He dedicated his work Chronology to Qabus around 1000 and he was still in Gurgan on 19 February 1003 and 14 August 1003 when he observed eclipses of the moon there.
Siya alay-sunod ng kanyang trabaho sa Qabus sa paligid 1000 at siya ay pa rin sa Gurgan sa 19 Peb 1003 at 14 Agosto 1003 kung kailan siya napagmasdan eclipses ng buwan doon.