## Self-instruction in the Practice and Theory of Navigation, Volume 2Macmillan and Company, Limited, 1900 - Nautical astronomy |

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### Common terms and phrases

Altitude amount angle Answer Apparent beams Bearing Blue Body called causes centre Chronometer Circle Coefficient column Compass Compass Needle compensate correction Cosec Course Declination Deviation diagram Diff difference direction Dist Distance Earth East effect equal Equation Error example feet force formula given gives Greenwich date Heeling Error Height of Eye Horizontal Hour Angle interval iron Latitude less Long Longitude Magnetism Mean Mean Sun Meridian miles minutes Moon Moon's namely noon North observation plane points Polar Pole position problem Quadrantal Reduction Required right angles Right Ascension Sailing semi-circle Ship Ship's Ship’s Head side Sidereal sight South star Sub-permanent Magnetism Suppose Table tack taken triangle True Variation Vers Vertex Vertical West Westerly wind

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Page 257 - Wind velocity 0 1 2 3 4 5 6 7 8 9 10 11 12 calm light air light breeze gentle breeze moderate breeze fresh breeze strong breeze moderate gale fresh gale strong gale whole gale storm hurricane...

Page 263 - ... 4. What are the usual indications of a ship being on the line of progression of the centre of a cyclone ? 5. What are the usual indications that a ship is (a) approaching the centre of a cyclone ; (6) receding from it ? 6.

Page 263 - The direction of the wind in a cyclone being , state the probable bearing of its centre from the ship in the Hemisphere. 2. And suppose that the wind during the passage of the same cyclone were found to change...

Page 269 - ... cos a = cos b cos с + sin b sin с cos A ; (2) cos b = cos a cos с + sin a sin с cos в ; ^ A. (3) cos с = cos a cos b + sin a sin b cos C.

Page 178 - The sine of the middle part equals the product of the tangents of the adjacent parts. (2) The sine of the middle part equals the product of the cosines of the opposite parts.

Page 263 - Cyclone being* , state the probable bearing of its centre from the ship in the * Hemisphere. 2. And suppose that the wind during the passage of the same cyclone were found to change toward the...

Page 311 - E. : required the deviation of the compass for the position of the ship's head when the observation was taken. 9. 1881, May 27th, AM at ship, latitude 55° N., observed altitude sun's LL 43° 9...

Page 265 - Under what conditions would the change in the direction of the wind in the cyclone be the reverse of the above ? 4.

Page 49 - N. latitudes against the course of the sun, that is to say, from right to left, or in a direction contrary to the movement of the hands of a watch, and in S.

Page 257 - ... in the air. If the air is saturated with moisture, there will be little or no difference in the readings of the two thermometers, because there will be little or no evaporation.