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));
in this canonical work, there is the description of auspicious moment, constellation etc. to be used on various occasions like initiation etc...
...pavvāvanā sāmāiyārovanam......emāiyā kajjā jesu tihikarana-nakkhatta-muhutta-jogesu ya je jattha karanijjā te jattha'jjhayane vannijjamti tamajjhayanam ganivijjā.
(Nandī 77 Cū p.58)