observasi hilĀl dengan teleskop inframerah dan kompromi menuju unifikasi kalender hijriyah

This paper intends to offer the thoughts associated with the unification of the Islamic calendar. There are at least two things that need to be done to realize the idea. First, modernize equipment ru’yat al-hilāl based infrared telescopes. This telescope is believed to be able to minimize the obstacles in the implementation of rukyah which have so far happened, like a cloud, the weather, and human error. Second, renders maṭla’ as unifying instrument secured with legal certainty by the government. There are three opinions about matla’, namely maṭla’ global, maṭla’ fī al-wilāyat al-ḥukmi, dan maṭla’ masāfāt al-qaṣr. Maṭla’ fī al-wilāyat al-ḥukmi be one option the most potential to unite the deter­mination of the early months of the Hijriyyah Calender. This effort needs to be done to bridge conflicts that always occurs between the theoretical base (ḥisāb) and empirical base (rukyat) in determining the beginning of the month. This effort is also expected to stimulate the occurrence of compromises between several theories and different groups in the determination of the beginning of the Hijriyyah calender in Indonesia.