C 33° 3 
XXII. Astronomical Observations. By Stephen Groombridge, Esq . F. R. S. 
Read June 29, 1820. 
Observations of the Solstices in the years 1818 and 1819. 
Obsei'ved zenith distance of the Sun’s centre on the meridian. 
1818 
Barometer. 
Therm. 
within. 
Therm. 
without. 
Refraction. 
1819 
Barometer. 
Therm. 
within. 
Therm. 
without. 
Refraction. 
O / // 
1 II 
0 / // 
/ // 
June 1 3 
28.14 53.08 
29.79 
72.5 
8l 
0.29.77 
June 9 
23 - 33 - 30-54 
29.49 
61.5 
68 
0.30.54 
H 
28.1 1.38.72 
29.87 
68 
66 
O.30.IO 
16 
28. 6.40.00 
29.84 
58 
62 
C.30.62 
23 
28. 0. 5 55 
29 76 
62 
66 
0.30.15 
*9 
28. 1.20.52 
30.00 
62 
68 
0.30.38 
27 
28. 5.39.66 
29 75 
68 
79 
0.29.84 
20 
28. 0.21. 51 
30.II 
62.5 
66 
0.30.45 
28 
28. 8. 9.04 
29 69 
66 
73 
0.29.97 
21 
27 - 59 - 47-37 
30.04 
62.5 
68 
O.30.37 
29 
28.10.55 40 
30.08 
6 7 
72 
0.30.37 
July 1 
28.17 51-98 
30.00 
69.5 
77 
O.30.27 
Dec. 12 
74- 2 9 34-34 
30.06 
44 
4 ° 
3.31.92 
Dec. 13 
74 - 32-57 59 
29.70 
36 
3 2 -5 
3 - 33-32 
H 
74 37 - 55 - 16 
30-15 
43-5 
41 
3.34.10 
26 
7448.56.96 
29.44 
39 
32 
3 - 35 - 5 ° 
>9 
74 50 26.17 
30.21 
33 
34 
3 - 40-54 
27 
74.46.54.68 
29.39 
39 
34 
3 - 33-78 
22 
74 52 - 23-59 
3 ° 45 
42.5 
33 
3 - 43*5 
23 
7 4 52 - 3 -°° 
30.31 
38.5 
3 * 
3 42.94 
27 
74.46 16.87 
30.06 
39 
37 
3 37 -M 
The above observations computed by Mr. Groombridge’s Table of Refraction. 
1818 
Zenith distance. 
Equation. 
Solstitial 
distance. 
1819 
Zenith distance. 
Equation. 
Solstitial 
distance. 
O / // 
1 II 
O / // 
O / // 
/ 1/ 
O / II 
June 13 
28.15 22.85 
15. 15. 31 
28. O. 7.54 
June 9 
28.34. J -°8 
33-54 6 5 
28. 0. 6.43 
*4 
12. 8.82 
* 1 - 55-34 
13.48 
16 
7. 10.62 
7 - *-93 
8.69 
23 
O.35.7O 
0.24.43 
II.25 
*9 
1.50.90 
1.39.50 
1 1.40 
27 
6. 9.50 
6. 1. 1 5 
8-35 
20 
0.51.96 
0.41.67 
IO.29 
28 
8.39.01 
8.27.31 
1 1.70 
21 
0.17.74 
0. 8.60 
9-*4 
29 
11.25.77 
11. 17.91 
7.86 
July l 
18.22.25 
18.12.52 
9-73 
0 
28. 0. 9.19 
— 
Nutation 
+ 9- 2 3 
II 
28. 0. g.qq 
Parallax 
— 4.11 
+ 4-62 
Nutation 
+ 7 - 4 ° 
Sun’s Latitude 
— 0.50 
Parallax 
-^4.11 
+ 2 -77 
S 
Sun’s Latitude 
— 0.52 
28. 0.13.81 
28. 0.12.76 
Dec. 13 
74.36.30.9 1 
19.36 30 
74.56. 7.21 
26 
52.32.46 
3-32.75 
5.21 
27 
50.28.46 
5.36-53 
4.99 
Dec. 12 
74.33. 6.26 
22.57.04 
74.56. 3.30 
*4 
41.29.26 
14.38.20 
7.46 
II 
74.56. 5.80 
*9 
54. 6.71 
1.58.1 1 
4.82 
Nutation 
— 9.60 
22 
56. 6.74 
0. 0.18 
6.92 
Parallax 
— 8.45 
— 18.58 
23 
55-45 94 
0.17.56 
3 - 5 ° 
Sun’s Latitude 
— 0.53 
27 
49.54.01 
6.10.39 
4.40 
74.55.47.22 
II 
74.56. 5.07 
28. 0.13.81 
Nutation 
— 8.64 
Parallax 
~ 8-45 
-17.58 
2)46.55.33.41 
Sun’s Latitude 
— 0-49 
1819 
Mean Obliquity 
- - - 
23.27.46.70 
74.55 47.49 
1818 
23 27.47.36 
28. 0.12.76 
Mean obliquity at the 7 
2)46.55.34.73 
vernal equinox, 1819.3 
23 - 2 7 - 47.°3 
Mean obliquity, 1818 
23.27.47.36 
-*■ . 
