Harbor Lighthouses
Coastal signal towers and beacon fires that guided ships into harbors and marked dangerous approaches.
Core metadata
- ID: harbor_lighthouses
- Era: Classical
- First known date: -280 (decade)
- Region: Alexandria, Ptolemaic Egypt
- Review status: source_checked
- Maturity: N/A
Prerequisites
- Harbor Engineering (Breakwaters) (harbor_engineering_breakwaters)
- Navigation (navigation)
- Oil Lamps (oil_lamps)
Dependents
Fields
- None.
Node sources
- Lighthouse of Alexandria (Encyclopaedia Britannica, 2026, textbook) • Supports: node
Locator: Introduction identifies the Pharos as the most famous lighthouse in antiquity, an archetype for later lighthouses, finished about 280 BCE in Alexandria harbor.
Prerequisite edge evidence
Edge/source evidence summary:
- Prerequisite edges: 3
- Average edge confidence: 73%
- Prerequisite sources: 1
- expert_inference: 3
| Prerequisite | Type | Confidence | Evidence level | Note | Sources |
|---|---|---|---|---|---|
| Harbor Engineering (Breakwaters) (harbor_engineering_breakwaters) | enabling | 82% | expert_inference | Harbor infrastructure can be co-designed with these beacons, but it is contextual rather than strictly required. | No sources recorded. |
| Oil Lamps (oil_lamps) | enabling | 68% | expert_inference | Oil Lamps provides a capability that enables this technology without being the only possible path. | No sources recorded. |
| Navigation (navigation) | enabling | 68% | expert_inference | Navigation provides a capability that enables this technology without being the only possible path. |
|
This page is generated from canonical era JSON and is indexable by URL.