The Practice of Navigation: And Nautical AstronomyJ. D. Potter, 1882 - 910 sider |
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Side vi
... bearing , and by its altitude observed above the sea - horizon . The seaman will find every necessary information on the subject of local magnetic deviation . The highly useful problem of determining the latitude at sea , by the ...
... bearing , and by its altitude observed above the sea - horizon . The seaman will find every necessary information on the subject of local magnetic deviation . The highly useful problem of determining the latitude at sea , by the ...
Side xvii
... Bearing and Distance 114 II . DETERMINATION OF DISTANCE 114 III . METHODS BY THE CHART .. .... 120 V. CHARTS 122 .... I. USE OF MERCATOR'S CHART 123 II . CONSTRUCTION OF MERCATOR'S CHART .. III . PROPERTIES OF CERTAIN PROJECTIONS 127 ...
... Bearing and Distance 114 II . DETERMINATION OF DISTANCE 114 III . METHODS BY THE CHART .. .... 120 V. CHARTS 122 .... I. USE OF MERCATOR'S CHART 123 II . CONSTRUCTION OF MERCATOR'S CHART .. III . PROPERTIES OF CERTAIN PROJECTIONS 127 ...
Side xix
... BEARINGS 313 IX . THE TIDES 317 I. PHENOMENA OF THE TIDES 317 II . RULES FOR FINDING THE TIME OF HIGH WATER .. 323 III . TIDE OBSERVATIONS .. 326 NAVIGATING THE SHIP . I. SHAPING THE COURSE IJ . PLACE OF THE SHIP III . DETERMINING THE ...
... BEARINGS 313 IX . THE TIDES 317 I. PHENOMENA OF THE TIDES 317 II . RULES FOR FINDING THE TIME OF HIGH WATER .. 323 III . TIDE OBSERVATIONS .. 326 NAVIGATING THE SHIP . I. SHAPING THE COURSE IJ . PLACE OF THE SHIP III . DETERMINING THE ...
Side xx
... Bearings and the Distance run between them 500 8. True Depression or Distance of the Sea Horizon 501 9. Number of Feet subtending an Angle of l'at Different Distances .. 10. Maritime Positions 501 502 11. Approximate Variation of the ...
... Bearings and the Distance run between them 500 8. True Depression or Distance of the Sea Horizon 501 9. Number of Feet subtending an Angle of l'at Different Distances .. 10. Maritime Positions 501 502 11. Approximate Variation of the ...
Side 52
... bearing . 2. Degree of Dependance . 170. The result of every computation is , as above remarked , No. 168 , more or less uncertain . If we knew the error in one of the elements , we could easily find the effect it would produce on the ...
... bearing . 2. Degree of Dependance . 170. The result of every computation is , as above remarked , No. 168 , more or less uncertain . If we knew the error in one of the elements , we could easily find the effect it would produce on the ...
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The Practice of Navigation and Nautical Astronomy (Classic Reprint) Henry Raper Ingen forhåndsvisning tilgjengelig - 2017 |
The Practice of Navigation and Nautical Astronomy Henry Raper Ingen forhåndsvisning tilgjengelig - 2018 |
Vanlige uttrykk og setninger
add the log altitude alts appears azim azimuth bearing celestial body centre chron chronometer circle compass Computation corr correction cosec D.Lat Dist decimal decl declination deviation diff difference direction divided employed equal equator error exceeds extr feet given gives greater Greenwich Date height of eye Hence horizon hour-angle interval latitude less logarithms longitude lunar magnetic mean measured meridian method miles moon moon's Nautical Almanac nearly noon observation parallax parallel Parallel Sailing Plane Sailing pole port prime vertical prop quantity reckoned reduce refraction result rhumb line Right Ascension sailing Semid sextant shews ship ship's side sine star subtract sum rejecting tens sun's TRAVERSE TABLE triangle true true alt variation watch
Populære avsnitt
Side 41 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle; and the angle in a segment less than a semicircle is greater than a right angle.
Side 19 - The characteristic of a number less than 1 is found by subtracting from 9 the number of ciphers between the decimal point and the first significant digit, and writing — 10 after the result.
Side 38 - A parallelogram is a four.sided figure, of which the opposite sides are parallel; and the diameter is the straight line joining two of its opposite angles.
Side vii - This is the more important, as very indistinct and erroneous notions prevail among practical persons on the subject of accuracy of computation ; and much time is, in consequence, often lost in computing to a degree of precision wholly inconsistent with that of the elements themselves. The mere habit of working invariably to a useless precision, while it can never advance the computer's knowledge of the subject, has the unfavourable tendency of deceiving those who are not aware of the true nature...
Side 147 - For the same body the semidiameter varies with the distance; thus, the difference of the sun's semidiameter at different times of the year is due to the change of the earth's distance from the sun; and similarly for the moon and the planets.
Side 22 - A CIRCLE is a figure bounded by a curve line called the circumference,* of which every point is at the same distance from a point within, called the centre. Thus, ABD is a circle, and C the centre.
Side 43 - ... section shall be parallel to the remaining side of the triangle. Let DE be drawn parallel to BC, one of the sides of the triangle ABC: then BD shall be to DA, as CE to EA. Join BE, CD; then the triangle BDE is equal...
Side 37 - ... the three interior angles of' a triangle are together equal to two right angles.
Side 39 - Hence it is plain that triangles on the same or equal bases, and between the same parallels, are equal, seeing (by cor.
Side 105 - The distance between two points on the surface of a sphere is the length of the minor arc of a great circle between them.