Dictionary term
Callippic Cycle
Direct answer
Callippic Cycle: The Callippic Cycle is a 76-year refinement of four Metonic cycles, traditionally shortened by one day to improve lunar alignment.
The Callippic Cycle refines the Metonic pattern across 76 years.
The Callippic Cycle refines the Metonic pattern across 76 years.
A cycle or timeline schematic for comparing the named timekeeping concept.Quick reference
- Use when
- Use the Callippic Cycle in histories of Greek astronomy, lunar tables, and long-period calendar correction.
- Do not use it for
- Do not present it as a calendar universally adopted across the ancient Mediterranean.
- Reference category
- Calendars & Timekeeping
- Related terms
- Metonic Cycle, Dominical Letter, Calendar, Julian Date
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The story behind Callippic Cycle
Callippus proposed the refinement in the fourth century BCE by combining four nineteen-year cycles and reducing their total length.
Callippic Cycle in spiritual tradition
Spiritually, the Callippic Cycle models the wisdom of revising inherited knowledge when measurement reveals drift.
Callippic Cycle: fact and faith, kept distinct
This is a factual calendar, astronomy, Earth-science, cultural-history, or observational reference. It can support wonder and practical planning without becoming a claim of fate, spiritual causation, or private revelation.
Callippic Cycle in numerology
Callippic Cycle is not a numerology claim. Any numbers attached to it should retain their ordinary scientific, calendrical, navigational, or historical meaning unless a separate symbolic interpretation is clearly labeled.
Why Callippic Cycle matters
It illustrates how ancient astronomers corrected a useful cycle after recognizing its accumulated error.
Callippic Cycle at work: an example
A Callippic scheme treats 940 lunar months as one day shorter than four unadjusted Metonic cycles.
Where interpretation stops
Callippic Cycle is presented as sourced astronomy, calendrical, Earth-science, cultural, or instrument-history reference. Definitions should distinguish measured phenomena from civil convention and historical interpretation, preserve location and time dependencies, and avoid turning factual sky data into a deterministic personal claim.
Sources and editorial method
Research references used for this entry include:
- U.S. Naval Observatory: Astronomical Almanac Glossary - Reference definitions for astronomical periods, coordinates, dates, and time scales.
- Source
- The Great Almanac Dictionary
- Category
- Calendars & Timekeeping
- Also appears in
- Calendars & Timekeeping
- Aliases
- None listed
- Last updated
- 2026-07-16
See how ancient cycles were corrected
Callippic Cycle in a book is one thing; Callippic Cycle in your own birth chart is your life. The Oracle casts your real chart and tells you what it means for your love, your work, and your year ahead, in conversation, free.
Speak with the OracleRelated terms
More in Calendars & Timekeeping
- Draconic Month
- Geocentric Coordinate Time
- Intercalation
- Local Apparent Solar Time
- Ordinal Date
- Sidereal Year
- Unix Time
- Astronomical Day
Common questions
What is Callippic Cycle?
The Callippic Cycle is a 76-year refinement of four Metonic cycles, traditionally shortened by one day to improve lunar alignment.
How is Callippic Cycle used in an almanac?
Use the Callippic Cycle in histories of Greek astronomy, lunar tables, and long-period calendar correction.
What should I avoid when interpreting Callippic Cycle?
Do not present it as a calendar universally adopted across the ancient Mediterranean.
