388 



THE BEAUTIES OF NATURE 



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 diagranis give the rela- 

 tive orbits of the Planets. 



Maps . 



i 



\ 

 \ 

 \ 



\ 



.-^ 



('Venus fli/ 



Mercury \ 



\ 



I Sun .' 



<^Earth " 

 \ 



, ) ! 



v.. J J i 



/ 

 '■"' >•■' 



22"5days 



365"days 



y 



y 



687 davs 

 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 



