MO Astronomical and Nautical Collections. 



In this example the azimuth at the greater altitude is greater than 

 the other azimuth ; therefore the fourth arc is equal to the difference 

 of the second and third arcs, by Rule IT. 



From a review of these Rules and Examples it may, perhaps, be 

 said that the direct method of finding the latitude by two altitudes 

 of the same heavenly body, and the time between the observations, 

 frequently considered useless to seamen, from, the length of the 

 operation, or from the difficulty of distinguishing the cases, is, when 

 thus stated, but little more troublesome than the indirect method of 

 Douwes ; for one operation will always give the latitude. And 

 with respect to the cases, when the latitude and declination are of 

 different names, they require no distinction ; and the nature of the 

 others is known at once from the azimuths, which it is necessary to 

 observe with no greater accuracy than to determine whether one of 

 them be greater than the other, or whether their sum be greater 

 or less than 180. 



