NEW OBSERVATION'S OF THE PLANET MERCURY. 
457 
TABLE X. 
:0 rOLAR DIAMETER, FROM DRAWINGS AND DIFFERENCE 
OBSERVED AND THEORETIC PHASE. 
G. M. T. 
Bute. 
Sept. 
Oct 
a 
Ratio Equat. to 
Polar I)iam. 
from Drawings. 
Observed PLase 
Angle. 
Tlieoretic 
VhnBd Angle. 
Utd lUl-nrrtlc i'bfMW. 
.510 
9L6 
so! 

11.6 (?) only ono. 
.549 
84.4 
82. 
2.4 i>oor (?) only one. 
.377 
104.2 
96. 
8.2 
.299 
113.7 
107. 
C.7 
.291 
114.7 
114.3 
.4 ouly wijc 
.245 
120.7 
118. 
2.7 
.188 
129.6 
129. 
-0.4 
.183 
129.4 
127. 
2.4 
.239 
121.5 
120.1 
1.1 poor (? 
.241 
121.2 
114. 
7.2 
.250 
120.0 
108. 
12.0 
.300 
113.6 
102. 
11.6 
.445 
96.3 
81. 
* 
ir <? 1 very good, cxam- 
'''"* I incd carefully. 
.535 
8G.0 
76.1 
9.9 ouly oue. 
.532 
8G.3 
64. 
22.3 
.595 
79.0 
60. 
10.0 
.G48 
72.8 
56. 
16.8 
39. Amount of ] 
cusps is, we may be 
(Art. 35) that the differ 
Drawings 
To d 
what the absol 
the 
by considering the case of the drawings 
ence of phase loss at the centre of 
21 
of theoretic and observed dicliotomy was 11. 9 
that the limb at the equator is brightest a1 
9^9,or2^0 
There wc found 
uiiiator between 
Now Article 
of dichotomy 
Article 38 that the loss at the cusps decreases fi 
mu 
the 
supe 
Both of these factors affect the pha.sc deduced from 
but only th 
affe 
hown by 
( 
'o 
th 
