f 193 ] 
to the center of the Planet : this I obferved to in- 
creafe till the time of the internal contad; which 
fully convinced me that there is an atmofphere about 
Venus. 
I had the good fortune to take feveral correfpond- 
ent altitudes of the Sun on the day of the tranfit, and 
alfo on the day before. 
The longitude of Spital Square, well of the Royal 
obfervatory, I formerly found by Rocque’s furvey, to 
be 16'''^ of time; and lately, by obferving with 
you the explolions of rockets, it was found to be 
17'V-o- I therefore add 17" to my time, to bring it 
to yours. 
I am, Sir, 
Your humble fervant, 
John Canton. 
Spital Square, June 3, 1769. 
OBSERVATIONS of the TRANSIT of VENUS. 
h / // 
I ft external contadi at 7 8 aSfl 
2 ft internal contact at 7 26 j time. 
Duration of the ingrefs 18 31 
Equation of time < 
ift external contail at 
ift internal contact at 
/ // 
2 15I add 
h / // 
7 10 apparent time. 
7 29 15?/. ^ 
r n 
The diameter of the Sun, from 3 obfervations, was 
of Venus, from 4 obfervations, 
At 7’’ 38' 31'% apparent time, the right afcenlion of J 
greater than that of the Q by 8' 7". 
VoL, UX. Co 
31 35 l 
59 
was 
Op 
