When Will Easter Be on April 23rd Again

Astronomical and Gregorian Easter Sunday

The engagement of Easter Sun is commonly defined as the offset Sunday that falls after the full moon, sometimes chosen the Easter or Paschal Full Moon, that occurs later the bound equinox. Every bit the precise computation of the moments of the spring equinox and the astronomical full moon is complex and laborious the determination of Easter Sunday has always been based on a simplified method.

The date of the spring equinox is hereby fixed as 21 March and the 'ecclesiastical' full moon dates are obtained from a table based on the mean motions of the sun and the moon. The Easter Full Moon is the tabular full moon that occurs on or later on 21 March and the starting time Sunday that occurs afterward is Easter Lord's day. The earliest possible engagement for Easter Sunday is thus 22 March, which can only occur when the Easter Full Moon falls on Sat 21 March.

As the astronomical spring equinox can really occur on xix, 20 or 21 March and the astronomical full moon tin likewise fall a day earlier or later than its mean tabular date information technology sometimes happens that the Easter date, equally computed from the true motions of the dominicus and the moon, differs from the date as adamant from the ecclesiastical rules.

The following tables listing the years between 1583 and 2500 when the dates of astronomical Easter Sun and Gregorian Easter Sunday are dissimilar. The tables are based on Jean Meeus, Mathematical Astronomy Morsels (Richmond: Willmann-Bong, 1997), pp. 364–366 and Mathematical Astronomy Morsels V (Richmond: Willmann-Bong, 2009), p. 390. Also tabulated are the golden number (G) and the Easter engagement difference in weeks (Δw).

From 1583 to 2000

Twelvemonth	Easter Sunday					Twelvemonth	Easter Lord's day
	Astronomical	Gregorian	G	Δw			Astronomical	Gregorian	Thou	Δw
1590	25 March	22 April	14	+4		1825	10 April	3 April	two	–1
1598	29 March	22 March	three	–i		1829	26 April	19 Apr	6	–1
1609	26 April	19 April	14	–one		1845	30 March	23 March	3	–one
1622	3 April	27 March	viii	–one		1876	9 April	16 April	15	+1
1629	8 Apr	15 April	15	+1		1900	22 April	15 April	i	–i
1666	21 March	25 April	xiv	+5		1903	19 April	12 April	4	–i
1685	25 March	22 April	14	+4		1923	viii April	1 April	5	–ane
1693	29 March	22 March	3	–1		1924	23 March	twenty Apr	6	+4
1700	four April	11 April	10	+i		1927	24 Apr	17 April	ix	–1
1724	9 April	16 April	15	+1		1943	28 March	25 Apr	6	+4
1744	29 March	five Apr	16	+1		1954	25 April	18 April	17	–1
1778	12 April	19 April	12	+ane		1962	25 March	22 April	6	+4
1798	one Apr	viii April	xiii	+ane		1967	ii April	26 March	11	–1
1802	25 Apr	18 April	17	–ane		1974	7 April	xiv April	xviii	+i
1818	29 March	22 March	14	–ane		1981	26 April	nineteen April	vi	–1

From 2001 to 2500

Yr	Easter Dominicus					Year	Easter Lord's day
	Astronomical	Gregorian	G	Δw			Astronomical	Gregorian	G	Δw
2019	24 March	21 April	six	+iv		2296	22 March	19 April	17	+four
2038	28 March	25 Apr	6	+iv		2299	23 April	xvi Apr	ane	–1
2045	2 April	9 April	13	+ane		2316	nine April	16 Apr	18	+ane
2049	25 April	eighteen April	17	–1		2336	29 March	5 April	19	+1
2057	25 March	22 April	6	+4		2339	two Apr	26 March	3	–one
2069	7 Apr	14 Apr	18	+1		2353	26 Apr	22 March	17	–5
2076	22 March	xix April	half-dozen	+four		2372	23 April	26 March	17	–4
2089	27 March	iii April	ix	+i		2390	1 April	8 April	16	+i
2095	27 March	24 April	6	+4		2394	24 April	17 Apr	1	–1
2096	viii April	xv April	7	+ane		2410	28 March	25 April	17	+4
2106	25 April	18 Apr	17	–one		2417	9 April	two April	5	–one
2114	25 March	22 April	half dozen	+4		2421	25 Apr	18 Apr	ix	–i
2119	two April	26 March	xi	–1		2429	25 March	22 April	17	+4
2133	22 March	19 April	vi	+four		2437	29 March	22 March	6	–1
2147	23 April	xvi Apr	1	–1		2448	22 March	19 April	17	+four
2150	xix April	12 Apr	4	–1		2451	23 Apr	16 April	1	–one
2170	eight April	i April	5	–ane		2467	27 March	24 April	17	+four
2171	24 March	21 Apr	6	+4		2468	8 April	fifteen April	18	+1
2174	24 April	17 Apr	9	–1		2471	12 April	5 April	2	–1
2190	28 March	25 April	6	+4		2486	24 March	21 April	17	+4
2201	26 April	xix April	17	–1		2488	28 March	four April	19	+ane
2221	8 April	fifteen April	eighteen	+1		2491	one April	25 March	3	–1
2245	20 April	13 April	4	–ane		2492	20 April	xiii April	iv	–ane
2277	25 March	22 April	17	+4		2495	17 Apr	10 April	7	–1

Co-ordinate to the traditional Easter reckoning, both Dionysian and Gregorian, the extreme possible dates for Easter Lord's day are 22 March and 25 Apr.

In the astronomical reckoning, however, Easter Sunday tin occur every bit early on as 21 March (equally in 1666) and as late as 26 April (every bit in 1609, 1829, 1981, 2201 and 2353). Fifty-fifty 20 March is a possible date in the astronomical reckoning, when the bound equinox falls on 19 March and the total moon afterwards on the aforementioned date (beingness a Saturday). Nonetheless, in the period considered here (1583–2500) this never happens.

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Source: https://webspace.science.uu.nl/~gent0113/easter/easter_text3a.htm

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