International Library of Technology: A Series of Textbooks for Persons Engaged in the Engineering Professions and Trades, Or for Those who Desire Information Concerning Them, Volume 29, Part 2International Textbook Company, 1909 |
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Page 10
... instant , it is evident that by comparing these times he is at once enabled to ascertain the longitude of his ship . The question that naturally arises then is this : How may one find his local time ... observation of celestial bodies ...
... instant , it is evident that by comparing these times he is at once enabled to ascertain the longitude of his ship . The question that naturally arises then is this : How may one find his local time ... observation of celestial bodies ...
Page 26
... instant of observation being found , the various elements taken from the Nautical Almanac must be corrected for the interval of time that has elapsed between the time of observation and the time for which they are given . Usually , the ...
... instant of observation being found , the various elements taken from the Nautical Almanac must be corrected for the interval of time that has elapsed between the time of observation and the time for which they are given . Usually , the ...
Page 28
... time , the reading of the chronometer at the instant of observation should be noted and the Greenwich date found according to Art . 48 . EXAMPLE . - Find the sun's declination on June 19 , 1899 , at 11 A. M. , local mean time in ...
... time , the reading of the chronometer at the instant of observation should be noted and the Greenwich date found according to Art . 48 . EXAMPLE . - Find the sun's declination on June 19 , 1899 , at 11 A. M. , local mean time in ...
Page 36
... time April 10 , 1899 , is 8h 24m P. M. Longitude 94 ° 30 ′ W. Find the right ascension and the declination = of the planet Mars at that instant . SOLUTION.- - L. M. T. , Apr. 10 = Long . ( W ) in time 8h 24m P. M. = + 6h 18m G. D. , Apr ...
... time April 10 , 1899 , is 8h 24m P. M. Longitude 94 ° 30 ′ W. Find the right ascension and the declination = of the planet Mars at that instant . SOLUTION.- - L. M. T. , Apr. 10 = Long . ( W ) in time 8h 24m P. M. = + 6h 18m G. D. , Apr ...
Page 1
... observations is the sun , which is on the meridian of the ship at apparent noon each day . Hence , when the weather permits , the oppor- tunity of measuring the sun's altitude at that instant should . never be disregarded at sea . A ...
... observations is the sun , which is on the meridian of the ship at apparent noon each day . Hence , when the weather permits , the oppor- tunity of measuring the sun's altitude at that instant should . never be disregarded at sea . A ...
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Common terms and phrases
apparent noon applied astronomy azimuth bearing celestial body celestial equator celestial pole celestial sphere Change in 1h chronometer indicated circle compass Corr corresponding daily rate dead reckoning Decl Diff earth ecliptic equinox error on Greenwich EXAMPLE 1.-On feet Find the latitude given Greenwich date Greenwich mean Height of eye Hence horizontal parallax hour angle Index error instant of observation instrument interval June latitude local mean mean noon mean sun meridian passage method minutes moon moon's motion Nautical Almanac navigator observed altitude observed body observed meridian altitude observer facing south orbit parallax planet polar distance pole star position prime vertical right ascension semi-diameter sextant ship in longitude ship's sidereal sidereal day signals solar SOLUTION star's subtracted Sumner line sun's lower limb Thur tion transit true altitude true azimuth tude vessel wind zenith distance
Popular passages
Page 10 - In obeying and construing these rules due regard shall be had to all dangers of navigation and collision, and to any special circumstances which may render a departure from the above rules necessary in order to avoid immediate danger.
Page 10 - In every case of collision between two vessels, it shall be the duty of the master or person in charge of each vessel, if and so far as he can do so without serious danger to his own vessel, crew, and passengers...
Page 6 - ... 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...
Page 2 - ... points abaft the beam on the starboard side, and of such a character as to be visible...
Page 2 - On the starboard side a green light so constructed as to show an unbroken light over an arc of the horizon of...
Page 2 - ... if the length of the tow measuring from the stern of the towing vessel to the stern of the last vessel towed exceeds 600 feet...
Page 10 - When both are running free, with the wind on the same side, the vessel which is to windward shall keep out of the way of the vessel which is to leeward. (e) A vessel which has the wind aft shall keep out of the way of the other vessel.
Page 10 - Every vessel shall, in a fog, mist, falling snow, or heavy rain-storms, go at a moderate speed, having careful regard to the existing circumstances and conditions. A steam vessel hearing, apparently forward of her beam, the fog-signal of a vessel the position of which is not ascertained, shall, so far as the circumstances of the case admit, stop her engines, and then navigate with caution until danger of collision is over.
Page 10 - 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.
Page 10 - Risk of collision can, when circumstances permit, be ascertained by carefully watching the compass bearing of an approaching vessel. If the bearing does not appreciably change, such risk should be deemed to exist.