Appendix B. 
Hence the same Prof. Millosevich advised us to assume with full confidence 
the corrections for the lunar co-ordinates received from Greenwich, and these 
yielded the longitude for Bujongolo : 
\ = 2 h 0 m 6 S, 3 E.G. 
This again agrees closely with the value 2 h 0 m 6 s- 0 East Greenwich, 
obtained by Prof. Millosevich, who was also good enough to make the same 
calculation. 
The latitude was obtained from two meridian altitudes and from two series 
of circummeridians (Obs. Xos. 38, 43, 44, 46, and 49 to 54), observed partly 
by H.B.H. and partly by Commander Cagni. Between the results of the two 
observers there occurs a considerable difference, the origin of which may be 
attributed to some anomaly of refraction. In fact, H.R.H. was in this instance 
induced to depart from his practice of observing the lower limb of the sun, 
owing to an unusual optic phenomenon which caused him to notice on the lower 
edge of the reflected image a false limb which would not have allowed a good 
observation. Hence the discrepancy in the results is to be attributed to this 
particular state of the atmosphere. Therefore, in order to prevent the 
observations of H.R.II., which were the more numerous, from too greatly 
influencing the results, the mean of the circummeridian series was first 
obtained, and the resulting value taken as a mean with the results of the 
meridian observations. The several values thus obtained are : 
17th June. —Meridian — Commander Cagni 0 = 0 19' 50" N. 
9 th July.— ,, —-H.R.H. ,, = 0 20 55 ,, 
10th ,, —Circummerid.— Commander Cagni ,, = 0 19 52 „ 
11th ,, —Meridian —H.R.H. ,> = 0 20 54 ,, 
These data yielded for 
Bujongolo ... ... 0 = 0° 20'23" N. 
With the longitude of Bujongolo is obtained the absolute correction of 
the chronometer for the period of arrival at that encampment, and subsequently 
the mean daily correction of the same chronometer for the period occupied by 
the journey. 
Thus was obtained: 
Bujongolo.—19th June, 3 h 45 m ... C, m = + 5 h 15 m 37 S T 
,, „ ,, ... X = + 2 0 6 ~ 3 
Ki=+3 15 30 - 8 
This absolute correction on mean Greenwich time corresponds with the 
date of 11th June at 3 n 45 m of mean local time. And as at Entebbe on 
11th May, at 23 h 31 m of mean local time, we had Kj = 3 h 16 m 34 s ‘ 9, we shall 
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