Kaushitakagrihyasutra 2.6.3

2.6.3

bhaikṣairācāryaṃ svastivācya araṇye samitpāṇiḥ sandhyāmupāste nityaṃ vāgyata uttarāparamabhimukho 'nvaṣṭamadeśamardhāstamite maṇḍale ā nakṣatrāṇāṃ darśanāt \ atikrāntāyāṃ mahāvyāhṛtīḥ sāvitrīṃ svastyayanāni ca japitvā \3\

Having made the preceptor say a benediction over the begged food, he always observes the twilight devotion in the forest, with kindling wood in hand, restrained in speech, facing north-west towards the region after the eighth [point], when half the disc [of the sun] has set, until the appearance of the stars; / when it has passed, having muttered the great mystical utterances, the Sāvitrī, and auspicious verses.