RECENT CHANGES IN THE SURFACE OF JUPITER. 67 
EASURE OF THE EQuaToRIAL Betts. 
Measuring from the south pole of Jupiter to each belt in suc- 
cession. 
” 
South pole to BE 2... ssscccsseees 13°60 1554 15°94 
> blag wag py 20°60 19°71 19°34 
yn dee eRe aes 23°67 22567 2455 
peveeb iste 29°12 31°86 
” %? H 
* The letters refer to the same belts in each year. 
Tt will be seen that these measures F’ and G refer to the two 
equatorial belts which are situated one on each side of Jupiter's 
equator, in latitude 18° north and south ; each is about 4,000 miles 
wide, and very regular in form. In the northern one the air is 
probably clear, and the light that we see it by is very little, as we 
should ex from i 
from all other markings, as if it were above them and made up of 
& number of bright red bars laid side by side, forming round the 
planet a magnificent girdle which has a lustre like si 
18 oltener a warm brown colour, and although nearly as w 
defined as the northern one, it is by no means so striking. : 
Going northwards from the equatorial belts, we find in latitude 
36° to 38° another well-defined but usually faint belt, of which I 
tie more to say presently; and in th th latitud oth 
which in 1876 was clear enough, but is now often invisible, 
Probably because the south pole of Jupiter is turned away from 
sun. On this belt is the now well-known red spot. Besides 
* See diagram, 
H 
