42 
Mr. Huddart's Observations , &c. 
South: North. 
Sun’s dist. as before 
0 
CO 
36' 
3 °" 
' 101° 
1' 
20" 
Refraction 
— 
0 
11 
+ 
0 
11 
Dis. corr. for refraction 
00 
36 
19 
101 
1 
3 1 
101° 
1' 
31" 
+ 78 
19 
Sum of S. diam. dip, and 
Sum 179 
37 
50 
refraction = \ diff. 
+ 
11 
5 
180 
+ 
11 
5 
00 
47 
24 
Diff. 
22 
10 
— 
1 
2 
1 1 
5 
101 
12 
36 
9 ° 
90 
The^-dist. as before = 
11 
12 
3 6 
1 
2 
D. : 
= 11 
12 
3 6 
It may be observed, that neither the dip, semidiameter, or 
index error, can affect the zenith distance of the sun’s centre ; 
and the refraction being small near the zenith, the result must 
be true if the angles are accurately taken ; and it is only neces- 
sary to observe, that when the sum of the distances is less than 
i8o°, the half difference must be added to the distances, as by 
the last reduction. There is a difficulty in making this observa- 
tion when the sun passes the meridian very near the zenith, as 
the change in azimuth from east to wesfjs too quick to allow 
sufficient time; nor can it be obtained by the sextant when the 
sun passes the meridian more than 30 degrees from the zenith; 
for I never could adjust the back observation of the Hadley’s 
quadrant with sufficient accuracy to be depended upon. 
