I 3 S 9 ] 
XXL Obfervation of the late Tranjtt of Mercury over the Sun* 
obferved by Edward Pigott, Efq . at Louvain in the Nether- 
lands ; communicated by him in a Letter to Nevil Mafkelyne, 
D. D. F. R, S. and Ajlronomer Royal . 
Read June 15, 1786. 
SIR, Louvain, May 27, 1786, 
W E have been fortunate here in feeing Mercury’s egrefs* 
I obferved it thus : 
Apparent time, May 3. 
H. M. S. 
20 45 25 Mercury’s limb in contad with the fun’s limbi 
uncertain, 
2° 45 37 ditto ditto ; certain. 
20 47 17 Mercury bifeded by the lun’s limb, 
o r Mercury quite out; clouds for a fhort interval* 
49 2 q which renders the obfervation rather doubtful. 
Though the air was not perfedly free from thin clouds* 
neverthelefs the limbs were well defined. At 20 h. 45' 
when I firlt judged Mercury’s limb in contad with the fun’s, 
his form, I think, became rather oval. Thefe obfervations 
were made with Ramsden’s two-feet achromatic, magnifying 
about 70 times. The above times difagreeing fo confiderably 
with the tables will, I imagine, not a little furprife M. de 
LA LANPE* 
I remain* Sir, with great regard. See. 
EDW. PIGOTT* 
Eee 2 
