46 H. MOHN. M.-N. KI. 



The longitudes of the stations between lat. 88" 30' and 89° 54' have 

 been computed from the general course 3^49' and the colatitudes i°3o' 

 and those of the stations. The true course may be convex towards E and 

 give rather smaller longitudes, but the error is of no real significance. 

 Having found his latitude and the bearings of the Pole from his observa- 

 tions on the 16^^' December, Capt. Amundsen, on the 17"^, shaped his 

 course as nearly as possible towards the Pole, NW |- W b. C, and stopped 

 when the sledge meter showed a distance of 5.5 miles. During a 

 period of 24 hours, from December 17*^'* 11'' 30'" a. m. to December 18*'' 

 noon, sextant observations of the altitude of the Sun were taken every 

 hour at the Pole station. The result of the computation made by Mr. Alex- 

 ander^ was Latitude 89" 58'. 5 and Longitude between 30° and 75°. E. 



The sextant-observations made by Capt. Amundsen and his men on the 

 16*^^ and the 17*^ December are given in full in the Appendix. 



In order to find the most probable values of the latitudes and longi- 

 tudes on these days, I have made the following computations. 



At latitude 89° 54' the altitude of the Sun increases i' in 38°^ in the 

 first vertical, and in latitude 89° 58^.4 it increases i' in 2^' 22"^ The ac- 

 curacy of the observed altitudes being scarcely less than ± 1' they are 

 not capable of affording an exact value of the hour. 



The facts regarding the value of the altitudes themselves are better. 



On the 17*^, from ii'^-3o™ a.m. to noon on the 18"^^ Framheim 

 Time, 4 observers took 26 double altitudes of the lower limb of the Sun 

 with Sextant No. i. These observations include the upper culmination 

 (some hours before midnight) and the lower culmination (at about 9^ a. m 

 on the 1 8th. Fr. T.) 



With the index error — i', Refraction i' 52" the Sun's semidia- 

 meter 16' 17" (N. A.), Sun's parallax 8", we have 



Latitude 89" 60'. 7 89*^ 56'.o 



The Mean is 89058^.4, and the altitudes require a correction of + 2'.3. 



^ The South Pole, II. p. 402. 



