[ 57 6 3 
fhall fet down only Two more, which were made 
about the Middle between thefe Two 5 and were 
made by the Sun’s upper Limb. 
h. 
/ 
• 
n 
• 
The Sun at the Vertical . . 6. 
' 6. 
5 6. 
Mercury at the Vertical . . 
7- 
8. 
Mercury at the Horizontal 
8. 
42. 
The Sun at the Horizontal . 
9- 
45 . 
K 
/ 
• 
// 
• 
The Sun at the Vertical . i 6, 
17 . 
I 8. 
Mercury at the Vertical . 
17- 
29. 
Mercury at the Horizontal . 
18. 
2 6. 
The Sun at the Horizontal . 
19 . 
32. 
At the former of thefe Obfervations. 
, viz. 
6\ 7', 
8", I computed the Longitude of Mercury to be in 
1 2°, 42^ 1 7" tf, which being taken from the Sun’s 
Place in 12 0 , 43'’, 35" leaves i', 18" for the Dif- 
ference of Longitude between the Sun and Mercury ; 
and his Latitude was then 14', 4 7". At the latter 
Obfervation, the Difference of Longitude was i', $$", 
and the Latitude of Mercury 14', 42". 
From thefe Places of Mercury it appears, that his 
horary Motion in Longitude from the Sun was now 
3', 5 8 /x 5 according to which, if we fuppofe the cen- 
tral Ingrefs to have been at 4^, 57', we fhall find the 
Difference of Longitude at that time 3', 20" 5 and 
the Semidiameter of the Sun being 15', 57", the Lati- 
tude of Mercury muft be 15', 36". Now the Angle 
of Mercury's vifible Way with the Ecliptic being, by 
the Theory of his Motion, io°, 23', we muft con- 
clude the former of the obferved Latitudes about 4" 
too fmall, and the latter as much too large 5 an 
Error very inconfiderable in this kind of Obferva- 
tions. 
