ASTRONOMY.
2ft<)
No.
Names and Flaces of the Stars.
o
■Jk
Tj
£3
Magnit.
£3 . Ti
•< C3 £
^ .£P
Declination,Jim. 1, 1810.
Ann. var.
in Declin.
Semidinfor Lr
Real.
nial Arc>ndon.
Apparent.
115
In the bow of Sagittarius ....
4
H.
18
M.
3
s.
54
Sec.-3,58-4,00-2,01-t rfi
O
20
/
40
20 S.30 S
- 0.20- 0 . 7.1
K. M. S.
4 6 8
H. M. S.
4 10 *>$
116
s
2
i
18
11
31
34
27
2 1 50
2 10 8
117
Bright Star in the Harp , (I.vra, Wega)...
18
30
29
47
38
36
4- 2.54
Sets nearly.3 19 19
US
9
3
1 s
33
40
27
10
26 S
2,68
3 24 30
1 19
In the left shoulder of Sagittarius ....
3
18
11
-3,47
_o 00
-u’,h
- 2,99
-3,61
L3,77
0
26
30
32 S.
3 24 45
8 29 50
120
In the constellation of the Harp .
IS
18
18
18
18
18
19
ty
45
35
q
11 N
9 40 46
9 48 19
6 23 36
6 23 35
4 2 24
131122i 23
j- Double Star in the tail of the Serpent.j
In the head of Sagittarius.
&
3
3
46
46
VI
47
48
1 8
-
3
3
22
57
57_
o*
43 N.
37 N.31 S.58 S.30 N.
38 >;
+ 3,85-j- 3,85
— 4,36
- 4,50J- A. 8 5
6 19 59
6 19 58
3 57 56
124
125
In the breast of Sagittarius .
fn the constellation of the Eagle ...
t
3
3
55
9
40
27
43
553 5
3 12 54
7 -10 47
3 18 13
7 14 39
126
In the body of the Dragon .„
3
12.
29
-Lit i)*,
07
19
44
9
40
<>t)
f- 6,23
127
In the wing of the Kagle ....
&
3
15
_
(V>
O
31 N.97 X
- 6,31
- 8,07
L 8 '>7
6 13 48
6 17 25
12S
3
19
]_i)
373941
i 1
1
-2,86
-1,88
10
6 52 4
6 55 48
129
3
3
14 N.10 N.50 N.40 S.14 S33 S.
Set? not.
6 46 20
130
1
19
19
20202020202020202J
31
59
8
5
131
A
3
45
-2,96
-3,11
-3,35
-3,35
-3,35
50
O'*
- 8,70
- 9,95-10,40-10,40-10,60-10,63L 10 in
6 30 6
6 33 45
5 56 39
132
Q
1
3\
1
13
13
Ly
5 53 4
1 a
4
7
" l
4 55 53
4 55 40
134
2 a
3
7
31J8
3250
7
4 51 52
A
3
2
10
10
30
34
38
1 >1
22
19
1436
1547
n
4 39 9
4 43 4
136
57
U>
52 S.52 N.
Iliads not.
7 20. 9
137
3
-2,79
7 24 6
133
0
3
3
44
33
61
6
-12,46
Li <>
Sets not.
9 42 4
Sets not,
9 49 42
139
140
In the wing of the Swan ...
r
31
2
-2,40
-1,44
-3,18
27 N.ON.6 S.
XT
In the right shoulder of Cophcus.
lit 1 ,
A
3
21
21
3- i
-15,30
5 27 33
5 31 12
;i4J
7
4
21<> i
<A) A*
-3,35
-3,32
17
30
16
54 S.52 S.
-15,70-16,08iR OR
4 26 32
4 30 36
‘14-i
's
3
33
2
15
4 40 8
5 44 ^3
4 44 2
146
2
3
3
4
21
oj
12
3
-3,85-3,10-3,11-3,08-3,22-3,32-3,06-2,88f-9,97-3,12-2,88-3,69lo on
47
]
52
14
20
''5
17 S.
18 S.30 S.
ON.0 S
17,1 1
147
58
11
15
-17,10
17,76
5 57 21
5 51 48
148
22
no
51
35
34
7
13
2
0
5 48 12
149
On the right thumb of Aquarius.
1-17,91
-18.90
6 5 41
150
In the right leg of Aquarius, (Scheat),..
£
3
°2
44
16
30
<2
49
37
47
3
4 30 40
4 34 42
151
152
In the mouth of the South fish, (Komalhaut) ...In the mouth of the zodiacal South Fish.
a
13
9
1
4
22
<)0
47
54
29 S.56 N.
— 18,98+ 19,17+ 19,18+ 19,20-19,41+ 19,84+20,02+20,04-L'10.04
2 47 45
6 14 6
2 53 53
6 17 42
In the shoulder of Peirasus, (Scheat) .
o
o< >
27
7 N.
8 39 46
S 45 1
154
In the wing of Pegasus, Markab.
2
4
22
23
55
4
IS
29
17
14
n
7 N.
8 S,0 N
7 14 6
5 24' 8
7 17 59
5 27 47
156
I X
4
23
28
■ 45
20
23
40
5
48
48 N.
6 29 8
6 32 47
158
p
Q
23
25
10
3 )
58
0
5° N.
159
ec
2
58
-3,06
28
0
31 N
8 48 9
8 53 37
The apparent anti real semidiurnal arcs contained in the above |Table are such as belong to the respective stars on Jan. ], 1810;"but on account of the constant variation of the stars in declination,the quantity of the semidiurnal arc, in the course of a few yearswill be sensibly changed, especially in those stars whose annualmotion in declination is very considerable. In order to find theexact semidiurnal arc at any period before or after Jan. 1, IS 10,find in the Table, (page 285,) the difference of the semidiurnalarc for 10' of declination at the given declination of the star, andsay 600" is to this difference, as the annual motion of the star indeclination is to the quantity of the annual change of it? semidiur-nal arc. If the given time be after Jan. 1, 1810, this quantity mustbe applied to the tabular semidiurnal arc with the same sign as theannual variation in declination, if the star be to the north of theequator ; ami vice versa when the stgr is to the south. But if thegiven time be before 1810, the whole will be reversed.
Trample 1. Required the apparent semidiurnal arc of the « in the ;head of Andromeda, on Jan. 1,1812. —In the Table of Semidiurnal [Arcs for the latitude of London , the difference for 10 minutes of de-VOL. I.—NO. 1!).
clinalion at 28° 2'31" N. is ft 1 seconds. And 600" is to 91 seconds, as-f-20",04, the star’s annual variation in declination, according tothe preceding Table, is to 3",039 of time, the annual sariation ofthe star’s semidiurnal arc. This doubled gives (>'',078 for the va-riation in two years, and addj-d to Rli. 53!n. 37s. the tabularsemidiurnal arc, because the declination is north, and the variationin declination affirmative, the time being after 1810, the sum,8h. 53m. 43,078s. will be the correct apparent semidiurnal arc forJan. 1, 1812, as required.
F.rample 2. Required the apparent semidiurnal arc of irima!-haut, a star of the lirst magnitude, in the mouth of the South Fish,on Sept. 19, 1825.—In the Table of Semidiurnal Arcs the differ-ence tor 10 minutes of declination at 30'' 37' 29’ S. is 99 seconds.And 600 " is to 99 seconds of time, as — 18",98, the star’s annualvariation in declination, is to 3", 13, the annual change of the star’ssemidiurnal arc. Also 3',13 multiplied by 25,718 years, the timeafter Jan. 1, 1810 , the product, 1 m., 20",49734, will be the varia-! tion of the semidiurnal arc from that in the Table on Sept. 19,j 1825. This quantity added to 2h, 53m. 33s. the tabular semi-‘ ’ 4 E diurnal