Tiedämme, että al-Biruni siirretty noin usein tänä aikana, jota 1000 hän oli Gurgan tukee Qabus, ruler, Ziyarid tilassa. ###>We know that al-Biruni moved around frequently during this period for by 1000 he was at Gurgan being supported by Qabus, the ruler of the Ziyarid state.