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Unification of the Islamic calendar was much needed and is a major requirement for Muslims today in the running of worship. Uniformity in to worship and celebrate Islamic holy days is something that has been long awaited. An expectation of the Islamic calendar is determining who has the certainty that a better and more organized for various purposes. However, it is in conflict with a different concept of the new moon from several groups paradigm respectively, both from the perspec tive of science and religion. Hilāl is one of the main sources in the preparation of the I slamic calendar. Currently, the definition of the new moon is very diverse. Which d efinition is used for the initial determination new month of hijriyah, both from the perspective of astronomy or fiqh, or combination of them. Therefore, the article is devoted to the redefinition of the concept of the new moon from the perspective of science and fiqh, that synergy occurs between fiqh and the astronomical new moon to determine new month of Islam. So that the unity of the Islamic calendar can be realized well.