[ 4°o ] 
The diftance therefore of thefe fpots from the 
center of the fun is 1,013767 femi-dia meters of the 
fun, and their diftance from his furface is in in de- 
cimal parts of his femi-diameter ,013767. Hence 
it is evident that the height of the folar fpots above 
the furface of the fun, is above 54 fuch parts, as 
bear each to the fun’s femi-diameter, the proportion 
of one Paris mile to the femi-diameter of the earth, 
which is that of 1 to 3923 nearly. The height of 
our atmofphere is generally reckoned about 50 
miles. That of the lighted clouds fall fhort of one 
mile. The whole height of our atmofphere there- 
fore is, at leaft, 50 times that of our high eft clouds. 
It the whole height of the fun’s atmofphere bear 
as large a proportion to the height of thele folar 
fpots or clouds (and I think the proportion is likely 
to be much larger), the height of the fun’s atmo- 
iphere is not lefs in proportion to his femi-diameter, 
than 54 times that of the earth’s, and exceeds two 
thirds of his femi-diameter, being in decimal parts 
thereof ,68835. 
The probability feems to be that the height of 
the fun’s atmofphere is almoft double of this; for 
I queftion whether the mean height of our clouds 
exceeds 4. a Paris mile. The folar fpots, therefore, 
are 108 times as high in proportion ; and then, 
fuppoling as before, that the whole height of the 
fun’s atmofphere bears the fame proportion to the 
height of his fpots, as the whole height of our at- 
mopfhere to the mean height of our clouds, the 
fun’s atmofphere will be 108 times as high in pro- 
portion to his femi-diameter as ours is, and will rife 
