1 287 ] 
ifame day at 1 1 In the afternoon, meafured between 
two parallels of declination, 2041. 
The latitude I have not yet got fo corredtiy as I ex- 
pe( 5 t to do; but I do not at prefent know, whether it 
exceeds or falls fliort of 53° 48^ The fuppofed lon- 
gitude is 6' of time weft of Greenwich ; this is de- 
duced from its pofition with Wakefield, w'hofe lon- 
gitude is fet down in Maflcelyne’s Britifh Mariner’s 
Guide, as determined from an obfervation of the 
tranft of Venus, 1761. 
The exadl knowledge at what point of the Sun’s 
circumference to look for the beginning (which was 
communicated to me by Mr. Mafkelyne), I found of 
great ufej infomuch that, I believe, I faw the firft 
^difcernible impreflion ; I have, however, allowed 2" 
for the time elapfed between the firft perception, and 
the being fure it was the approach of the Moon that 
affedted that part of the Sun’s limb j and which latter 
only could be noted by the clock. The firft ap- 
proach did not, however, affedl the Sun’s circum- 
ference by any thing like a penumbra or fhade; but 
began by fome afperities of the Moon’s limb, feeming 
to thruft themfelves into that of the Sun ; and which 
appeared before any continued part of the Sun’s cir- 
cumference was cut off j or, perhaps, it might be oc- 
cafioned by the firft approach of the Moon’s limb, 
difturbing the little protuberances upon the Sun’s cir- 
cumference, occafioned by the undulation of the air; 
and which, when rendered exceedingly diftindf, ap- 
peared almoft like the teeth of a fine faw. This 
whole appearance, to a telefcope lefs diftindf, would 
probably look like a penumbra or fliadow, 
VoL. LIX. O o 4 
Some 
