Samarkand astronomical observation tradition

Timeline

1. c. 1390–1400Samarkand · UzbekistanAfter the Timurid Empire made Samarkand its capital, the court began systematically recruiting Persian and Central Asian astronomers, undertaking calendar revision and star catalog verification in the city, laying organizational and scholarly foundations for subsequent large-scale observation facilities.
2. 1420–1430Site of Ulugh Beg Observatory · SamarkandUlugh Beg built a large observatory north of Samarkand, installing giant fixed observation equipment such as a mural quadrant capable of precisely measuring the altitude of celestial bodies, marking a new stage of the tradition's shift from court scholarship to large-scale systematic observation.
3. c. 1437–1449Samarkand · UzbekistanThe observation team completed the Zij-i Jadid-i Sultani star catalog containing coordinates of over a thousand stars, surpassing the earlier Ptolemaic catalog in precision, becoming one of the most outstanding observational achievements in the history of Islamic astronomy, and spreading through manuscripts to the Ottoman Empire and India.