The Practice of Navigation: And Nautical AstronomyJ. D. Potter, 1882 - 910 σελίδες |
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Σελίδα viii
... positions , and relative positions , being distinct things , and the latter being by far of the greater consequence to navigation , it is necessary , pre- paratory to a complete and final arrangement , to separate these two kinds of ...
... positions , and relative positions , being distinct things , and the latter being by far of the greater consequence to navigation , it is necessary , pre- paratory to a complete and final arrangement , to separate these two kinds of ...
Σελίδα ix
... positions , of which the number assumed is eighteen , being considerably distant from each other , are deter- mined nearly enough for present purposes , and would , according to the system proposed , be finally settled by long series of ...
... positions , of which the number assumed is eighteen , being considerably distant from each other , are deter- mined nearly enough for present purposes , and would , according to the system proposed , be finally settled by long series of ...
Σελίδα 78
... position of every portion of the iron in the ship , will be changed more or less by every change of such position . If ... positions . The plate is accompanied with necessary directions for its use . As the plate is fixed very near the ...
... position of every portion of the iron in the ship , will be changed more or less by every change of such position . If ... positions . The plate is accompanied with necessary directions for its use . As the plate is fixed very near the ...
Σελίδα 159
... position of the equator , and the relations among the Latitude of the place , the Time , and the Hour - angle , Altitude ... positions of the celestial bodies by a circular card , as a compass - card , having the hours marked on the edge ...
... position of the equator , and the relations among the Latitude of the place , the Time , and the Hour - angle , Altitude ... positions of the celestial bodies by a circular card , as a compass - card , having the hours marked on the edge ...
Σελίδα 282
... positions on the chart . ( 5. ) The extreme difference of the greatest and least results by the different chronometers employed should be stated , as this shews whether the chronometers went well together or not ; for , though their ...
... positions on the chart . ( 5. ) The extreme difference of the greatest and least results by the different chronometers employed should be stated , as this shews whether the chronometers went well together or not ; for , though their ...
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.