Geocentric Model (Ptolemaic)
A comprehensive cosmological model positioning the Earth at the center of the universe, with celestial bodies moving in complex orbital paths (epicycles).
Core metadata
- ID: geocentric_model_ptolemaic
- Era: Classical
- First known date: 150 (year)
- Region: Alexandria, Roman Egypt
- Review status: source_checked
- Maturity: N/A
Prerequisites
- Early Astronomical Observation (early_astronomy_observation)
- Geometry (geometry)
- Philosophy (philosophy)
- Trigonometry (trigonometry)
Dependents
- None.
Fields
- None.
Node sources
- Almagest (Encyclopaedia Britannica, 2026, textbook) • Supports: node
Locator: Britannica dates Ptolemy's Almagest to about 150 CE and states that Book 1 argues for a geocentric spherical cosmos with trigonometry for planetary prediction.
Prerequisite edge evidence
Edge/source evidence summary:
- Prerequisite edges: 4
- Average edge confidence: 70%
- Prerequisite sources: 3
- expert_inference: 4
| Prerequisite | Type | Confidence | Evidence level | Note | Sources |
|---|---|---|---|---|---|
| Geometry (geometry) | enabling | 68% | expert_inference | Geometry provides a capability that enables this technology without being the only possible path. |
|
| Philosophy (philosophy) | enabling | 68% | expert_inference | Philosophy provides a capability that enables this technology without being the only possible path. |
|
| Trigonometry (trigonometry) | enabling | 68% | expert_inference | Trigonometry provides a capability that enables this technology without being the only possible path. | No sources recorded. |
| 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. |
|
This page is generated from canonical era JSON and is indexable by URL.