Julian calendar
Calendar introduced by Julius Caesar
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We include updates on Old Style and New Style dates, Doomsday rule, Zeller's congruence, Common year starting on Friday, Common year starting on Monday, Determination of the day of the week, Common year starting on Thursday, Common year starting on Wednesday, Leap year starting on Thursday, Dominical letter, Common year starting on Sunday, Leap year starting on Friday, Common year starting on Saturday, Leap year starting on Saturday, Leap year starting on Sunday, Common year starting on Tuesday ... and more.
| March 16 2025 |
Doomsday rule
The current year for which the Doomsday rule is being demonstrated, highlighting the ongoing utility of this calendar calculation method.
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| 2024 |
Determination of the day of the week
A leap year starting on Monday, corresponding to the 1996 calendar year. The first two months correspond to the first two months of 2018, and the last ten months correspond to the last ten months of 2019.
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| September 2024 |
Byzantine calendar
Beginning of the year 7533 in the Byzantine calendar, marking the ecclesiastical new year as traditionally observed by Orthodox Christians.
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| 2023 |
Determination of the day of the week
A common year starting on Sunday, corresponding to the 2017 calendar year.
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| 2023 |
Old Calendarists
The schismatic Orthodox Church of Ukraine adopted the Revised Julian calendar, marking a significant calendrical shift for the religious organization.
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| May 2023 | The Orthodox Church of Ukraine announced they would use the Gregorian calendar to celebrate Christmas on December 25, 2023, partly in response to Russia's invasion of Ukraine in early 2022. |
| 2022 |
Indiction
Illustrated a calculation edge case where the standard indiction formula (Y + 3) mod 15 produces 0, leading to the refined formula (Y + 2) mod 15 + 1 to correctly calculate the indiction value of 15.
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| 2022 |
Determination of the day of the week
A common year starting on Saturday, corresponding to the 2011 calendar year. The last ten months correspond to the last ten months of 2016.
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| January 1 2022 |
Common year starting on Friday
A common year starting on Friday in the obsolete Julian calendar.
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| 2021 |
Determination of the day of the week
A common year starting on Friday, corresponding to the 2010 calendar year. The first two months correspond to the first two months of 2016.
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| January 1 2021 |
Common year starting on Friday
Most recent common year starting on Friday in the Gregorian calendar begins.
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| 2020 |
Determination of the day of the week
Last occurrence of a leap year starting on Wednesday.
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| 2019 |
Byzantine calendar
Protopresbyter Doru Costache published 'The Orthodox Doctrine of Creation in the Age of Science', discussing Orthodox Christianity's approach to creation and scientific understanding.
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| 2018 |
Common year starting on Monday
The most recent common year that started on Monday in the Gregorian calendar.
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| 2017 |
Indiction
Demonstrated calculation of Roman indiction, showing the formula (Y + 3) mod 15 results in an indiction value of 10 for this year.
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| 2017 |
Common year starting on Monday
Year 10 of the Julian calendar cycle where common years can start on Monday.
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| 2017 |
Byzantine calendar
Alexander V. Khramov published 'Fitting Evolution into Christian Belief: An Eastern Orthodox Approach', examining the relationship between Christian faith and evolutionary theory from a Greek patristic perspective.
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| June 15 2014 | The Polish Orthodox Church switched to using the Julian calendar from this date. |
| 2011 |
Byzantine calendar
The second edition of 'Genesis, Creation, and Early Man' was published, compiling Orthodox-Byzantine perspectives on biblical chronography based on Fr. Seraphim Rose's work.
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This contents of the box above is based on material from the Wikipedia articles Common year starting on Friday, Old Calendarists, Common year starting on Monday, Julian calendar, Doomsday rule, Determination of the day of the week, Indiction & Byzantine calendar, which are released under the Creative Commons Attribution-ShareAlike 4.0 International License.