The Practice of Navigation: And Nautical AstronomyJ. D. Potter, 1882 - 910 sider |
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Side viii
... body of each table . In the logarithms six places of figures only are employed , because a single result in which six places are necessary cannot be depended upon to the degree of precision obtained . On the same principle , some of the ...
... body of each table . In the logarithms six places of figures only are employed , because a single result in which six places are necessary cannot be depended upon to the degree of precision obtained . On the same principle , some of the ...
Side xviii
... BODY IV . BY DOUBLE ALTITUde of diffERENT BODIES V. BY THE ALTITUDE OF THE POLE STAR VI . FINDING THE TIME .... I. BY A SINGLE ALTITUDE .. 225 225 231 237 .... 252 259 260 260 II . BY DIFFERENCE OF ALTITUDE NEAR THE MERIDIAN 267 III ...
... BODY IV . BY DOUBLE ALTITUde of diffERENT BODIES V. BY THE ALTITUDE OF THE POLE STAR VI . FINDING THE TIME .... I. BY A SINGLE ALTITUDE .. 225 225 231 237 .... 252 259 260 260 II . BY DIFFERENCE OF ALTITUDE NEAR THE MERIDIAN 267 III ...
Side xxi
... Body upon the Prime Vertical 30. Apparent Dip of the Sea Horizon 31. Mean Astronomical Refraction 620 625 625 32. Correction of the Mean Refraction for the Height of the Thermometer . .... 33. Correction of the Mean Refraction for the ...
... Body upon the Prime Vertical 30. Apparent Dip of the Sea Horizon 31. Mean Astronomical Refraction 620 625 625 32. Correction of the Mean Refraction for the Height of the Thermometer . .... 33. Correction of the Mean Refraction for the ...
Side 14
... most practical * The argument is the quantity at the side or head of the Table , for which the terms or quantities in the body of the table are given . purposes , to take a quantity , somewhere between the 14 INTRODUCTION .
... most practical * The argument is the quantity at the side or head of the Table , for which the terms or quantities in the body of the table are given . purposes , to take a quantity , somewhere between the 14 INTRODUCTION .
Side 19
... body of the table , and take out the number from the side column and top . To place the decimal point . Add 1 to the given index of the log . , and mark off to the left this number of figures ; these will be whole numbers ; the rest ...
... body of the table , and take out the number from the side column and top . To place the decimal point . Add 1 to the given index of the log . , and mark off to the left this number of figures ; these will be whole numbers ; the rest ...
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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.