Urdi lemma
E311986
UNEXPLORED
The Urdi lemma is a geometric theorem developed by the 13th-century astronomer Mu’ayyad al-Din al-Urdi that underpins non-Ptolemaic planetary models in medieval Islamic astronomy and later influenced Copernican astronomy.
Referenced by (1)
| Subject (surface form when different) | Predicate |
|---|---|
|
Islamic astronomy
→
|
introducedConcept |