24 BROWN : 



(A'erbatim, literatim.) "Easter is the first Sunday after 

 the first full moon that occurs after the 21st of March ; to find 

 it add 6 to the Epact and subtract from 50 or if the sum is 

 above 30 subtract the remainder and the difference is the day 

 of the full moon counting from after March i ; this is called 

 the Easter limit, and Easter is the following Sunday. To fix 

 the day of the month add 4 to the number of the Dominical 

 Letter for the year and subtract the sum from the Easter limit ; 

 then take this remainder from an}' multiple of seven greater 

 than said remainder, add the new remainder to the Easter 

 limit and the sum will be the day on which Easter Sunday 

 falls; in March if less than 31 or in April if more than 31." 



We have seen that the latest possible Paschal full moon is 

 on the 1 6th of April. But on the arbitrary' basis of a thirty 

 days lunation it is on the i8th of April. For when a full falls 

 on the 20th of March the next is the Paschal moon, and its 

 full is just 29 days later, or the 49th of March, i8th of April, 

 which is the extreme limit of the Paschal full moon. More- 

 over, when the epact is zero the moon is full in a lunation and 

 a half or on the 45th day, the 14th of April. And it is clear 

 that subtracting the March epact from a lunation and a half 

 must give the number of days between the first of March and 

 the Paschal full moon. 



But a lunation and a half brings us to the 46th day, which 

 is 44 days after the first of March, and is reached by subtract- 

 ing 6 from 50, the extreme limit. 



Add, therefore, 6 to the epact and subtract the sum from 

 50 to get the number of days to the Paschal full moon, count- 

 ing from after the first of March. 



The Easter limit reaches from first of March to Paschal full 

 moon day, inclusive. 



The object of the second clause of the rule is to find the 

 numeral of Easter counting from March ist. The numeral of 

 the Paschal full moon is the next natural number to the 

 Easter limit. 



Now as the letter of every first of March is D, to find the 



