Astrolabe & Quadrant
Sophisticated navigational and astronomical instruments for measuring the altitude of celestial bodies to determine latitude and time.
Core metadata
- ID: astrolabe_quadrant
- Era: Medieval
- First known date: 600 (century)
- Region: Late antique Mediterranean and early medieval Islamic/European astronomical instrument traditions
- Review status: source_checked
- Maturity: N/A
Prerequisites
- Bronze Working (bronze_working)
- Early Astronomical Observation (early_astronomy_observation)
- Geometry (geometry)
- Mathematics (mathematics)
- Navigation (navigation)
- Writing (writing)
Dependents
- Astronomy (astronomy)
- Global Exploration (exploration_global)
- Portolan Charts & Maritime Navigation (portolan_charts_maritime_navigation)
Fields
- None.
Node sources
- Astrolabe (Encyclopaedia Britannica, 2026, textbook) • Supports: node
Locator: Britannica traces astrolabes to the sixth century and describes their wide early-medieval use in Europe and the Islamic world. - Navigation (Encyclopaedia Britannica, 2026, textbook) • Supports: edge
Locator: Britannica navigation context supports the relationship between astronomical instruments and navigation practice.
Prerequisite edge evidence
Edge/source evidence summary:
- Prerequisite edges: 6
- Average edge confidence: 70%
- Prerequisite sources: 6
- expert_inference: 6
| Prerequisite | Type | Confidence | Evidence level | Note | Sources |
|---|---|---|---|---|---|
| Navigation (navigation) | enabling | 68% | expert_inference | Navigation provides a capability that enables this technology without being the only possible path. |
|
| Bronze Working (bronze_working) | enabling | 68% | expert_inference | Bronze Working provides a capability that enables this technology without being the only possible path. |
|
| Mathematics (mathematics) | enabling | 68% | expert_inference | Mathematics provides a capability that enables this technology without being the only possible path. |
|
| Geometry (geometry) | enabling | 68% | expert_inference | Geometry provides a capability that enables this technology without being the only possible path. |
|
| 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. |
|
| Writing (writing) | historical_predecessor | 75% | expert_inference | Writing is an earlier historical predecessor or foundation, not a one-to-one engineering dependency. |
|
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