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ŚB 5.21.16

पुरस्तात्सवितुररुण: पश्चाच्च नियुक्त: सौत्ये कर्मणि किलास्ते ॥ १६ ॥
purastāt savitur aruṇaḥ paścāc ca niyuktaḥ sautye karmaṇi kilāste.

Synonyms

purastātin front; savituḥof the sun-god; aruṇaḥthe demigod named Aruṇa; paścātlooking backward; caand; niyuktaḥengaged; sautyeof a charioteer; karmaṇiin the work; kilacertainly; āsteremains.

Translation

Although Aruṇadeva sits in front of the sun-god and is engaged in driving the chariot and controlling the horses, he looks backward toward the sun-god.

Purport

In the Vāyu Purāṇa the position of the horses is described:
saptāśva-rūpa-cchandāṁsī
vahante vāmato ravim
cakra-pakṣa-nibaddhāni
cakre vākṣaḥ samāhitaḥ
Although Aruṇadeva is in the front seat, controlling the horses, he looks back toward the sun-god from his left side.