OF THE SUN WITH THAT OF THE FIXED STARS. 
27 
V. Observations of the Light of the Sun, compared with that of a Candle, 
by means of Shadows. 
Date of the Observation. 
1799. 
H 
Diameter of the 
Hole in the Shutter, 
in parts of an inch. 
D 
Distance of the Hole 
from the 
Screen in inches. 
c 
Distance of the 
Candle from the 
Screeninincheswhen 
its light is equal to 
that of 0, admitted 
through Hole. 
Numerical value of the Ex- 
pression 
r 12 x D „ _ Diam.~ I s 
LcxH X2tan0S 2 J 
End of May, 
.0067 
93 
19.5 
6152 
and 
.0072 
93 
19-0 
5611 
Beginning of June. 
.0086 
93 
18.0 
4382 
.0093 
93 
17-5 
3965 
.0093 
111.5 
20.5 
5228 
.0098 
102 
14.25 
6477 
.0098 
108 
15.4- 
6410 
.0098 
120 
17-0 
6299 
May 28 
.0098 
120 
17.5 
5944 
June 19 
.0105 
126 
15.0 
7770 
.0111 
93 
14.5 
4054 
.0118 
93 
13.0 
4463 
66755 
Hence 5563 is the number of Candles, which being placed at the distance of 
twelve inches, will give a light equal to that of the Sun. 
VI. Observations of the light of the Moon compared with that of a 
Candle, by means of Shadows. 
Distance, in inches, of the 
Date of the Observation. 
Remarks. 
Candle from a Screen, when 
its light is equal to that of ([ . 
1799, May 16 
<fs Elongation 170°§ 
144 
.... June 17 
d Full 
144 
Hence, a = ^ X Candle placed at the distance of twelve feet, 
/'144\ 2 
and O = 5563 X ( -py i Moons. 
= 80 1.072 Moons. 
