Assertion: persian astronomer | /r/CapableOf | work at maragha observatory
Facets:
value: previously
type: TEMPORAL
Source sentences:
text: In 1267, the Persian astronomer Jamal ad-Din, who previously worked at Maragha observatory, presented Kublai Khan with seven Persian astronomical instruments, including a terrestrial globe and an armillary sphere, as well as an astronomical almanac, which was later known in China as the Wannian Li ("Ten Thousand Year Calendar" or "Eternal Calendar").