The seven horses yoked to the sun-god's chariot are named Gayatri, Brhati, Usnik, Jagati, Tristup, Anustup and Pankti. These names of various Vedic meters designate the seven horses that carry the sun-god's chariot

Expressions researched:
"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"

Srimad-Bhagavatam

SB Canto 5

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.

SB 5.21.15, Translation and Purport

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.

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.