A kind of Kālika Śruta (a category of Āgama (2) (canonical work) which can be studied only in the first and last quarter of day and night);
in which the description of a god named Aruṇa is found and on reciting which, the god Aruṇa himself becomes manifestly present.
aruṇo nāma devaḥ tadvaktavyatāpratipadako yo granthaḥ parāvaitryamānaśca tadupapatahetuḥ so'ruṇopapātaḥ.
(Nandī 78 MaVṛ Pa 206)