Tables of Differences between the Dates of Orthodox and Western Easter, AD 1583 to AD 3000

First published on the WWW 1998 January 28; last updated 1998 April 16 by Marcos J. Montes.

Assumptions and Disclaimer

In preparing these tables, I have extrapolated the Julian and Gregorian calendars into the future, using the rules of each calendar. I have also used rules for the determination of Orthodox and Western Easter that are currently in use (and are valid in the past, to 1583). There is, of course, no guarantee that these particular rules will continue to be used in the future. The following tables are the result if one assumes the rules for determining Western and Orthodox Easter continue to be valid in the future.

As always, a necessary evil:
Disclaimer: This document is provided as is. No warranties are made as to its correctness or suitability for any use.

Table 1.

Number of years in each century CC (defined as the century lasting from CC00 to CC99) when the celebrations of Western and Orthodox Easter differ by the amount in the leftmost column.
                                Century (cc00-cc99)                        
      --------------------------------------------------------------
Weeks  
Diff.  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29    Total  
--------------------------------------------------------------------------
 0      6  47  41  34  26  31  21  20  17  11   6  11   0   0   0     271
 1      7  32  32  40  48  43  52  49  46  57  58  52  62  62  58     698
 2      0   0   0   0   0   0   0   0   0   0   0   0   1   1   0       2
 3      0   0   0   0   0   0   0   0   0   0   0   0   0   0   0       0
 4      2   5   6   5   5   4   0   0   0   0   0   0   0   0   0      27
 5      2  16  21  21  21  22  27  31  37  29  29  32  26  26  30     370
 6      0   0   0   0   0   0   0   0   0   3   7   5  11  11  12      49
--------------------------------------------------------------------------
Total  17 100 100 100 100 100 100 100 100 100 100 100 100 100 100    1417

Table 2.

Years when Western & Orthodox Easter are celebrated the same day, from 1583 to 3000. Notice that after 2698 they are not celebrated the same day.
(271 occurrences)
1583 1585 1588 1591 1594 1597 1600 1601 1604 1605 1607 1608 1611 1612 1615
1618 1621 1624 1627 1628 1629 1631 1632 1634 1635 1638 1639 1642 1645 1648
1649 1651 1654 1656 1658 1659 1662 1665 1666 1668 1669 1672 1675 1676 1678
1680 1683 1686 1689 1692 1695 1696 1699 1700 1702 1703 1706 1707 1710 1713
1716 1719 1722 1724 1726 1727 1729 1730 1733 1734 1737 1740 1743 1744 1746
1749 1753 1754 1757 1760 1763 1764 1767 1770 1773 1778 1781 1784 1787 1790
1791 1794 1797 1798 1801 1808 1811 1814 1817 1821 1824 1827 1828 1832 1835
1838 1841 1844 1847 1848 1851 1852 1855 1858 1859 1862 1865 1868 1871 1876
1879 1882 1885 1886 1889 1892 1895 1896 1906 1909 1912 1915 1916 1919 1922
1930 1933 1936 1939 1942 1943 1946 1950 1953 1957 1960 1963 1966 1974 1977
1980 1984 1987 1990 2001 2004 2007 2010 2011 2014 2017 2025 2028 2031 2034
2037 2038 2041 2045 2048 2052 2055 2058 2061 2069 2071 2072 2075 2079 2082
2085 2091 2095 2096 2099 2102 2105 2109 2112 2115 2126 2129 2132 2136 2139
2153 2156 2159 2163 2166 2177 2180 2183 2186 2190 2197 2200 2204 2207 2210
2221 2224 2227 2231 2234 2248 2251 2254 2258 2261 2272 2275 2278 2281 2292
2295 2302 2305 2316 2322 2326 2329 2346 2349 2356 2359 2370 2373 2376 2379
2383 2390 2397 2400 2403 2424 2427 2444 2447 2454 2468 2474 2478 2498 2522
2542 2549 2569 2573 2593 2603 2617 2623 2637 2644 2647 2664 2671 2688 2691
2698

Table 3.

Years when Orthodox Easter is 1 week after Western Easter, from 1583 to 3000.
(699 occurrences)
1586 1589 1590 1592 1593 1596 1599 1602 1609 1610 1613 1616 1619 1620 1623
1626 1630 1637 1640 1643 1646 1647 1650 1653 1657 1661 1664 1667 1670 1673
1677 1681 1684 1685 1687 1688 1691 1694 1697 1705 1708 1711 1714 1715 1718
1721 1725 1732 1735 1738 1741 1745 1748 1751 1752 1756 1759 1762 1765 1768
1771 1772 1775 1776 1779 1782 1783 1786 1789 1792 1795 1800 1802 1803 1805
1806 1809 1810 1813 1816 1819 1820 1822 1825 1829 1830 1833 1836 1839 1840
1843 1846 1849 1854 1857 1860 1863 1866 1867 1870 1873 1874 1877 1878 1881
1884 1887 1890 1893 1897 1898 1900 1901 1903 1904 1905 1908 1911 1914 1917
1920 1923 1924 1925 1927 1928 1931 1934 1935 1938 1941 1944 1947 1949 1952
1954 1955 1958 1961 1962 1965 1968 1969 1971 1972 1973 1976 1979 1981 1982
1985 1988 1991 1992 1993 1995 1996 1998 1999 2000 2003 2006 2009 2012 2015
2018 2019 2020 2022 2023 2026 2029 2030 2033 2036 2039 2042 2044 2047 2049
2050 2053 2056 2057 2060 2063 2064 2066 2067 2068 2074 2076 2077 2080 2083
2086 2087 2088 2090 2093 2094 2098 2101 2104 2106 2107 2110 2113 2114 2117
2118 2120 2121 2123 2124 2125 2128 2131 2133 2134 2137 2140 2142 2143 2144
2145 2147 2148 2150 2151 2152 2155 2158 2161 2162 2164 2167 2169 2170 2171
2172 2174 2175 2178 2181 2182 2185 2188 2189 2191 2193 2194 2196 2199 2201
2202 2205 2208 2212 2213 2215 2216 2218 2219 2220 2223 2226 2229 2232 2235
2237 2238 2239 2240 2242 2243 2245 2246 2250 2253 2256 2257 2259 2262 2264
2265 2267 2269 2270 2273 2276 2277 2280 2283 2284 2286 2288 2289 2291 2294
2296 2297 2299 2300 2303 2307 2308 2310 2311 2313 2314 2318 2319 2321 2324
2327 2330 2332 2333 2335 2337 2338 2340 2341 2343 2345 2348 2351 2352 2354
2357 2360 2362 2364 2365 2367 2368 2371 2375 2378 2381 2384 2386 2387 2389
2392 2394 2395 2398 2402 2405 2406 2408 2409 2410 2411 2413 2414 2416 2417
2419 2421 2422 2425 2428 2429 2430 2432 2433 2435 2436 2438 2440 2441 2443
2446 2448 2449 2451 2452 2455 2457 2459 2460 2462 2463 2465 2466 2467 2470
2471 2473 2476 2479 2481 2482 2484 2485 2486 2487 2489 2490 2492 2493 2495
2497 2500 2501 2503 2504 2506 2508 2509 2511 2512 2514 2516 2517 2519 2520
2523 2525 2527 2528 2530 2531 2533 2535 2536 2538 2539 2541 2544 2546 2547
2550 2552 2554 2555 2557 2558 2560 2561 2563 2565 2566 2568 2571 2574 2576
2577 2579 2580 2582 2584 2585 2587 2588 2590 2592 2595 2596 2598 2599 2601
2604 2606 2607 2609 2611 2612 2614 2615 2618 2620 2622 2625 2626 2628 2630
2631 2633 2634 2636 2639 2641 2642 2645 2649 2650 2652 2653 2655 2656 2658
2660 2661 2663 2666 2668 2669 2672 2674 2675 2677 2679 2680 2682 2683 2685
2687 2690 2693 2694 2696 2699 2701 2702 2704 2706 2707 2709 2710 2712 2713
2715 2717 2718 2720 2721 2723 2726 2728 2729 2731 2732 2734 2736 2737 2739
2740 2742 2744 2745 2747 2748 2750 2751 2753 2755 2756 2758 2759 2761 2763
2764 2766 2767 2769 2770 2772 2774 2775 2777 2778 2780 2782 2783 2785 2786
2788 2789 2791 2793 2794 2796 2797 2799 2801 2802 2804 2805 2807 2808 2810
2812 2813 2815 2816 2818 2821 2823 2824 2826 2827 2829 2831 2832 2834 2835
2837 2839 2840 2842 2843 2845 2846 2848 2850 2851 2853 2854 2856 2858 2859
2861 2862 2864 2865 2867 2869 2870 2872 2873 2875 2877 2878 2880 2881 2883
2884 2886 2888 2889 2891 2892 2894 2896 2897 2899 2900 2902 2903 2905 2907
2908 2910 2911 2913 2916 2918 2919 2921 2922 2924 2926 2927 2929 2930 2932
2935 2937 2938 2940 2941 2943 2945 2946 2948 2949 2951 2954 2956 2957 2959
2960 2962 2964 2965 2967 2968 2970 2973 2975 2976 2978 2979 2981 2983 2984
2986 2987 2989 2992 2994 2995 2997 2998 3000  

Table 4.

Years when Orthodox Easter is 2 weeks after Western Easter, from 1583 to 3000.
(2 occurrences)
2725 2820 

There are no years when Western Easter is 3 weeks before Orthodox Easter, from 1583 to 3000.


Table 5.

Years when Orthodox Easter is 4 weeks after Western Easter, from 1583 to 3000.
(27 occurrences)
1584 1587 1625 1652 1655 1679 1682 1720 1723 1747 1750 1774 1777 1807 1831
1872 1875 1899 1902 1926 1970 1994 1997 2021 2065 2089 2092  

Table 6.

Years when Orthodox Easter is 5 weeks after Western Easter, from 1583 to 3000.
(370 occurrences)
1595 1598 1603 1606 1614 1617 1622 1633 1636 1641 1644 1660 1663 1671 1674
1690 1693 1698 1701 1704 1709 1712 1717 1728 1731 1736 1739 1742 1755 1758
1761 1766 1769 1780 1785 1788 1793 1796 1799 1804 1812 1815 1818 1823 1826
1834 1837 1842 1845 1850 1853 1856 1861 1864 1869 1880 1883 1888 1891 1894
1907 1910 1913 1918 1921 1929 1932 1937 1940 1945 1948 1951 1956 1959 1964
1967 1975 1978 1983 1986 1989 2002 2005 2008 2013 2016 2024 2027 2032 2035
2040 2043 2046 2051 2054 2059 2062 2070 2073 2078 2081 2084 2097 2100 2103
2108 2111 2116 2119 2122 2127 2130 2135 2138 2141 2146 2149 2154 2157 2160
2165 2168 2173 2176 2179 2184 2187 2192 2195 2198 2203 2206 2209 2211 2214
2217 2222 2225 2228 2230 2233 2236 2241 2244 2247 2249 2252 2255 2260 2263
2266 2268 2271 2274 2279 2282 2285 2287 2290 2293 2298 2301 2304 2306 2309
2312 2315 2317 2320 2323 2325 2328 2331 2334 2336 2339 2342 2344 2347 2350
2353 2355 2358 2361 2363 2366 2369 2372 2374 2377 2380 2382 2385 2388 2391
2393 2396 2399 2401 2404 2407 2412 2415 2418 2420 2423 2426 2431 2434 2439
2442 2445 2450 2453 2456 2458 2464 2469 2472 2475 2477 2480 2483 2488 2494
2496 2499 2502 2507 2510 2513 2518 2521 2524 2526 2529 2534 2537 2540 2543
2545 2548 2551 2553 2562 2564 2567 2570 2572 2575 2578 2581 2589 2591 2594
2597 2602 2605 2608 2613 2616 2619 2621 2624 2627 2629 2632 2635 2638 2640
2643 2646 2648 2651 2657 2659 2662 2665 2667 2670 2673 2676 2684 2686 2689
2692 2695 2697 2700 2703 2714 2716 2719 2722 2724 2727 2730 2733 2741 2743
2746 2754 2757 2760 2765 2768 2771 2781 2784 2787 2790 2792 2795 2798 2809
2811 2814 2817 2819 2822 2825 2828 2836 2838 2841 2849 2852 2855 2860 2863
2866 2871 2876 2879 2882 2885 2887 2890 2893 2895 2904 2906 2909 2912 2914
2915 2917 2920 2923 2933 2934 2936 2939 2944 2947 2950 2953 2958 2961 2963
2966 2971 2974 2977 2980 2982 2985 2988 2990 2991 

Table 7.

Years when Orthodox Easter is 6 weeks after Western Easter, from 1583 to 3000. Notice that the first occurrence is 2437.
(49 occurrences)
2437 2461 2491 2505 2515 2532 2556 2559 2583 2586 2600 2610 2654 2678 2681
2705 2708 2711 2735 2738 2749 2752 2762 2773 2776 2779 2800 2803 2806 2830
2833 2844 2847 2857 2868 2874 2898 2901 2925 2928 2931 2942 2952 2955 2969
2972 2993 2996 2999  

Calculation of the Ecclesiastical Calendar
Last updated 1998 April 16.
Copyright © 1998 by Marcos J. Montes.
Marcos Montes
mmontes@no.spam.smart.net