 23) the first thing they count from it is the two horns. they are the first of the levant. the two horns are two planets. it is said that they are the horns of aries. they are called alnatha and alnatha. it is also called alnatih. and between them in the eyes view is a bows length 3 when it is in the middle of the sky. likewise every measure that i mention between two planets is only the distance between them when they circle and are in the middle of the sky. and the planets come close together in the atmosphere of the sky and move apart in the two horizons 4 n.
٢٣) فأول ما يعدون منها الشرطان. وهما أول الشأمية. والشرطان كوكبان. يقال إنهما قرنا الحمل. ويسميان النطح والناطح. ويسمى النطيح أيضا. وبينهما فى رأى العين قاب قوس ٣ إذا صار فى كبد السماء. وكذلك كل مقدار أذكره بين كوكبين فانما مسافة ما بينهما إذا حلقا وصارا فى وسط السماء. والكواكب تتدانى فى جو السماء، وتتباعد فى الافقين ٤ ن.