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The Celestial Sphere

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Title: The Celestial Sphere


1
The Celestial Sphere
2
The Celestial Sphere
  • Appears as a dome over our heads.

3
The Celestial Sphere
  • Appears as a dome over our heads.
  • Stars seem embedded like tiny jewels

4
The Celestial Sphere
  • Appears as a dome over our heads.
  • Stars seem embedded like tiny jewels
  • Stars all appear to be the same distance from
    Earth.
  • Makes a great model of what we see.

5
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6
Model of the Celestial Sphere
7
Notice that the Celestial Poles are directly
above the Earths Poles...
8
C.N.P.
Notice that the Celestial Poles are directly
above the Earths Poles...
9
C.N.P.
Notice that the Celestial Poles are directly
above the Earths Poles...
10
C.N.P.
Notice that the Celestial Poles are directly
above the Earths Poles...
C.S.P.
11
C.N.P.
Notice that the Celestial Poles are directly
above the Earths Poles...
C.S.P.
12
C.N.P.
C.S.P.
13
and that the Celestial Equator is directly above
the Earths Equator.
14
and that the Celestial Equator is directly above
the Earths Equator.
Celestial Equator
15
and that the Celestial Equator is directly above
the Earths Equator.
Celestial Equator
Celestial Equator
16
Declination
17
Declination is like latitude.
18
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
19
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
20
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
21
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
22
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
23
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
24
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
25
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
26
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
27
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
28
90o (dec)
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
29
90o (dec)
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
30
90o (dec)
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
31
90o (dec)
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
32
90o (dec)
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
33
90o (dec)
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
34
90o (dec)
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
35
90o (dec)
Declination is like latitude.
Declination uses () and (-) to denote
positions north and south of the Celestial
Equator.
0o (dec)
- 90o (dec)
36
Right Ascension
37
Right Ascension is like longitude.
38
Right Ascension is like longitude.
Positions are measured in hours and minutes in
one direction only
39
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40
  • By convention, the great circle with right
    ascension of 0 hours runs through a point in the
    constellation Pisces at which the ecliptic
    crosses the celestial equator, and right
    ascension increases going eastward

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6h
47
6h
48
6h
49
6h
50
6h
51
6h
52
12h
6h
53
12h
6h
54
12h
6h
55
12h
6h
56
12h
6h
57
12h
6h
58
18h
12h
6h
59
18h
12h
6h
60
18h
12h
6h
61
18h
12h
6h
62
18h
12h
6h
63
18h
12h
6h
64
18h
0h
12h
6h
65
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66
Using both Declination and Right Ascension
67
Using both Declination and Right Ascension
any star can be located on the Celestial Sphere.
68
For Example
69
For Example
A star like Rigel
70
For Example
A star like Rigel is found at
71
For Example
A star like Rigel is found at
- 8o 11 (dec)
72
For Example
A star like Rigel is found at
- 8o 11 (dec)
5 h 15 (RA)
73
For Example
A star like Rigel is found at
- 8o 11 (dec)
5 h 15 (RA)
74
For Example
A star like Rigel is found at
- 8o 11 (dec)
5 h 15 (RA)
75
For Example
A star like Rigel is found at
- 8o 11 (dec)
5 h 15 (RA)
76
For Example
A star like Rigel is found at
- 8o 11 (dec)
5 h 15 (RA)
77
Good To Know
  • The right ascension and declination of each star
    are fixed from day to day and year to year.  But
    because the Earth is wobbling in space because of
    the gravitational influence of the Moon and Sun,
    the coordinates of celestial objects change over
    the course of decades.  Every 50 years or so,
    star maps and star coordinates are updated. 
    Current star maps are accurate as of the year
    2000.
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