NavigationW. & R. Chambers, 1867 - 458 páginas |
Dentro del libro
Resultados 1-5 de 50
Página 69
... Greenwich is by the British esteemed the first meridian . In other countries , the first meridian is usually that which passes through the principal observatory or chief city of that country . 153. The LONGITUDE of any place is that ...
... Greenwich is by the British esteemed the first meridian . In other countries , the first meridian is usually that which passes through the principal observatory or chief city of that country . 153. The LONGITUDE of any place is that ...
Página 221
... Greenwich ; that is to say , when it is apparent noon at Greenwich , on any day of the year , the almanac shews the time to be added or subtracted to obtain the corresponding mean time at that meridian . PREPARATORY PROBLEM S. Problem I ...
... Greenwich ; that is to say , when it is apparent noon at Greenwich , on any day of the year , the almanac shews the time to be added or subtracted to obtain the corresponding mean time at that meridian . PREPARATORY PROBLEM S. Problem I ...
Página 224
... Greenwich time expressed astronomically . RULE . Reduce the longitude into time ( Art . 299 ) ; and if west , add it to the astronomical time at the given place , but subtract it if east ; and the sum , or the remainder , will be the ...
... Greenwich time expressed astronomically . RULE . Reduce the longitude into time ( Art . 299 ) ; and if west , add it to the astronomical time at the given place , but subtract it if east ; and the sum , or the remainder , will be the ...
Página 225
... Greenwich . Astronomical time , March 14 , Longitude in time , W. , 21 h . 7 m . 12 S. + 2 h . 19 m . Astronomical time at Greenwich , March 14 , 23 h . 26 m . 12 s . Example II . In longitude 87 ° 13 ' E. , on September 24 , at 3 h . 7 ...
... Greenwich . Astronomical time , March 14 , Longitude in time , W. , 21 h . 7 m . 12 S. + 2 h . 19 m . Astronomical time at Greenwich , March 14 , 23 h . 26 m . 12 s . Example II . In longitude 87 ° 13 ' E. , on September 24 , at 3 h . 7 ...
Página 226
... Greenwich , and the daily change of declination or right ascension ; then , as 24 h . : the time past the previous noon at Greenwich :: the daily change : the correc- tion to be applied to the declination or right ascension at the ...
... Greenwich , and the daily change of declination or right ascension ; then , as 24 h . : the time past the previous noon at Greenwich :: the daily change : the correc- tion to be applied to the declination or right ascension at the ...
Otras ediciones - Ver todas
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...