पुरस्तात्सवितुररुणः पश्चाच्च नियुक्तः सौत्ये कर्मणि किलास्ते. ॥ १६ ॥
purastat savitur arunah pascac ca niyuktah sautye karmani kilaste.
purastat-in front; savituh-of the sun-god; arunah-the demigod named Aruna; pascat-looking backward; ca-and; niyuktah-engaged; sautye-of a charioteer; karmani-in the work; kila-certainly; aste-remains.
Although Arunadeva 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.
In the Vayu Purana the position of the horses is described:
saptasva-rupa-cchandamsi
vahante vamato ravim
cakra-paksa-nibaddhani
cakre vaksah samahitah
Although Arunadeva is in the front seat, controlling the horses, he looks back toward the sun-god from his left side.