This research discusses the methodology of determining the beginning and end of Ramadan practiced by the Aoliah community. The methodology for determining the beginning and end of Ramadan was actually established by Prophet Muhammad through an authentic hadith stating, "Start fasting when you see the crescent moon and stop fasting when you see the crescent moon, and if it is cloudy, then complete the count of thirty days." This hadith ensures that the methodology for determining the beginning and end of Ramadan is through ru'yatu al hilal or sighting of the crescent moon. However, in practical settings, this hadith becomes biased in the community, with some using the methodology of ru'yatu al hilal, hisab, Whusul Ilallah, and others. One of the methods for determining the beginning and end of the month of Ramadan is through 'calling upon Allah' directly or Whusul Ilallah, as expressed by Ibn Hajar, a leader of the Aoliah community from Gunungkidul, Istima Region, Yogyakarta. This statement sparked controversy in the community. Therefore, in this article, researchers attempt to analyze the method of Whusul Ilallah according to Ibn Hajar as a means of determining the beginning and end of Ramadan. The research methodology in this article employs normative empirical analysis, describing empirical facts and then analyzing them using religious norms in the form of the Quran, hadith, and fiqh related to the determination of the beginning of Ramadan.