ASTRONOMICAL PROBLEMS. 515 
log cos C= 9°3922489 Cn=36° 31’ 6" 
log tan CP'= 9°7513982 Ist are= 7° 55! 29'°2 
log tan Ist arc=19°1436471 2nd arc=28° 35’ 36'°8 
log cos 2nd arc= 9:9435133 
log cos CP’= 9:9399977 
19°8835110 
—log cos Ist arc= 9-9958325 
log cos P'n= -9°8876785. 
By calculation =. Py =39" 27) 22/79 
in Bradley’s Catalogue =39° 27' 21" | 
Wig © OY iW), 
N.B. Bradley’s refraction corrections differed from those now used ; 
had he used our present tables, the results would have agreed 
within 1”. 
Ricut ASCENSION. 
Problem V. 
To calculate the R. A.’s of stars it will be necessary to determine 
the values of the angles CRE, CQE, CPE at the periods mentioned in 
Cc 
Pp : tol 
wD) Q R 
iS 9 9 
= Ye) Ne) 
= a 2 
4 ea) = 
— I 
the Fig. because the transit of C precedes the transit of E by the 
interval of time measured by those respective angles. The transits 
69—3 
