[ 319 ] 
true time, and with regard to the time of the exter- 
nal contadl exprefles himfelf thus “ a o h 53' 18" le 
foleil a paru pendant 3 ou 4 fecondes. Je n’ai pas 
vu le difque du foleil bien ferme, il me paroiffoit un 
peu altere au lieu de la fortie de Venus. M. Thu- 
illier ne voyoit rien avec la Lunette de 9 peids. J’ai 
de la peine a me perfuader que Venus foit fortie 
plutot.” It is plain from thefe words that M. Pingre 
believed that the external contadl did not happen be- 
fore o h 53' 1 S''. This being allowed, let us com- 
pute the duration of the egrefs at Rodrigues, which 
we fhall find — 17' 55 // . It follows, therefore, that 
the internal contact happened at o h 35' 23". But 
this fuppofes that the obferver could fee the very laft 
contact of Venus with the Sun’s limb, the contrary 
of which I have fhewn in a former paper on this 
fubjedt We are therefore certain that the externa! 
contadt happened later than o h 53' 18", by feveral 
feconds, confequently the internal contadt happened 
later than o h 35' 23" by feveral feconds. Upon the 
whole, therefore, we may fafely conclude that there 
is a miftake of one minute in fetting down the time 
of the internal contadt at the egrefs at Rodrigues, and 
that, inftead of o h 34' 47", it fliould be o h 35' 47". 
This fort of miftake has happened feveral times in the 
obfervations of this tranftt, but they are eafily difco- 
vered. 
I fhall now proceed to compare the obfervation oi 
the internal contadt at the Cape, with the obfervation 
of the fame contadl at Rodrigues and at 20 places to 
the north of the Line, and alfo the obfervation at 
Rodrigues with the fame 20 places, and they are as 
follow. 
9 39 
T t 2 
