▁the ▁book , ▁N iz ami ▁discuss es ▁the ▁philosoph ical ▁or ▁religious ▁ide ology ▁of ▁the ▁creation ▁of ▁the ▁world ▁and ▁the ▁order ▁of ▁things . ▁While ▁he ▁was ▁primarily ▁a ▁court ier , ▁he ▁noted ▁in ▁his ▁book ▁that ▁he ▁was ▁an ▁astronom er ▁and ▁phys ician ▁as ▁well .< ref > N iz ami ▁A ru zi , ▁A ▁Re vised ▁Trans lation ▁of ▁the ▁Ch ah ár ▁ma q á la ▁(" F our ▁disc ourses "), ▁x i , ▁ 7 4 , ▁ 9 6 .</ ref > ▁ ▁He ▁reports ▁in ▁the ▁work ▁that ▁he ▁spent ▁time ▁not ▁only ▁in ▁his ▁native ▁Sam ar q and , ▁but ▁also ▁in ▁Her at , ▁T us ▁( where ▁he ▁visited ▁Ferd ow si ' s ▁tomb ▁and ▁gathered ▁material ▁on ▁the ▁great ▁poet ), ▁B alk h , ▁and ▁N ish ap ur , ▁where ▁he ▁lived ▁for ▁perhaps ▁five ▁years . ▁He ▁also ▁claimed ▁to ▁have ▁studied ▁under ▁the ▁astronom er - po et ▁O mar ▁Kh ay y ám , ▁a ▁native ▁of ▁N ish ap ur . ▁ ▁In ▁the ▁introduction ▁to ▁the ▁Ch ah ar ▁Ma q ala , ▁A ru zi ▁elabor ates ▁on ▁issues ▁of ▁Natural ▁Science , ▁ep ist em ology ▁and ▁politics . ▁An ▁ident ifying ▁feature ▁of ▁N iz ám í - i ' Ar ú d í ’ s ▁writing ▁is ▁the ▁pre face , ▁" On ▁Cos m ography ", ▁is ▁the ▁extensive ▁use ▁of ▁double