SB 5.21.15
रथनीडस्तु षट्‌त्रिंशल्लक्षयोजनायतस्तत्तुरीयभागविशालस्तावान् रविरथयुगो यत्र हयाश्छन्दोनामान: सप्तारुणयोजिता वहन्ति देवमादित्यम् ॥ १५ ॥
gāyatrī ca bṛhaty uṣṇig
jagatī triṣṭup eva ca
anuṣṭup paṅktir ity uktāś
chandāṁsi harayo raveḥ
SYNONYMS

ratha-nīḍaḥ—the interior of the chariot; tu—but; ṣaṭ-triṁśat-lakṣa-yojana-āyataḥ—3,600,000 yojanas long; tat-turīya-bhāga—one quarter of that measure (900,000 yojanas); viśālaḥ—having a width; tāvān—so much also; ravi-ratha-yugaḥ—the yoke for the horses; yatra—where; hayāḥ—horses; chandaḥ-nāmānaḥ—having the different names of Vedic meters; sapta—seven; aruṇa-yojitāḥ—hooked up by Aruṇadeva; vahanti—carry; devam—the demigod; ādityam—the sun-god.

TRANSLATION

My dear King, the carriage of the sun-god's chariot is estimated to be 3,600,000 yojanas [28,800,000 miles] long and one-fourth as wide [900,000 yojanas, or 7,200,000 miles]. The chariot's horses, which are named after Gāyatrī and other Vedic meters, are harnessed by Aruṇadeva to a yoke that is also 900,000 yojanas wide. This chariot continuously carries the sun-god.

PURPORT

In the Viṣṇu Purāṇa it is stated:

gāyatrī ca bṛhaty uṣṇig
jagatī triṣṭup eva ca
anuṣṭup paṅktir ity uktāś
chandāṁsi harayo raveḥ
The seven horses yoked to the sun-god's chariot are named Gāyatrī, Bṛhati, Uṣṇik, Jagatī, Triṣṭup, Anuṣṭup and Paṅkti. These names of various Vedic meters designate the seven horses that carry the sun-god's chariot.