Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 27-28

Sanskrit:

श्रीशौनक उवाचशुको यदाह भगवान् विष्णुराताय श‍ृण्वते ।सौरो गणो मासि मासि नाना वसति सप्तक: ॥ २७ ॥तेषां नामानि कर्माणि नियुक्तानामधीश्वरै: ।ब्रूहि न: श्रद्दधानानां व्यूहं सूर्यात्मनो हरे: ॥ २८ ॥

ITRANS:

śrī-śaunaka uvācaśuko yad āha bhagavānviṣṇu-rātāya śṛṇvatesauro gaṇo māsi māsinānā vasati saptakaḥ

Translation:

Śrī Śaunaka said: Please describe to us, who have great faith in your words, the different sets of seven personal features and associates the sun-god exhibits during each month, along with their names and activities. The associates of the sun-god, who serve their lord, are personal expansions of the Supreme Personality of Godhead Hari in His feature as the presiding deity of the sun.

Purport:

After hearing an account of the exalted conversation between Śukadeva Gosvāmī and Mahārāja Parīkṣit, Śaunaka now inquires about the sun as the expansion of the Supreme Lord. Although the sun is the king of all planets, Śrī Śaunaka is specifically interested in this effulgent globe as the expansion of Śrī Hari, the Supreme Personality of Godhead. The personalities related with the sun are of seven categories. In the course of the sun’s orbit there are twelve months, and in each month a different sun-god and a different set of his six associates preside. In each of the twelve months beginning from Vaiśākha there are different names for the sun-god himself, the sage, the Yakṣa, the Gandharva, the Apsarā, the Rākṣasa and the Nāga, making a total of seven categories.