C 183 ] 
XXIV. Venus ohferved upo?i the Sun at Ox- 
ford, June 3, 1769 : By Samuel Hor%, 
L/L»B, BeSlov oj St. Mary, Newington 
Surrey, F.R.S» ’ 
ReadJ^une 15, y|r y regulator was moved to the 
IV J. place of obfervation on Wednefday 
evening, and fet a going on Thurlday ; and, between 
that time and nine o’clock on Sunday morning, 
many comparifons were made of it with Mr. Hornf^ 
by’s obfervatory clock, by which its rate of going and 
difference from Mr. Hornfby’s clock, at the time of 
obfervation, were pretty well determined. At 10' 
before feven, by my regulator, I began to obferve and 
to count the feconds, and about 3' and 3 or 4^^ after 
feven, I deferied a very fmall black notch on that part 
of the Sun’s limb where I expedted the Planet; but it 
was then fo fmall, that I was in doubt whether it 
was any thing more than an appearance occafioned 
by the horizontal vapours, which were more copious 
than I could have wifhed, and made the Sun’s edc^e, 
as uiual, appear ragged in many parts. But by%' 
after feven, this notch was grown fo large, that no 
doubt remained with me that it was the Planet. 
This was my obfervation of the external contad 
which 1 write, however, chiefly by recolledion ; for* 
having had no experience of this obfervation before* 
not 
