likewise c - 16 = 18 - 16 = 2, c - 15

3		 = 1, a = 0; therefore

E = 27 - 2 + 1 = 26 . . . (3).

Now since E > 23, we have for P and l,

P = 54 - E = 54 - 26 = 28,

l =57 - E

7		r = 57 - 26

7		r = 31

7		r = 3;

consequently, since p = P + (L - l),

p = 28 + (4 - 3) = 29;

that is to say, Easter happens twenty-nine days after the 21st of March, or on the 19th April, the same result as was before found from the tables.

The principal church feasts depending on Easter, and the times of their celebration are as follows:—

Septuagesima Sunday

is

9 weeks

before Easter.

First Sunday in Lent

6 weeks

Ash Wednesday

46 days

Rogation Sunday

is

5 weeks

after Easter.

Ascension day or Holy Thursday

39 days

Pentecost or Whitsunday

7 weeks

Trinity Sunday

8 weeks