Calculation of Easter Sunday online for year 2004

ItemFormulaResult
Golden numbergn = (year % 19) + 110
Julian epactje = 11 × gn % 3020
Centuryce = year / 100 + 121
Solar correctionsc = 3 × (ce - 16) / 43
Lunar correctionlc = 8 × (ce - 15) / 251
Gregorian epactge = (je - 10 - sc + lc) % 308
March date of Ecclesiastical full moon
(Click here for show conversion table)
for ge <= 23: fm = 44 - ge36
for ge = 24: fm = 49
for ge = 25 and gn < 12: fm = 49
for ge = 25 and gn >= 12: fm = 48
for ge >= 26: fm = 74 - ge
date of Ecclesiastical full moonApril 5
Gregorian correctiongc = 10 + sc13
Day of week for Ecclesiastical full moon
The number 0 is Sunday, 1 is Monday, and so on until 6, which is Saturday
dfm = (year + year / 4 - gc + fm) % 71
March date of the first Sunday after the Ecclesiastical full moones = fm + (7 - dfm)42
Easter Sunday falls on the first Sunday after the Ecclesiastical full moonApril 11

Gregorian
epact
Ecclesiastical
full moon
23March 21
22March 22
21March 23
20March 24
19March 25
18March 26
17March 27
16March 28
15March 29
14March 30
13March 31
12April 1
11April 2
10April 3
9April 4
8April 5
7April 6
6April 7
5April 8
4April 9
3April 10
2April 11
1April 12
0April 13
29April 14
28April 15
27April 16
26April 17
25/25April 17/18
24April 18