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Islamic Astrolabes and Observatories

Type Object Region Middle East Time 1001–1200

In the 11th century the Islamic world achieved breakthroughs in precision astrolabe manufacture and large-scale observatory observation;…

Timeline

  1. 1000–1070Khorasan and Persia · IranIslamic craftsmen and scholars improved the scale precision and multifunctional plate design of the astrolabe; al-Biruni and others systematically expounded the principles of astrolabe construction and astronomical measurement methods in the early 11th century, making the astrolabe one of the most widely disseminated scientific instruments in the Islamic world.
  2. 1074–1080Isfahan · IsfahanSeljuk Sultan Malik-Shah I ordered the construction of a large observatory in Isfahan, appointing Omar Khayyam to lead calendar reform, systematically observing stellar positions and compiling the Jalali calendar, representing the highest level of institutionalized astronomical research in the 11th-century Islamic world.
  3. c. 1079Isfahan · IsfahanThe Isfahan Observatory team completed the compilation of the Jalali calendar and promulgated it throughout the empire; the calendar is renowned for a tropical year length of 365.24219858156 days, surpassing the precision of the European precursor to the Gregorian calendar, and became the foundation of the Persian calendar, still in use today.

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