388 THE BEAUTIES OF NATURE CHAP. 
Mercury, Venus, Mars, Jupiter, and Saturn — 
two large ones, Uranus and Neptune, and a 
group of minor bodies, have since been added. 
The following two diagrams give the rela- 
tive orbits of the Planets. 
Nenus w Mercury ‘ ; 
fina ay ea \ \ 
/ / Si . \ \ 
; / b ‘ H H 
H ; ; \ i \ ' 
' ' : { . i ' } 
i ea | Sun ! ; j 
. % / } H | 
' ‘ \ 3 / i H 
\ . MR ae 7 ; i 
‘ as te ont ’ ! 
\ ‘, 88 days “ / j 
\ 5. Si 4 / : ; 
N, ge er a yy 
. SS 225 d ays we 
Fe RTE es ee 
365 days 
~~ oe oo 4 
"687 days 
Fig. 51. — Orbits of the inner Planets, 
MERCURY 
It is possible, perhaps probable, that there 
may be an inner Planet, but, so far as we 
