List of future calendar events

This list assumes that these calendars continue to be used in their current form without further adjustments.

Years from now Gregorian
date 		Event
52 2077 Beginning of the 16th century in the Islamic calendar.
71 2096 Ash Wednesday will occur on February 29 (leap day) for the first time since the start of the Gregorian calendar in 1582.[1]
75 2100, March 1 First century non-leap year since 1900.
75 2100, March 14 On March 14 (which will be February 29 in the Julian calendar), the difference between the Julian calendar and the Gregorian calendar reaches 14 days. Since 14 is divisible by 7, this will be the first time in history since its inception that the Gregorian calendar has the same day of the week for each day of the year as the Julian calendar. This will last until February 28, 2200 of the Gregorian Calendar.
189 2214 Rosh Hashanah will fall on October 6 for the first time.
214 2239 September 29 The Year 6000 begins in the Hebrew calendar.
235 2260 Rosh Hashanah will fall on September 6 for the last time in over 10,000 years.
260 2285 Unless changes are made in the religious calendar, the Western Easter will fall on March 22 for the first time since 1818, the earliest possible date on which Easter can occur.[2]
328 2353 The date of Easter as conventionally calculated will be five weeks earlier than its hypothetical date according to astronomical principles, in a "negative equinoctial paradox". Along with 2372, this will be one of only two such occurrences between 2020 and 4000.[3]
347 2372 The date of Easter will see another "negative equinoctial paradox", this time four weeks earlier than its hypothetical date. This will be the last such occurrence before the year 4000.[3]
366 2391 Palm Sunday and Saint Patrick's Day will coincide for the first time since 1940; the "wearing of the shamrock and the palm together" was seen as presaging a great event in Ireland.[4]
375 2400 The first century leap year since 2000.
775 2800, March 1 The second century leap year in the 3rd millennium, in accordance with the Gregorian calendar. The Revised Julian Calendar, however, observes a leap year in 2900 instead; those Orthodox Churches (e.g. Greek) using the Revised Julian Calendar to calculate fixed-date feasts will, if no changes are made to the calendar before then, celebrate fixed-date feasts a day earlier than Catholic and Protestant churches from March 2800 until February 2900. For example, through this century, such Orthodox Churches will be celebrating Christmas Day while simultaneously Catholic and Protestant churches are marking Christmas Eve.[5]
≈2750 4772 October 13 The Mesoamerican Long Count calendar, assuming a turnover value of 20 b'ak'tuns, will require a sixth order.
2,884 4909 The Gregorian calendar will be a full day ahead of the solar year.
3,984 6009 The first Strobogrammatic numbered year since 1961.
10,000 12025 The Gregorian calendar will have drifted by about 10 days in relation to the seasons.[6]
10,867 June 10, AD 12,892 In the Hebrew calendar, due to a gradual drift in relation to the solar year, Passover will fall on the northern summer solstice (it has historically fallen around the spring equinox).[7]
18,849 AD 20,874 The lunar Islamic calendar and the solar Gregorian calendar will share the same year number. After this, the shorter Islamic calendar will slowly overtake the Gregorian.[8]
25,000 27025 The Tabular Islamic calendar will be roughly 10 days out of sync with the Moon's phases.[9]
46,876 March 1, AD 48,901[note 1] The Julian calendar (365.25 days) and Gregorian calendar (365.2425 days) will be one year apart.[10]
The Julian day number (a measure used by astronomers) at Greenwich mean midnight (start of day) is 19 581 842.5 for both dates.

See also

Notes

  1. ^ Manually calculated from the fact that the calendars were 10 days apart in 1582 and grew further apart by 3 days every 400 years. March 1 AD 48900 (Julian) and March 1 AD 48901 (Gregorian) are both Tuesday.

References

  1. ^ "Perpetual Easter Calculator: Liturgical Year".
  2. ^ "Selected Christian Observances". aa.usno.navy.mil. Archived from the original on January 2, 2013. Retrieved March 21, 2018.
  3. ^ a b Zeyer, Klaus Peter (2020). "Häufigkeit von Osterparadoxien: Negative Äquinoktialparadoxien der Jahre 2353 und 2372 als seltenste Variante". Regiomontanusbote. 33: 5–10.
  4. ^ "Palm Sunday in old Ireland - World Cultures European". www.irishcultureandcustoms.com.
  5. ^ "Changing Times, Changing Dates - Greek Orthodox Archdiocese of America". Greek Orthodox Archdiocese of America. Retrieved 13 July 2024.
  6. ^ Borkowski, K.M. (1991). "The Tropical Calendar and Solar Year". J. Royal Astronomical Soc. Of Canada. 85 (3): 121–130. Bibcode:1991JRASC..85..121B.
  7. ^ Bromberg, Irv. "The Rectified Hebrew Calendar". Archived from the original on January 17, 2018. Retrieved October 15, 2020.
  8. ^ Strous, Louis (2010). "Astronomy Answers: Modern Calendars". University of Utrecht. Archived from the original on June 5, 2013. Retrieved September 14, 2011.
  9. ^ Richards, Edward Graham (1998). Mapping time: the calendar and its history. Oxford University Press. p. 93. ISBN 0198504136.
  10. ^ "Julian Date Converter". US Naval Observatory. Archived from the original on October 6, 2007. Retrieved July 20, 2012.
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