. A new treatise on the practice of navigation at sea : containing all the details necessary to enable the mariner to become a good practical navigator. . 44 18t Alt Obs. (and decreasing) was 50 41 1 st A It (increasing) was 40 48 Suns Alt at the Mean of the Times 49° 17 Moons Alt at the Mean of the Times 41* 82 Hence we have tbe following Observation • M . .87* 4« 30* iei4 NAUTICAL ASTRONOMY. TO FIND THE APPARENT ALTITUDES OF THE BODIES AND THEIR APPARENT DISTANCE. • Add 12 to the Observed Altitude of the Sun and Moon, and add their Semidiameter to the Observed Distanott Bons Oba. Alt .49° 17
. A new treatise on the practice of navigation at sea : containing all the details necessary to enable the mariner to become a good practical navigator. . 44 18t Alt Obs. (and decreasing) was 50 41 1 st A It (increasing) was 40 48 Suns Alt at the Mean of the Times 49° 17 Moons Alt at the Mean of the Times 41* 82 Hence we have tbe following Observation • M . .87* 4« 30* iei4 NAUTICAL ASTRONOMY. TO FIND THE APPARENT ALTITUDES OF THE BODIES AND THEIR APPARENT DISTANCE. • Add 12 to the Observed Altitude of the Sun and Moon, and add their Semidiameter to the Observed Distanott Bons Oba. Alt .49° 17 Moons Obs. Alt, L. 32 Obs. Distance of Sun and Moon 87* 42 20 12^ 12 Suns Ds Aug. Semi 16 81 9 Buns App. Alt. .49 29 Moons App. Alt ... AVii Apparent Central Distance 88 13 29 June 8d, 1854. At 2h 68m P. M, Latitude in 30 North, Longitude, Dead Reckoning, 70* W, the Suns Deolin»>lion 22* 21 North, the Moons Decimation 12° 28 N., given to Project the Figure. DIAGRAM OF A LUNAR, Drawn on the Plane of the Meridian. Fir,. In this Figure th* Sun in on the Prime Vertical, to the Westward of the Meridian, and his Hour Anglemeasured on the Equator gives the Apparent Time of the , 2h 58m P. M. The Moon havingnearly the same Hour Angle to the Eastward of the Meridian, appears to a spectator situated at a greatJistauoe to the Eastward of the Earth, (which is in the centre,) to be nearly in the same line of bearing^jut the following Figure, drawn with the objects facing the spectator, will place them in a better point ofTiew for showing the nature of the case. DIAGRAM OF A LUNAR,Drawn on the Plane of the Prime Vertical. 0 Fig. 30. 7tNITH tp L OlST ; 8 7^3^ 12
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectnavigat, bookyear1902
