[ r 9 1 ] 
In computing, the going of his. clock from the 
c'or refpon ding altitudes of the fun, Mr. wk._i-.ght 
had neglected to apply the equation of the middle 
time, owing to the change of the Sun’s declination 
between the morning and afternoon obfervations, 
commonly called the equation of correfponding 
altitudes. —I have therefore made the proper al- 
lowance on this account, in computing the appa- 
rent time, on fuppofition, that the interval of time 
between the morning and afternoon obfervations was 
always four hours ; Mr. wright having informed 
me, it was always from three to five hours whence 
the equation may be allowed certainly within a 
fecond. : 
Mr. wright’s obfervations of the eclipfes 
of Jupiter 
’s firft fatellite, thus 
:orr 
edfed 
, are as fol- 
lows : 
Time 
at Greenwich 
Difference 
of me-- 
Apparent time 
per Naut. Almanac 
ridians. . 
i 7 6 j 
Im. 
h 
’ // 
h 
/ 
// 
h 
/ 
ft 
Jan. 
} 7 % 
14 
5 ° 
2 7 
1 9 
5 
2 9 
4 
2’ 
Feb. 
2. 
_ 
Im. 
1 3 
2 
21 
1 7 
*7 
53 
4 
*5 
3 2 
1 8. 
Im. 
1 1 
19 
0 
'5 
34 
H 
4 
*5 
14. 
Mar. 
2 5 * 
Im. 
'3 
*3 
46 
1 7 
2 9 
16 
4 
1 5 
3 ° 
2 9 * 
Em. 
1 2 
10 
59 
16' 
2 5 
27 
4 
14 
28 
April 
5 * 
EiYi. 
1 4 
7 
2 3 
18 
22 
1 1 
4 
14 
48 
- 
7 - 
'Em. 
8 
fb 
19. 
1 2 
5 l 
16 
4 
14 
57 
14. 
Em. 
to 
3 2 
56 
I/ T l 
VI 
48 
4 
14 
5 2 
3 °d 
Em; 
8 
54 
J 7 l 
l 3 
8 
59 
4 
14 
42 
The mean difference of meridians by the four 
immerfions is 4 h i §' U)\ n , and by the five imrner- 
fions is 4 h 14 45 1" both which ought to be cor- 
rected, by the help of the near eft obfervations made 
i ate 
