Royal Society. 
^5 
the preceeding year be biffextile, add 25 h. 17 m. And in all 
thefe appulfes of Venus to the fun in the month of November^ the 
angle of the vifible way of Vemis with the ecliptic is 9° 5', and 
her horary motion within the fun 4' 7'' ; and fince the lemidia- 
meter of the fun is 16' zi'^t the greateft duration of the tranfit of 
the centre o^Penusis 7 h. 55 m. Again, let the fun and Fenus 
be in conjunction at the defcending node in the month of May , 
and according to the fame numbers the fame intervals are com- 
puted: After 8 years, 2d. ^h. 55 m. are to be fubftrafted, 
and Ferns will pafs 19' 58'' more northerly : After 255 years add 
2d. 8 h. 18 m. or if the former year have been biflcxtiJe 3 d. 
8 h. 18 m. and you fliall have Fenus pals 9' nif more louther- 
ly: Laltly, after 243 years add o d. i h. 23 m. or if the former 
year have been biflextile, id. i h. 23 m. and Fefws is again 
found in conjun61ion with the fun, but in a path 10' 57''' more 
northerly : In all the tranfits at this node, the angle of the vifible 
way oi Venus with the ecliptic is S'' 28'^ and her horary motion 
4' go'/, and the femidiameter of the fun fubtending 15' 51//, the 
greateft duration of the tranfit of the centre is 7 h. 5<J m. precifely 
the fame as at the other node : As to the Epochde^ it is concluded 
from the ingrefs of Venus into the fetting fun, and which was 
only oblerved by Horror, that Venus was in conjunction with the 
fun at London 1539, November^ 24 d. 6h. 37 m. but that fhe 
advanced 8' $0'/ towards the fouih : But in the month of Jf^^^, 
Venus has not hitherto been feen by any mortal within the fun • 
but from Mr. Halky's calculations it appears, that P'enus for the 
next time will enter the fun i7<>i, May, z^d. 17 h. 55 m.viz. 
in the middle of an eclipfe, and then be diftant from his centre 
towards the fouth 4' 15^' : Hence, and from the premifcd revolu- 
tions, all the phenomena of this kind are eafily computed for a 
thoufand years, as appears from the following table • 
No VE MB E R. 
iear 
lime of Conjunct. 
Dill, from the i) 
un's Centre 
d. 
h. m. 
' If 
918 
20 
21 55 
6 12 
N. 
1161 
20 
21 10 
<^ 55 
S. 
1396 
27 
7 20 
4 5^ 
N. 
16^1 
26 
17 29 
15^ 11 
N. 
1^39 
24 
6 37 
8 30 
S. 
1874 
16 
16 4(J 
3 5 
N. 
2109 
29 
2 5^ 
14 0^ 
N. 
2117 
26 
16 ; 
10 5 
S. 
iVl A Y- 
