The age of the new moon at the beginning of the year.
This number is used in this encyclopedia to determine the dates of
observances which are related to phases of the moon (such as Easter).
The epact may be determined for years 1582 to 4200 as follows.
Where N is the "golden number", and c is the century (e.g. 19 for 1999).
First calculate N by adding 1 to the year, dividing by 19, and taking the remainder.
Also use only the remainder when dividing by 30. When dividing
the century terms by 3 or 4, discard the fractions.
Century
Last Two Digits of Year
00 19 38 57 76 95
01 20 39 58 77 96
02 21 40 59 78 97
03 22 41 60 79 98
04 23 42 61 80 99
05 24 43 62 81
06 25 44 63 82
07 26 45 64 83
08 27 46 65 84
09 28 47 66 85
10 29 48 67 86
11 30 49 68 87
12 31 50 69 88
13 32 51 70 89
14 33 52 71 90
15 34 53 72 91
16 35 54 73 92
17 36 55 74 93
18 37 56 75 94
1600
15
26
7
18
29
10
21
2
13
24
5
16
27
8
19
0
11
22
3
1700
9
20
1
12
23
4
15
26
7
18
29
10
21
2
13
24
5
16
27
1800
4
15
26
7
18
0
11
22
3
14
25
6
17
28
9
20
1
12
23
1900
29
10
21
2
13
24
5
16
27
8
19
0
11
22
3
14
25
6
17
2000
24
5
16
27
8
19
0
11
22
3
14
25
6
17
28
9
20
1
12
2100
19
0
11
22
3
14
25
6
17
28
9
20
1
12
23
4
15
26
7
2200
13
24
5
16
27
8
19
0
11
22
3
14
25
6
17
28
9
20
1
2300
8
19
0
11
22
3
14
25
6
17
28
9
20
1
12
23
4
15
26
2400
4
15
26
7
18
0
11
22
3
14
25
6
17
28
9
20
1
12
23
2500
28
9
20
1
12
23
4
15
26
7
18
29
10
21
2
13
24
5
16
2600
22
3
14
25
6
17
28
9
20
1
12
23
4
15
26
7
18
29
10
2700
18
29
10
21
2
13
24
5
16
27
8
19
0
11
22
3
14
25
6
2800
13
24
5
16
27
8
19
0
11
22
3
14
25
6
17
28
9
20
1
2900
7
18
29
10
21
2
13
24
5
16
27
8
19
0
11
22
3
14
25
3000
2
13
24
5
16
27
8
19
0
11
22
3
14
25
6
17
28
9
20
To look up the epact for any year using the table, find the century in the left
column, and the last two digits of the year in the top row.
Find the intersecting cell, and that is the epact for the year.
For example, the epact for 1965 is in the row for 1900 and the column for 65.
The epact for 1965 is 27.
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