GRAPHIC REDUCTION OF STAR PLACES. 
181 
longitude, the double angle accounting for the four appear¬ 
ances of the extreme values. It will be noticed that the 
range in A is about 0.05 and in B about 1", as demanded 
by the formula. In this connection it should be remem¬ 
bered that A is plotted on a scale 10 times its true value. 
The minor maxima and minima in A and B show the 
effect of the term depending on the moon’s mean longitude. 
The range for A is about one-half as much as that for B. 
There are twenty-seven maxima and minima during the 
year in each curve, which corresponds to twice the moon’s 
motion. 
