The Practice of Navigation: And Nautical AstronomyJ. D. Potter, 1882 - 910 sider |
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Side vi
... computation , which has often to be conducted in circum- stances of danger , anxiety , or fatigue , and so to ... computations are effected by the well - known methods of inspection and logarithms ; and as the former , it is presumed ...
... computation , which has often to be conducted in circum- stances of danger , anxiety , or fatigue , and so to ... computations are effected by the well - known methods of inspection and logarithms ; and as the former , it is presumed ...
Side vii
... computation of the time is one with which seamen are familiar in the next degree to that of the latitude by meridian altitude . The principle is not new , but rules have not hitherto been given for computing directly the error of the ...
... computation of the time is one with which seamen are familiar in the next degree to that of the latitude by meridian altitude . The principle is not new , but rules have not hitherto been given for computing directly the error of the ...
Side viii
... computation , to every second of the 12 hours . By means of this term tables of versed sines are dispensed with , all our solutions being either numeral or purely logarithmic . I have not , either in the Rules or the Tables , aimed to ...
... computation , to every second of the 12 hours . By means of this term tables of versed sines are dispensed with , all our solutions being either numeral or purely logarithmic . I have not , either in the Rules or the Tables , aimed to ...
Side 50
... Computation ; 3. Construction . ( 1. ) Inspection usually implies taking out , ready calculated , from a table , the result corresponding to the elements of the particular question proposed . The term has , however , a more general ...
... Computation ; 3. Construction . ( 1. ) Inspection usually implies taking out , ready calculated , from a table , the result corresponding to the elements of the particular question proposed . The term has , however , a more general ...
Side 51
... Computation will be em- ployed in other cases , and always when precision is required and logarithms are concerned . * ( 3. ) Construction implies ( in our present subject ) drawing a figure of the actual case on a convenient scale ...
... Computation will be em- ployed in other cases , and always when precision is required and logarithms are concerned . * ( 3. ) Construction implies ( in our present subject ) drawing a figure of the actual case on a convenient scale ...
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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.