Navigation and Nautical Astronomy: The Practical Part, Containing Rules for Finding the Latitude and Longitude, and the Variation of the Compass

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John Weale, 1853 - Nautical astronomy - 279 pages
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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...

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