it is estimated that if it is cloudy for the people on the night of twothirds at the end of shaban then its beginning in shaban is known for its night. and it is known that it remains in it for sixsevenths of an hour from its beginning. then it sets. and that is at the earliest point of its separation from the sun.
والتقدير له أن يكون إذا غم على الناس ليلة ثلثين، فى آخر شعبان، بأن تعرف مستهله فى شعبان لليلته. ويعلم أنه يمكث فيها ستة أسباع ساعة من أولها. ثم يغيب. وذلك فى أدنى مفارقته للشمس.