The Practice of Navigation: And Nautical AstronomyJ. D. Potter, 1882 - 910 σελίδες |
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Σελίδα 55
... equator ) being nearly 26 more . N W P H E D K F B S 181. The earth turns once round in 24 hours . The line round which it revolves , and which is the shortest diameter , is called the axis , and its extremities are the North and South ...
... equator ) being nearly 26 more . N W P H E D K F B S 181. The earth turns once round in 24 hours . The line round which it revolves , and which is the shortest diameter , is called the axis , and its extremities are the North and South ...
Σελίδα 56
... equator , measured on a meridian ; thus the latitude of a place A is A M , the latitude of B is BK . Latitude is named north or south , according as the place is north or south of the equator . Thus A is in north latitude , B is in ...
... equator , measured on a meridian ; thus the latitude of a place A is A M , the latitude of B is BK . Latitude is named north or south , according as the place is north or south of the equator . Thus A is in north latitude , B is in ...
Σελίδα 57
... equator , at which the latitude begins . But if in north latitude she sails south , or in south latitude she sails north , she diminishes her latitude . Hence , when one latitude and the diff . lat . are given , the other latitude is ...
... equator , at which the latitude begins . But if in north latitude she sails south , or in south latitude she sails north , she diminishes her latitude . Hence , when one latitude and the diff . lat . are given , the other latitude is ...
Σελίδα 58
... equator , and then take the included portion of the equator itself . * 195. When two places are on the same side of the first meridian , their diff . long . is found by subtracting the lesser longitude from the greater ; thus the diff ...
... equator , and then take the included portion of the equator itself . * 195. When two places are on the same side of the first meridian , their diff . long . is found by subtracting the lesser longitude from the greater ; thus the diff ...
Σελίδα 62
... equator ( fig . in p . 55 ) . The sun is vertical at noon twice in the year to every place between the tropics , and never to any place outside of them . be useful ; but there are scarcely any data for the construction of such a table ...
... equator ( fig . in p . 55 ) . The sun is vertical at noon twice in the year to every place between the tropics , and never to any place outside of them . be useful ; but there are scarcely any data for the construction of such a table ...
Άλλες εκδόσεις - Προβολή όλων
The Practice of Navigation and Nautical Astronomy Henry Raper Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2018 |
The Practice of Navigation and Nautical Astronomy (Classic Reprint) Henry Raper Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2017 |
The Practice of Navigation and Nautical Astronomy Henry Raper Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2018 |
Συχνά εμφανιζόμενοι όροι και φράσεις
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
Δημοφιλή αποσπάσματα
Σελίδα 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.
Σελίδα 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.
Σελίδα 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.
Σελίδα 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...
Σελίδα 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.
Σελίδα 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.
Σελίδα 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...
Σελίδα 37 - ... the three interior angles of' a triangle are together equal to two right angles.
Σελίδα 39 - Hence it is plain that triangles on the same or equal bases, and between the same parallels, are equal, seeing (by cor.
Σελίδα 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.