NavigationW. & R. Chambers, 1867 - 458 sider |
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Side 231
... limb was observed . 5. If the observed altitude be that of a star , the corrections for parallax and semidiameter ... limb , and , the sun's upper limb ; also , N.A. means the Nautical Almanac ; A.T. means astronomical time ; G.T. means ...
... limb was observed . 5. If the observed altitude be that of a star , the corrections for parallax and semidiameter ... limb , and , the sun's upper limb ; also , N.A. means the Nautical Almanac ; A.T. means astronomical time ; G.T. means ...
Side 232
... 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 Nautical Almanac ...
... 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 Nautical Almanac ...
Side 233
... limb was observed ; and the sum or remainder will be the apparent altitude of the 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 ...
... limb was observed ; and the sum or remainder will be the apparent altitude of the 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 ...
Side 233
... May 11 , " * 65 ° 12 20 Problem V 14 # 19m 3ra From the observed altitude lower limb , her semidiameter , and l in the Nautical Almanac , observation , to find the tru • Problem IX . d the polar distance of a. 232 Treatise on Navigation .
... May 11 , " * 65 ° 12 20 Problem V 14 # 19m 3ra From the observed altitude lower limb , her semidiameter , and l in the Nautical Almanac , observation , to find the tru • Problem IX . d the polar distance of a. 232 Treatise on Navigation .
Side 238
... co - dec . Example I. On March 30 , 1866 , in longitude 65 ° 17 ′ W. , the observed meridian altitude of the sun's lower limb was 57 ° 13 ′ 20 ′′ , the zenith being north of the sun ; the index error 238 Treatise on Navigation .
... co - dec . Example I. On March 30 , 1866 , in longitude 65 ° 17 ′ W. , the observed meridian altitude of the sun's lower limb was 57 ° 13 ′ 20 ′′ , the zenith being north of the sun ; the index error 238 Treatise on Navigation .
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Vanlige uttrykk og setninger
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
Populære avsnitt
Side 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.
Side 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.
Side 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.
Side 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...
Side 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.
Side 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.
Side 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.
Side 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.
Side 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.
Side 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...