12-3 (The compiler of the book narrated) that his father - may God be pleased with him - narrated that Ahmad ibn Idris quoted Muhammad ibn Ahmad ibn Yahya ibn Imran al-Ash’ari, on the authority of Al-Hassan ibnMusa al-Khishab, on the authority of Al-Hassan ibn Ishaq al-Tamimy, on the authority of Al-Hassan ibn Akhi al-Zabi, on the authority of Abdullah ibn Sin’an that he had heard Aba Abdullah as-Sadiq (MGB) say, “The shadow will be half of a foot in the middle of the first month of the summer at the beginning of noon. It will be one and a half feet in the middle of the fourth month - Tammuz ; two and a half feet in the middle of the month of Av; three and a half feet in the middle of Elul; five and a half feet in the middle of the first Tishrei; seven and a half feet in the middle of the last Tishrei; five and a half feet in the middle of Shevat, three and a half feet in the middle of Adar, two and a half feet in the middle of Nisan; one and a half feet in the middle of Lyar and half a foot in the middle of the first month of the summer.”