Vairocanābhisaṃbodhi Sūtra in the context of Tendai

Prajñāpāramitā Devī (Sanskrit: प्रज्ञापारमिता देवी, lit. 'Perfection of Wisdom Goddess'; Tibetan: ཤེས་རབ་ཀྱི་ཕ་རོལ་ཏུ་ཕྱིན་མ, abbr. ཤེར་ཕྱིན་མ, Wylie: shes rab kyi pa rol tu chin ma abbr. sher chin ma) is a female Buddha that symbolizes and embodies Prajñāpāramitā, the perfection of transcendent wisdom. This is the highest kind of wisdom in Mahayana and Vajrayana, which leads to Buddhahood and is the spontaneous source of Buddhahood. This is the essence of the Prajñāpāramitā sutras of which there are thousands. As such, Prajñāpāramitā Devī is a samboghakaya Buddha, and is known as "Mother of Buddhas" (Sanskrit: बुद्धमातृ, romanized: Buddhamātṛ) or "The Great Mother" (Tibetan: ཡུམ་ཆེན་མོ, Wylie: Yum chen mo).

She is a central figure in Vajrayana and appears in various sutra and tantra Buddhist sources, like the Heart Sutra, Sādhanamāla, Niṣpannayogāvali, the Caṇḍamahāroṣaṇa tantra, Dhāranisamuccaya, Mañjusrimūlakalpa, and the Vairocanābhisaṃbodhi Sūtra.

Yixing (Chinese: 一行; pinyin: Yīxíng; Wade–Giles: I-Hsing, 683–727) was a Buddhist monk of the Tang dynasty, recognized for his accomplishments as an astronomer, a reformer of the calendar system, a specialist in the Yijing (易經), and a distinguished Buddhist figure with expertise in Esoteric Buddhism.

In the realm of secular affairs, Yixing gained prominence for his reforms to the imperial calendar and his construction of a celestial globe featuring a liquid-driven escapement, the first in a long tradition of Chinese astronomical clockworks. Within Buddhist circles, he is particularly remembered for his contributions to the translation of the Mahāvairocana-sūtra and for authoring the authoritative commentary on that scripture, the Darijing shu 大日經疏 (T 1796). Due to his significant activities in both religious and secular spheres, a legendary portrayal of Yixing as a master astrologer and practitioner of astral magic developed during the late Tang period, leading to the attribution of several astrological works to him.