AT THE OBSERVATORY AT PARAMATTA. 
47 
On December the 14th, 15th, 16th, 17th and 18th, I had repetitions on Venus 
about the meridian, with Reichenhach’s Circle, of which the abstract is sub- 
joined. 
1826. 
Corr. Zen. Dist. 
Limb. 
Reduct, to the 
Meridian. 
Change of 
Declination. 
Semidia- 
meter. 
Merid. Zenith 
Distance. 
Dec. 15 
1°1 41 40.3 
11 39 30.5 
Cent. 
Cent. 
- 
- 49 49.94 
— 47 18.64 
-f 10.5 
- 10.9 
10 52 0.86 
11 52 0.96 
Dec. 16 
11 50 59-61 
11 10 24.81 
U 
Cent. 
— 45 50.76 
— 4 35.63 
+ 10.77 
- 3.0 
+ 30" 
11 5 49.62 
11 5 46.18 
Dec. 17 
11 25 40.66 
Cent. 
— 5 54.61 
- 3.6 
11 19 42.45 
Dec. 18 
11 54 29.3 
Cent. 
20 29.95 
- 7-7 
11 33 51.65 
The above Zenith Distances are corrected for Refraction, but not for Parallax. 1 
The Reduction to the Meridian will serve to correct the Parallax. The culmi- 
nations of Venus observed with the transit, have been corrected for semi-dia- 
meter, and the hour ang'le thence deduced is corrected for the acceleration of 
Venus above the fixed stars, which is here additive. It depends upon the rela- 
tive situation of the Sun and Venus, whether in the repetitions left and right 
the planet can always be observed on the same side of the wire, or whether 
it must be observed alternately on different sides. The mean arc will be ac- 
cordingly the zenith distance of the centre, or that of one of the limbs. 
Inferior Conjunction of Venus, July and August 1828, observed with the 
Mural Circle and Transit at Paramatta. 
The lower limb of Venus has been observed throughout. The observed 
Right Ascensions are those of the first limb before the conjunction, but after 
conjunction those of the last limb of Venus. The Sun’s Parallax has been 
subtracted from his Refraction, but to Venus no Parallax has been applied. 
1828. 
Barom. 
Therm. 
Stars’ Names. 
Observed Ap- 
parent Tv. 
Observed S. P. D. 
Refraction. 
Sun’s 
Semidia- 
meter. 
Correct. S. P. D. 
of Stars’ Ap- 
parent Place. 
July 1 1 
inches. 
30.05 
0 
50 
Sirius 
h m s 
O / // 
73 30 18.4 
6 18.00 
73 30 36.1 
July 12 
30.05 
53 
Sun’s upp. limb 
7 24 55.31 
111 44 23.525 
1 17-56 
112 1 26.89 
30.00 
54 
Venus’s low.limb 
8 57 15.38 
103 59 33.65 
1 3.62 
104 0 37-27 
29.98 
51 
Arcturus 
14 7 50.83 
110 3 40.25 
1 19.4 
111 4 59.6 
29.96 
52 
Sirius 
6 37 34.27 
73 30 21.60 
0 17.94 
73 30 39-54 
