Mr Innes on the Solar and Lunar Eclipses of 18&8. 175 
earth’s atmosphere. Astronomers seem doubtful how much is 
to be added to the semidiameter of the shadow of the earth, as 
projected at the distance of the moon ; but the quantity must 
certainly bear some proportion to the parallax. 
I send you the elements of the solar eclipse, for the use of 
such as may wish to make a projection ; but from the instant of 
greatest obscuration falling between 5 and 6 o’clock, it will be 
found very difficult to determine, with sufficient accuracy, the 
distance of the corresponding points on the respective paths. 
In reference to this eclipse, it will be interesting to observe 
whether any visible impression is made on the sun’s limb, at 
those places which are situated about the extremity of the pen- 
umbra. Such places will be found a little to the west, south- 
west, and south of London. 
The Elements of the Solar Eclipse are as follows: 
Mean time of Ecliptic Conjunction at Edinburgh, 
July 8. 6 
32 
4,79 
Equation of Mean to Apparent time at conjunction, 
— 
4 
29,99 
Hence the /Ipparent time of conjunction, is 
8, 6 
27 
34,80 
Longitude of the Sun and Moon, from true equinox, 
105 
14 
14,74 
Sun’s Right Ascension, - - 
106 
32 
19,62 
Declination north decreasing, 
22 
35 
30,6 
horary motion in longitude, 
0 
2 
23,00 
Right Ascension, 
0 
2 
23,93 
Declination, 
— 0 
0 
16,10 
semidiameter, ... 
0 
15 
45,57 
horizontal parallax, 
0 
0 
8,65 
— — Latitude, - 
+ o 
0 
0,03 
Horary increase of the equation of time, 
Obliquity of the Ecliptic, - 
0 
0 
0,396 
23 
27 
49,76 
Moon’s Latitude North decreasing, 
1 
8 
42,77 
1 
1 
21,15 
horizontal semidiameter, 
0 
16 
42,12 
horary motion in Longitude at conjunction, 
— for the hour preceding, 
for the hour following, 
horary motion in Latitude at conjunction, 
- - — - for the hour preceding, 
■ ■■ for the hour following, 
Angle of the relative path with the Ecliptic, 
Horary motion of the Moon from the Sun in the relative Orbit, 
0 37 59,971 
0 38 0,072 
0 37 59,871 
0 3 25,88$ 
0 3 25,610 
0 3 26,162 
5 50 12,5 
0 35 43,78 
The following are the results which I have obtained in cal- 
culating for Edinburgh : 
