Prayer Times
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 33
وَ سَأَلَهُ سَمَاعَةُ بْنُ مِهْرَانَ: عَنِ اَلصَّلاَةِ بِاللَّيْلِ وَ اَلنَّهَارِ إِذَا لَمْ تُرَ اَلشَّمْسُ وَ اَلْقَمَرُ وَ لاَ اَلنُّجُومُ فَقَالَ «تَجْتَهِدُ رَأْيَكَ وَ تَعَمَّدُ اَلْقِبْلَةَ بِجُهْدِكَ.
Sama’a ibn Mehran asked Him about praying during the day or night when neither the sun, the moon, nor the stars are visible. Imam عليه السلام replied: "You exert your own judgment and strive to determine the Qiblah (direction of prayer) to the best of your ability."
- Ṣaḥīḥ al-Faqīh