152 ESSAYS anv OBSERVATIONS 
aphelion to be 30°, it is required to find 
the anomaly of the excentric. 
The log. tang. of 15° is 9.4280525 
The diff. of the logs. of AS, 
SP is 0.0146892 
The difference 9.4133633 
is the log. tang. of 14° 31/.3670421, half 
the difference of the angles CSB, CBS ; 
therefore the angle CSB, that is the an- 
gle ACD, is 29° 31/.367042; therefore 
the anomaly of the excentric is nearly 
39°31 .3670421, that is 29° 31/22'’.022526, 
which agrees very nearly with Dr Keii’s 
numbers in the forefaid Lecture. 
EXAMPLE VE 
AGAIN, in the earth’s orbit, fuppofe 
the mean anomaly to be 60°, it is re- 
quired to find the anomaly of the ex- 
centric. 
The log. tang. of 30, is 9-7614394 
The diff. of the logs. of AS, 
SP is 0.0146892 
The difference 9.9467 502i 
IS 
