Unified Islamic calendar in the perspective of Islamic legal philosophy

Abstract

This paper discusses the principles of unified Islamic calendar in the perspective of Usūl al-Fiqh. It answers questions about the possibility of applying the theory of maqāsid al-syarī'ah in unifying the Islamic calendar and whether ru'yat al-hilāl is the purpose of the shariah since it is legally stated by the Prophet. Since the unification of the Islamic calendar necessities al-hisāb al-falaky, is it allowed to not performing ru'yat al-hilāl? The author also discusses some concepts on unifying Islamic calendar as well as compares between Turkey and Morocco calendars.