Copyright © Philip M. Parker, INSEAD. Terms of Use.
Definition: Time Scale |
Time ScaleNoun1. An arrangement of events used as a measure of duration; "on the geological time scale mankind has existed but for a brief moment". Source: WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. |
| Domain | Definitions |
Mining | See:geologic time scale. (references) |
Source: compiled by the editor from various references; see credits. | |
(From Wikipedia, the free Encyclopedia)
Historically, time standards were based on the Earth's rotational period. However, the rate at which the Earth rotates is not constant. Earth rotational standards were first replaced by ones based on the period of Earth's orbit but, because its orbit is elliptical, the Earth moves faster when it is closer to the sun, so the orbital period is not constant, either. Relatively recently, time interval standards based based on very accurate and stable atomic clocks have replace the previous standards base on the Earth's rotational and orbital speeds.
The internationally recognized time interval is the second. The second is used as the basic time interval for many time scales. Other intervals of time (minutes, hours, days, and years) are usually defined in terms of the second.
Solar time is based on the solar day, which is the period of time between one solar noon and the next. A solar day is approximately 24 hours, on average. However, because of the irregular rate of the Earth's rotation, solar time varies as much as 15 minutes from mean solar time.
Sidereal time is time by the stars. A sidereal day is the time it takes the Earth to make one revolution with respect to the stars. A sidereal day is approximately 23 hours 56 minutes 4 seconds.
Greenwich Mean Time (GMT) is time on the prime meridian. GMT used to be an international time standard. In that sense, technically, GMT no longer exists, although Universal Time is essentially what GMT used to be. Greenwich Mean Time also used to be the international standard for civil time. In that sense as well, GMT technically no longer exists, although GMT is still often used as a synonym for UTC, which is the international standard. The only sense in which Greenwich Mean Time technically still exists is as the name of a time zone.
International Atomic Time (TAI) is the primary international time standard from which other time standards, including UTC, are calculated. TAI is kept by the BIPM (International Bureau of Weights and Measures), and is based on the combined input of many atomic clocks around the world, each corrected for environmental and relativistic effects.
Universal Time (UT) is a time scale based the mean solar day, defined to be as uniform as possible despite variations in the rotation of the Earth.
Modified Julian day (MJD) is defined as MJD = JD - 2400000.5. An MJD day thus begins at midnight, civil date. Julian dates can be expressed in UT , TAI, TDT, etc. and so for precise applications the timescale should be specified, e.g. MJD 49135.3824 TAI.
See also: time, clock, calendar, era, epoch, period
For more information, see:
Some time standards
Time standards for planetary motion calculations
Ephemeris time, dynamical time and coordinate time are all intended to provide a uniform time for planetary motion calculations.
In 1991, in order to clarify the relationships between space-time coordinates, new time scales were introduced, each with a different frame of reference. Terrestrial Time is time at the surface of the Earth. Geocentric Coordinate Time is a proper time scale at the Earth's center. Barycentric Coordinate Time is a proper time scale at the center of gravity of the solar system, which is called the barycenter. Barycentric Dynamical Time is a dynamical time at the barycenter.
Other time scales
Julian day number is a count of days elapsed since Greenwich mean noon on 1 January 4713 B.C., Julian proleptic calendar. The Julian Date is the Julian day number followed by the fraction of the day elapsed since the preceding noon. Conveniently for astronomers, this avoids the date skip during an observation night.External links
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Time scale."
| Domain | Title |
Books | |
Source: compiled by the editor from various references; see credits. | |
Expressions using "time scale": extended time scale ♦ fast time scale ♦ slow time scale. Additional references. | |
| Source: compiled by the editor from various references; see credits. |
| The following statistics estimate the number of searches per day across the major English-language search engines as identified by various trade publications. Hyperlinks lead to commercial use of the expression at Amazon.com. |
| Expression | Frequency per Day |
geologic time scale | 65 |
time scale | 6 |
| Source: compiled by the editor from various references; see credits. | |
| Language | Translations for "time scale"; alternative meanings/domain in parentheses. | ||||||||||||||||
Danish | tidsskala i synkronisme (time scale in synchronism). (various references) | ||||||||||||||||
Dutch | tijdsschaal in synchronisme (time scale in synchronism). (various references) | ||||||||||||||||
Finnish | synkronoitu aikaskaala (time scale in synchronism). (various references) | ||||||||||||||||
French | échelle de temps en synchronisme (time scale in synchronism). (various references) | ||||||||||||||||
German | synchronisierte Zeitskala (time scale in synchronism). (various references) | ||||||||||||||||
Greek | κλίμακα χρόνου σε συγχρονισμό (time scale in synchronism). (various references) | ||||||||||||||||
Italian | scala dei tempi in sincronismo (time scale in synchronism). (various references) | ||||||||||||||||
Pig Latin | imetay alescay escala de tempo em sincronismo (time scale in synchronism). (various references) escala de tiempo en sincronismo (time scale in synchronism). (various references) | ||||||||||||||||
Scrabble® Enable2K-Verified Anagrams | |
Direct Anagrams: timescale. | |
| Words within the letters "a-c-e-e-i-l-m-s-t" | |
-1 letter: clematis, climates, mealiest, metalise, meticals. | |
-2 letters: calmest, camlets, celesta, climate, elastic, elmiest, emetics, laciest, latices, malices, mealies, metical, sectile, sematic. | |
-3 letters: amices, atelic, camels, camise, camlet, castle, claims, cleats, climes, eclats, elates, elects, elemis, elites, emails, emetic, lamest, listee, macles, mailes, malice, mastic, mealie, measle, mescal, mesial, metals, misact, misate, miseat, saltie, samiel. | |
| Words containing the letters "a-c-e-e-i-l-m-s-t" | |
+1 letter: centesimal, clematises, lemniscate, timescales. | |
+2 letters: colemanites, elastomeric, esemplastic, hemiacetals, lemniscates. | |
+3 letters: calorimeters, displacement, legitimacies, mantelpieces, misplacement, semimetallic. | |
+4 letters: calorimetries, ceremonialist, cleistogamies, credentialism, displacements, epistemically, misplacements, multivalences, telefacsimile. | |
+5 letters: acetazolamides, catecholamines, cephalometries, ceremonialists, cholestyramine, compatibleness, contemplatives, credentialisms, cumulativeness, exceptionalism, illegitimacies, incrementalism, incrementalist, interlacements, intermetallics, laryngectomies, methodicalness, petrochemicals, pinealectomies, reacclimatizes, reminiscential, semicentennial, stereochemical, telefacsimiles. | |
| Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. | |
Hexadecimal (or equivalents, 770AD-1900s) (references)54 69 6D 65 53 63 61 6C 65 |
| Leonardo da Vinci (1452-1519; backwards) (references)
|
Binary Code (1918-1938, probably earlier) (references)01010100 01101001 01101101 01100101 00100000 01010011 01100011 01100001 01101100 01100101 |
HTML Code (1990) (references)T i m e   S c a l e |
ISO 10646 (1991-1993) (references)0054 0069 006D 0065 0053 0063 0061 006C 0065 |
Encryption (beginner's substitution cypher): (references)5475797125369677871 |
| 1. Definition 2. Crosswords 3. Usage: Commercial 4. Images: Slideshow | 5. Expressions 6. Expressions: Internet 7. Translations: Modern 8. Anagrams | 9. Orthography 10. Bibliography |
Copyright © Philip M. Parker, INSEAD. Terms of Use.
| Note to the press & webmasters - this dictionary can be linked, indexed, or referred to using the following non-English expressions: woordeboek, fjalor, معجم, قاموس, diccionariu, речник, diccionari, diksyonario, diksinario, 字典, gérlyver, slovník, ordbog, woordenboek, shimiyuc p'anca, orðabók, orðbók, dictionnaire, wurdboek, wörterbuch, λεξικό, אוצר מילים, szótár, uqausiit tukingit, dizionario, 字引 , じい, じびき, じて", ディクショナリー , じり", じしょ, '"かい, ディクショナリ , 사 , dizionari, recnik, fockleyr, dikshonario, słownik, dicionário, dicţionar, dicziunari, словарь, lolomi fefiloi, foclair, abardair, faclair, briathrachan, pukuntau, leksikon, rečnik, vocabbulariu, diccionario, sí-chazamagâma, ordbok, lexikon, พจนานุกรม, sözlük, ansiklopedik sözlük, словник, довідник, có tính chất sách vở, geirlyfr, geiriadur, for dictionary; definisie, qartësi, përcaktim, saktësi, الوضوحية في الشيء, حد, تحديد, تعريف, التحديد, الإيضاحية, яснота, сила, очертания, дефиниция, 定義 , 定义, definice, deskriptordefinition, definitie, määritelmä, définition, ορισμός, "'"ר", "'בל", meghatározás, definíció, definizione, 確定 , ディーゼル電気車 , デ'ドロ酢酸 , デフィニション , ディフィニション , ていぎ, かくてい, 의, geyrid, meenaghey, keeayllaght, baght, definishon, definição, definiţie, determinare, definire, определение, definicija, definición, definition, açıklama, belirleme, belirtme, kesinleştirme, tanım, tarif, seçiklik, tanımlama, чіткість, тлумачення, виразність, визначення, дефініція, ясність, чітка чутність, sự định rõ, sự định nghĩa, lời định nghĩa sự định, diffiniad, darnodiad, for definition; vertaling, transferim, transmetim, ترجمة من لغة أجنبية للغة الأم, ترجمة, إفتتان, транслация, огъване, превод, предаване, поддаване, тълкуване, превеждане, 翻译, překlad, oversættelse, translatie, taajuusmuutos, translaatio, traduction, oersetting, Übersetzung, μετάφραση, תור'מ ות, תר'ום, "עתק", "עתק, fordítás, traduzione, 翻訳 , へい"ういどう, やくしょ, やくしゅつ, "うどく, ほ"やく, トランスレーション , やくじゅつ, ほ"やくしょ, 번역, tradukshon, tradução, translaţie, tãlmãcire, traducere, сдвиг, трансляция, перемещение, перевод, tumačenje, traducción, översättning, tercüme, процес перекладу, переклад, пояснення, переміщення, sự dịch, sự biến th nh sự giải thích, trosiad, for translation; Deens, danisht, danishte, لغة الدانمركية, نوع كعك, دانماركي, датски език, датски, Daniko, 丹麦语, dánský, dánština, danskur, danskt, tanskalainen, danois, Deensk, dänisch, δανικόσ, δανόσ, עו'ת שמרים, " י, dán, danska, Danmhairgis, danese, 덴마크, Danvargish, Danvargagh, danes, dinamarquês, danez, датский, danski, danski jezik, danés, dansk, danimarkalı, danimarka dili, датський, датська мова, tiếng Đan-mạch, for Danish; Nederlands, Hollands, holandez, هولندي, اللغة الهولندية, холандски, немски език, холандски език, холандците, немски, Olandes, 菏蘭語 , 荷兰语, holandský, nizozemský, hollandsk, hollendskt, hollantilainen, néerlandais, Nederlânsk, holländisch, ολλανδικόσ, ολλανδόσ, holandisht, "ול "י, holland, hollenskur, Ollainnis, olandese, 네덜란", Belanda, Ollanish, Germaanish, Tatimana, nederlandsk, ulandes, hulandes, holandês, neerlandés, olandez, nemţesc, limba olandezã, german, голландский, holanđanin, u škripcu, holandski, holandés, bakratongo, holländsk, ชาวเนเธอร์แลน"์, เกี่ยวกับเนเธอร์แลน"์, รรยา, alman, eş, flemenkçe, holandaca, hollanda, karı, hollandalı, hollandalılara özgü olan, Hollandali, hollanda'ya ait, голландська мова, голландський, ngôn ngữ khó hiểu, "b xã", for Dutch; Fins, finlandez, finlandishte, finlandisht, اللغة الفنلندية, فنلندية, فنلندي, фински език, фински, Pinlandino, 芬蘭語 , 芬兰语, finský, finskt, suomi, suomalainen, finnois, Finlandaise, finlandais, finnisch, φινλανδικόσ, פי י, finn, finnskur, finnska, finlandese, 핀란", Fynlannish, Fynlannagh, finlandês, finês, finlandezã, финский, Finisi, finski jezik, finski, finlandés, finés, finsk, fince, finlandiya'ya özgü, фінська мова, фінський, tiếng Phần-lan, for Finnish; Franse taal, Frans, franceze, francez, frëngjisht, frëng, frëngjishte, فرنسي, اللغة الفرنسية, الشعب الفرنسي, gall, френски език, френски, Pranses, 法國 , 法文 , 法語 , 法语, francouzština, francouzský, franskur, franskt, ranskalainen, français, Frânsk, französisch, γάλλοσ, γαλλικόσ, γαλλική γλώσσα, γαλλίδα, צרפתי, צרפתית, francia, Fraincis, francese, フレコン化 , フランス" , 仏文 , 仏 , ふつぶ", フレンチ , フランセ , ふつ, "랑스, Perancis, Ny Frangee, Mooinjey ny Frank, frances, franses, francês, francezii, francezã, franţuzesc, franţuzeşte, французский, Falani, francuski jezik, francuski, francuzi, francés, sí-Fulentji, fransk, franska, fransızca, Fransiz, fransızca ile ilgili, fransız, fransa ile ilgili, французька мова, французький, Ffrengig, isiFulentshi, for French; Duits, Duitser, Duitse taal, Germaan, gjerman, ضرب من الرقص, جرماني, المانية, الماني, اللغة الألمانية, роден, германски, немски език, немски, немец, готически, германец, 德語 , 德语, 德文 , 德國 , nìmecký, nìmec, tysker, Duitse, týskur, týskt, týskari, saksalainen, Allemand, Dútsk, Deutsche, Deutsch, "ερμανός, gjermanisht, 'רמ י, 'רמ ית, német, þjóðverji, þýskur, GearmÚnach, GearmÚinis, tedesco, ジプシー音楽 , ジャーマン , 독일, todesch, Germaanagh, Garmane, Germaanish, Carmane, aleman, Niemiec, niemiecki, alemão, alemand, neamţ, немецкий, Siamani, germanski, alemán, Tudesku, Doysri, mjeremani, mdachi, sí-Jalimáne, tysk, เยอรมัน, าษาเยอรมัน, Alman, німкеня, німецький, німець, $sisters german$ chị em ruột, $cousin german$ anh chị em con chú bác ruột, sister, Almaenwr, isiJalimane, iliJalimane, iJalimane, for German; Grieks, Griek, الإغريقي, يوناني, اللغة اليونانية, Griegu, гръцки език, гръцки, грък, Griyego, 希臘語 , 希腊语, řecký, řeètina, řek, græker, grikst, kreikkalainen, grec, Gryk, Gryksk, Gryks, grieche, ελληνικόσ, 'Ελληνας, יו ית, יו י, görög, Grikki, greco, ギリシア語 , ギリシア", 그리스, Greagish, Greagagh, grego, grèc, greacã, греческий, Eleni, grk, grčki jezik, grčki, griego, grek, Yunanli, yunanlı, yunanca, yunan, Rumca, yunanistan'a ait, rum, грек, гречанка, грецька мова, грецький, kẻ cắp b gi gặp nhau, quân bạc bịp tôi không thể hiểu được điều đó thật l kỳ phùng địch thủ, người Hy-lạp tiếng Hy-lạp kẻ bịp bợm, kẻ lừa đảo, Groegwr, for Greek; Italianer, Italiaans, Italiaan, شخص إيطالي, اللغة الإيطالية, الإيطالي, إيطالي, Italianu, италиански език, италиански, италианец, Italyano, 意大利 , 意大利語 , 意大利语, italština, italský, ital, italiener, italienskt, italialainen, Italien, Italjaansk, italienisch, Ιταλός, italisht, איטלקי, איטלקית, olasz, Ítali, IodÚilis, italiano, 이탈리아, Iddaalish, Włoch, italianã, italienesc, italieneşte, italian, итальянский язык, итальянский, итальянец, Italia, italijanski, italijanski jezik, italijan, sí-Taliyáne, italienare, italiensk, italienska, เกี่ยวกับอิตาลี, ชาวอิตาลี, าษาอิตาลี, italyanca, italyan, італі"ць, італійська мова, італійський, італійка, for Italian; Portugees, portugez, portugalisht, اللغة البرتغالية, البرتغالية, البرتغالي, португалски език, португалски, португалец, Potuges, 葡萄牙语, 葡萄牙人 , 葡萄牙語 , portugalský, portugiser, portugisiskt, portugalilainen, portugais, Portugeesk, portugiesisch, πορτογάλοσ, ορτογάλος, portugál, Portaingéilis, portoghese, ポルトガル語 , ポルトガル", 포르투갈, Portiugish, Portiugagh, portugues, Portugalczyk, português, portughez, португальский, portugalski jezik, portugalski, portugalac, portugués, Mreno, si-Putúkezi, portugis, portekiz, Portekízlí, portekizli, portekizce, португальська мова, португальський, португалець, người B"-đ o-nha tiếng B"-đ o-nha, for Portuguese; Spaans, Spaanse taal, spanjoll, اللغة الأسبانية, الأسبانية, أسباني, испански език, испански, espanyoles, Espanyol, 西班牙语, 西班牙文 , 西班牙語 , španìlský, španìlština, spanskt, espanjalainen, espagnol, Spaansk, spanisch, ισπανικά, ισπανικόσ, ισπανοί, karaiñe'êmegua, ספר"ית, ספר"י, spanyol, SpÚinnis, spagnolo, スペイン語 , スパイ罪 , スペイン", スパニッシュ , 스페인, Spaainagh, Spaainish, spañó, espanhol, espanhòl, spaniolesc, spanioleşte, spaniol, испанский, Sipaniolo, španski jezik, španski, español, spanska språk, spansk, ispanyollar, ispanyolca, ispanyol, іспанська мова, іспанський, for Spanish; 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