Only six. We do not accept that Surya was subordinate to Aditi and this is very evident from the Rig Veda.
1. Mitra, 2. Aryaman, 3. Bhaga, 4. Varuna, 5. Daksa, 6. Amsa
Perhaps this may help you in information about your sect:
"Thus in RigVeda IX, 114, 3, seven Âdityas and seven priests are mentioned together, though the names of the different suns are not given therein. In II, 27 1, Mitra, Aryaman, Bhaga, Varuṇa, Dakṣha and Aṁsha are mentioned by name as so many different Âdityas but the seventh is not named. This omission does not, however, mean much, as the septenary character of the sun is quite patent from the fact that he is called saptâshva (seven-horsed, in V, 45, 9, and his “seven-wheeled” chariot is said to be drawn by “seven bay steeds” (I, 50, 8 ), or by a single horse “with seven names” in I, 164, 2. The Atharva Veda also speaks of “the seven bright rays of the sun” (VII, 107, 1); and the epithet Âditya, as applied to the sun in the Ṛig-Veda, is rendered more clearly by Aditeḥ putrah (Aditi’s son) in A.V. XIII, 2, 9.
Sâyaṇa, following Yâska, derives this sevenfold character of the sun from his seven rays, but why solar rays were taken to be seven still remain unexplained, unless we hold that the Vedic bards had anticipated the discovery of seven prismatic rays or colors, which were unknown even to Yâska or Sâyaṇa. Again though the existence of seven suns may be explained on this hypothesis, yet it fails to account for the death of the eighth sun, for the legend of Aditi (Ṛig. X, 72, 8-9) tells us, “Of the eight sons of Aditi, who were born from her body, she approached the gods with seven and cast out Mârtâṇḍa. With seven sons Aditi approached (the gods) in the former age (pûrvyam yugam); she brought thither Mârtâṇḍa again for birth and death.”* The story is discussed in various places in the Vedic literature and many other attempts, unfortunately all unsatisfactory, have been made to explain it in a rational and intelligent way.
Thus in the Taittirîya Saṁhitâ, VI, 5, 61 ƒ. the story of Aditi cooking a Brahmaudana oblation for the gods, the Sâdhyas, is narrated. The remnant of the oblation was given to her by the gods, and four Âdityas were born to her from it. She then cooked a second oblation and ate it herself first; but the Âditya born from it was an imperfect egg. She cooked a third time and the Âditya Vivasvat, the progenitor of man, was born. But the Saṁhitâ does not give the number and names of the eight Âdityas and this omission is supplied, by the Taittirîya Brâhmaṇa (I, I, 9, I ƒ). The Brâhmaṇa tells us that Aditi cooked the oblation four times and each time the gods gave her the remnant of the oblation. Four pairs of sons were thus born to her; the first pair was Dhâtṛi and Aryaman, the second Mitra and Varuṇa, the third Aṁsha and Bhag and the fourth Indra and Vivasvat. But the Brâhmaṇa does not explain why the eighth son was called Mârtâṇḍa and cast away.
The Taittirîya Araṇyaka, I, 13, 2-3, (cited by Sâyaṇa in his gloss on Ṛig. II, 27, 1, and X, 72, 8) first quotes the two verses from the Ṛig-Veda (X, 72, 8 and 9 which give the legend of Aditi but with a slightly different reading for the second line of the second verse. Thus instead, of tvat punaḥ Mârtâṇḍam â abharat (she brought again Mârtâṇḍa thither for birth and death), the Araṇyaka reads tat parâ Mârtâṇḍam â abharat (she set aside Mârtâṇḍa for birth and death). The Araṇyaka then proceeds to give the names of the eight sons, as Mitra, Varuṇa, Dhâtṛi, Aryaman, Aṁsha, Bhaga, Indra and Vivasvat. But no further explanation is added, nor are we told which of these eight sons represented Mârtâṇḍa. There is, however, another passage in the Âraṇaka (I, 7, 1-6) which throws some light on the nature of these Âdityas.* The names of the suns here given are different. They are: — Aroga, Bhrâja, Patara, Patanga, Svarṇara, Jyotiṣhîmat, Vibhâsa and Kashyapa; the last of which is said to remain, constantly at the great mount Meru, permanently illumining that region. ...
I have not been able to find the Mantra in the existing Saṁhitâs, nor does Sâyaṇa give us any clue to it, butt simply observes “the different features of different seasons cannot be accounted for, except by supposing them to have been caused by different suns; therefore, different suns must exist in different regions.”* But this explanation is open to the objection (actually raised by Vaishampâyana), that we shall have, on this theory, to assume the existence of thousands of suns as the characteristics of the seasons are so numerous. The Âraṇyaka admits, to a certain extent the force of this objection, but says —
aṣhṭau to vyavasitâḥ, meaning that the number eight is settled by the text of the scripture, and there is no further arguing about it.
The Shatapatha Brâhmaṇa, III, 1, 3, 3, explains the legend of Aditi somewhat on the same lines. It says that seven alone of Aditi’s sons are styled
Devâḥ Âdityâḥ (the gods Âdityas) by men, and
that the eighth Mârtâṇḍa was born undeveloped, whereupon the Âditya gods created man and other animals out of him. In two other passages of the Shatapath Brâhmaṇa, VI, 1, 2, 8, and XI, 6, 3, 8, the number of dityas Âis, however, given as twelve. In the first (VI, 1, 2, 8) they are said to have sprung from twelve drops generated by Prâjapati and then placed in different regions (dikṣhu); while in second (XI, 6, 3, 8)* these twelve Âdityas are identified with the twelve months of the year. The number of Âdityas is also given as twelve in the Upanishads: while in the post-Vedic literature they are everywhere said to be twelve, answering to the twelve months of the year."
Quoted from "Arctic Home in Vedas" by Lokmanya Bal Gangadhar Tilak, Chapter VII.