ON THE LIGHT OF THE MOON AND OF THE PLANET JUPITER. 255 
For the Moon. For Venus. For Jupiter. 
r, — 1.0000 e = -0.7238 r! = 5,2028 
A,’ = 1.0000 A, = 43098 
S MAPS vi 2 180% 
The standard phase for Venus accords nearly with the date 1860, April 1st, 23".5, 
mean solar time at Cambridge; this has been adopted on account of its lying midway 
between the dates of observation, so that errors in the assumed values of the correc- 
tions for phase, 
(30) Mie Ki 
e, ' 
which must be used to find a normal value of d, will be mostly eliminated. I have 
used 
sin. v' — v cos. v' H" sin. v — v” cos. v" 
1 DUE . 
sin, v, — v," cos. v," ? 
Bro 
P 3 
sin. v, — v,' cos. v,' 
for the reductions to the standard phases of Venus and Jupiter respectively ; the light 
of the latter being referred to its mean opposition as a standard. 
The observations upon the Moon have been referred to itè mean distance from the 
Earth, using for its mean semi-diameter, 934”.67. 
After applying all the corrections, we have the following results: — 
1860. Moon. Venus, Jupiter. 
March 24 v = 27? log. " = 7.111 ze log. is zz 64/00 v" = 180? log. " = 6.162 
25 39 qe 8.158 - S 6.713 id " 6.129 
ae 8.605 
d s | 8.594 mn 
29 e C M m oe p 
30 100 2 9.113 Eris Cess 
9.665 
April 2 142 vines 9.839 wë e 6.811 e | ei [6.573] 
5 176 " 0.029 kx ek wees 
6 162 " 0.046 EES des 
13 ene wee a " 6.793 z - 6.221 
18 ower wé e 6.872 " e 6.267 
9.910 
May 2 — 1200 9.825 
4 178 - 9.884 
25 66 . 8.731 
fe w S | en 
9.367 
June 2 174 er 0.147 i. ug ixl: 
12 & " 6.646 sro 
