[ «94 ] 
Zenith diftance 
ot Sirius at Cape, 
obferved and re- 
duced. 
Annual 
parallax 
to reduce 
obfervat. 
to mean. 
Zenith diftance 
corrected for an- 
nual parallax. 
Difference between 
each obfervation cor- 
related, and the mean 
of the diftances cor« 
re£ted. 
O / // 
11 
1751. July 12. 
17 31 19. 1 
~ 4-3 
17 31 14.8 
- 1. 1 
July 13- 
17 3 1 J 9-3 
— 4-3 
I 7 31 I5.O 
- 0.9 
July 14. 
21.7 
— 4-3 
17.4 
4 - 1.5 
July 15- 
19.7 
- 4-3 
154 
- 0.5 
July 16. 
19.0 
— 4*3 
I4.7 
- 1.2 
1752. April 5. 
16.7 
— 1.0 
I 5-7 
— 0.2 
April 3. 
*5 7 
— 0.8 
14.9 
- 1.0 
March 28. 
14.0 
— 0.4 
13.6 
- 2.3 
March 14. 
131 
4- 0.7 
,3.8 
- 2.1 
March 8. 
15.2 
4- 1.2 
16.4 
h o-S 
March 5. 
18.8 
~h r -4 
20.2 
b 4-3 
March 4. 
J 7-3 
+ i -5 
18.8 
- 2.9 
March 1 . 
15-9 
-4- 1.6 
17-5 
- 1.6 
Feb. 17. 
12.8 
-j- 2.6 
15.4 
- 0.5 
Jan. 21. 
11. 1 
4 - 4 -o 
I 5 - 1 
- 0.8 
1751. Dec. 31. 
"• 6 i 
4 ~ 4-5 
16.1 
+ 0.2 
Mean of zenith diftances corrected 
for parallax - - - - - *7 3 1 J 5’9 
The firft column fhews the year and day of the 
obfervations ; the fecond the zenith diftances of Si- 
rius at the cape of Good Hope, as delivered in Abbe 
de la Caille’s recital ; the third contains the computed 
values of the parallax at different times, taking that 
of the maximum p" j the fourth column gives 
obfervations reduced to the mean, by applying 
the parallax computed in the third column to the 
obfervations in the fecond j which quantities ought 
all to agree together, if the obfervations were liable 
to no error, and the parallax was rightly aftumed : 
but, taking a mean of them all, the laft column 
fhews how much each of them differs from that 
mean. 
