( 23° ) 
In the Obfervatory at Tarts , Signor Maraldi ob- 
ferved the fir ft Appearance of Mercury on the Sun’s 
Limb at 2 h 50 ' T. app. and the interiour Contad 
at 2 h 51' 48 ". And Mr. de Lijle , obferving a-part, 
concluded the fame at 2 h 5 1 ' 37 // , but fufpeds it might 
have been fome few Seconds later. This Gentleman 
has communicated his Gbfervation at large, from whence 
we (hall only borrow the following obferved Lati- 
tudes. 
h 7 ff 
At 2 5 6 20 
3 00 40 
3 10 20 
3 16 12 
At Bononia , in Italy , Signor Manfredt obferved 
Mercury indenting the Sun s Limb at 3 11 26' 22"} 
and that he was gotten entirely within, at 3 h 27' 45". 
And thefe are the Obfervations mod to be depended on, 
that we have receiv’d from abroad. 
In order to deduce from this Thanotnenon , fo accu- 
rately obferv’d, what may contribute to the Perfedioriing 
of the Theory of Mercury's Motion, which (as appears 
by the near Agreement of our Numbers with this and 
many other Obfervations of him) feemsto need but very 
little Corredion ; l carefully computed, from our Tables, 
the Motion of the Planet in five Hours, and found his 
apparent Motion on the Sun , to be in Longitude 29' 
21// Retrograde, and that his Latitude encreas’d nor- 
therly 4/ iyi ri in the fame time ; whence the Hora- 
ry Motion in Longitude 5' 52 and in Latitude 
and thence the Angle of the vihble Way 
with the Ecliptick 8° 19', and the Horary Motion in 
that Way 5' 56'/. Again, the Angle of the Ecliptick 
with 
/ // 
Latitudo Borea Mercurii 3 3 6 
3 42 
3 46 
3 
