The Practice of Navigation: And Nautical AstronomyJ. D. Potter, 1882 - 910 σελίδες |
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Σελίδα v
... circle . The study of its contents demands no previous attainments beyond the knowledge of the elements of arithmetic . Every endeavour has been made to render the whole easy of reference , and to adapt it to the use of those who may ...
... circle . The study of its contents demands no previous attainments beyond the knowledge of the elements of arithmetic . Every endeavour has been made to render the whole easy of reference , and to adapt it to the use of those who may ...
Σελίδα vi
... Circle is , in this work , reduced , like Plane Sailing , to Inspection , by means of the SPHERICAL TRAVERSE TABLE . Convenient rules are given for finding the distance of the land by its change of bearing , and by its altitude observed ...
... Circle is , in this work , reduced , like Plane Sailing , to Inspection , by means of the SPHERICAL TRAVERSE TABLE . Convenient rules are given for finding the distance of the land by its change of bearing , and by its altitude observed ...
Σελίδα xvii
... CIRCLE SAILING 105 IV . TAKING Departures . 114 I. BY A SINGLe Bearing and Distance 114 II . DETERMINATION OF DISTANCE 114 III . METHODS BY THE CHART .. .... 120 V. CHARTS 122 .... I. USE OF MERCATOR'S CHART 123 II . CONSTRUCTION OF ...
... CIRCLE SAILING 105 IV . TAKING Departures . 114 I. BY A SINGLe Bearing and Distance 114 II . DETERMINATION OF DISTANCE 114 III . METHODS BY THE CHART .. .... 120 V. CHARTS 122 .... I. USE OF MERCATOR'S CHART 123 II . CONSTRUCTION OF ...
Σελίδα 22
... circle , and C the centre . B .C 75. The circumference is divided into 360 equal parts , called degrees , written ... circle and circumference are often used indifferently the one for the other , but circle is properly the surface or ...
... circle , and C the centre . B .C 75. The circumference is divided into 360 equal parts , called degrees , written ... circle and circumference are often used indifferently the one for the other , but circle is properly the surface or ...
Σελίδα 23
... circle into two equal parts , the four equal parts , A D , B D , BE , E A , are called quadrants , and each of such portions of the circum- ference measures 90 ° . 80. Any portion of the circumference is called an arc , and the line ...
... circle into two equal parts , the four equal parts , A D , B D , BE , E A , are called quadrants , and each of such portions of the circum- ference measures 90 ° . 80. Any portion of the circumference is called an arc , and the line ...
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.