Shatapatha Brahmana 8.4.4.10

8.4.4.10

asminnu haike 'vāntaradeśa upadadhati | asau vā āditya etā amuṃ tadādityametasyāṃ diśi dadhma iti na tathā kuryādanyāni vāva tāni karmāṇi yairetamatra dadhāti

Now some lay down (these bricks) in the intermediate (south-eastern) space of it (the altar), saying, 'This is the sun: we thus place yonder sun in that direction.' Let him not do so: surely there are those other rites by which he places him in that (direction).