MATHEMATICAL PAPERS 13 
g's parallax in longitude from 6, IÑ ext. cont. 2,224 
Ditto, 2d, nos . .1, 280 
Difference; ! "Perf ee 09, 944 
v's parallax in latitude fiia OU WS: -. "ws, BOP 
Ditto, 2d, | 010523, 169 
Difference, 0,362 
$'struemot.ono 'sdifcin 1 23 /42t reduc. ET 8“ 9, > 376 
Difference of parallaxes i in longitude, ; E ©, 944 
Length of the vif. tranfit-linereduced totheecliptic, 8 10, 320 
= 490", 32 
$'s true motion in latitude in, 1% 23? 35 1s I II, 928 
Difference of, parallaxes in latitude, - — O, 362 
Vifible motion in latitude, "ba uA E35 $06 
71", 566 
For the angle of Mercury’ S Ah way ii the fun in the 
ecliptic ; the error of the tables in latitude ; and the time 
of the ecliptic conjunction of o's and 3’s. centers, deduced 
from the times of the external contacts. 
In Plate H. Fig. IH. let EDK reprefent half of Hee fun's 
dife ; the diameter EOK a portion of the ecliptic, or rather a 
parallel to it ;* $U a parallel = 490'*, 32 Mercury's vifible 
motion upon the fun's difc, reduced to the ecliptic ;; UM Mer- 
curys vifible motion in geocentric. latitude, durin the’ time 
between the two external contacts ; confequently, MxU, the 
angle required, and-yM_ the vifible tranfit-line ; the point o - 
the fan's center, at the apparent time of the vifible conjunction 
of centers ; oN, perpendicular to M, the vifible leaft diftance 
of. centers ;. oD. PEPON to the ecliptic, the vifible di 
, , 49:. tance 
> The ditaace Tod de n c be ng ge to the fun's padri latitude. . 
