The Holy Quran has given importance to the movement of the moon and the stages it passes through and has made it a standard for people's chronology. Some Islamic acts and worships, such as Hajj and fasting, are dependent on the recognition of the crescent moon, and the confirmation of the first and last lunar months is important in this regard.
Based on the differences in jurisprudential and scientific foundations, there have been differences in the methods of confirming the first of the month (despite the similarities that exist). There are also narrations that show that the difference in the first of the month and the lack of understanding of the virtues of the month of Ramadan occur due to the punishment of oppression against the Ahlul Bayt, and especially Imam Hussein (peace be upon him). In fact, the situational effect of oppression against the Ahlul Bayt (peace be upon him) and their dissatisfaction have led to the intensification of differences and the deprivation of these virtues even more.
During the period of the major occultation, the authority of the jurist and the authority of the marja' have been considered a way out of disputes and a way to achieve religious duties. By examining the Quranic evidence, narrations, and other analyses, solutions can be presented to respond to disputes in this regard. In any case, these disputes between scholars and authorities of taqlid do not arise from personal and non-scientific motives.