XX GEELMUYDEN. ASTRONOMICAL OBSERVATIONS. [NORW. POL. EXP. 



to determine the Greenwich Time. It was necessary to utilise them all, not 

 only for the sake of longitude, but also to get a sufficiently accurate deter- 

 mination of the rate of the chronometers which were used for the pendulum 

 observations with the Sterneck-apparatus. The ordinary determinations of local 

 time are quite useless for this purpose, because the ship was continually drif- 

 ting and even a small drift east or west will have a considerable influence 

 on the Local Time in these high latitudes. 



The observations for the determination of Greenwich Time were, however, 

 very different in point of accuracy. They shall now be considered. 



Solar Eclipses. 



1894 April 5 (April 6 on board). The greatest phase of this eclipse, 

 which took place about 2 o'clock in the afternoon, was 0'58. The same 

 evening, about 11 o'clock, altitudes of Cassiopeia? and y Draconis gave the 

 latitude 80 13' 5" and the error of Htv 8 h 18 m 9 s slow on Local M. T. As 

 Mr. Scott-Hansen had made an approximate calculation of the moments of 

 contact, 3 observers were ready with the telescope of Negretti and Zambra 

 and the altazimuth, viz. NANSEN, SCOTT-HANSEN and JOHANSEN. As they were 

 of course on the look-out in good time before the calculated time of 1 st con- 

 tact they shifted positions ; at the time of observation Nansen happened to be 

 at the clock, Scott-Hansen at the telescope and Johansen at the altazimuth. 

 At first contact both observers called out at the same moment, which was 

 (reduced to Hw) 



April 5, 16 h 35 m 43 s . 



As nothing is to be seen at the moment of geometrical contact, this is 

 of course some seconds late. At the second contact the observer at the alta- 

 zimuth called out at 



1) 18 h 31 m 25 s 



when the little notch was estimated to be of the same size as at I 8t contact. 

 Scott-Hansen noted the time as 



2) 18 h 31 m 36 s 



when the last trace vanished in the telescope. He adds the remark that the 

 image was very sharp. 



