A kind of Utkālika Śruta (a category of Āgamas (canonical works), which is allowed to be studied at all time barring the akāla prahara (i.e., the period in which the study of Āgamas is prohibited));
the chapter (treatise) of canonical text which contains the description of the life-span, mansions (abodes), Vimānas (habitats) cities, the rate of breathing etc. of the Devendras (kings of Empyrean / Luminous gods).
(Nandī 77)