I … In both types, larger mirrors give a larger field of view, and thus make it easier to find a celestial object. “Sextant.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sextant. noun. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. In 1922, it was modified for aeronautical navigation by Portuguese navigator and naval officer Gago Coutinho. a measuring instrument for measuring the angular distance between celestial objects; resembles an octant; a … This is the case shown in the graphic alongside. sextant /ˈsɛkstənt/ n. an optical instrument used in navigation and consisting of a telescope through which a sighting of a heavenly body is taken, with protractors for determining its angular distance … Listen to the audio pronunciation in English. The instrument was to be used in conjunction with sextant and chart. It is necessary to flip back the horizon mirror shade to be able to see the horizon, and then the fine adjustment screw on the end of the index bar is turned until the bottom curve (the lower limb) of the sun just touches the horizon. late 16th cent. The measurement is thus limited by the angular accuracy of the instrument and not the sine error of the length of an alidade, as it is in a mariner's astrolabe or similar older instrument. 2.1. With noun/verb tables for the different cases and tenses links to audio pronunciation and … Origin. Delivered to your inbox! 'Nip it in the butt' or 'Nip it in the bud'. English to Konkani Dictionary: sextant. Learn the translation for ‘sextant’ in LEO’s English ⇔ German dictionary. After a 15-year interregnum, the U.S. Navy began training again in the sextant as back-up navigational devices as instructed by 30th Chief of Naval Operations (serving 2011-2015) inasmuch as it does not rely on electrical systems. Learn more. Since the measurement is relative to the horizon, the measuring pointer is a beam of light that reaches to the horizon. Informations sur sextant dans le dictionnaire gratuit en ligne anglais et encyclopédie. jw2019. sextant definition: 1. a device used on a ship or aircraft for measuring angles, such as those between stars or that…. New Latin sextant-, sextans sixth part of a circle, from Latin, sixth part, from sextus sixth. There are four errors that can be adjusted by the navigator, and they should be removed in the following order. It's a compass, charts and a sextant! opensubtitles2. : Un autre modèle de sextant utilisait un miroir pour refléter seulement l'horizon. For example, when a sextant is used on a moving ship, the image of both horizon and celestial object will move around in the field of view. A sextant in which a bubble contained in a fluid-filled tube, rather than the horizon, is used as a point of reference from which measurements of the angular distance between a … Most sextants also have filters for use when viewing the sun and reducing the effects of haze. A sextant is an instrument used to measure the angle between any two visible objects. Sextant See Sextans. Spoken pronunciation of sextant in English and in Kannada. Definition of sextant : an instrument for measuring angular distances used especially in navigation to observe altitudes of celestial bodies (as in ascertaining latitude and longitude) Learn more. [1] A sextant can also be used to measure the lunar distance between the moon and another celestial object (such as a star or planet) in order to determine Greenwich Mean Time and hence longitude. This article is about the Sextant as used for navigation.For the astronomer's sextant, see Sextant (astronomical). Others prefer to use a lit artificial horizon. (denoting the sixth part of a circle): from Latin sextans, sextant- ‘sixth part’, from sextus ‘sixth’. Attached to the frame are the "horizon mirror", an index arm which moves the index mirror, a sighting telescope, sun shades, a graduated scale and a micrometer drum gauge for accurate measurements. 2. Show English Meaning (+) Noun (1) a unit of angular distance equal to 60 degrees (2) a measuring instrument for measuring the angular distance between celestial objects; resembles an octant. For the astronomer's sextant, see, This article treats the doubly reflecting quadrant, not its predecessor described at, "Line of Position from a Horizontal Angle", https://navylive.dodlive.mil/2016/09/09/uss-benfold-sailors-look-to-past-to-chart-their-future/, The History of HM Nautical Almanac Office, Understand difference in Antique & Replica Sextant, Complete celnav theory book, including Lunars, https://en.wikipedia.org/w/index.php?title=Sextant&oldid=1015784798, Short description is different from Wikidata, Articles containing Portuguese-language text, Articles with unsourced statements from January 2015, Creative Commons Attribution-ShareAlike License, This page was last edited on 3 April 2021, at 15:06. sextant définition, signification, ce qu'est sextant: 1. a device used on a ship or aircraft for measuring angles, such as those between stars or that…. Word Origin. For solar observations, filters allow direct observation of the sun. [citation needed], Professional sextants use a click-stop degree measure and a worm adjustment that reads to a minute, 1/60 of a degree. sextant pronunciation. Forums pour discuter de sextant, voir ses formes composées, des exemples et poser vos questions. Ex : garçon - nm > On dira " le garçon" ou " un garçon". Early 20th century; earliest use found in Transactions Optical Society. In large part, this is because precision flat mirrors have grown less expensive to manufacture and to silver. Whole-horizon sextants use a half-silvered horizon mirror to provide a full view of the horizon. sextant Definitions. Some say they are more accurate because one's hand trembles less. COBUILD Advanced English Dictionary. However, one has to sweep the celestial object to ensure that the lowest limb of the celestial object touches the horizon. Definition of 'sextant'. n. A constellation in the equatorial region of the sky near Leo and Hydra. A highly skilled and experienced navigator can determine position to an accuracy of about 0.25-nautical-mile (460 m).[4]. A sextant is an instrument used for measuring angles, for example between the sun and the horizon, so that the position of a ship or aeroplane can be calculated . Un sextant est un instrument de navigation à réflexion servant à mesurer la distance angulaire entre deux points aussi bien verticalement que horizontalement. Définition de sextant dans le dictionnaire français en ligne. En savoir plus. With Reverso you can find the German translation, definition or synonym for Sextant and thousands of other words. ( Astronomie , Navigation ) Instrument permettant de relever la hauteur angulaire d’un astre au-dessus de l’ horizon et de déterminer par calcul la latitude et la longitude . sextant, instrument de marine qui sert à mesurer l'angle d'un astre au-dessus de l'horizon Dictionary source: Babylon English-French Dictionary More: English to French translation of sextant There are two types of horizon mirrors on the market today. The sextant is not dependent upon electricity (unlike many forms of modern navigation) or for that matter anything reliant on human-controlled signals (such as GPS satellites). Sextan definition: (of a fever ) marked by paroxysms that recur after an interval of five days | Meaning, pronunciation, translations and examples Log In Dictionary sextant - traduction français-anglais. They had no sextant, compass or charts. There are two common designs of artificial horizon. Translation for 'sextant' in the free English-Japanese dictionary and many other Japanese translations. The standard frame designs (see illustration) are supposed to equalise differential angular error from temperature changes. Since most sights are of the sun or moon, and haze is rare without overcast, the low-light advantages of the half-horizon mirror are rarely important in practice. Translations in context of "sextant" in English-German from Reverso Context: There was also a marble sextant, a triquetram and an armillary sphere. Used vertically, a measurement of the angle between the lantern of a lighthouse of known height and the sea level at its base can also be used for distance off.[5]. Aircraft sextants are now out of production, but had special features. This method is less likely to be successful for sighting stars and planets. The exact time of the sight must also be noted simultaneously, and the height of the eye above sea-level recorded. 2021. The filters usually consist of a series of progressively darker glasses that can be used singly or in combination to reduce haze and the sun's brightness. an optical instrument used in navigation and consisting of a telescope through which a sighting of a heavenly body is taken, with protractors for determining its angular distance above the horizon or from another heavenly body a sixth part of a circle having an arc … Definitions and Meaning of sextant in English sextant noun. Valider. A sextant does not require a completely steady aim, because it measures a relative angle. Quick definitions from WordNet (sextant) noun: a measuring instrument for measuring the angular distance between celestial objects; resembles an … (instrument de position) (navigation instrument) sextant n. noun: Refers to person, place, thing, quality, etc. Anglais. [5], An alternative method is to estimate the current altitude (angle) of the sun from navigation tables, then set the index bar to that angle on the arc, apply suitable shades only to the index mirror, and point the instrument directly at the horizon, sweeping it from side to side until a flash of the sun's rays are seen in the telescope. Avant le GPS, les marins utilisaient un sextant. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. "Swinging" the sextant about the axis of the telescope ensures that the reading is being taken with the instrument held vertically. Ein Sextant (Spiegelsextant; von lateinisch sextans ‚der sechste Teil‘) ist ein nautisches, optisches Messinstrument mit dem man den Winkel zwischen den Blickrichtungen zu relativ weit entfernten Objekten bestimmen kann, insbesondere den Winkelabstand eines Gestirns vom Horizont. The sextant began to replace these instruments in 18th century navigation. Sextants can be used very accurately to measure other visible angles, for example between one heavenly body and another and between landmarks ashore. Learn more in the Cambridge English-Chinese simplified Dictionary. For example, the sextant shown alongside has a scale graduated from −10° to 142°, so that is basically a quintant: the frame is a sector of a circle subtending an angle of 76° (not 72°) at the pivot of the index arm. NAmE / / ˈsɛkstənt / / jump to other results. sextant translate: （船舶或飞机精确定位用的）六分仪. Show Examples (+) (1) With only a sextant and a compass, they navigate for 16 days. However, sextants with adjustable polarizing filters have also been manufactured, where the degree of darkness is adjusted by twisting the frame of the filter. We use cookies to enhance your experience on our website, including to provide targeted advertising and track usage. 'All Intensive Purposes' or 'All Intents and Purposes'? sextant - traduction anglais-français. en.wiktionary.org (geometry) One sixth of a circle or disc; a sector with an angle of 60°. For the history and development of the sextant see Reflecting instruments. This allows excellent precision. The angle of the sight is then read from the scale on the arc, making use of the micrometer or vernier scale provided. See more. Le sextant a commencé à remplacer ces instruments au 18e siècle. noun historical . Sens du mot. Informations sur sextant dans le dictionnaire gratuit en ligne anglais et encyclopédie. Like the Davis quadrant, the sextant allows celestial objects to be measured relative to the horizon, rather than relative to the instrument. The principle of the instrument was first implemented around 1731 by John Hadley (1682–1744) and Thomas Godfrey (1704–1749), but it was also found later in the unpublished writings of Isaac Newton (1643–1727). The angle between the fixed ray and the object ray must therefore increase by 40°. Most had artificial horizons to permit taking a sight through a flush overhead window. Join us. The primary use of a sextant is to measure the angle between an astronomical object and the horizon for the purposes of celestial navigation. Example sentences with "sextant chart", translation memory . A sextant is a doubly reflecting navigation instrument that measures the angular distance between two visible objects. ! Meaning of air sextant in English: air sextant. The necessity for the doubled scale reading follows by consideration of the relations of the fixed ray (between the mirrors), the object ray (from the sighted object) and the direction of the normal perpendicular to the index mirror. [6], This article is about the sextant as used for navigation. Releasing the index bar (either by releasing a clamping screw, or on modern instruments, using the quick-release button), the image of the sun can be brought down to about the level of the horizon. noun. ‘The sextant goes with the nautical theme - she's trying to find where she's going, where she's been.’ ‘With only a sextant and a compass, they navigate for 16 days.’ ‘We fitted the trucks with air wheels - balloon tires, we would say now - and kept going, navigating like mariners, by sextant … Prononciation de sextant définition sextant traduction sextant signification sextant dictionnaire sextant quelle est la définition de sextant . Français. Word of the day. The angle, and the time when it was measured, can be used to calculate a position line on a nautical or aeronautical chart—for example, sighting the Sun at noon or Polaris at night (in the Northern Hemisphere) to estimate latitude.
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