👤 PersonAl-Biruni973–1048WikipediaWikipedia (es)Wikidata🌍 View on the globeInventions and discoveries · 3c. 980Trigonometry as a disciplineInvention or technique · inventorc. 1025Al-Biruni's measurement of Earth's radiusDiscovery · discovererc. 1030Al-Biruni's specific gravity measurementsDiscovery · discoverer