The practice of navigation and nautical astronomy. [With] Tables [and] Supplement to the first ed, Volume 261870 |
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Page xii
... reduce to a practical form every useful consideration which has been suggested by my own experience or by intercourse with eminent officers and men of science , without soliciting the indulgence of the reader to errors and to ...
... reduce to a practical form every useful consideration which has been suggested by my own experience or by intercourse with eminent officers and men of science , without soliciting the indulgence of the reader to errors and to ...
Page xx
... reducing Daily and Twelve - hourly Variations 603 21A . Logarithms for reducing Daily Variations ... 609 22. For reducing the Moon's Declination 23. Acceleration 24. Retardation .... 611 613 613 25. For finding the Equation of Second ...
... reducing Daily and Twelve - hourly Variations 603 21A . Logarithms for reducing Daily Variations ... 609 22. For reducing the Moon's Declination 23. Acceleration 24. Retardation .... 611 613 613 25. For finding the Equation of Second ...
Page xxi
... reducing the true Altitude of the Moon to the apparent Altitude .... 640 45. Parallax in Altitude of a Planet 640 ... Reduction to the CONTENTS . xxi.
... reducing the true Altitude of the Moon to the apparent Altitude .... 640 45. Parallax in Altitude of a Planet 640 ... Reduction to the CONTENTS . xxi.
Page xxii
... Reduction to the Meridian in Seconds 50. For computing the Second Reduction in Seconds 642 643 645 51. Correction of the Altitude of the Pole Star ..... 646 52. Reduction of Latitude 647 53. Correction of the Lunar Distance for the Con ...
... Reduction to the Meridian in Seconds 50. For computing the Second Reduction in Seconds 642 643 645 51. Correction of the Altitude of the Pole Star ..... 646 52. Reduction of Latitude 647 53. Correction of the Lunar Distance for the Con ...
Page 3
... reduce and to the same denominator , multiply the numerator and denominator of 3 by 11 , which gives 3 , and by 12 ... Reduce , and II I Ex . 2. Reduce , and Ex . 3. Reduce , and 315 ' 315 ' 315 7 7 2 X 15 X 7 IX3X7 1X3 X 15 3 x 15 x 7 ...
... reduce and to the same denominator , multiply the numerator and denominator of 3 by 11 , which gives 3 , and by 12 ... Reduce , and II I Ex . 2. Reduce , and Ex . 3. Reduce , and 315 ' 315 ' 315 7 7 2 X 15 X 7 IX3X7 1X3 X 15 3 x 15 x 7 ...
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The Practice Of Navigation And Nautical Astronomy. [with] Tables [and ... Henry Raper No preview available - 2019 |
The Practice Of Navigation And Nautical Astronomy. [with] Tables [and ... Henry Raper No preview available - 2022 |
Common terms and phrases
add the log altitude alts appears azim azimuth bearing called celestial body celestial equator centre chart chronometer circle colat 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 Greenwich Date height of eye Hence horizon interval latitude less logarithms longitude magnetic magnetic bearing measured meridian miles minutes moon moon's multiplied Nautical Almanac nearly observation parallax parallel Parallel Sailing passes Plane Sailing planet pole prime vertical prop quantity radius reckoned reduce refraction result rhumb line right angles Right Ascension sailing Semid sextant shews ship side sine star subtract sum rejecting tens sun's Traverse Table triangle true true alt variation watch
Popular passages
Page 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.
Page 147 - Since the apparent altitude is too great on account of refraction, and too small on account of parallax, the diff. between these quantities is the diff. between the true and apparent altitudes. This difference, or the combined effect of parallax and refraction, is called the Correction of Altitude. The moon's Corr. of Alt. is given in Table 39; that of a star is merely its refraction. 439. The SEMI-DIAMETER of a celestial body is half the angle subtended by the diameter of the visible disc. Thus...
Page 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.
Page 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.
Page 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...
Page 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.
Page 186 - A line drawn from Polaris perpendicular to the line of the Pointers, and on the opposite side to the Great Bear, passes, at 48° distance, through CAPELLA, one of the brightest stars. In this same line, about the same distance on the opposite side of the pole, is a.
Page 145 - ... of Altitude are circles parallel to the horizon. 431. ZENITH DISTANCE is the arc included between the zenith and the celestial body, or the angular distance of a body from the zenith of which that arc is the measure. The zenith distance is, therefore, the complement of the altitude to 90°, as Z A.
Page 4 - RULE. Multiply all the numerators together for a new numerator, and all the denominators for a new denominator: then reduce the new fraction to its lowest terms.
Page 358 - Frigate La Venus, 1836-9, vol. iii. p. 419) paid particular attention to this indication, and remarks that the observations generally shew a lowering of the thermometer on approaching land, but they disprove that the water on a bank is always colder.* 1039. The temperature of the sea has been observed to change several degrees, in intervals of time varying from a few hours to a day and a half previous to a change of wind, the water becoming gradually warmer when the wind was about to blow from a...