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IX. A Determination of the exaSl Moments 
of Time when the Planet Venus was at 
external and internal ContaSl with the 
Suns Limb) in the Iranfits of June 6 th t 
1761, and June 3 d> 1769, 
By Samuel Dunn. 
Read Feb. 22,T N the year 1761, I preferred to the 
JL Royal Society an obfervation which 1 
made of the external and internal contads of the 
planet Venus with the fun’s limb, containing feveraf 
unexpeded phenomena in thofe contads, which 
were fufficient to render them uncertain feveral 
leconds of time. In that paper I took no notice of 
.that lucid annulus which alfo appeared to me to ex- 
tend outwards from the circumference of Venus to 
the breadth of about 5 feconds of a degree, but was 
particular in defcribing a certain narrow waterilh pen- 
umbra near the limb of Venus, which feemed not 
to exceed a tenth or twelfth part of the breadth of 
the lucid annulus, becauie it appeared to me of a 
hazy and indiftind colour, and extended itfelf to- 
wards the limb of the fun as the planet approached 
it, growing more and more dark and broad, fo that 
before Venus’s real limb feemed t© be atcontad with 
the fun’s limb internally, the thread of light was 
Vol. LX. K broken. 
