Calendars
Systems for tracking time based on lunar and solar cycles, vital for agriculture, festivals, and civil life.
Core metadata
- ID: calendars
- Era: Ancient
- First known date: -3000 (millennium)
- Region: Global / multiple regions
- Review status: source_checked
- Maturity: N/A
Prerequisites
- Agriculture (agriculture)
- Early Astronomical Observation (early_astronomy_observation)
- Record Keeping (record_keeping)
Dependents
- Crop Rotation & Fallowing (crop_rotation_and_fallowing)
- Crop Rotation (Two-Field System) (crop_rotation_two_field)
- History (history)
- Mathematics (mathematics)
- Writing (writing)
Fields
- None.
Node sources
- Neolithic (Encyclopaedia Britannica, 2026, textbook) • Supports: edge, node
Prerequisite edge evidence
Edge/source evidence summary:
- Prerequisite edges: 3
- Average edge confidence: 73%
- Prerequisite sources: 3
- expert_inference: 3
| Prerequisite | Type | Confidence | Evidence level | Note | Sources |
|---|---|---|---|---|---|
| Agriculture (agriculture) | enabling | 68% | expert_inference | Agriculture provides a capability that enables this technology without being the only possible path. |
|
| Record Keeping (record_keeping) | historical_predecessor | 75% | expert_inference | Record Keeping is an earlier historical predecessor or foundation, not a one-to-one engineering dependency. |
|
| Early Astronomical Observation (early_astronomy_observation) | historical_predecessor | 75% | expert_inference | Early Astronomical Observation is an earlier historical predecessor or foundation, not a one-to-one engineering dependency. |
|
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