A History of Nautical AstronomyHollis & Carter, 1968 - 387 páginas |
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Página 125
... celestial pole ; N , E , S and W are the pro- jections of the cardinal points of the horizon ; wqe represents the equator ; and WQE is the projection of the equinoctial . Observer's latitude Altitude of celestial pole = arc qo = arc NP ...
... celestial pole ; N , E , S and W are the pro- jections of the cardinal points of the horizon ; wqe represents the equator ; and WQE is the projection of the equinoctial . Observer's latitude Altitude of celestial pole = arc qo = arc NP ...
Página 130
... celestial pole . On two occasions each day the altitude of the Pole Star is equal to an observer's latitude ; but never does its altitude differ by more than a small angle from the latitude . Henry's navigators were taught to observe ...
... celestial pole . On two occasions each day the altitude of the Pole Star is equal to an observer's latitude ; but never does its altitude differ by more than a small angle from the latitude . Henry's navigators were taught to observe ...
Página 344
... celestial sphere relative to the First Point of Aries , the arc of the ecliptic contained between the First Point of ... pole through the observer's zenith is called the observer's upper celes- tial meridian . The other half , which extends ...
... celestial sphere relative to the First Point of Aries , the arc of the ecliptic contained between the First Point of ... pole through the observer's zenith is called the observer's upper celes- tial meridian . The other half , which extends ...
Contenido
Preface by Alton B Moody ix | 11 |
Astronomical Methods of Timemeasuring at Sea | 32 |
The Altitudemeasuring Instruments of Navigation | 57 |
Derechos de autor | |
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Términos y frases comunes
apparent altitude astrolabe astronomical navigation azimuth calculated celestial body celestial horizon celestial meridian celestial pole celestial sphere centre chronometer computed correction cosec cosine cross-staff described difference double-altitude problem Earth eclipses equal altitude equation equinoctial error ex-meridian finding latitude finding longitude fixed stars formula given Greenwich haversines heavenly body Hipparchus hour angle instrument invention known latitude and longitude logarithms longitude at sea longitude by chronometer lunar distance Maskelyne mathematical means measuring meridian altitude meridian passage method for finding minutes of arc Moon Moon's motion Nautical Almanac nautical astronomy Nautical Magazine noon observed object observer's parallax plane polar distance Pole Star position line practical published PZX triangle quadrant refraction Right Ascension rule satellites seamen sextant ship ship's position sight sin² solution spherical triangle Sumner's method Sun's declination tion trigonometry tude values vane vers vertical zenith distance
Referencias a este libro
Cartography in France, 1660-1848: Science, Engineering, and Statecraft Josef Konvitz Vista previa limitada - 1987 |
Prologue to Lewis and Clark: The Mackay and Evans Expedition W. Raymond Wood Vista previa limitada - 2005 |