Western Easter
Sunday, March 31, 1991
Gregorian computus. Golden number 16, epact 14, Paschal full moon March 30.
Easter 1991
Easter 1991: Sunday, March 31
In 1991 Western Easter, reckoned in the Gregorian calendar, falls on Sunday, March 31, 1991. Orthodox Easter (Pascha), reckoned in the Julian calendar, falls on Sunday, April 7, 1991, one week later.
Orthodox Easter
Sunday, April 7, 1991
Julian computus: March 25 in the Julian calendar, plus 13 days to reach the Gregorian calendar.
In 1991 the two Easters are 7 days apart: Orthodox Easter is one week after Western Easter. They last fell on the same day in 1990 (April 15). They next fall on the same day in 2001 (April 15).
Western · Mar 31
Orthodox · Apr 7
MarchAprilMayThe moving feasts of 1991
Western feasts, 1991
| Feast | Date | From Easter |
|---|---|---|
| Shrove Tuesday | Tuesday, February 12, 1991 | −47 days |
| Ash Wednesday | Wednesday, February 13, 1991 | −46 days |
| Palm Sunday | Sunday, March 24, 1991 | −7 days |
| Maundy Thursday | Thursday, March 28, 1991 | −3 days |
| Good Friday | Friday, March 29, 1991 | −2 days |
| Holy Saturday | Saturday, March 30, 1991 | −1 day |
| Easter Sunday | Sunday, March 31, 1991 | Easter Sunday |
| Easter Monday | Monday, April 1, 1991 | +1 day |
| Ascension Day | Thursday, May 9, 1991 | +39 days |
| Pentecost | Sunday, May 19, 1991 | +49 days |
Orthodox feasts, 1991
| Feast | Date | From Easter |
|---|---|---|
| Clean Monday | Monday, February 18, 1991 | −48 days |
| Palm Sunday | Sunday, March 31, 1991 | −7 days |
| Great and Holy Friday | Friday, April 5, 1991 | −2 days |
| Pascha (Easter Sunday) | Sunday, April 7, 1991 | Easter Sunday |
| Ascension | Thursday, May 16, 1991 | +39 days |
| Pentecost | Sunday, May 26, 1991 | +49 days |
Each date is Easter Sunday plus or minus a fixed number of days; the offsets and their sources are on the about page. Observance varies by church and by country. Whether a feast is a day off work is a matter of each country’s law: Holidays lists each country’s public holidays, off the open Nager.Date database.
How early is Easter in 1991?
March 31 is date 10 of the 35 that Western Easter can take, March 22 to April 25: 9 days after the earliest possible date and 25 days before the latest. Of the 201 Easters from 1900 to 2100, 36 fall on an earlier date than this one and 156 fall on a later date. 8 other years in that span share the date: 1907, 1918, 1929, 2002, 2013, 2024, 2086, 2097. Before 1991, Western Easter last fell on March 31 in 1929; after 1991 it next does in 2002.
In the 1990s Western Easter ran from March 30 (1997) to April 19 (1992); 1991’s March 31 is the second-earliest of the ten. Across the twentieth century (1901–2000) Western Easter falls on March 31 in 4 years, and the Western and Orthodox Easters share a Sunday in 26 years.
Orthodox Easter on April 7 is March 25 in the Julian calendar; 13 days carry it to the Gregorian calendar in 1991. From 1900 to 2100 Orthodox Easter falls on an earlier Gregorian date in 7 years and on a later one in 190 years; it falls on the same date in 1912, 2075, 2086.
The earliest and latest Easters from 1900 to 2100, with how often each date occurs, are on their own page.
The arithmetic for 1991
16Golden number: the year’s place in the 19-year cycle of the moon, (1991 mod 19) + 1.
14Gregorian epact: the age of the reckoned moon at the start of the year.
March 30Paschal full moon of the Gregorian reckoning, a Saturday. Easter is the Sunday after it.
April 3Paschal full moon of the Julian reckoning in Gregorian dates (Julian March 21), a Wednesday.
The two algorithms, worked for 1991
- Western: the Anonymous Gregorian algorithm
a=15 b=19 c=91 d=4 e=3 f=1 g=6 h=9 i=22 k=3 l=0 m=0h + l − 7m + 114 = 123, and 123 ÷ 31 = 3 remainder 30: month 3, day 30 + 1. March 31- Orthodox: Meeus’s Julian algorithm
a=3 b=3 c=15 d=0 e=3d + e + 114 = 117, and 117 ÷ 31 = 3 remainder 24: Julian March 25. Plus 13 days: April 7
How the date of Easter is calculated explains each letter. The dates on this page agree with the US Census Bureau table (Western), the 5ko.free.fr tables (Western and Orthodox), each read September 28, 2026.