A year (from Old English gēr) is the time between two recurrences of an event related to the orbit of the Earth around the Sun. In Physics, an orbit is the gravitationally curved path of one object around a point or another body for example the gravitational orbit of a planet around a star EARTH was a short-lived Japanese vocal trio which released 6 singles and 1 album between 2000 and 2001 The Sun (Sol is the Star at the center of the Solar System. By extension, this can be applied to any planet: for example, a "Martian year" is the time in which Mars completes its own orbit. A planet, as defined by the International Astronomical Union (IAU is a celestial body Orbiting a Star or stellar remnant that is
West Saxon gear, Anglian gēr continues Proto-Germanic *jǣram (*jē2ram). Annum is one form of the Latin noun meaning Year, not a form normally used for derivatives in modern languages the accusative singular West Saxon redirects here For other meanings of Wessex or West Saxon see Wessex (disambiguation. Anglian is a cover term used to refer to two Dialects of Old English, namely the Northumbrian and Mercian dialects Proto-Germanic, or Common Germanic, is the hypothetical common ancestor ( Proto-language) of all the Germanic languages such as modern English Eiwaz or Eihaz (reconstructed *īhaz / *ēhaz or *īwaz / *ēwaz) was a Proto-Germanic word for " yew " Cognates are Old High German jar, Old Norse ár and Gothic jer, all from a PIE *yērom "year, season". Old Norse is the North Germanic language that was spoken by inhabitants of Scandinavia and inhabitants of their overseas settlements during the Viking Age Gothic is an extinct Germanic language that was spoken by the Goths. Cognates outside of Germanic are Avestan yare "year", Greek ὥρα "year, season, period of time" (whence "hour"), Old Church Slavonic jaru and Latin hornus "of this year". Avestan is an Eastern Old Iranian language that was used to compose the sacred hymns and canon of the Zoroastrian Avesta. The Ancient Greek language is the historical stage in the development of the Hellenic language family spanning the Archaic (c The hour (symbol h) is a unit of Time. It is not an SI unit but is accepted for use with the SI to make sure old Cyrillic letters are displayed properly (For example instead of just Ѣ write Ѣ Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome.
Latin annum is from a base *at-no-. Both *yē-ro- and *at-no- are based on verbal roots expressing movement, *at- and *ey- respectively, both meaning "to go" generally. Latin annum has a cognate in Gothic aþnam "year". The Greek word for "year", ἔτος, is cognate to Latin vetus "old", from PIE *wetus- "year" , also preserved in this meaning in Sanskrit vat-sa- "yearling (calf)". Sanskrit (sa संस्कृता वाक् saṃskṛtā vāk, for short sa संस्कृतम् saṃskṛtam) is a historical
A calendar year is the time between two dates with the same name in a calendar. According to the Gregorian calendar, the calendar year begins on January 1 and ends on December 31. The word Calendar consist of two words 1 Cal ( in Pashto means Year in Hindi and Persian is Sal- also means Year
The Gregorian calendar attempts to keep the vernal equinox on or close to March 21; hence it follows the vernal equinox year. The Gregorian calendar is the most widely used Calendar in the world today An equinox is the event of the Sun passing over the Earth's equator in its annual cycle Events 630 - Byzantine emperor Heraclius restores the True Cross to Jerusalem. A tropical year (also known as a solar 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 The average length of this calendar's year is 365. 2425 days (which can be thought of as 97 out of 400 years being leap years) whereas the vernal equinox year is 365. 2424 days.
Among solar calendars in wide use today, the Persian calendar is one of the most precise. The Iranian calendar or Solar Hejri (تقویم هجری شمسی؛ سالنمای هجری خورشیدی Taqwim Hejri Shamsi Salanmay Hejri Khurshidi) is an astronomical Rather than being based on numerical rules, the Persian year begins on the day (for the time zone of Tehran) on which the vernal equinox actually falls, as determined by precise astronomical computations. Tehran (or Teheran) ( Persian: تهران Tehrān) is the capital and largest City of Iran, and the administrative center of
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. Intercalation is the insertion of a leap day week or month into some calendar years to make the calendar follow the seasons or moon phases A leap year (or intercalary year) is a year containing one or more extra days (or in the case of Lunisolar calendars an extra month in order to keep the
In the Julian calendar, the average length of a year was 365. The Julian calendar, a reform of the Roman calendar, was introduced by Julius Caesar in 46 BC and came into force in 45 BC (709 Ab urbe condita 25 days. (This is still used as a convenient time unit in astronomy as shown below. ) In a non-leap year, there are 365 days, in a leap year there are 366 days. A leap year occurs every 4 years.
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. The 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 or the flowering of a species A season is one of the major divisions of the Year, generally based on yearly periodic changes in Weather. All of these events can have wide variations of more than a month from year to year. The month is a unit of Time, used with Calendars which is approximately as long as some natural period related to the motion of the Moon;
A fiscal year is a 12-month period used for calculating annual financial statements in businesses and other organizations. A fiscal year (or financial year, or sometimes budget year) is a period used for calculating annual ("yearly" Financial statements in Businesses 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, the federal government of the U. S. has a fiscal year that starts on October 1st instead of January 1st. In Australia the financial year runs from July 1st. For a topic outline on this subject see List of basic Australia topics. In Canada, from April 1st. Country to "Dominion of Canada" or "Canadian Federation" or anything else please read the Talk Page
An academic year refers to the annual period during which a student attends school, college or university. An academic term is a division of an academic year the time during which a School, College or University holds classes
The school year can be divided up in various ways, two of which are most common in North American educational systems.
The Julian year, as used in astronomy and other sciences, is a time unit defined as exactly 365. In Astronomy, a Julian year (symbol a) is a unit of measurement of Time defined 25 days. This is the normal meaning of the unit "year" (symbol "a" from the Latin annus, annata) used in various scientific contexts. Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome. The Julian century of 36,525 days and the Julian millennium of 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. A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by
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). The sidereal year is the time taken for the Sun to return to the same position with respect to the Stars of the Celestial sphere. Its duration in SI days of 86,400 SI seconds each is on average:
The tropical year is the time taken for the Earth to complete one revolution with respect to the framework provided by the intersection of the ecliptic (the plane of the orbit of the Earth) and the plane of the equator (the plane perpendicular to the rotation axis of the Earth). A tropical year (also known as a solar 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 The ecliptic is the apparent path that the Sun traces out in the sky during the year The equator (sometimes referred to colloquially as "the Line") is the intersection of the Earth 's surface with the plane perpendicular to the The exact length of a tropical year slightly depends on the chosen starting point: for example the vernal equinox year is the time between successive vernal equinoxes. The mean tropical year (averaged over all ecliptic points) is:
The tropical year is shorter than the sidereal year because of the precession of the equinoxes. In Astronomy, Precession refers to the movement of the rotational axis of a body such as a planet with respect to Inertial space.
The anomalistic year is the time taken for the Earth to complete one revolution with respect to its apsides. In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from 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 2008), and the aphelion, where the Earth is farthest from the Sun (July 4 in 2008). In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from Events 1431 - Joan of Arc is handed over to the Bishop Pierre Cauchon. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from Events 836 - Pactum Sicardi, peace between the Principality of Benevento and the Duchy of Naples The anomalistic year is usually defined as the time between two successive perihelion passages. Its average duration is:
The anomalistic year is slightly longer than the sidereal year because of the precession of the apsides (or anomalistic precession). In Astronomy, Precession refers to the movement of the rotational axis of a body such as a planet with respect to Inertial space.
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 lunar nodes are the Orbital nodes of the Moon, that is the points where the orbit of the Moon crosses the Ecliptic (which is the apparent This period 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. An eclipse is an astronomical event that occurs when one Celestial object moves into the shadow of another Hence there are two eclipse seasons every eclipse year. The average duration of the eclipse year is:
This term is sometimes erroneously used to designate the draconic or nodal period of lunar precession, that is the time it takes for a complete revolution of the Moon's ascending node around the ecliptic: 18. There are two important Precessional motions in the Orbit of the Moon. 612 815 932 Julian years (6798. 331 019 days; at the epoch J2000. 0).
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. The full moon cycle is a cycle of about 14 Lunations over which Full moons vary in apparent size and age (time since New moon) This period is associated with the apparent size of the full moon, and also with the varying duration of the synodic month. Full moon is a Lunar phase that occurs when the Moon is on the opposite side of the Earth from the Sun. The month is a unit of Time, used with Calendars which is approximately as long as some natural period related to the motion of the Moon; The duration of one full moon cycle is:
The lunar year comprises twelve full cycles of the phases of the Moon, as seen from Earth. A lunar calendar is a Calendar that is based on cycles of the Moon phase. It has a duration of approximately 354. 37 days.
A heliacal year is the interval between the heliacal risings of a star. The heliacal rising of a Star (or other body such as the Moon, a Planet or a Constellation) occurs when it first becomes visible above the eastern It differs from the sidereal year for stars away from the ecliptic due mainly to the precession of the equinoxes (To visualise: the constellation Crux which rose and set as seen from the Mediterranean in ancient Greek times, is never above the horizon in current times. The sidereal year is the time taken for the Sun to return to the same position with respect to the Stars of the Celestial sphere. The ecliptic is the apparent path that the Sun traces out in the sky during the year In Astronomy, Precession refers to the movement of the rotational axis of a body such as a planet with respect to Inertial space. CRUX is a lightweight I686 -optimized Linux distribution targeted at experienced Linux users The Ancient Greek language is the historical stage in the development of the Hellenic language family spanning the Archaic (c )
The Sothic year is the interval between heliacal risings of the star Sirius. The Sothic cycle or Canicular period is a period of 1461 Ancient Egyptian years (of 365 days each or 1460 Julian years (averaging 365 Its duration is very close to the mean Julian year of 365. 25 days.
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. A Gaussian year is defined as 3652568983 Days It was adopted by Carl Friedrich Gauss as the length of the Sidereal year in his studies of the dynamics Carl Friedrich Gauss expressed the Gravitational constant in units of the Solar system rather than SI units Such a planet would be slightly closer to the Sun than Earth's mean distance. Its length is:
The Besselian year is a tropical year that starts when the fictitious mean Sun reaches an ecliptic longitude of 280°. In Astronomy, an epoch is a moment in time used as a reference for the Orbital elements of a Celestial body. This is currently on or close to 1 January. It is named after the 19th century German astronomer and mathematician Friedrich Bessel. The 19th century of the Common Era began on January 1, 1801 and ended on December 31, 1900, according to the Gregorian calendar Friedrich Wilhelm Bessel (22 July 1784 &ndash 17 March 1846 was a German Mathematician, Astronomer, and systematizer of the Bessel functions An approximate formula to compute the current time in Besselian years from the Julian day is:
The Great year, Platonic year, or Equinoctial cycle corresponds to a complete revolution of the equinoxes around the ecliptic. A Great year (also known as a Platonic year or Equinoctial cycle) is the time required for one complete cycle of the Precession of the equinoxes, Its length is about 25,700 years, and cannot be determined precisely as the precession speed is variable.
The Galactic year is the time it takes Earth's solar system to revolve once around the galactic center. The galactic year, also known as a cosmic year, is the duration of time required for the Solar system to Orbit once around the center of the Milky The Solar System consists of the Sun and those celestial objects bound to it by Gravity. The Galactic Center is the rotational center of the Milky Way Galaxy. It comprises roughly 226 million Earth years.
The exact length of an astronomical year changes over time. The main sources of this change are:
An average Gregorian year is 365. 2425 days = 52. A day (symbol d is a unit of Time equivalent to 24 Hours and the duration of a single Rotation of planet Earth with respect to the 1775 weeks, 8,765. A week (also called sennight or sevennight) is a unit of Time longer than a Day and shorter than a Month. 82 hours = 525,949. The hour (symbol h) is a unit of Time. It is not an SI unit but is accepted for use with the SI 2 minutes = 31,556,952 seconds (mean solar, not SI). A minute is a Unit of measurement of Time or of Angle. The minute is a unit of Time equal to 1/60th of an Hour or 60 The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units
A common year is 365 days = 8,760 hours = 525,600 minutes = 31,536,000 seconds.
A leap year is 366 days = 8,784 hours = 527,040 minutes = 31,622,400 seconds.
The 400-year cycle of the Gregorian calendar has 146,097 days and hence exactly 20,871 weeks.
See also numerical facts about the Gregorian calendar. The Gregorian calendar is the most widely used Calendar in the world today
A calendar era is used to assign a number to individual years, using a reference point in the past as the beginning of the era. A calendar era is the year numbering system used by a Calendar. In many countries, the most common era is from the estimated date of the birth of Jesus Christ; dates in this era are designated anno Domini ("in the year of the Lord", abbreviated A. Jesus of Nazareth (7–2 BC / BCE —26–36 AD / CE) D. ) or, more neutrally, C. E. (common era). Other eras are also used to enumerate the years in different cultural, religious or scientific contexts.