C 575 3 
fuppofe, to give a Detail of all the Obfervations I made > 
I fhall therefore felcft Two or Three, which I look 
upon as moft exadfc, and mod fuitable to my prefcnt 
Purpofe. One was as follows : 
h « • 
The Sun at the Horizontal . 5 * 37 * 5 9 - 
The Sun at the Vertical . . . 3 9 * I; 
Mercury at the Vertical . . . 3 9 - l6 ‘ 
Mercury at the Horizontal . 40. 1 • 
This Obfervation gave me the Azimuth and Alti- 
tude of Mercury at his Paffage by the vertical Hair ; 
from whence I computed his Right Afcenfion and 
Declination, and from thence his Longitude and 
Latitude. The Method of obtaining which be- 
ing fufficiently known, I fhall fay nothing upon it, 
but only mention the Refult of the Numbers, which 
was, that at 5 h , 3 9', ns", when Mercury palled the 
Vertical, his Longitude was 12°, 43b $"} anc * 
the Sun being then in 12 0 , 42', 2 y" of that Sign, 
Mercury was, in confequence of the Suns Centie, 
38", his Latitude at the fame time being 15', 2" 
North. Another Obfervation was thus : 
h f " 
• • • 
The Sun at the Horizontal . 6 . 47. 37 - 
The Sun at the Vertical . . 4 8 * l 7 • 
Mercury at the Vertical . . 4 8 * 2 5 » 
Mercury at the Horizontal . 49 - 2 4 - 
Prom hence I concluded, that at 6 a , 48 ,25 , Mer- 
cury was in Antecedence of the Sun 3', 57 " > with 14', 
20" North Latitude. 1 made another Obfervation 
after this; but the Sun being then very near the Ho- 
rizon, his Limbs were not well defined, fo that I look 
upon this Obfervation as much preferable to that. I 
Ffffa fhall 
