## 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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24 hours Answers apparent apparent altitude apply astronomical called celestial chronometer showed circle compass course course and distance deviation diff difference of latitude direction dist earth east equation error EXAMPLES feet given greater Greenwich date haversines head heavenly body height of eye horizon hour angle index correction interval July June logarithm longitude lower limb March mean sun mean time nearly method miles minutes moon moon's names Nautical Almanac observed altitude observed meridian altitude pass pole reduce rejecting remainder required the latitude required the true result right ascension Rule sailed semi semidiameter ship mean sidereal solar star Star's subtract Sun's declination supposed taken true altitude true bearing true course true difference variation vers zenith distance

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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...