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Categories: Navigational equipment Celestial navigation 1731 introductions Astronomical instruments |
Summary Of: SextantA common use of the sextant is to sight the... the sextant can be used to measure the angle between any two objects... The scale of a sextant has a length of... the sextant allows celestial objects to be measured relative to the horizon... the sextant allows direct observations of stars... This permits the use of the sextant at night when a backstaff is difficult to use... opposed mirrors that subtract the motion of the sextant from the reflection... The sextant is not dependent upon electricity... Using the sextant to measure the altitude of the Sun above the horizon... Using the sextant to measure the altitude of the Sun above the horizon... Using the sextant to measure the... cases so that their sextant can be placed outside the cabin to come to equilibrium with outside temperatures... for the use of a sextant on a Warwick B... for the use of a sextant on a Warwick B... The ball recording sextant was not in fact a sextant at all... the recording sextant found favor with airplane navigators... sextant was invented in the 1797 by... The lifeboat sextant was made in 3... at a known location are compared with Bris sextant sightings when the sun touches the horizon... A sextant is a delicate instrument... Common wisdom is that a used sextant is probably bent... A used sextant lacking a case is very likely to have a bent arc... put on the neck lanyard before removing the sextant from its case and to always case the sextant between sights... For this reason a sextant should be checked frequently for errors and adjusted accordingly... on the arc and hold the sextant horizontally with the arc away from you at arms length and look into the index... The arc of the sextant should appear to continue unbroken into the mirror... The user can hold the sextant on its side and observe the horizon to check the sextant during the day... Move the sextant slightly so that the stars move to the other side of the field of view...Encyclodia Page On: Sextant |
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