The Practice of Navigation: And Nautical AstronomyJ. D. Potter, 1882 - 910 σελίδες |
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Σελίδα 61
... ALTITUDE of a terrestrial or celes- tial object above the sea horizon is the angle included between the line drawn from the eye to the object , and the line from the eye to the horizon . Thus , the angle M A B is the altitude of the ...
... ALTITUDE of a terrestrial or celes- tial object above the sea horizon is the angle included between the line drawn from the eye to the object , and the line from the eye to the horizon . Thus , the angle M A B is the altitude of the ...
Σελίδα 116
... height . * A mode- rate breeze in the direction of the sound causes a variation of about 20 feet a second in the ... eye in Table 8 , increased by about of itself . Thus , if the eye be twenty feet above the sea , the horizon is distant ...
... height . * A mode- rate breeze in the direction of the sound causes a variation of about 20 feet a second in the ... eye in Table 8 , increased by about of itself . Thus , if the eye be twenty feet above the sea , the horizon is distant ...
Σελίδα 117
... altitude exceeds 3 ° see No. 359 . 357. The Computation . Alt . under 3 ° . ( 1. ) index error ( No. 496 ) , and subtract from it distance ; the remainder is the true alt . Correct the alt . for of the estimated When the height of the eye ...
... altitude exceeds 3 ° see No. 359 . 357. The Computation . Alt . under 3 ° . ( 1. ) index error ( No. 496 ) , and subtract from it distance ; the remainder is the true alt . Correct the alt . for of the estimated When the height of the eye ...
Σελίδα 118
And Nautical Astronomy Henry Raper. mean , 19 ′ 41 ′′ ; height of the eye , 18 feet ; height of the Peak , 12172 feet : required its Distance . Alt . Depr . Rem . 20 ' Square of Depr . to 12200 ft . 13689 Ditto of Rem . 16 ' Depr . 118 ...
And Nautical Astronomy Henry Raper. mean , 19 ′ 41 ′′ ; height of the eye , 18 feet ; height of the Peak , 12172 feet : required its Distance . Alt . Depr . Rem . 20 ' Square of Depr . to 12200 ft . 13689 Ditto of Rem . 16 ' Depr . 118 ...
Σελίδα 119
... altitude was taken . Ex . 1. Observed altitude of Mount Etna , 1 ° 28 ′ ; estimated distance , 20 leagues . When 38 miles nearer , observed the altitude 5 ° 15 ' ; height of the eye , 30 feet : required the Distance . 1 ° 28 ...
... altitude was taken . Ex . 1. Observed altitude of Mount Etna , 1 ° 28 ′ ; estimated distance , 20 leagues . When 38 miles nearer , observed the altitude 5 ° 15 ' ; height of the eye , 30 feet : required the Distance . 1 ° 28 ...
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 called celestial body centre chart chron chronometer circle compass Computation corr correction cosec Course and Distance D.Lat decimal decl declination deviation diff difference direction Dist divided employed equal equator error exceeds feet find the Course fraction given gives greater height of eye Hence horizon hour-angle interval latitude less logarithms longitude magnetic magnetic bearing mean measured meridian method miles moon moon's multiplied Nautical Almanac nearly noon observation parallax parallel Parallel Sailing Plane Sailing pole prime vertical prop quantity radius ratio reckoned reduce refraction result rhumb line right angles Right Ascension sailing Semid sextant shews ship ship's head side sine star subtract 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.