The Practice of Navigation: And Nautical AstronomyJ. D. Potter, 1882 - 910 sider |
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Side vi
... error . This table will be found , it is presumed , of considerable utility , as it is perhaps from the want of some specific information as to the degree of confidence which it is safe to place in the result , no less than of a short ...
... error . This table will be found , it is presumed , of considerable utility , as it is perhaps from the want of some specific information as to the degree of confidence which it is safe to place in the result , no less than of a short ...
Side vii
... error of the latitude by account . The first approximate method of clearing the lunar distance is new , being effected , like many other problems , by the Spherical Traverse Table . The rigorous method is a modification of Borda's , and ...
... error of the latitude by account . The first approximate method of clearing the lunar distance is new , being effected , like many other problems , by the Spherical Traverse Table . The rigorous method is a modification of Borda's , and ...
Side ix
... error of a chronometer may be ascertained on every occasion of making the land . It will not be out of place to remark here that it is high time the chronometer should be found , like the compass , among the stores of every vessel ...
... error of a chronometer may be ascertained on every occasion of making the land . It will not be out of place to remark here that it is high time the chronometer should be found , like the compass , among the stores of every vessel ...
Side xxii
... Error of Observation arising from an Error of the Parallelism of the Line of Sight ... 647 55. For correcting the Lunar Distance for the Sphe- roidal Figure of the Earth .... 647 LONGITUDE . 56. For computing the Moon's Second ...
... Error of Observation arising from an Error of the Parallelism of the Line of Sight ... 647 55. For correcting the Lunar Distance for the Sphe- roidal Figure of the Earth .... 647 LONGITUDE . 56. For computing the Moon's Second ...
Side 51
... error . Every result , therefore , is , to some extent , uncertain ; but the amount of error of the final result * Solutions of this kind are usually divided into " rigorous and " approximate , " or indirect , as the latter are also ...
... error . Every result , therefore , is , to some extent , uncertain ; but the amount of error of the final result * Solutions of this kind are usually divided into " rigorous and " approximate , " or indirect , as the latter are also ...
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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.