relating to the Mountains of the Moon. 519 
when it illuminates the top of the mountain, where- 
by its apparent height will be leffened, as we are too 
little acquainted with that atmofphere to take it into 
conlideration. It is alfo to be obferved, that this would 
equally affect the conclufions of hevelius, and there- 
fore the difference in our inferences would ftill remain , 
the fame. . 
Bath, February 28, 1780,. 
Continuation of the fame obfervations . 
March n, 1780, 7b. Promontorium Archerufia 
projected 1 7", 1 87 . It is very properly fituated for mea- 
furing. By a proper deduction from the Moon’s femi- 
diameter, as given by the Nautical Almanac, at the time 
of obfervation, we find the quantity on — 20.1 miles, 
and lm 22,6 miles ; from which it appears, that the per- 
pendicular height of this mountain is a little lefs than a 
quarter of a mile. 
Antitaurus, the mountain meafured by hevelius was 
badly fituated, beeaufe Mount Mofchus and its neigh- 
bouring hills call; a deep fhadow, which may be miftaken 
for the natural convexity of the Moon, A good, full, 
hut juft meafure, 25",! o' 5 ; .in .miles 29, 27 : therefore, 
LM 
