Navigation and Nautical Astronomy: The Practical Part, Containing Rules for Finding the Latitude and Longitude, and the Variation of the CompassJohn Weale, 1853 - 279 pages |
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Page iv
... mean solar day . 61 To find the daily motion of the mean sun in the equator 63 63 64 64 64 Nautical and astronomical day Rules in Nautical Astronomy . 65 I. Given civil or nautical time to find astronomical time II . Given astronomical ...
... mean solar day . 61 To find the daily motion of the mean sun in the equator 63 63 64 64 64 Nautical and astronomical day Rules in Nautical Astronomy . 65 I. Given civil or nautical time to find astronomical time II . Given astronomical ...
Page v
... mean solar time and the equation of time to find apparent solar time , and ... sun's observed altitude to find its true altitude 109 XXVI . Given the ... sun's meridian altitude XXIX . To find the latitude by sun's meridian altitude in ...
... mean solar time and the equation of time to find apparent solar time , and ... sun's observed altitude to find its true altitude 109 XXVI . Given the ... sun's meridian altitude XXIX . To find the latitude by sun's meridian altitude in ...
Page vi
... sun double . XLI . To find the longitude from the above observations XLII . Given , error and rate of chronometer , to find Greenwich mean time at some instant XLIII . To find error of chronometer on mean time at the ship by a single ...
... sun double . XLI . To find the longitude from the above observations XLII . Given , error and rate of chronometer , to find Greenwich mean time at some instant XLIII . To find error of chronometer on mean time at the ship by a single ...
Page 60
... sun's leaving the first point of Aries , and returning to it again . A sidereal year is the interval between the ... mean length of several solar years is therefore the one made use of in the common division of time , and called the mean ...
... sun's leaving the first point of Aries , and returning to it again . A sidereal year is the interval between the ... mean length of several solar years is therefore the one made use of in the common division of time , and called the mean ...
Page 61
... sun separates from the first point of Aries 360 ° , taking into ... mean solar year ; then , 36000 ° 45 ′ 45 ′′ : 360 ° :: 36525a : x .. x ... sun , the arc of the ecliptic described by the sun from the first point of Aries to the first ...
... sun separates from the first point of Aries 360 ° , taking into ... mean solar year ; then , 36000 ° 45 ′ 45 ′′ : 360 ° :: 36525a : x .. x ... sun , the arc of the ecliptic described by the sun from the first point of Aries to the first ...
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Common terms and phrases
Aldebaran altitude for index apparent altitude apparent solar April 27 ascension mean sun celestial equator chro colatitude compass course correction in altitude course and distance decl deviation diff difference of latitude Elements from Nautical equation find the latitude Greenwich date Greenwich mean noon haversines heavenly body height of eye horizontal parallax hour angle Index cor index correction July July 12 June mean time nearly moon Moon's declination moon's semidiameter Nautical Almanac observed altitude observed meridian altitude P.M. mean pass the meridian point of Aries polar distance pole proportional logarithm refraction required the latitude required the longitude required the true Right asc Right ascension mean sea 20 feet ship mean ship's head sidereal clock subtract Sun's declination sun's L. L. sun's lower limb true altitude true bearing true course true difference true distance versine west of meridian zenith distance
Popular passages
Page 12 - Fig. 3) loaded on the circular side with lead sufficient to make it swim upright in the water: to this is fastened a line about 150 fathoms long, called the Log-line, which is divided into certain spaces called knots, and is wound on a reel (see Plate VI.
Page 60 - The hour angle of a heavenly body, is the angle at the pole between the celestial meridian and the circle of declination passing through the place of the body ; thus, zpx is the hour angle of x.
Page 54 - ... whirling motion of the earth about its axis, the parts near the equator, which have the greatest velocity, acquire thereby a greater distance from the centre than the parts near the poles. By actual measurement of a degree of latitude in different parts of the earth, it is found...
Page 61 - The apparent solar day is the interval between two successive transits of the sun's centre over the same meridian.
Page 59 - The right ascension of a heavenly body is the arc of the equator, intercepted between the first point of Aries and the circle of declination, passing through the place of the...