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THE HAMILTON ASSOCIATION. 47 
First it reveals the fact that Jupiter revolves upon. itself 
every 9 hours 55 minutes. ‘This is the length of Jupiter’s day. 
By marking one of its belts we can easily determine that in 9 
hours and 55 minutes it returns to its first position. 
Like the Earth, Jupiter has also a movement around the 
Sun, but instead of traveling the path of its orbit in 365 days, 
as the Earth, it takes 4,300 days, or 12 years. This is natural 
for keeping at 483,000,000 miles from the Sun, it has a very 
much longer course to pursue than the Earth. Then its travel- 
ing per minute is slower, 480 miles; to the Earth, 1,080 miles a 
minute. Something very important of notice is that Jupiter 
has scarcely any declination during its journey around the orbit. 
Any person who has not studied astronomy may have 
gained the knowledge from geography that the earth tapers or 
declines at the poles and at the equator during its yearly course 
around the Sun. This brings the { tn’s rays sometimes 
obliquely, sometimes almost perpendicularly on different zones 
of the Earth, and this causes the four seasons of the vear. 
V.G. Weare now nearer the Sun than at any time of the 
year. The Earth is at the short radius of its eliptical orbit; 
yet the Sun, instead of being warmer, is colder, and we have 
winter because the Sun’s rays fall obliquely or less perpendicu- 
larly, if you wish, than in summer. 
Now all this is done away with in Jupiter. The Sun’s 
rays fall equally perpendicusar or equally obliquely on the dif- 
ferent zones of its surface the year round. This does not 
mean that there is perpetual day or perpetual night. Some- 
thing of this may take place at its poles. But almost univer- 
sally on Jupiter, darkness and light, sunrise and sunset suc- 
ceeds one another rapidly every five hours. 
Picture if you can the velocity of Jupiter’s rotation on 
tself; 1,300 times larger and revolving every 9 hours 55 
minutes makes its speed 27 times greater than the Earth. It is 
flattened at the poles and bulged out at the Equator, and well 
it may, being only in fluid state and revolving so fast. 
Returning to Jupiter’s formation, it bears out in a most 
striking manner the theory that the Earth was once an im- 
