_Leo_; and in aphelio, or that
point of his orbit most distant from the sun, on the 22nd; he becomes
stationary on the 29th.
There is only one visible eclipse of Jupiter's first satellite this
month--on the 5th, at 10h. 21m. evening.
The Georgium Sidus, or Herschel, comes to an opposition with the sun on
the 19th, at 6h. 15m. evening; he is then nearest the earth, and
consequently in the most favourable position for observation; he began
retrograding on the 1st of May in 28 deg. 12m. of _Capricornus_; he
rises on the 1st, at 9h. 11m. evening, culminating at 1h. 16m., and
setting at 5h. 21m. morning, pursuing the course of the sun on the 17th
of January; he moves only 13m. of a deg. in the course of the month,
rising 2 h. earlier on the 31st.
This planet, called also Uranus, was discovered by Herschel on the 13th
of March, 1781. It is the most distant orb in our system yet known. From
certain inequalities on the motion of Jupiter and Saturn, the existence
of a planet of considerable size beyond the orbit of either had been
before suspected; its apparent magnitude, as seen from the earth, is
about 3-1/2 sec., or of the size of a star of the sixth magnitude, and
as from its distance from the sun, it shines but with a pale light, it
cannot often be distinguished with the naked eye.
Pages:
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46