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Annum is one form of the Latin
Latin

Latin is an Italic language, historically spoken in Latium and Ancient Rome. Through the Military history of the Roman Empire, Latin spread throughout the Mediterranean and a large part of Europe....
 noun meaning year
Year

A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. By extension, this can be applied to any planet: for example, a "Martian year" is the time in which Mars completes its own orbit....
, not a form normally used for derivatives in modern languages: the accusative
Accusative case

The accusative case of a noun is the grammatical case used to mark the direct object of a transitive verb. The same case is used in many languages for the objects of prepositions....
 singular
Grammatical number

In linguistics, grammatical number is a grammatical category of nouns, pronouns, and adjective and verb agreement that expresses count distinctions ....
 of the second declension
Declension

In linguistics, declension is the occurrence of inflection in nouns, pronouns and adjectives, indicating such features as grammatical number , grammatical case , and grammatical gender....
 masculine
Grammatical gender

In linguistics, grammatical genders, sometimes also called noun classes, are classes of nouns reflected in the behavior of associated words; every noun must belong to one of the classes and there should be very few which belong to several classes at once....
 noun
Noun

In linguistics, a noun is a member of a large, open class lexical category whose members can occur as the main word in the subject of a clause, the object of a verb, or the object of a preposition....
 annus (nominative), anni (genitive singular and nominative plural).

As a unit of time, it is defined as exactly 365.25 days (that is, the average length of a year in the Julian calendar
Julian calendar

The Julian calendar, a reform of the Roman calendar, was introduced by Julius Caesar in 46 BC, and came into force in 45 BC . It was chosen after consultation with the astronomer Sosigenes of Alexandria and was probably designed to approximate the tropical year, known at least since Hipparchus....
) of 86,400 SI
Si

Si, si, or SI may refer to :...
 seconds each, representing the duration of one revolution of the Earth around the Sun.






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Annum is one form of the Latin
Latin

Latin is an Italic language, historically spoken in Latium and Ancient Rome. Through the Military history of the Roman Empire, Latin spread throughout the Mediterranean and a large part of Europe....
 noun meaning year
Year

A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. By extension, this can be applied to any planet: for example, a "Martian year" is the time in which Mars completes its own orbit....
, not a form normally used for derivatives in modern languages: the accusative
Accusative case

The accusative case of a noun is the grammatical case used to mark the direct object of a transitive verb. The same case is used in many languages for the objects of prepositions....
 singular
Grammatical number

In linguistics, grammatical number is a grammatical category of nouns, pronouns, and adjective and verb agreement that expresses count distinctions ....
 of the second declension
Declension

In linguistics, declension is the occurrence of inflection in nouns, pronouns and adjectives, indicating such features as grammatical number , grammatical case , and grammatical gender....
 masculine
Grammatical gender

In linguistics, grammatical genders, sometimes also called noun classes, are classes of nouns reflected in the behavior of associated words; every noun must belong to one of the classes and there should be very few which belong to several classes at once....
 noun
Noun

In linguistics, a noun is a member of a large, open class lexical category whose members can occur as the main word in the subject of a clause, the object of a verb, or the object of a preposition....
 annus (nominative), anni (genitive singular and nominative plural).

As a unit of time, it is defined as exactly 365.25 days (that is, the average length of a year in the Julian calendar
Julian calendar

The Julian calendar, a reform of the Roman calendar, was introduced by Julius Caesar in 46 BC, and came into force in 45 BC . It was chosen after consultation with the astronomer Sosigenes of Alexandria and was probably designed to approximate the tropical year, known at least since Hipparchus....
) of 86,400 SI
Si

Si, si, or SI may refer to :...
 seconds each, representing the duration of one revolution of the Earth around the Sun. Although there is no universally accepted symbol for the year, NIST SP811 and ISO 80000-3:2006 suggest the symbol a (in the International System of Units
International System of Units

The International System of Units is the modern form of the metric system and is generally a system devised around the convenience of the number ten....
 a is also the symbol for the are
Are

Are is a unit of area, equal to 100 square metres , used for measuring land area. It was defined by older forms of the metric system, but is now outside of the modern SI ....
 unit of area, but context is usually enough to disambiguate). In English, the abbreviation yr is still used informally but is deprecated in scientific usage.

The Unified Code for Units of Measure
Unified Code for Units of Measure

The Unified Code for Units of Measure is a system of codes for unambiguously representing measurement units to both humans and machines.The code set includes all units defined in ISO 1000, ISO 2955-1983, ANSI X3.50-1986, HL7 and ENV 12435, but explicitly and verifiably addresses the naming conflicts and ambiguities in those standards t...
 disambiguates the varying symbologies of ISO 1000, ISO 2955 and ANSI X3.50 by using

ar for are (unit)
Are

Are is a unit of area, equal to 100 square metres , used for measuring land area. It was defined by older forms of the metric system, but is now outside of the modern SI ....
, and:


at = a_t = 365.24219 d
D

D is the fourth letter in the Latin alphabet. Its name in English language is spelled dee , plural dees....
ays for the mean tropical year
Tropical year

A tropical year is the length of time that the Sun takes to return to the same position in the cycle of seasons, as seen from Earth; for example, the time from vernal equinox to vernal equinox, or from summer solstice to summer solstice....


aj = a_j = 365.25 d
D

D is the fourth letter in the Latin alphabet. Its name in English language is spelled dee , plural dees....
ays for the mean Julian year
Julian year

A Julian year can refer to* The Julian year is a time interval of exactly 365.25 days, used in astronomy.* The Julian year is a year in the Julian calendar which has started on different days, at different times, in different countries and is equal to either 365 or 366 days, or 365.25 days on average....


ag = a_g = 365.2425 d
D

D is the fourth letter in the Latin alphabet. Its name in English language is spelled dee , plural dees....
ays for the mean Gregorian year


a = 1 aj year (without further qualifier)


Multiples of an "annum"

  • per annum means "yearly".
  • kiloannum, usual symbol ka, is a unit of time equal to
    Millennium

    A millennium is a period of time equal to one thousand years . The term may implicitly refer to calendar millenniums; periods tied numerically to a particular calendar, specifically ones that begin at the starting point of the calendar in question or in later years which are whole number multiples of a thousand years after it....
     one thousand years.
  • megaannum, usual symbol Ma, is a unit of time
    Time

    Time is a component of the measurement used to sequence events, to compare the durations of events and the intervals between them, and to quantify the motions of objects....
     equal to one million
    Million

    One million , or one thousand 1000 , is the natural number following 999,999 and preceding 1,000,001. The name is derived from Italian, where mille was 1,000, and 1,000,000 became milione, "a large thousand"....
     (106) years. It is commonly used in scientific disciplines such as geology
    Geology

    Geology is the science and study of the solid and liquid matter that constitute the Earth. The field of geology encompasses the study of the composition, structural geology, physical properties, dynamics, and History of the Earth of Earth materials, and the processes by which they are formed, moved, and changed....
    , paleontology
    Paleontology

    File:Geological time spiral - sharper.pngPaleontology from Greek: pa?a??? "old, ancient", ??, ??t- "being, creature", and ????? "speech, thought" is the study of prehistory life, including organisms' evolution and interactions with each other and their environments ....
    , and celestial mechanics
    Celestial mechanics

    Celestial mechanics is the branch of astronomy that deals with the motion s of celestial objects. The field applies principles of physics, historically classical mechanics, to astronomical objects such as stars and planets to produce ephemeris data....
     to signify very long time periods in the past. For example, the dinosaur
    Dinosaur

    Dinosaurs were the dominant vertebrate animals of Landform ecosystems for over 160 million years, from the late Triassic Period until the end of the Cretaceous Period , when most of them became extinct in the Cretaceous?Tertiary extinction event....
     species Tyrannosaurus rex
    Tyrannosaurus

    Tyrannosaurus is a genus of theropod dinosaur. The famous species Tyrannosaurus rex , commonly abbreviated to T. rex, is a fixture in popular culture around the world....
     was abundant approximately 65 Ma (65 million years) ago (ago may not always be mentioned; if the quantity is specified while not explicitly discussing a duration, one can assume that "ago" is implied; the alternative but deprecated "mya
    Mya (unit)

    In astronomy, geology, and paleontology, mya or "m.y.a." is an abbreviation for "million years ago". Like the related unit bya, mya is traditionally written in lower case....
    " unit includes "ago" explicitly.). In astronomical applications, the year used is the Julian year
    Julian year (astronomy)

    In astronomy, a Julian year is a Units of measurement of time defined as exactly 365.25 days of 86,400 International System of Units seconds each, totalling 31,557,600 seconds....
     of precisely 365.25 days.
  • gigaannum, usual symbol Ga, is a unit of time equal to 109 years (one billion
    1000000000 (number)

    1,000,000,000 is the natural number following 999,999,999 and preceding 1,000,000,001.In scientific notation, it is written as 109....
     on the short scale
    Long and short scales

    The long and short scales are two different numerical systems used throughout the world:Note that the difference between the two scales grows as numbers get larger....
    , one milliard
    Milliard

    Milliard is a French language-derived numeral word meaning the number 1000000000 and which is used in France, Germany, the Scandinavian countries or the Netherlands....
     on the long scale
    Long and short scales

    The long and short scales are two different numerical systems used throughout the world:Note that the difference between the two scales grows as numbers get larger....
    ). It is commonly used in scientific disciplines such as cosmology
    Physical cosmology

    Physical cosmology, as a branch of astronomy, is the study of the largest-scale structures and dynamics of our universe and is concerned with fundamental questions about its formation and evolution....
     and geology
    Geology

    Geology is the science and study of the solid and liquid matter that constitute the Earth. The field of geology encompasses the study of the composition, structural geology, physical properties, dynamics, and History of the Earth of Earth materials, and the processes by which they are formed, moved, and changed....
     to signify extremely long time periods in the past. For example, the formation of the Earth
    Earth

    Earth is the third planet from the Sun. Earth is the largest of the terrestrial planets in the Solar System in diameter, mass and density. It is also referred to as the World and Wiktionary:Terra.Note that by International Astronomical Union convention, the term "Terra" is used for naming extensive land masses, rather...
     occurred approximately 4.57 Ga (4.57 billion years) ago.
  • teraannum, symbol Ta, is a unit of time equal to 1012 years (one trillion on the short scale, one billion on the long scale). It is an extremely long unit of time, about 70 times as long as the age of the universe
    Age of the universe

    The age of the universe is the time elapsed between the Big Bang and the present day. Current theory and observations suggest that this is between 13.61 and 13.85 1000000000 years....
    . The expected life span of a small red dwarf star.
  • petaannum, symbol Pa, is a unit of time equal to 1015 years (one quadrillion
    Orders of magnitude (numbers)

    This list compares various sizes of positive numbers, including counts of things, dimensionless quantity and probability. Each number is given a name in the so called Long and short scales which is used in English speaking countries, as well as a name in the Long and short scales which is used in a series of countries that do not have English as th...
     on the short scale, one billiard on the long scale). The half-life of the nuclear isomer tantalum
    Tantalum

    Tantalum is a chemical element with the symbol Ta and atomic number 73. A rare, hard, blue-grey, lustre transition metal, tantalum is highly corrosion-resistant and occurs naturally in the mineral tantalite, always together with the chemically similar niobium....
    -180m is about 1 Pa.
  • exaannum, usual symbol Ea, is a unit of time equal to 1018 years (one quintillion on the short scale, one trillion on the long scale). The half-life of tungsten
    Tungsten

    Tungsten , also known as wolfram , is a chemical element that has the symbol W and atomic number 74.A steel-gray metal, tungsten is found in several ores, including wolframite and scheelite....
    -180 is 1.8 Ea.


Deprecated unit symbols

  • bya - Formerly used for Ga (ago)
  • byr - Formerly used for Ga (either elapsed or ago)
  • mya
    Mya (unit)

    In astronomy, geology, and paleontology, mya or "m.y.a." is an abbreviation for "million years ago". Like the related unit bya, mya is traditionally written in lower case....
     - Formerly used for Ma (ago)
  • myr - Formerly used for Ma (either elapsed or ago)
  • tya
    Tya

    In astronomy, geology, and paleontology, tya, sometimes also kya, is an acronym for thousand years ago and is used as a unit of time to denote length of time before the present....
     (sometimes spelled kya) - formerly used for ka (ago)
  • kyr - Formerly used for ka (either elapsed or ago)
These unit symbols are now deprecated in modern geophysics. Except for kyr they do not use accepted SI prefix
SI prefix

An SI prefix is a name or associated symbol that precedes a basic unit of measure to form a decimal multiple . The abbreviation SI is from the French language name Syst?me International d?Unit?s ....
es. Further, the suffixes ya and yr are not accepted SI units for time. However ya would be the symbol for the yoctoannum unit of time. 1 ya would be 10-24 a which would be about of 3.15 x 10-17 s.

See also

  • Before Present
    Before Present

    Before Present years are a time scale used in archaeology, geology, and other science disciplines to specify when events in the past occurred. Because the "present" time changes, standard practice is to use 1950 Common_Era as the arbitrary origin of the age scale....
  • Orders of magnitude (time)
    Orders of magnitude (time)

    Seconds...