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Śrīmad-Bhāgavatam
[Canto 5, Ch. 21]
thus;  eka-ekaśaḥ —one by one;  gaṇāḥ —groups;  sapta —seven;  catur-daśa —fourteen in number;  māsi māsi —in every month;  bhagavan-tam —unto the most powerful demigod;  sūryam —the sun-god;  āt-mānam —the life of the universe;  nānā —various;  nāmānam —who possesses names;  pṛthak —separate;  nānā-nāmānaḥ —having various names;  pṛthak —separate;  karmabhiḥ —by ritualistic ceremonies;  dvandvaśaḥ —in groups of two;  upāsate —worship.
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:
stuvanti munayaḥ sūryaṁ gandharvair gīyate puraḥ nṛtyanto 'psaraso yānti sūryasyānu niśācarāḥ
vahanti pannagā yakṣaiḥ kriyate 'bhiṣusaṅgrahaḥ vālikhilyās tathaivainaṁ parivārya samāsate
so 'yaṁ sapta-gaṇaḥ sūrya- maṇḍale muni-sattama himoṣṇa vāri-vṛṣṭīṇāṁ hetutve samayaṁ gataḥ
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