SB 5.21.16
पुरस्तात्सवितुररुण: पश्चाच्च नियुक्त: सौत्ये कर्मणि किलास्ते ॥ १६ ॥
saptāśva-rūpa-cchandāṁsī
vahante vāmato ravim
cakra-pakṣa-nibaddhāni
cakre vākṣaḥ samāhitaḥ
SYNONYMS

purastāt—in front; savituḥ—of the sun-god; aruṇaḥ—the demigod named Aruṇa; paścāt—looking backward; ca—and; niyuktaḥ—engaged; sautye—of a charioteer; karmaṇi—in the work; kila—certainly; āste—remains.

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.