hijri saal ka aaghaaz kaise huwa?

Hijri Saal Ka Aaghaaz! Islami taqweem (calendar) ki ibteda hijrat e madinah se huwi, yeh aisi taraqqi thi jisey Islami tehzeeb mein badi 'azeem ush shaan aur munfarid ahmiyat haasil huwi, sab se pehle jis hasti ne hijri saal ka aaghaaz kiya wo Sayyiduna Umar bin Khattaab (Razi Allahu Anhu)...