on Horizontal Refractions. 
4 1 
EXAMPLE. 
The sun’s declination 4 0 32' 30" north, and its semidiameter 
15' 58" took the following observation : 
The meridian distance of the 
sun’s nearest limb from the 
horizon of the sea 
Refraction per table 
Distances corr. for refraction = 
Error of the sextant 
Sun’s semidiameter 
\ difF. or the dip found 
Altitude reduced - = 
Zenith distance = 
The sun’s declination N. = 
Latitude of the ship N. = 
South. North. 
78° 
36' 
3 °" = 
101 ° 
1' 
20" 
— 
0 
11 = 
+ 
O 
11 
00 
3 6 
19 = 
101 
1 
3 i 
+ 
1 
32 
+ 
1 
3 2 
+ 
1 5 
58 
+ 
15 
00 
*0 
00 
l'- 
53 
49 
101 
19 
1 
— 
6 
25 
00 
53 
49 
78 
47 
24 
0 
00 
r-t 
12 
50 
11 
12 
36 
180 
DifF. 12 30 
4 3 2 3 ° • # = 6 2 5 
Dip. 
15 45 06 
I regret that I cannot in this paper insert the dip which I 
have found in my observations ; for I only retained the latitude 
of the ship determined thereby, as is usual at sea ; I generally 
rejected the error of the instrument, the dip, and semidiameter, 
as they afFect both observations with the same signs, and re- 
duced the observation by the following method : 
MDCCXCVII. 
G 
