Since al-Khujandi died in 1000, we can be fairly certain that al-Biruni spent part of the time between 995 and 997 at Rayy.
Since al-Khujandi namatay sa 1000, kami ay maaaring medyo tiyak na al-Biruni nagastos bahagi ng oras sa pagitan ng 995 at 997 sa Rayy.