The Practice of Navigation: And Nautical AstronomyJ. D. Potter, 1882 - 910 sider |
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Side xxi
... Hour - angle and Altitude of a 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 ...
... Hour - angle and Altitude of a 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 ...
Side 87
... hour . Now AD is the D. Lat . to the Dist . AB , and the angle BAD as Course . BAD equal to 70-45 ° , or 25 ° , and Dist . 54 , give AD equal to 5 knots , the rate required , and AD is A B resolved in the direction AP . P S When the ...
... hour . Now AD is the D. Lat . to the Dist . AB , and the angle BAD as Course . BAD equal to 70-45 ° , or 25 ° , and Dist . 54 , give AD equal to 5 knots , the rate required , and AD is A B resolved in the direction AP . P S When the ...
Side 92
... hour ; the present rate of sailing 7 knots : shape the course so as to keep ... angle 16 ° , which the ship is to steer to the right of the port . P S.S.E. ... angle A would be 16 ° as before , but the distance AC made good by the ship in ...
... hour ; the present rate of sailing 7 knots : shape the course so as to keep ... angle 16 ° , which the ship is to steer to the right of the port . P S.S.E. ... angle A would be 16 ° as before , but the distance AC made good by the ship in ...
Side 145
... hour - angle and azimuth ; and fig . 2 the altitude , when the celestial body is near the horizon . * 424. P , the POLE of the heavens , is the point which remains fixed , whilst the rest of the celestial surface seen above the horizon ...
... hour - angle and azimuth ; and fig . 2 the altitude , when the celestial body is near the horizon . * 424. P , the POLE of the heavens , is the point which remains fixed , whilst the rest of the celestial surface seen above the horizon ...
Side 153
... angles round the poles , which are called , from the division of time inte hours , HOUR - ANGLES . 468. An hour - angle , or horary angle ( sometimes called also Me- ridian Distance ) , is the angle at the pole contained between the ...
... angles round the poles , which are called , from the division of time inte hours , HOUR - ANGLES . 468. An hour - angle , or horary angle ( sometimes called also Me- ridian Distance ) , is the angle at the pole contained between the ...
Andre utgaver - Vis alle
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 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.