The Practice of Navigation: And Nautical AstronomyJ. D. Potter, 1882 - 910 sider |
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Side vi
... obtained , is too often lost for the day . The approximate solution of the double altitude , as a question of Time , will be found , it is hoped , well adapted to general use : since , unless the latitude by account is very much in ...
... obtained , is too often lost for the day . The approximate solution of the double altitude , as a question of Time , will be found , it is hoped , well adapted to general use : since , unless the latitude by account is very much in ...
Side viii
... obtained . On the same principle , some of the logarithms are given to three places only . The log . sine square of half the arc , Table 61 , universally familiar to seamen in finding the time , is given , for the convenience of this ...
... obtained . On the same principle , some of the logarithms are given to three places only . The log . sine square of half the arc , Table 61 , universally familiar to seamen in finding the time , is given , for the convenience of this ...
Side 7
... obtained by pointing off both figures of 52 thus , 52 . Ex . 4. Divide 338.4 by 9'4 . 9'4 ) 338-4 ( 36 282 564 564 Here the dividend has one decimal , and the divisor also one , or as many , and the quotient is therefore an integer ...
... obtained by pointing off both figures of 52 thus , 52 . Ex . 4. Divide 338.4 by 9'4 . 9'4 ) 338-4 ( 36 282 564 564 Here the dividend has one decimal , and the divisor also one , or as many , and the quotient is therefore an integer ...
Side 13
... obtaining between the men and their work , we have 5 men 20 yards : 11 men : number of yards required . This process is called the Rule of Three . ( 3. ) They , however , who are practically familiar with ratio , or proportion ...
... obtaining between the men and their work , we have 5 men 20 yards : 11 men : number of yards required . This process is called the Rule of Three . ( 3. ) They , however , who are practically familiar with ratio , or proportion ...
Side 14
... obtain as complete a solution as the question allows , we must take each boat's performance separately , and add them all up . Ex.6 . The change of the sun's declination in 1 day is 18 ′ 21 ′′ ; find the change for 1h 34 " . 24h ( 1440m ) ...
... obtain as complete a solution as the question allows , we must take each boat's performance separately , and add them all up . Ex.6 . The change of the sun's declination in 1 day is 18 ′ 21 ′′ ; find the change for 1h 34 " . 24h ( 1440m ) ...
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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.