NavigationW. & R. Chambers, 1867 - 458 páginas |
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Página 228
... moon's right ascension may be found in the same way ; and the moon's semidiameter , horizontal parallax , & c . , may be reduced by the following proportion - As 12 h . : the time at Greenwich :: the change in the moon's semidiameter in ...
... moon's right ascension may be found in the same way ; and the moon's semidiameter , horizontal parallax , & c . , may be reduced by the following proportion - As 12 h . : the time at Greenwich :: the change in the moon's semidiameter in ...
Página 229
... moon's declination , right ascension , semidiameter , and horizontal parallax on the 17th November 1866 , at 11 h ... moon's declination and right ascension on the 12th November 1866 , at 9 h . 54 m . P.M. mean time , in longitude 14 ...
... moon's declination , right ascension , semidiameter , and horizontal parallax on the 17th November 1866 , at 11 h ... moon's declination and right ascension on the 12th November 1866 , at 9 h . 54 m . P.M. mean time , in longitude 14 ...
Página 230
... moon's declination and right ascension on the 28th March 1866 , at 9 h . 33 m . P.M. mean time , in longi- tude 73 ° 59 ′ W. ( 418. ) Find the moon's declination and right ascension on the 31st March 1866 , at 5 h . 43 m . A.M. mean ...
... moon's declination and right ascension on the 28th March 1866 , at 9 h . 33 m . P.M. mean time , in longi- tude 73 ° 59 ′ W. ( 418. ) Find the moon's declination and right ascension on the 31st March 1866 , at 5 h . 43 m . A.M. mean ...
Página 232
... moon's upper or lower limb , her semidiameter , and horizontal parallax , as given in the Nautical Almanac , and the latitude of the place of observation , to find the true altitude of her centre . RULE . 1. To the semidiameter from the ...
... moon's upper or lower limb , her semidiameter , and horizontal parallax , as given in the Nautical Almanac , and the latitude of the place of observation , to find the true altitude of her centre . RULE . 1. To the semidiameter from the ...
Página 233
... moon's centre . 4. Multiply the seconds in the reduced equatorial parallax by the natural cosine of the apparent altitude , and the product will be the seconds in the parallax in altitude ; from which subtract the refraction ...
... moon's centre . 4. Multiply the seconds in the reduced equatorial parallax by the natural cosine of the apparent altitude , and the product will be the seconds in the parallax in altitude ; from which subtract the refraction ...
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Términos y frases comunes
anchor apparent altitude barometer called Cape Cape Clear centre chords chronometer column common logarithms corrected cosec course and distance course steered decimal departure dept difference of latitude difference of longitude dist distance sailed divided equation Example extent will reach find the course given GUNTER'S SCALE hence horizon hypotenuse index error latitude and longitude latitude arrived leeway line of numbers logarithms mast middle latitude miles moon's multiplied Nautical Almanac observed altitude October 20 parallax parallel Parallel Sailing perpendicular place of observation plane Plane Sailing points polar distance port tack quantities quotient radius required the course required the latitude required the true right ascension rope secant semidiameter sextant ship from latitude ship sails ship's side slider starboard tack subtract sun's declination tangent true altitude true course true distance variation vessel wind
Pasajes populares
Página 395 - Nothing in these rules shall exonerate any ship, or the owner, or master, or crew thereof, from the consequences of any neglect to carry lights or signals, or of any neglect to keep a proper look.out, or of the neglect of any precaution which may be required by the ordinary practice of seamen, or by the special circumstances of the case.
Página 395 - In obeying and construing these rules due regard must be had to all dangers of navigation ; and due regard must also be had to any special circumstances which may exist in any particular case rendering a departure from the above rules necessary in order to avoid immediate danger.
Página 394 - Every steamship, when approaching another ship so as to involve risk of collision, shall slacken her speed, or if necessary stop and reverse ; and every steamship shall, when in a fog, go at a moderate speed.
Página 391 - ... abaft the beam on the starboard side, and of such a character as to be visible at a distance of at least 2 miles. (c.) On the...
Página 392 - ... use : and shall, on the approach of or to other vessels, be exhibited on their respective sides in sufficient time to prevent collision, in such manner as to make them most visible, and so that the green light shall not be seen on the port side nor the red light on the starboard side, nor, if practicable, more than two points abaft the beam on their respective sides.
Página 392 - ... so constructed as to show a clear, uniform, and unbroken light visible all around the horizon at a distance of at least one mile.
Página 392 - The said green and red side lights shall be fitted with inboard screens projecting at least three feet forward from the light, so as to prevent these lights from being seen across the bow.
Página 393 - Sailing pilot vessels shall not carry the lights required for other sailing vessels, but shall carry a white light at the masthead, visible all round the horizon, and shall also exhibit a flareup light every fifteen minutes.
Página 393 - When two steam vessels are meeting end on, or nearly end on, so as to involve risk of collision, each shall alter her course to starboard so that each may pass on the port side of the other.
Página 393 - Whenever there is a fog, whether by day or night, the fog signals described below shall be carried and used, and shall be sounded at least every five minutes, viz. : (a...