A structural scheme attested independently in two Buddhist texts: the 28 are divided into four sevens 'stationed at the gates' of the four directions — Kṛttikā–Aśleṣā (east), Maghā–Viśākhā (south), Anurādhā–Śravaṇā (west), Dhaniṣṭhā–Bharaṇī (north). The Mahāmāyūrī makes each seven the guardian of its quarter. Note the boundaries fall between Aśleṣā/Maghā and between Śravaṇā/Dhaniṣṭhā, i.e. near the old solstitial colures — the same division the Vedāṅga Jyotiṣa's Śraviṣṭhā/Sārpa solstices imply.
चतुर्द्वारिकाणि नक्षत्राणि Catur-dvārikāṇi nakṣatrāṇi
the 28 nakshatras in four gate-groups of seven · — · —
Attestations
T21n1301 at T21.416a13–16: 「厥東方宿,名稱在前、前魚在後。南方宿者,土地在前、善格在後。西方宿者,北魚在前、耳聰在後。北方宿者,貪財在前、長息在後。是為二十八宿。」 (the east's last member and the west's first are corrupt; the south — Maghā first, Viśākhā last — and the north — Dhaniṣṭhā first, Bharaṇī last — match the Sanskrit exactly).
The four-gate scheme already on file from the Śārdūlakarṇāvadāna and the Mahāmāyūrī is confirmed with identical boundaries by a Chinese translation of 230 CE. T1300 marks the four groups of seven inline as it describes them (有此七宿,在於東方 after Liu/Āśleṣā; 有此七宿,在於南方 after Di/Viśākhā; 有斯七宿,在於西方 after Nü/Śravaṇa; 有此七星,在於北方 after Wei/Bharaṇī) and then restates them as first-members. T1301 gives the same by first and last member. The boundaries therefore fall between Āśleṣā/Maghā and between Śravaṇa/Dhaniṣṭhā in both, exactly as in the Sanskrit — i.e. near the old solstitial colures. Note that T1300 assigns Anurādhā (房) to the WEST and T1301 (in a corrupt line) names 北魚 = Uttarāṣāḍhā as the west's first member, which is plainly an error for 悅可 = Anurādhā; T1301's east-group last member is likewise corrupt (前魚 for 不覲). The Chinese Mahāmāyūrī, T19n0982, independently gives the same four groups of seven guarding the four gates in Chinese lodge-names (e.g. T19.437a09–13, the northern seven: 虛星與危星,室星辟星等,奎星及婁星,胃星最居後).