[ 4i6 ] 
-Obfervations on the Tranfit of Venus, June 3, 1769, by Dol- 
lond’s micrometer fitted to a reflecting telefcope of 18 inches 
focus, by Capt. James Cook, 
Venus’s diameter, foon after the ingrcfs. 
OIF thefcale 
On thefcale 
In. Dec. Ver. 
O 10 4 
o 10 3 
o 10 4 
o 10 4 
o 10 3I 
In. Dec. Ver. 
o 10 4 
o 10 6 
o 10 6 
O lO 5 
o 10 si 
By thefe meafurements the correc- 
^ tion of adjuftment of the micrometer 
— o| of a divifion of the vernier, and 
? ’s diameter 10 d. 4§ v. = 56,8. 
June 2 
Time per Gl. 
b / 
23 
23 
23 
23 
I 
46 
8 
36 
lO 
. H ^ 
23 24 36 
23 26 38 
.23 29 38 
23 31 54 
Appar. Time 
In. D. V. 
M S 
h ! / 
23 6 57 
3 20 20 
28 6,6 
23 10 42 
3 20 18 
28 4,6 
23 14 4 
3 20 IS 
28 1,4 
23 18 32 
3 20 10 
27 56,2 
23 28 32 
0 55 23 
5 8,8 
23 30 35 
0 60 3 
5 14,0 
23 33 35 
0 60 4 
5 i 5 »i 
23 35 5 » 
0 60 9 
5 20,3 
Greateft diflajice of f 
and O in outer contadl. 
Leafl: diflance of ? and 
O in outer contact. 
OflF the fcale 
Venus’s diameter June 3. 
On the fcale 
In. D. V. 
o 10 2 
1 
2 
2 
In. D. 
O 10 
V. 
By thefe meafurements the cor- 
redlion of adjuftment is — 25 and 
Venus’s diameter 0 10 4 = 
56,"28. 
Mean o lo i| 
o 10 6| 
The Sun’s horizontal diameter at 0'' 22'. 
In. D. V. 
2 60 18 
16 
'9 
17 
The 
