Calendars and time
Dominical Letter
Direct answer
Dominical Letter: A Dominical Letter is one of the letters A through G assigned to calendar dates so Sundays can be identified for a given year.
A Dominical Letter is a historical device for locating Sundays in a calendar year.
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At a glance
- Found in
- Calendars & Timekeeping
- Related
- Callippic Cycle, Tropical Year, Calendar, Julian Date
A Dominical Letter is a historical device for locating Sundays in a calendar year.
A cycle or timeline schematic for comparing the named timekeeping concept.
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The story behind Dominical Letter
European calendars repeated A through G over dates; the year Sunday letter changed with weekdays and leap-day structure.
Why Dominical Letter matters
Dominical Letter compressed weekday structure into a reusable almanac code useful for feast tables and perpetual calendars.
How to read Dominical Letter
Dominical Letter comes up when reading early printed calendars, computus tables, and historical almanacs.
Dominical Letter in practice: an example
A leap year can require two Dominical Letters because the weekday correspondence shifts after the inserted day.
Where readings of Dominical Letter go wrong
It is a mistake to read a Dominical Letter without knowing the calendar and leap-year convention behind the table.
Sources and editorial method
Research references used for this entry include:
- U.S. Naval Observatory: Introduction to Calendars - Official overview of calendar systems, leap rules, eras, and historical calendar reform.
- Source
- The Great Almanac Dictionary
- Category
- Calendars & Timekeeping
- Last updated
- 2026-09-26
Decode the historical Sunday cycle
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More in Calendars & Timekeeping
- Equation of Time
- Intercalary Day
- Leap Second
- Modified Julian Date
- Sidereal Month
- Anomalistic Year
- Calendar Month
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Common questions
What is a Dominical Letter?
A Dominical Letter is one of the letters A through G assigned to calendar dates so Sundays can be identified for a given year.
What do people get wrong about a Dominical Letter?
It is a mistake to read a Dominical Letter without knowing the calendar and leap-year convention behind the table.
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