1 66 Dr, MaskelyneV Obfervations on the Latitude 
Years 
of ob- 
vations. 
Summer fol- 
ftitial zenith 
diftance re- 
duced. 
N° of 
days of 
obferva- 
tions. 
Winter folfti- 
tial zenith 
diftance. 
N° of 
days of 
obferva- 
tions. 
Half fum or 
latitude of 
the place. 
Half differ- 
ence or obli- 
quity of the 
ecliptic. 
1 7 6 5 
O / // 
O V // 
74 5 $ 46,1 
c / // 
51 28 38,2 
0 / 
28 O 30,2 
6 
5 
23 28 8,0 
176 b 
33 > 6 
7 
48,8 
f uncertain J 
J from an ^ 
l accident. J 
2 
41,2 
7 , 6 
1767 
3 2 >° 
6 
— 
— — 
— *— 
1768 
2 9’7 
6 
44,9 
7 
37,3 
7 , 6 
1769 
3 * 1 * 8 
8 
46,2 
5 
39 >° 
7,2 
1770 
3 °, 7 
7 
44 ,i 
6 
37,4 
4,7 
1771 
3 2 »° 
8 
42,2 
9 
37 ,t 
5 - 1 
1772 
3^8 
12 
Line of collimation altered by applying an achro- 
matic objedt-glafs to the telefcope. 
1 1 l . 
Mean 
28 0 31,5 
74 5 6 45,4 1 
is 1 28 38,4 
23 28 7,0 
Latitude5l 28 40 Onjan. 1, 
_ _ 1769. 
23 28 8,5 mean obliquity of ecliptic on Jan. 1, 1769. 
This laft obliquity 23 0 28' 8 // , 5 is deduced in the manner 
ufed by Dr. Bradley, and is more to be depended on than 
the other 23 0 28'' j",o deduced from both folftices, on account 
of the lefs certainty of the lower refractions, from which, 
however, it only differs a fecond and a half. 
Thus all the obfervations of the fun and circumpolar ftars 
accord to or 2 // with the latitude of the Obfervatory fettled 
by Dr. Bradley, making ufe of his refractions. 
I fhall now determine the latitude independent of Dr. Brad- 
ley’s refraCtions, and infer the higher refraCtions at the 
fame time, from a comparifoti of my obfervations of the 
apparent zenith diftance of the equator before fet down with 
Dr. Bradley’s obfervations of the apparent zenith diftance 
of the pole, both taken with the fame excellent brafs mural 
quadrant, in the fame manner as Dr. Bradley deduced them 
from 
