Sextant definition

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The intersection of that circle with a dead-reckoning track, or another sighting, gives a more precise location. All of these instruments may be termed "sextants". Solid brass frame sextants are less susceptible to wobbling in high winds or when the vessel is working in heavy seas, but as noted are substantially heavier. Most sextants also include a vernier on the worm dial that reads to 0. Both smaller and larger instruments are or were in use: However, sextants with adjustable polarizing filters have also been manufactured, where the degree of darkness is adjusted by twisting the frame of the filter. For solar observations, filters allow direct observation of the sun. This article is about the sextant as used for navigation. Since the measurement is relative to the horizon, the measuring pointer is a beam of light that reaches to the horizon. Aircraft sextants are now out of production, but had special features.

  • sextant Wiktionary
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    Sextant definition is - an instrument for measuring angular distances used especially in navigation to observe altitudes of celestial bodies (as in ascertaining. A sextant is a doubly reflecting navigation instrument that measures the angular distance between two visible objects.

    The primary use of a sextant is to measure. an astronomical instrument used to determine latitude and longitude at sea by measuring angular distances, especially the altitudes of sun, moon, and stars. Now read the angle of the height of that light by using your sextant. instrument for determining latitude, s, from.
    Many users prefer a simple sighting tube, which has a wider, brighter field of view and is easier to use at night.

    This makes it easy to see when the bottom limb of a celestial object touches the horizon. At sea, results within several nautical miles, well within visual range, are acceptable.

    A sight or measure of the angle between the suna staror a planetand the horizon is done with the 'star telescope ' fitted to the sextant using a visible horizon.

    sextant Wiktionary

    With these, the navigator pre-computed his sight and then noted the difference in observed versus predicted height of the body to determine his position.

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    For a sun sight, a filter is used to overcome the glare such as "shades" covering both index mirror and the horizon mirror designed to prevent eye damage.

    The standard frame designs see illustration are supposed to equalise differential angular error from temperature changes. By setting the index bar to zero, the sun can be viewed through the telescope.

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    The simplest sight reduction is to draw the equal-altitude circle of the sighted celestial object on a globe.

    This is superior at night and in haze, when the horizon can be difficult to see.

    Due to the sensitivity of the instrument it is easy to knock the mirrors out of adjustment.

    A sextant is a tool for measuring the angles between heavenly bodies — the kind found in outer space. Used as a navigational tool out at sea, it helps determine.

    images sextant definition

    sextant definition: a device used on a ship or aircraft for measuring angles, such as those between stars or that between the sun and the earth, in order to. Sextant definition: A sextant is an instrument used for measuring angles, for example between the sun and the | Meaning, pronunciation, translations and.
    Many users prefer a simple sighting tube, which has a wider, brighter field of view and is easier to use at night.

    High-precision sextants have an invar a special low-expansion steel frame and arc. By using this site, you agree to the Terms of Use and Privacy Policy. For other uses, see Sextant disambiguation.

    Sextant Define Sextant at

    This is the case shown in the graphic alongside. The measurement is thus limited by the angular accuracy of the instrument and not the sine error of the length of an alidadeas it is in a mariner's astrolabe or similar older instrument. Forsythe made a notation from the sextant on a piece of paper.

    images sextant definition
    Sextant definition
    Historical Examples of sextant Dontor glanced at the juniors, saw that Kuero had his sextant ready, and raised his own.

    The scale must be graduated so that the marked degree divisions register twice the angle through which the index arm turns.

    images sextant definition

    The simplest sight reduction is to draw the equal-altitude circle of the sighted celestial object on a globe. Attached to the frame are the "horizon mirror", an index arm which moves the index mirrora sighting telescope, sun shades, a graduated scale and a micrometer drum gauge for accurate measurements. Look up sextant in Wiktionary, the free dictionary.

    Most sextants mount a 1 or 3-power monocular for viewing.

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