The Practice of Navigation: And Nautical AstronomyJ. D. Potter, 1882 - 910 sider |
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Side 44
... sine of the angle PCA ( to which it is opposite ) . When the arc is very small , or P very near A , PN and A P , or the arc and sine , nearly coincide . When the arc is 0 , the sine is 0. When the arc is 90 ° , P falls at B , or the sine ...
... sine of the angle PCA ( to which it is opposite ) . When the arc is very small , or P very near A , PN and A P , or the arc and sine , nearly coincide . When the arc is 0 , the sine is 0. When the arc is 90 ° , P falls at B , or the sine ...
Side 45
... sine may be taken for each other , and for the arc . When the arc is 90 ° , the tangent is infinitely great . The tangent is less than the radius , according as the angle is less or greater than 45 ° . The cotangent is the tangent of ...
... sine may be taken for each other , and for the arc . When the arc is 90 ° , the tangent is infinitely great . The tangent is less than the radius , according as the angle is less or greater than 45 ° . The cotangent is the tangent of ...
Side 46
... sin C ( by 152 ) . The second triangle , P N C , is , in fact , here referred to for illustration only ; for it is evident , without it , that CA and A B themselves stand in the same relation to each other as that of radius and sine ...
... sin C ( by 152 ) . The second triangle , P N C , is , in fact , here referred to for illustration only ; for it is evident , without it , that CA and A B themselves stand in the same relation to each other as that of radius and sine ...
Side 47
... sin . C , = whence ( No. 46 ) A B C Ax sin . C ( the I not being written ) . Now the sine of 29 ° 52 ′ , given in tables of natural sines ( of which the logs . are given in Table 68 ) is 0-498 nearly , hence A B = 37 x 0.498 = 18.426 ...
... sin . C , = whence ( No. 46 ) A B C Ax sin . C ( the I not being written ) . Now the sine of 29 ° 52 ′ , given in tables of natural sines ( of which the logs . are given in Table 68 ) is 0-498 nearly , hence A B = 37 x 0.498 = 18.426 ...
Side 48
... sine of A ( No. 163 ) , hence CA CB rad . : sin . A ; in which CB , a mean term , is required . Hence , by No. 166 ( 1 ) , we have to add the logs . of CA and sin . A , and subtract the log . 10 . c B If CA , the hypothenuse , be radius ...
... sine of A ( No. 163 ) , hence CA CB rad . : sin . A ; in which CB , a mean term , is required . Hence , by No. 166 ( 1 ) , we have to add the logs . of CA and sin . A , and subtract the log . 10 . c B If CA , the hypothenuse , be radius ...
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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.