Then it decreases every day slightly until it is the day of Ashtad Roz of the month of Ardibahisht Mah, which is the nineteenth of June. On that day, the length of the day reaches its limit; the day is fifteen hours and the night is nine hours. On that day, the sun enters Cancer, summer concludes, and autumn begins. Then it passes the meridian on that day at half a foot, or less or more—if Allah wills—and the beginning of the time for 'Asr on that day is: seven feet and a half, or thereabouts—if Allah wills the Exalted.

This is what I discussed with the Meccans and heard from them regarding the meridian in the year two hundred and twenty-one, twenty-two, or twenty-three, or whatever Allah wills of that.

Chapter: Knowledge of the Stars that Indicate the Direction of the Qibla in Cities

Abu Muhammad Harb ibn Isma'il said: "Allah the Exalted said to His Prophet Muhammad, peace be upon him: 'We have seen the turning of your face toward the heaven, and We will surely turn you to a qibla with which you will be pleased. So turn your face toward the Sacred Mosque, and wherever you are, turn your faces toward it.' The Sacred Ka'ba is the qibla of the people of Islam wherever they are in the world. As for the face of the Ka'ba, the door, and that which is between the Black Stone and the Syrian Corner that is to your right when you face the door of the House, it is the qibla for the people of Basra and its surrounding regions, the people of Ahwaz and its provinces, the people of Fars, the people of Kirman, the people of Qahistan, and the people of Khurasan."