The Practice of Navigation: And Nautical AstronomyJ. D. Potter, 1882 - 910 sider |
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Side x
... Directions . Although some results of the kind might be advantageously placed in a general work on navigation , yet the uncertainty of almost all that has been published , and the difficulty of collecting better materials , will , it is ...
... Directions . Although some results of the kind might be advantageously placed in a general work on navigation , yet the uncertainty of almost all that has been published , and the difficulty of collecting better materials , will , it is ...
Side 19
... direction from a certain point , which need not here be further discussed . The index of such a log . is called negative ; and as this is embarrassing to beginners , 10 is added to the index 0 , whereby 1 less gives 9. But 9 is the ...
... direction from a certain point , which need not here be further discussed . The index of such a log . is called negative ; and as this is embarrassing to beginners , 10 is added to the index 0 , whereby 1 less gives 9. But 9 is the ...
Side 23
... directions in which they lie : thus A B C , or B , is the angle contained by the two lines B A , B C , which are called the legs . B An angle is not changed by increasing or diminishing the length of the legs , because the length of ...
... directions in which they lie : thus A B C , or B , is the angle contained by the two lines B A , B C , which are called the legs . B An angle is not changed by increasing or diminishing the length of the legs , because the length of ...
Side 56
... direction . Difference of latitude is also called Northing and Southing , and is marked N. or S. It is then said to be one of these names . 189. It is evident , that when two places are on the same side of the equator , their diff . lat ...
... direction . Difference of latitude is also called Northing and Southing , and is marked N. or S. It is then said to be one of these names . 189. It is evident , that when two places are on the same side of the equator , their diff . lat ...
Side 60
... direction of the two objects intersecting or crossing each other at the place of the observer . 202. LEEWAY is the angle included between the direction of the ship's keel and the direction of the wake she leaves on the surface of the ...
... direction of the two objects intersecting or crossing each other at the place of the observer . 202. LEEWAY is the angle included between the direction of the ship's keel and the direction of the wake she leaves on the surface of the ...
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The Practice of Navigation and Nautical Astronomy Henry Raper Ingen forhåndsvisning tilgjengelig - 2018 |
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.