The practice of navigation and nautical astronomy. [With] Tables [and] Supplement to the first ed, Τόμος 261870 |
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Σελίδα vi
... horizon . The seaman will find every necessary information on the subject of local magnetic deviation . The highly useful problem of determining the latitude at sea , by the reduction of an altitude to the meridian , will be found ...
... horizon . The seaman will find every necessary information on the subject of local magnetic deviation . The highly useful problem of determining the latitude at sea , by the reduction of an altitude to the meridian , will be found ...
Σελίδα xviii
... HORIZON III . THE CHRONOMETER III . TAKING OBSERVATIONS .... I. OBSERVING ALTITUDES ... 143 160 160 170 173 175 ... 175 II . OBSERVATIONS WITH AND WITHOUT ASSISTANTS .. 183 III . EMPLOYMENT OF THE HACK WATCH IV . FINDING THE STARS 184 ...
... HORIZON III . THE CHRONOMETER III . TAKING OBSERVATIONS .... I. OBSERVING ALTITUDES ... 143 160 160 170 173 175 ... 175 II . OBSERVATIONS WITH AND WITHOUT ASSISTANTS .. 183 III . EMPLOYMENT OF THE HACK WATCH IV . FINDING THE STARS 184 ...
Σελίδα xx
... Horizon 501 9. Number of Feet subtending an Angle of l ' at Different Distances ... 10. Maritime Positions .. .. 501 502 11. Approximate Variation of the Compass 590 12. Passages . 13. Tide - Hours 592 596 14. Epacts 599 TIDES . 15 ...
... Horizon 501 9. Number of Feet subtending an Angle of l ' at Different Distances ... 10. Maritime Positions .. .. 501 502 11. Approximate Variation of the Compass 590 12. Passages . 13. Tide - Hours 592 596 14. Epacts 599 TIDES . 15 ...
Σελίδα xxi
... Horizon 625 31. Mean Astronomical Refraction 625 32. Correction of the Mean Refraction for the Height of the Thermometer 626 33. Correction of the Mean Refraction for the Height of the Barometer 627 34. The Sun's Parallax in Altitude ...
... Horizon 625 31. Mean Astronomical Refraction 625 32. Correction of the Mean Refraction for the Height of the Thermometer 626 33. Correction of the Mean Refraction for the Height of the Barometer 627 34. The Sun's Parallax in Altitude ...
Σελίδα xxii
... Horizon , for the Effect of Refraction 650 on the ...... ... 650 TO SUPPLY 60. Declination of the Sun .... 652 THE PLACE OF THE NAUTICAL ALMANAC . 62. The Equation of Time .. 63. Mean Places of Stars · 60A . Correction of the Sun's ...
... Horizon , for the Effect of Refraction 650 on the ...... ... 650 TO SUPPLY 60. Declination of the Sun .... 652 THE PLACE OF THE NAUTICAL ALMANAC . 62. The Equation of Time .. 63. Mean Places of Stars · 60A . Correction of the Sun's ...
Άλλες εκδόσεις - Προβολή όλων
The practice of navigation and nautical astronomy. [With] Tables [and ... Henry Raper Πλήρης προβολή - 1840 |
The Practice Of Navigation And Nautical Astronomy. [with] Tables [and ... Henry Raper Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2019 |
The Practice Of Navigation And Nautical Astronomy. [with] Tables [and ... Henry Raper Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2022 |
Συχνά εμφανιζόμενοι όροι και φράσεις
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
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 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...
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 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 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 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.
Σελίδα 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.
Σελίδα 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.
Σελίδα 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.
Σελίδα 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...