Hisab imkan ru'yat: a unification effort in determining of the begining of months of qamariah

This study attempts to explain the existence of hisâb imkân ru’yat as effort the unification of determination of qamariyah in Indonesia. The condition of difference in determining qamariyah especially Ramadan, Shawwal, and Dzulhijjah is motivation and interest in this writing. Hisâb imkân ru’yat’s method is a method that tries to bridge the two methods the determining of beginning of qamariyah that had existed before the hisâb and ru’yat. The method of hisâb and ru’yat has become a formula be holder Islamic organization Nahdlatul Ulama (NU) and Muhammadiyah. A serious problem is the difference in determining the beginning of the month qamariyah sustainable. Through the method of hisâb imkân ru’yat expected to be a solution to find common ground in determining the beginning of the month qamariyah. In this case the author tries to show that the existence of hisâb imkân ru’yat is important in unification of determining of the beginning of qamariyah following the agreed conditions