Theoretically, the shalat time was determined by al Qur'an and Sunnah Through the sun movement phenomenon. Based on the al Qur'an and Sunnah instructions, there are various nash texts as if be incompatible with each other i.e. in determining the beginning of subuh time, nash reveal with some lafal such as, ghalas, isfar, and ishbah. These terms need to define practically in astronomy principle,…