Hamdamin, Salih Nabi , Javanpour Heravi, Aziz  , Nowrozi Teymourlouie, Hossein . Time units in the earth's rotation in terms of Fakhr Razi and Abu Rihan Biruni and their influence on the new age. Theological – Doctrinal Research (Islamic Azad University-Saveh Branch). 2025;15(2):65-89. doi: