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 i
... tude and longitude of a ship when out of sight of land . Only accepted standard methods , are included , and each method of observation is illustrated by diagrams and examples worked out to minute details . Particular attention is given ...
... tude and longitude of a ship when out of sight of land . Only accepted standard methods , are included , and each method of observation is illustrated by diagrams and examples worked out to minute details . Particular attention is given ...
Page 2
... tude ) used in navigation and surveying . 6. Gravitational astronomy , also called celestial mechanics , treats of the application of dynamic principles to account for the motions of the heavenly bodies . as 7. Physical astronomy ...
... tude ) used in navigation and surveying . 6. Gravitational astronomy , also called celestial mechanics , treats of the application of dynamic principles to account for the motions of the heavenly bodies . as 7. Physical astronomy ...
Page 8
... celestial meridians . They are to the celestial sphere what the meridians of longi- tude are to the terrestrial sphere ; in fact , the meridians of the earth extended toward the celestial sphere will mark the 8 $ 12 NAUTICAL ASTRONOMY.
... celestial meridians . They are to the celestial sphere what the meridians of longi- tude are to the terrestrial sphere ; in fact , the meridians of the earth extended toward the celestial sphere will mark the 8 $ 12 NAUTICAL ASTRONOMY.
Page 17
... tude and longitude . COMPARISON OF THE THREE SYSTEMS 51. The altitude and the azimuth of a star serve to fix its position relative to the horizon ; but owing to diurnal . motion they are constantly changing . The polar distance . and ...
... tude and longitude . COMPARISON OF THE THREE SYSTEMS 51. The altitude and the azimuth of a star serve to fix its position relative to the horizon ; but owing to diurnal . motion they are constantly changing . The polar distance . and ...
Page 57
... tude has been measured , hold the instrument as shown in Fig . 34 , and read off the measured angle according to rule , being very careful not to touch either the clamp or tangent screw before the angle is read off and noted on. § 12 57 ...
... tude has been measured , hold the instrument as shown in Fig . 34 , and read off the measured angle according to rule , being very careful not to touch either the clamp or tangent screw before the angle is read off and noted on. § 12 57 ...
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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.