x24 ASTRONOMICAL AND. 
. From thefé data we may determine the angle of Mercury’ 
vifible way with the ecliptic, the geocentric latitude, and the 
time of the ecliptical conjunction. In the right-angled trian-- 
gle SMA, SM is given, and MA is known by the vifible hora- 
ry motion: of Mercury from the fun. Hence, we can find SA,, 
and the angle MSA 26° 13’ 28’’.. ESA is the angle made by 
that parallel to. the Equator which paffes through the fun’s cen-- 
ter at the ecliptical conjunction, and the ecliptic ; and is equali 
to the fun’s. declination at that time, 17? $265". Subtract. 
~ this. angle from. MSA, : ‘and. we have the angle MSE, the angle: 
of Mercury's.vifible way. withthe ecliptic,. 8? 20” 33'*- Again, 
in the right-angled triangle SME,. we have: SM, and the: angle: 
MSE’; from which we can find SE and ME. The former is: 
the, geocentric latitude, and the latter is the difference between 
the middle of the tranfit and the ecliptical: conjuri&ion. By. 
fuch.a calculation corrected by parallax, at. the ecliptical con-. 
junction: the geocentric latitude, of Mercury was: 157 56”, 8 
Ang Lene of. pence muscae Nov. ae 11* po’ s P 
fain at t . Seat din is “apple I 35 o9 in ^ 
latitude, and. L^*, 50 in longitude. 
The geocentric latitude and tlie: angle-of Mercury’s s viibi: 
way with the ecliptic being known;. we ean. alfo determine the: 
place of Mercury’s node, and the inclination: of his. oiis tibe: 
plane of the ecliptic. Af we allume: Mi 
the earth to: be 67685 3, and. | 
dis heliocentric tude a at. 
$* 365; 1 his. = hte motion in the ees di 18^^ ae 5 and 
Phe gate be 
