NO. 



6.] 



OBSERVATIONS TAKEN AT THE WINTER HUT. 



127 



"Horns of the Moon indistinct in the telescope, observations therefore less accurate." 



The last four observations give x + y = + 1'.4 and x y = 0'.5. 



The mean result is 81 10 '.6 or, with omission of the first, 81 11'. If the longitude 

 following from the lunar distances below be used, which would give Greenwich Time 5 minutes 

 greater than that used above, the change in the Moon's coordinates would give the latitude 0'.8 

 smaller. 



Lunar Distances. Sun and Moon, inner limbs. Ind. corn + 5'.4. 



Watch I 



h m s 



5 31 10 pm 



5 53 40 " 



6 26 " 



" 



Distance 



36 



The mean is 4h 29 m 44 s , which, with the correction to local time found above, 53 m 35 3 , 

 gives the East Longitude 3 h 36 m 9 s = 54 2', but this result is rather uncertain, as will be seen 

 from the numbers in the last column. In order to get the longitude assumed above, it must 

 however be supposed that all the distances have been measured too small. 



Magnetic Declination. 

 Watch I 



h m 



7 51 



59 



50 pm 

 16 



Sun Centre 



"Needle very unsteady." 



If the declination had been constant during the observations, the decreasing numbers on 

 the compass would show that the angle between the north end of the needle and the Sun's 

 vertical plane had been less than 90, which would give the declination 12.0 E and 13.2 E 

 respectively (see explanation p. 70). But it is apparent, from a computation made by the observer, 

 that the reading on the compass has been on the other side of 90, which gives the values in 

 the last column. The result is at all events uncertain, owing to the unsteadiness of the needle. 



1896, April 27. Circum-meridian altitudes of the Sun. Bar. 758.5 mm, Temp. - 13.8 C. 



Assumed Hor. Point 89 53', including the correction to the Sun's semidiameter, which is 

 eliminated from the mean result. Watch assumed 52 m s in advance of apparent time (deduced 

 from the preceding and the following determination of local time). 



