Srimad-Bhagavatam: Canto 5 - Chapter 1 - Verse 18

Sanskrit:

तथान्ये च ऋषयो गन्धर्वाप्सरसो नागा ग्रामण्यो यातुधाना देवा इत्येकैकशो गणा: सप्त चतुर्दश मासि मासि भगवन्तं सूर्यमात्मानं नानानामानं पृथङ्‌नानानामान: पृथक्‌कर्मभिर्द्वन्द्वश उपासते ॥ १८ ॥

ITRANS:

tathānye ca ṛṣayo gandharvāpsaraso nāgā grāmaṇyo yātudhānā devā ity ekaikaśo gaṇāḥ sapta caturdaśa māsi māsi bhagavantaṁ sūryam ātmānaṁ nānā-nāmānaṁ pṛthaṅ-nānā-nāmānaḥ pṛthak-karmabhir dvandvaśa upāsate.

Translation:

Similarly, fourteen other saints, Gandharvas, Apsarās, Nāgas, Yakṣas, Rākṣasas and demigods, who are divided into groups of two, assume different names every month and continuously perform different ritualistic ceremonies to worship the Supreme Lord as the most powerful demigod Sūryadeva, who holds many names.

Purport:

In the Viṣṇu Purāṇa it is said: Worshiping the most powerful demigod Sūrya, the Gandharvas sing in front of him, the Apsarās dance before the chariot, the Niśācaras follow the chariot, the Pannagas decorate the chariot, the Yakṣas guard the chariot, and the saints called the Vālikhilyas surround the sun-god and offer prayers. The seven groups of fourteen associates arrange the proper times for regular snow, heat and rain throughout the universe.