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16 PHILOSOPHICAL SOCIETY OF WASHINGTON. 
The value of A may be shown to be zero (0) for any year from 
1700 A. D. to 1899 A. D., both inclusive, during New Style, and 
for all years during Old Style. 
p =q—h=the interval in days from March 21st to the date 
of the Paschal full moon, or the number of days to be added to 
March 21st to find the date of the Paschal full moon. 
If p = zero (0), the Paschal full moon accordingly falls on the 
21st of March. 
n—(1+2(5),-1-(G),+ Go). ) 
ZL denotes the number (in alphabetical order) of the Dominical 
or Sunday letter. Thus, the number corresponding to the Domini- 
cal letter A is 1, to B is 2, to C is 3, to D is 4, to E is 5, to F is 6, 
and to G is 7 or 0 (zero). 
c ; ; , 
The term (a5) gives a correction to the Gregorian value when 
Ww 
the year exceeds 4000 A. D.; for any year less than 4000 the 
value of this corrective term is obviously zero (0). 
(? ae rime 3+6p+L 
a ee 
7 r 7 r 
t denotes the number of days which elapse after the date of the 
Paschal full moon to the date of Easter Sunday. 
Easter Sunday = March (21 +1+p+#—1) 
= March (21 + p + 2) 
== April (p+t— 10) 
To find the date of Easter Sunday for any year, A. D., Old Style. 
aif Feat c.f 100g = 2) 
eae ( ie a9 ( r 
19 19 
The formula for n is the same as in New Style. 
(Gee ae = (ets (ae 
q=p= 2 ), =), = 
Ee Gascon 5 
7 ys 
pain (C=HEY), = (EYP) 
rE 
