Moonwise: New Easter Dates: Website by William Morris listing
the Easter Sunday dates from 1997 to 2105, according to the Orthodox (Julian) reckoning, the Gregorian reckoning and the Aleppo 1997 Proposal
for the Calculation of Easter.
Les textes constitutifs du calendrier grégorien:
Rodolphe Audettes website on the history of the Gregorian calendar and Easter reckoning is currently off-line. This link is a mirror of
Rodolphe Audettes website on the website of Henk Reints. A Dutch translation can be found
Calendar Conversion Software
Calendar Tools: Online calculator by O. Lieberknecht
gives indiction and year according to various styles.