318 Dr Pearson, On observations of the Transit [Jan. 29, 



where log a t = 2-54474, log \ = 2-48082, c, = 273° 53' 4", 



and consequently (\ + cj = 194° 4G' 6". 



Consequently : 



2-480820 

 2-544740 L cos <f>'= 9-978388 



L sin £' = 9-488255 L cos (X + cj = 9'985428 n. 

 2032995 2-444636 n. 



= 108 s. = 1 m. 48 s. = 278§ s. = 4 m. 38* s. 



And so we have 



h. m. s. 



2 4 21 

 1 48 

 4 38* 



2 10 47i 



5 16 29i w. Loner. 



8 54 18 L. M. T. as the moment of first contact. 



As I have said at the beginning, the first contact" was not 

 observed by me, but I have no doubt that it occurred later than 

 this, and probably later than the time deduced from the Nautical 

 Almanac. The subjoined Table gives the times of the four 

 contacts, as computed in London and at Paris, and as observed by 

 myself* 



I also took five micrometrical measures of the distance between 

 the limbs of the Sun and the planet: but my micrometer is new, 

 and not having ascertained the exact value of its divisions at 

 present, I will defer giving my results in this communication. An 

 approximate estimate of the diameter given by Venus when well 

 advanced on the Sun's surface makes it to have been 63 "4", that 

 given in the Conn, des Temps for that day being 62 - 8". 

 * /See note on page 314. 



