The Practice of Navigation: And Nautical AstronomyJ. D. Potter, 1882 - 910 sider |
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Side 22
... centre . Thus , A B D is a circle , and C the centre . B с 75. The circumference is divided into 360 equal parts , called degrees , written thus , 360 ° ; each degree , into sixty equal parts , called minutes ( 60 ) ; each minute into ...
... centre . Thus , A B D is a circle , and C the centre . B с 75. The circumference is divided into 360 equal parts , called degrees , written thus , 360 ° ; each degree , into sixty equal parts , called minutes ( 60 ) ; each minute into ...
Side 23
... centre C , exactly as the point of the compasses advances on the circumfe- rence , the angle A C B is measured by the number of degrees in the arc A B. A 83. The arc A B is said to subtend the angle A C B. 84. An angle of 90 ° , as ACD ...
... centre C , exactly as the point of the compasses advances on the circumfe- rence , the angle A C B is measured by the number of degrees in the arc A B. A 83. The arc A B is said to subtend the angle A C B. 84. An angle of 90 ° , as ACD ...
Side 24
... centre . 2. Geometrical Problems . 91. The instruments necessary in constructing the figures in these problems are , a pair of compasses and a straight edge of any kind , as of a ruler , or , when such cannot be had , the back of the ...
... centre . 2. Geometrical Problems . 91. The instruments necessary in constructing the figures in these problems are , a pair of compasses and a straight edge of any kind , as of a ruler , or , when such cannot be had , the back of the ...
Side 25
... centre A , with any convenient radius ( the longer the more accurate ) , describe an arc , CB ; from the centre P , with the same radius , A B , describe an arc , DE ; take the distance from C to B in the com- passes , and put one foot ...
... centre A , with any convenient radius ( the longer the more accurate ) , describe an arc , CB ; from the centre P , with the same radius , A B , describe an arc , DE ; take the distance from C to B in the com- passes , and put one foot ...
Side 26
... from C , as a centre , describe an arc , D E ; then , from D and E as centres , with a convenient radius , describe two arcs cutting each other at I. CI is the perpendicular required . C A D 米 E B ( 2. ) When 26 INTRODUCTION .
... from C , as a centre , describe an arc , D E ; then , from D and E as centres , with a convenient radius , describe two arcs cutting each other at I. CI is the perpendicular required . C A D 米 E B ( 2. ) When 26 INTRODUCTION .
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The Practice of Navigation and Nautical Astronomy Henry Raper Ingen forhåndsvisning tilgjengelig - 2018 |
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 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
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.