# A Complete Epitome of Practical Navigation, and Nautical Astronomy: Containing All Necessary Instructions for Keeping a Ship's Reckoning at Sea

Imray, Laurie, Norie and Wilson, 1917 - 595 sider

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### Innhold

 Tables useful in Navigation and Nautical Astronomy 2 Logarithms 13 Geometry 25 Plane Trigonometry 40 Spherical Trigonometry 62 Figlre Drawing 68 Geography and Navigation 74 Marine Surveying 83
 Traverse Sailing 281 Parallel Sailing 288 Mercators Sailing 298 Current Sailing 306 Oblique Sailing and Taking the Departure 316 Correction of Courses 331 331 Napiers Diagram 340 The Days Work 352

### Populære avsnitt

Side 223 - January 31, February 28, March 31, April 30, May 31, June 30, July 31, August 31, September 30, October 31, November 30, December 31.
Side 37 - The square described on the hypothenuse of a right-angled triangle is equivalent to the sum of the squares described on the other two sides.
Side 221 - Ascension, and the interval between the departure of any meridian from the mean Sun and its succeeding return to it is the duration of the mean solar day. Clocks and chronometers are adjusted to mean solar time ; so that a complete revolution (through 24 hours) of the hour hand of...
Side 26 - The circumference of a circle is divided into 360 equal parts, called degrees; each degree into 60 minutes ; each minute into 60 seconds.
Side 199 - The Ram, the Bull, the heavenly Twins, And next the Crab the Lion shines, The Virgin and the Scales ; The Scorpion, Archer, and He-goat, The Man that holds the watering-pot, And Fish with glittering tails.
Side 21 - DIVISION BY LOGARITHMS. RULE. From the logarithm of the dividend subtract the logarithm of the divisor, and the number answering to the remainder will be the quotient required.
Side 74 - The shortest DISTANCE between two points on the surface of a sphere is the arc of a great circle passing through those points.
Side 36 - Jf a straight line fall upon two parallel straight lines, it makes the alternate angles equal to one another ; and the exterior angle equal to the interior and opposite upon the same side ; and likewise the two interior angles upon the same side together equal to two right angles.
Side 161 - The relative effects of these two bodies on the oceanic waters are directly as their mass, and inversely as the square of their distance...
Side 36 - IF a straight line falling upon two other straight lines makes the exterior angle equal to the interior and opposite upon the same side of the line ; or makes the interior angles upon the same side together equal to two right angles ; the two straight lines shall be parallel to one another.