Movatterモバイル変換

[0]ホーム

Jump to content

Fortnight

Edit links

From Wikipedia, the free encyclopedia

Time period of two weeks

This article is about the unit of time measurement. For the video game, seeFortnite. For other uses, seeFortnight (disambiguation).

Afortnight is a unit of time equal to 14days (twoweeks). The word derives from theOld English termfēowertīene niht, meaning "fourteennights" (or "fourteen days", since the Anglo-Saxons counted by nights).^[1]^[2]

Astronomy and tides

Further information:Eclipse cycle

Inastronomy, alunar fortnight is half alunar synodic month, which is equivalent to themean period between a full moon and a new moon (and vice versa). This is equal to 14.77 days.^[3]^[4]It gives rise to a lunar fortnightlytidal constituent (see:Long-period tides).

Analogs and translations

In many languages, there is no single word for a two-week period, and the equivalent terms "two weeks", "14 days", or "15 days" (counting inclusively) have to be used.

Celtic languages: inWelsh, the termpythefnos, meaning "15 nights", is used. This is in keeping with the Welsh term for a week, which iswythnos ("eight nights").^[5] InIrish, the term iscoicís.
Similarly, inGreek, the term δεκαπενθήμερο (dekapenthímero), meaning "15 days", is used.
TheHindu calendar uses theSanskrit word पक्ष "pakṣa", meaning one half of alunar month, which is between 14 and 15 solar days.
InRomance languages there are the termsquincena (orquince días) inGalician andSpanish,quinzena orquinze dies inCatalan andquinze dias orquinzena inPortuguese,quindicina^{[citation needed]} inItalian,quinze jours orquinzaine inFrench, andchenzină inRomanian, all meaning "a grouping of 15".
Semitic languages have a "doublingsuffix". When added at the end of the word for "week" it changes the meaning to "two weeks". InHebrew, the single-wordשבועיים (shvu′ayim) means exactly "two weeks". Also inArabic, by adding the commondual suffix to the word for "week",أسبوع, the formأسبوعين (usbu′ayn), meaning "two weeks", is formed.
Slavic languages: inCzech the termsčtrnáctidenní anddvoutýdenní have the same meaning as "fortnight".^[6] InUkrainian, the termдва тижні is used in relation to "biweekly, two weeks".

References

^"Fortnight".The Concise Oxford Dictionary (5th ed.). 1964. p. 480.
^Senight,sennight orse'night (seven-night), an old word for the week, was still in use in the early 19th century, to judge fromJane Austen's letters.
^Littmann, Mark; Fred Espenak; Ken Willcox (2008).Totality: Eclipses of the Sun.Oxford University Press.ISBN 978-0-19-953209-4.
^Weisstein, Eric W."Synodic Month definition".
^BBC (16 October 2014)."BBC Wales - Catchphrase".BBC Wales. Retrieved18 November 2016.Wythnos is a week.
^"Do You Know How to Say Fortnight in Different Languages?".www.indifferentlanguages.com.

v t e Time measurement andstandards
Chronometry Orders of magnitude Metrology
International standards	Coordinated Universal Time offset UT ΔT DUT1 International Earth Rotation and Reference Systems Service ISO 31-1 ISO 8601 International Atomic Time 12-hour clock 24-hour clock Barycentric Coordinate Time Barycentric Dynamical Time Civil time Daylight saving time Geocentric Coordinate Time International Date Line IERS Reference Meridian Leap second Solar time Terrestrial Time Time zone 180th meridian
Obsolete standards	Ephemeris time Greenwich Mean Time Prime meridian
Time in physics	Absolute space and time Spacetime Chronon Continuous signal Coordinate time Cosmological decade Discrete time and continuous time Proper time Theory of relativity Time dilation Gravitational time dilation Time domain Time-translation symmetry T-symmetry
Horology	Clock Astrarium Atomic clock Complication History of timekeeping devices Hourglass Marine chronometer Marine sandglass Radio clock Watch stopwatch Water clock Sundial Dialing scales Equation of time History of sundials Sundial markup schema
Calendar	Gregorian Hebrew Hindu Holocene Islamic (lunar Hijri) Julian Solar Hijri Astronomical Dominical letter Epact Equinox Intercalation Julian day Leap year Lunar Lunisolar Solar Solstice Tropical year Weekday determination Weekday names
Archaeology and geology	Chronological dating Geologic time scale International Commission on Stratigraphy
Astronomical chronology	Galactic year Nuclear timescale Precession Sidereal time
Otherunits of time	Instant Flick Shake Jiffy Second Minute Moment Hour Day Week Fortnight Month Year Olympiad Lustrum Decade Century Saeculum Millennium
Related topics	Chronology Duration music Mental chronometry Decimal time Metric time System time Time metrology Time value of money Timekeeper

Retrieved from "https://en.wikipedia.org/w/index.php?title=Fortnight&oldid=1320300262"

Category:

Units of time

Hidden categories:

[8]ページ先頭

Movatterモバイル変換

Astronomy and tides

Analogs and translations

See also

References