Śrīmad-Bhāgavatam 5.21.16
పురస్తాత్సవితురరుణ: పశ్చాచ్చ నియుక్త: సౌత్యే కర్మణి కిలాస్తే ॥ ౧౬ ॥
purastāt savitur aruṇaḥ paścāc ca niyuktaḥ sautye karmaṇi kilāste.
[purastaat savitur arunah pashchaach cha niyuktah sautye karmani kilaaste.]
Word-for-word
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.
Blended reading (Sanskrit + English inline)
purastāt savitur aruṇaḥ paścāc ca niyuktaḥ sautye karmaṇi kilāste.
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.
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.
— A.C. Bhaktivedanta Swami Prabhupāda
Gauḍīya Ācāryas
Viśvanātha Cakravartī Ṭhākura
Gauḍīya
Translation
Although Aruṇa 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.
Though seated in form, he faces backwards. Vāyu Purāṇa describes the horses:
saptāśva-rūpa-cchandāṁsi vahante vāmato ravim
cakra-pakṣa-nibaddhāni cakre vākṣaḥ samāhitaḥ
The seven horses are the seven Vedic meters. They carry the sun from the left and are bound to the side of the wheel. The axel is connected with the wheel.
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Source: vedabase.io