Islamic Quadrant

Timeline

1. c. 900–1100Baghdad House of Wisdom tradition · IraqIslamic scholars developed portable angle-measuring tools building on Ptolemaic astronomy; the quadrant became widespread in observatories and mosques for its compact structure and ease of measuring altitude angles above the horizon.
2. c. 1261–1270Cairo and Maragha Observatory tradition · EgyptIn the era when Mamluk Egypt and Ilkhanid Persia coexisted, craftsmen and astronomers collaborated to produce brass quadrants for calendar revision, star catalog verification, and navigation training for Indian Ocean merchant ships.
3. c. 1300–1500Indian Ocean–Red Sea–Mediterranean routes · Islamic trade networkThe quadrant spread with Muslim merchant ships and scholars to the East African coast, the west coast of India, and regions bearing the legacy of al-Andalus, becoming an important artifact of cross-civilizational maritime technology exchange.