TantraS, 6, 13.0 tatra dinaṃ kṛṣṇapakṣaḥ rātriḥ śuklaḥ tatra pūrvaṃ tuṭyardham antyaṃ ca tuṭyardhaṃ viśrāntiḥ akālakalitāḥ madhyās tu pañcadaśa tuṭaya eva tithayaḥ tatra prakāśo viśrāntiś ca iti ete eva dinaniśe //