Botjes planetarium

Botjes Planetarium
Botjes' table of planetary data
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Botjes' table of planetary data

English translation and comments:

 

Motion of the planets around the sun.

 

1

2

3

4

5

6

7

8

9

10

11

Mercury

8

1.65

9.65

6.35

46

75

7

1.9

2111.241h

2111.241 h

Venus

15

0.15

15.15

14.85

75

127

323'

1.7

5392.695 h

5392.692 h

Earth

20 2/3

0.35

21.03

20 1/3

-

100

-

-

8765.816 h

8765.8125 h

Mars

31 1/2

3

34.5

28.5

48

333

151'

2

16,489 h

16,486.305 h

Jupiter

107 1/2

5.25

111.85

102.35

99

12

119'

5

103,930.6 h

103,934.236 h

Saturn

197

11.2

208.2

185.8

112

90

229'

17.2

257,873 h

257,926 1/2 h

Uranus

396/

223

18.3

241.3

204.7

73

168

046'

5.2

30,656 d

30,686 d

 

Column headings:

1. Planet name

[Neptune was discovered in 1846, but did not have a well determined orbit by 1853 when work on the planetarium was begun.]

2. Average distance (mm on the planetarium)

[The planetarium distances are those of the actual solar system scaled by 7.2 trillion, excepting Uranus. The first value for Uranus is the correct scaled number, the second value is the 44% smaller number actually used so that it fit on the dial.]

3. Half the range of distance (mm)

4. Maximum distance (mm)

5. Minimum distance (mm)

6. Ascending node (degrees)

[Three columns in Botjes' table that have been omitted here may be computed from the ascending node: descending node (add 180), the highest position (add 90), and the lowest position (add 270).]

7. Longitude of perihelion (degrees)

[Botjes' table also included a column for aphelion, which is 180 plus perihelion.]

8. Inclination of orbit to ecliptic (degrees and minutes)

9. Full range of vertical height (mm)

10. Orbital period in the planetarium (hours or days)

11. Orbital period from astronomical tables (hours or days)

 


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Written 8/27/3 by Larry Molnar