The practice of navigation and nautical astronomy. [With] Tables [and] Supplement to the first ed, Volume 261870 |
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Page vi
... altitude to the meridian , will be found greatly abridged ; and a table is added for the purpose of shewing the ... altitude is not exactly obtained , is too often lost for the day . The approximate solution of the double altitude , as a ...
... altitude to the meridian , will be found greatly abridged ; and a table is added for the purpose of shewing the ... altitude is not exactly obtained , is too often lost for the day . The approximate solution of the double altitude , as a ...
Page xviii
... ALTITUDE OF THE SAME 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 ....... ... 187 188 189 198 200 206 212 222 225 225 231 .... 237 252 ...
... ALTITUDE OF THE SAME 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 ....... ... 187 188 189 198 200 206 212 222 225 225 231 .... 237 252 ...
Page xxi
... Altitude of a Body upon the Prime Vertical 619 620 30. Apparent Dip of the Sea Horizon 625 31. Mean Astronomical ... Altitude , and Semidiameter 627 35. Dip of the Shore Horizon 627 36. Corresponding Thermometers 628 37. Corresponding ...
... Altitude of a Body upon the Prime Vertical 619 620 30. Apparent Dip of the Sea Horizon 625 31. Mean Astronomical ... Altitude , and Semidiameter 627 35. Dip of the Shore Horizon 627 36. Corresponding Thermometers 628 37. Corresponding ...
Page 42
... altitude are proportional to their bases . The altitude is the perpendicular distance of the vertex , or summit , from the base . AA B F Let the base BC of the triangle A B C be divided into any num ber of equal parts , as three , Bg ...
... altitude are proportional to their bases . The altitude is the perpendicular distance of the vertex , or summit , from the base . AA B F Let the base BC of the triangle A B C be divided into any num ber of equal parts , as three , Bg ...
Page 43
... altitude , viz . the perpendicular drawn from E on A B , we have triangle A D E triangle E DB :: AD : D B. Also since the triangles A DE , EDC have the same altitude , viz . the perpendicular from D on A C , triangle A DE : triangle EDC ...
... altitude , viz . the perpendicular drawn from E on A B , we have triangle A D E triangle E DB :: AD : D B. Also since the triangles A DE , EDC have the same altitude , viz . the perpendicular from D on A C , triangle A DE : triangle EDC ...
Other editions - View all
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...