SP E. 
MATHEMATICAL PAPERS. 13% 
parallax in longitude from the fun, becaufe his vifible longitude 
was greater than the true, and the remainder, 379", 472, will 
be the true difference of longitude. 
Por the apparent time of the true ecliptic coii and 
Mercury's true latitude hy obfervation: 
Mercury? s ecliptic horary motion upon: ©’s difc 353",.52::. ah 
— 3600" :: the true difference of longitude 379", 472: 38642" E^ 
the fpace of time from the firft external contá& to the ecliptic 
conjunétion, = 1" 4' 247'' ; which, added to ro 6’ 27", 
gives i1 10* 5:2'", for the apparent time of the true ecliptic 
conjunction.. 
1nd! 4* 2455 Mercury’ s geocentric uaiu was encreafed 
557745 which, added to 1 p 2", 487, his latitude at the 
firft external contact, makes 15" 58”, 261, for Mercury's true 
latitude by obfervation, at the nme of the true-ecliptic.con- 
jun&ion; by the external contacts. | 
‘Deductions from the internal contacts. 
Let the references be to Plate n. e HI. the lines o£ 
Tor oM being fap id pofed s L6 odios f the femi- diameters 
F the fun and "Me rcu y m 967" ^ ; ; and, co fec ue pm as 
tranfit-line wholly within the fun's dife.. — — 
¥’s parallax in longitude from ©, 1ftint. cont, - ba 158: 
Ditto, es 2d, - : 1, 355 
Difference, o, 803 
?'s parallax in latitude from o, ft, - 2; 837 
Ditto, 2d, 45 
Difference, 
pe $2 
