Appendix B. 



Referring the observations of the 26th, 27th and 28th June to the date of 

 those of the 11th, and using the daily correction - 0*-509 we get, by applying 

 the just found mean daily correction 1*"635, the following values for the 

 longitude of Bujongolo : 



Grouping these results for each single day of observation we get : 

 Bujongolo.— 11th Jime X = 1" Sg-" 5P-5 



26th 

 27 th 

 28th 



54-9 

 53-8 

 51-5 



Disregarding further considerations as to weight, and given the degree of 

 approximation now required, the mean of these data is : 



Bujongolo \ = li^ 59" 52'-9 E.G. 



This value is used in calculating the Greenwich time at the moment of the 

 emersion of B A G 81 from the lunar disk, which phenomenon occiu'red on 

 11th July under most favourable conditions for observation. The determina- 

 tions of the horary angle, obtained for this occasion with the view of 

 ascertaining the state of the chronometer respecting the mean local time, 

 gave the following results : 



312 



