 the messenger of god may god bless him and grant him peace used to pray the noon prayer when the sun had declined when it had passed its zenith. the root of the word dahdh is slipping. this is because it continues to rise until it is in the atmosphere of the sky and you see it as if it is standing still for a while then it descends. then it declines and the shadow moves from one side to the other. it is called shade. the messenger of god may god bless him and grant him peace said
وكان رسول الله صلى الله عليه وسلم يصلى الظهر إذا دحضت الشمس ٣ ، إذا زالت وأصل الدحض، الزلق. وذلك أنها لا تزال ترتفع حتى تصير فى جو السماء فتراها كأنها تقف شيئا، ثم تنحط. فحينئذ تزول، ويتحول الظل من جانب الى جانب. ويسمى فيئا. وقال رسول الله صلى الله عليه وسلم