draconic or nodal period of lunar precession, that is the period of a complete revolution of the Moon 's ascending node around the ecliptic : 7001186128159320000 ♠ 18.612 815 932 Julian years ( 7003679833101900000 ♠ 6798. 331 019 days ; at the epoch J2000. 0 ). Full Moon cycle The full moon cycle is the time for the Sun ( as seen from the Earth ) to complete one revolution with respect to the perigee of the Moon 's orbit. This period is associated with the apparent size of the full moon, and also with the varying duration of the synodic month. The duration of one full moon cycle is : 7002411784430290000 ♠ 411.784 430 29 days ( 411 days 18 hours 49 minutes 34 seconds ) ( at the epoch J2000. 0 ). Lunar year The lunar year comprises twelve full cycles of the phases of the Moon, as seen from Earth. It has a duration of approximately 354.37 days. Muslims use this for celebrating their Eids and for marking the start of the fasting month of Ramadan. A Muslim calendar year is based on the lunar cycle. Vague year The vague year, from annus vagus or wandering year, is an integral approximation to the year equaling 365 days, which wanders in relation to more exact years. Typically the vague year is divided into 12 schematic months of 30 days each plus 5 epagomenal days. The vague year was used in the calendars of Ancient Egypt, Iran, Armenia and in Mesoamerica among the Aztecs and Maya. It is still used by many Zoroastrian communities. Heliacal year A heliacal year is the interval between the heliacal risings of a star. It differs from the sidereal year for stars away from the ecliptic due mainly to the precession of the equinoxes. Sothic year The Sothic year is the interval between heliacal risings of the star Sirius. It is currently less than the sidereal year and its duration is very close to the Julian year of 365.25 days. Gaussian year The Gaussian year is the sidereal year for a planet of negligible mass ( relative to the Sun ) and unperturbed by other planets that is governed by the Gaussian gravitational constant. Such a planet would be slightly closer to the Sun than Earth 's mean distance. Its length is : 7002365256898300000 ♠ 365.256 8983 days ( 365 d 6 h 9 min 56 s ). Besselian year The Besselian year is a tropical year that starts when the ( fictitious ) mean Sun reaches an ecliptic longitude of 280 °. This is currently on or close to January 1. It is named after the 19th - century German astronomer and mathematician Friedrich Bessel. The following equation can be used to compute the current Besselian epoch ( in years ) : B = 1900.0 + ( Julian date − 7006241502031352000 ♠ 2415020. 313 52 ) / 7002365242198781000 ♠ 365.242 198 781 The TT subscript indicates that for this formula, the Julian date should use the Terrestrial Time scale, or its predecessor, ephemeris time. Variation in the length of the year and the day This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( October 2012 ) The exact length of an astronomical year changes over time. The positions of the equinox and solstice points with respect to the apsides of Earth 's orbit change : the equinoxes and solstices move westward relative to the stars because of precession, and the apsides move in the other direction because of the long - term effects of gravitational pull by the other planets. Since the speed of the Earth varies according to its position in its orbit as measured from its perihelion, Earth 's speed when in a solstice or equinox point changes over time : if such a point moves toward perihelion, the interval between two passages decreases a little from year to year ; if the point moves towards aphelion, that period increases a little from year to year. So a `` tropical year '' measured from one passage of the northward ( `` vernal '' ) equinox to the next, differs from the one measured between passages of the southward ( `` autumnal '' ) equinox. The average over the full orbit does not change because of this, so the length of the average tropical year does not change because of this second - order effect. Each planet 's movement is perturbed by the gravity of every other planet. This leads to short - term fluctuations in its speed, and therefore its period from year to year. Moreover, it causes long - term changes in its orbit, and therefore also long - term changes in these periods. Tidal drag between the Earth and the Moon and Sun increases the length of the day and of the month ( by transferring angular momentum from the rotation of the Earth to the revolution of the Moon ) ; since the apparent mean solar day is the unit with which we measure the length of the year in civil life, the length of the year appears to decrease. The rotation rate of the Earth is also changed by factors such as post-glacial rebound and sea level rise. Numerical value of year variation Mean year lengths in this section are calculated for 2000, and differences in year lengths, compared to 2000, are given for past and future years. In the tables a day is 86,400 SI seconds long. Mean year lengths for 2000 Type of year Days Hours Minutes Seconds Tropical 365 5 48 45 Sidereal 365 6 9 10 Anomalistic 365 6 13 53 Eclipse 346 14 52 55 Year length difference from 2000 ( seconds ; positive when length for tabulated year is greater than length in 2000 ) Year Tropical Sidereal Anomalistic Eclipse − 4000 − 8 − 45 − 15 − 174 − 2000 − 19 − 11 − 116 0 7 − 4 − 5 − 57 2000 0 0 0 0 4000 − 14 − 3 5 54 6000 − 35 − 12 10 104 Summary Days Year type 346.62 Draconic, also called eclipse. 354.37 Lunar. 365 Vague, and a common year in many solar calendars. 7002365242190000000 ♠ 365.242 19 Tropical, also called solar, averaged and then rounded for epoch J2000. 0. 7002365242500000000 ♠ 365.2425 Gregorian, on average. 7002365250000000000 ♠ 365.25 Julian. 7002365256360000000 ♠ 365.256 36 Sidereal, for epoch J2000. 0. 7002365259636000000 ♠ 365.259 636 Anomalistic, averaged and then rounded for epoch J2011. 0. 366 Leap in many solar calendars. An average Gregorian year is 365.2425 days ( 52.1775 weeks, 7003876582000000000 ♠ 8765. 82 hours, 7005525949199999999 ♠ 525 949. 2 minutes or 7007315569520000000 ♠ 31 556 952 seconds ). For this calendar, a common year is 365 days ( 7003876000000000000 ♠ 8760 hours, 7005525600000000000 ♠ 525 600 minutes or 7007315360000000000 ♠ 31 536 000 seconds ), and a leap year is 366 days ( 7003878400000000000 ♠ 8784 hours, 7005527040000000000 ♠ 527 040 minutes or 7007316224000000000 ♠ 31 622 400 seconds ). The 400 - year cycle of the Gregorian calendar has 7005146097000000000 ♠ 146 097 days and hence exactly 7004208710000000000 ♠ 20 871 weeks. `` Greater '' astronomical years Equinoctial cycle The Great Year, or equinoctial cycle, corresponds to a complete revolution of the equinoxes around the ecliptic. Its length is about 25,700 years, and can not be determined precisely enough yet, as the precession speed depends on too many factors, causing not yet predictable variation. 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. Seasonal year Further information : Effect of sun angle on climate A seasonal year is the time between successive recurrences of a seasonal event such as the flooding of a river, the migration of a species of bird, the flowering of a species of plant, the first frost, or the first scheduled game of a certain sport. All of these events can have wide variations of more than a month from year to year. Symbols In the International System of Quantities the symbol for the year as a unit of time is a, taken from the Latin word annus. In English, the abbreviations `` y '' or `` yr '' are more commonly used in non-scientific literature, but also specifically in geology and paleontology, where `` kyr, myr, byr '' ( thousands, millions, and billions of years, respectively ) and similar abbreviations are used to denote intervals of time remote from the present. Symbol NIST SP811 and ISO 80000 - 3 : 2006 support the symbol a as the unit of time for a year. In English, the abbreviations y and yr are also used. The Unified Code for Units of Measure disambiguates the varying symbologies of ISO 1000, ISO 2955 and ANSI X3. 50 by using : a = 7002365242190000000 ♠ 365.242 19 days for the mean tropical year ; a = 365.25 days for the mean Julian year ; a = 7002365242500000000 ♠ 365.2425 days for the mean Gregorian year ; where : a, without a qualifier = 1 a ; and, ar for are, is a unit of area. The International Union of Pure and Applied Chemistry and the International Union of Geological Sciences have jointly recommended defining the annus, with symbol a, as the length of the tropical year in the year 2000 : a = 7007315569254450000 ♠ 31 556 925. 445 seconds ( approximately 7002365242192650000 ♠ 365.242 192 65 ephemeris days ) This differs from the above definition of 365.25 days by about 20 parts per million. The joint document says that definitions such as the Julian year `` bear an inherent, pre-programmed obsolescence because of the variability of Earth 's orbital movement '', but then proposes using the length of the tropical year as of 2000 AD ( specified down to the millisecond ), which of course suffers from the same problem. ( The tropical year oscillates with time by more than a minute. ) The notation has proved controversial as it conflicts with an earlier convention among geoscientists to use a specifically for years ago, and y or yr for a one - year time period. SI prefix multipliers For the following, there are alternative forms which elide the consecutive vowels, such as kilannus, megannus, etc. The exponents and exponential notations are typically used for calculating and in displaying calculations, and for conserving space, as in tables of data. ka ( for kiloannus ) -- a unit of time equal to one thousand, or 10, years, or 1 E3 yr, also known as a millennium in anthropology and calendar uses. The prefix multiplier `` ka '' is typically used in geology, paleontology, and archaeology for the Holocene and Pleistocene periods, where a non − radiocarbon dating technique : e.g. ice core dating, dendrochronology, uranium - thorium dating, or varve analysis ; is used as the primary dating method for age determination. If age is primarily determined by radiocarbon dating, then the age should be expressed in either radiocarbon or calendar ( calibrated ) years Before Present. Ma ( for megaannus ) -- a unit of time equal to one million, or 10, years, or 1 E6 yr. The suffix `` Ma '' is commonly used in scientific disciplines such as geology, paleontology, and celestial mechanics to signify very long time periods into the past or future. For example, the dinosaur species Tyrannosaurus rex was abundant approximately 66 Ma ( 66 million years ) ago. The duration term `` ago '' may not always be indicated : if the quantity of a duration is specified while not explicitly mentioning a duration term, one can assume that `` ago '' is implied ; the alternative unit `` mya '' does include `` ago '' explicitly. It also written as `` million years '' ( ago ) in works for general public use. In astronomical applications, the year used is the Julian year of precisely 365.25 days. In geology and paleontology, the year is not so precise and varies depending on the author. Ga ( for gigaannus ) -- a unit of time equal to 10 years, or 1 E9 yr, one billion years short scale ( one thousand million years long scale ). `` Ga '' is commonly used in scientific disciplines such as cosmology and geology to signify extremely long time periods in the past. For example, the formation of the Earth occurred approximately 4.54 Ga ( 4.54 billion years ) ago. Ta ( for teraannus ) -- a unit of time equal to 10 years, or 1 E12 yr, one trillion years short scale ( one billion years long scale ). `` Ta '' is an extremely long unit of time, about 70 times as long as the age of the universe. It is the same order of magnitude as the expected life span of a small red dwarf. Pa ( for petaannus ) -- a unit of time equal to 10 years, or 1 E15 yr, one quadrillion short scale ( one thousand billion long scale ). The half - life of the nuclide cadmium - 113 is about 8 Pa ``. This symbol coincides with that for the pascal without a multiplier prefix, though both are infrequently used and context will normally be sufficient to distinguish time from pressure values. Ea ( for exaannus ) -- a unit of time equal to 10 years, or 1 E18 yr, one quintillion years short scale ( one trillion years long scale ). The half - life of tungsten - 180 is 1.8 `` Ea ''. Abbreviations yr and ya Further information : Before Present In astronomy, geology, and paleontology, the abbreviation yr for years and ya for years ago are sometimes used, combined with prefixes for thousand, million, or billion. They are not SI units, using y to abbreviate English year, but following ambiguous international recommendations, use either the standard English first letters as prefixes ( t, m, and b ) or metric prefixes ( k, M, and G ) or variations on metric prefixes ( k, m, g ). These abbreviations include : Non-SI abbreviation SI - prefixed equivalent Order of magnitude kyr ka Thousand years Myr or myr Ma Million years byr Ga Billion years ( thousand million years ) kya or tya ka ago Appearance of Homo sapiens, circa 200 kya Out - of - Africa migration, circa 60 kya Last Glacial Maximum, circa 20 kya Neolithic Revolution, circa 10 kya Mya or mya Ma ago Pliocene, 5.3 to 2.6 mya The last geomagnetic reversal was 0.78 mya The ( Eemian Stage ) Ice Age started 0.13 mya The Holocene started 0.01 mya bya or gya Ga ago oldest Eukaryotes, 2 bya age of the Earth, 4.5 bya Big Bang, 13.8 bya Use of mya and bya is deprecated in modern geophysics, the recommended usage being Ma and Ga for dates Before Present, but `` m.y. '' for the duration of epochs. This ad hoc distinction between `` absolute '' time and time intervals is somewhat controversial amongst members of the Geological Society of America. Note that on graphs using ya units on the horizontal axis time flows from right to left, which may seem counter-intuitive. If the ya units are on the vertical axis, time flows from top to bottom which is probably easier to understand than conventional notation. See also Time portal Years portal 2017 : current year Astronomical year numbering Century Decade Millennium ISO 8601 : standard for representation of dates and times List of calendars List of years Epoch ( reference date ) Orders of magnitude ( time ) Unit of time References Notes Jump up ^ International Astronomical Union `` SI units '' accessed February 18, 2010. ( See Table 5 and section 5.15. ) Reprinted from George A. Wilkins & IAU Commission 5, `` The IAU Style Manual ( 1989 ) '' ( PDF file ) in IAU Transactions Vol. XXB Jump up ^ OED, s.v. `` year '', entry 2. b. : `` transf. Applied to a very long period or cycle ( in chronology or mythology, or vaguely in poetic use ). '' Jump up ^ Ziggelaar, A. ( 1983 ). `` The Papal Bull of 1582 Promulgating a Reform of the Calendar ''. In Coyne, Hoskin, Pedersen ( eds ), Gregorian Reform of the Calendar : Proceedings of the Vatican Conference to Commemorate its 400th Anniversary. Vatican City : Pontifical Academy of Sciences, Specolo Vaticano, p. 223 Jump up ^ Shields, Miriam Nancy. ( 1924 ). `` The New Calendar of the Eastern Churches, Popular Astronomy, Vol. 32, p. 407. Courtesy NASA Astrophysics Data System. Jump up ^ International Earth Rotation and Reference System Service. ( 2010 ). IERS EOP PC Useful constants. Jump up ^ Richards, E.G. ( 2013 ). Calendars. In S.E. Urban & P.K. Seidelmann ( Eds. ), Explanatory Supplement to the Astronomical Almanac ( 3rd ed. ). Mill Valley, CA : University Science Books. p. 586. Jump up ^ Astronomical Almanac for the Year 2011. Washington and Taunton : U.S. Government Printing Office and the U.K. Hydrographic Office. 2009. p. M18 ( Glossary ). Jump up ^ Astronomical Almanac for the Year 2011. Washington and Taunton : US Government Printing Office and the UK Hydrographic Office. 2009. pp. A1, C2. Jump up ^ Calendar Description and Coordination Maya World Studies Center Jump up ^ Astronomical Almanac for the Year 2010. Washington and Taunton : U.S. Government Printing Office and the U.K. Hydrographic Office. 2008. p. B3. Jump up ^ U.S. Naval Observatory Nautical Almanac Office and Her Majesty 's Nautical Almanac Office ( 2010 ). Astronomical Almanac for the year 2011. Washington : U.S. Government Printing Office. pp. C2, L8. Jump up ^ Simon, J.L. ; Bretagnon, P. ; Chapront, J. ; Chapront - Touzé, M. ; Francou, G. ; Laskar, J. ( February 1994 ). `` Numerical expressions for precession formulae and mean elements for the Moon and planets ''. Astronomy and Astrophysics. 282 ( 2 ) : 663 -- 683. Bibcode : 1994A&A... 282... 663S. Jump up ^ Taff, Lawrence G. ( 1985 ). Celestial Mechanics : A Computational Guide for the Practitioner. New York : John Wiley & Sons. p. 103. ISBN 0 - 471 - 89316 - 1. Values in tables agree closely for 2000, and depart by as much as 44 seconds for the years furthest in the past or future ; the expressions are simpler than those recommended in the Astronomical Almanac for the Year 2011. Jump up ^ Seidelmann, P. Kenneth ( 2013 ). Explanatory Supplement to the Astronomical Almanac. Sean E. Urban ( ed. ) ( 3 ed. ). Univ Science Books. p. 587. ISBN 1 - 891389 - 85 - 8. Tabulates length of tropical year from − 500 to 2000 at 500 year intervals using a formula by Laskar ( 1986 ) ; agrees closely with values in this section near 2000, departs by 6 seconds in − 500. Jump up ^ `` Science Bowl Questions, Astronomy, Set 2 '' ( PDF ). Science Bowl Practice Questions. Oak Ridge Associated Universities. 2009. Retrieved December 9, 2009. ^ Jump up to : Russ Rowlett. `` Units : A ''. How Many ? A Dictionary of Units of Measurement. University of North Carolina. Retrieved January 9, 2009. ^ Jump up to : `` AGU Editorial Style Guide for Authors ''. American Geophysical Union. September 21, 2007. Archived from the original on 2008 - 07 - 14. Retrieved 2009 - 01 - 09. ^ Jump up to : North American Commission on Stratigraphic Nomenclature ( November 2005 ). `` North American Stratigraphic Code ''. The American Association of Petroleum Geologists Bulletin ( Article 13 ( c ) ed. ). 89 ( 11 ) : 1547 -- 1591. doi : 10.1306 / 07050504129. Jump up ^ Ambler Thompson ; Barry N. Taylor ( 2008 ). `` Special Publication 811 -- Guide for the Use of the International System of Units ( SI ) '' ( PDF ). National Institute of Standards and Technology ( NIST ). para 8.1. Jump up ^ `` ISO 80000 - 3 : 2006, Quantities and units ''. Geneva : International Organization for Standardization. 2006. Part 3 : Space and time. Jump up ^ Gunther Schadow ; Clement J. McDonald. `` Unified Code for Units of Measure ''. Archived from the original on May 20, 2008. Jump up ^ http://aurora.regenstrief.org/~ucum/ucum.html#para-31 Jump up ^ Norman E. Holden ; Mauro L. Bonardi ; Paul De Bièvre ; Paul R. Renne & Igor M. Villa ( 2011 ). `` IUPAC - IUGS common definition and convention on the use of the year as a derived unit of time ( IUPAC Recommendations 2011 ) ''. Pure and Applied Chemistry. 83 ( 5 ) : 1159 -- 1162. doi : 10.1351 / PAC - REC - 09 - 01 - 22. ^ Jump up to : Celeste Biever ( April 27, 2011 ). `` Push to define year sparks time war ''. New Scientist. Retrieved April 28, 2011. Jump up ^ P. Belli ; et al. ( 2007 ). `` Investigation of β decay of Cd ''. Phys. Rev. C. 76 ( 6 ) : 064603. Bibcode : 2007PhRvC... 76f4603B. doi : 10.1103 / PhysRevC. 76.064603. Jump up ^ F.A. Danevich ; et al. ( 2003 ). `` α activity of natural tungsten isotopes ''. Phys. Rev. C. 67 : 014310. Bibcode : 2003PhRvC... 67a4310D. arXiv : nucl - ex / 0211013. doi : 10.1103 / PhysRevC. 67.014310. Jump up ^ North American Commission on Stratigraphic Nomenclature. `` North American Stratigraphic Code ( Article 13 ( c ) ) ''. ( c ) Convention and abbreviations. -- The age of a stratigraphic unit or the time of a geologic event, as commonly determined by numerical dating or by reference to a calibrated time - scale, may be expressed in years before the present. The unit of time is the modern year as presently recognized worldwide. Recommended ( but not mandatory ) abbreviations for such ages are SI ( International System of Units ) multipliers coupled with `` a '' for annus : ka, Ma, and Ga for kilo - annus ( 10 years ), Mega-annus ( 10 years ), and Giga - annus ( 10 years ), respectively. Use of these terms after the age value follows the convention established in the field of C - 14 dating. The `` present '' refers to AD 1950, and such qualifiers as `` ago '' or `` before the present '' are omitted after the value because measurement of the duration from the present to the past is implicit in the designation. In contrast, the duration of a remote interval of geologic time, as a number of years, should not be expressed by the same symbols. Abbreviations for numbers of years, without reference to the present, are informal ( e.g., y or yr for years ; my, m.y., or m. yr. for millions of years ; and so forth, as preference dictates ). For example, boundaries of the Late Cretaceous Epoch currently are calibrated at 63 Ma and 96 Ma, but the interval of time represented by this epoch is 33 m.y. Jump up ^ Bradford M. Clement ( April 8, 2004 ). `` Dependence of the duration of geomagnetic polarity reversals on site latitude ''. Nature. 428 ( 6983 ) : 637 -- 40. Bibcode : 2004Natur. 428... 637C. PMID 15071591. doi : 10.1038 / nature02459. Jump up ^ `` Time Units ''. Geological Society of America. Archived from the original on 2016 - 06 - 16. Retrieved February 17, 2010. Further reading Fraser, Julius Thomas ( 1987 ). Time, the Familiar Stranger ( illustrated ed. ). Amherst : University of Massachusetts Press. ISBN 0 - 87023 - 576 - 1. OCLC 15790499. Whitrow, Gerald James ( 2003 ). What is Time ?. Oxford : Oxford University Press. ISBN 0 - 19 - 860781 - 4. OCLC 265440481. External links Wikimedia Commons has media related to Years. 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9 Retrieved from `` https://en.wikipedia.org/w/index.php?title=Year&oldid=801310521 '' Categories : Years Orders of magnitude ( time ) Calendars Units of time Solar calendars Hidden categories : Wikipedia indefinitely move - protected pages Use mdy dates from October 2011 Articles containing Ancient Greek - language text Articles needing additional references from November 2014 All articles needing additional references All articles with unsourced statements Articles with unsourced statements from June 2010 Articles needing additional references from October 2012 Wikipedia articles needing clarification from March 2017 Wikipedia articles with GND identifiers Talk Contents About Wikipedia Afrikaans Alemannisch አማርኛ Ænglisc Аҧсшәа Aragonés ܐܪܡܝܐ Armãneashti অসমীয়া Asturianu Avañe'ẽ Авар Aymar aru Azərbaycanca تۆرکجه বাংলা Bân - lâm - gú Basa Banyumasan Башҡортса Беларуская Беларуская ( тарашкевіца ) ‎ भोजपुरी Български Boarisch བོད ་ ཡིག Bosanski Brezhoneg Буряад Català Чӑвашла Cebuano Čeština Chamoru ChiShona Cymraeg Dansk Deutsch Dolnoserbski Eesti Ελληνικά Emiliàn e rumagnòl Эрзянь Español Esperanto Euskara فارسی Fiji Hindi Føroyskt Français Frysk Furlan Gaeilge Gaelg Gàidhlig Galego 贛 語 ગુજરાતી 𐌲𐌿𐍄𐌹𐍃𐌺 客家 語 / Hak - 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Question: according to science how many days are in a year
Answer: 365.25 days