Tithididhiti 1.31.p1.11

1.31.p1.11

prāgevoktam | iti naktanirṇayaḥ || ayācitasya tu ahorātrasādhyatvādupavāsavadeva nirṇayaḥ
vratādau śuklapratipatpūrvaviddhā grāhyā-pratipaccapyamāvāsyāiti yugmavākyāt | atra yadyapyaviśeṣeṇa pūrvaviddhatvamuktaṃ,
tathāpyaparāhnavyāpinyeva sā pūrvaviddhā grāhyā-pratipatsaṃmukhī
kāryā yā bhavedāparāhnikī-iti skāndavacanāt | atrāparāhnaḥ
pañcadhā vibhaktasyāhnaścaturtho bhāgaḥ | kṛṣṇapratipadaparāhrottarakālapravṛttaśuklapratipacca dvitīyāyutā grāhyā-pratipatsadvitīyā syādvitīyā pratipadyutā-ityāpastambavacanāditi madanaratne
mādhavastvaparāhnavyāptyabhāve'pi sāyāhnavyāpinyā api śuklapratipadaḥ pūrvaviddhāyā eva grāhyatāmāha-tadabhāve tu sāyāhnavyāpinī parigṛhyata iti | upavāse tu pakṣadvaye'pi pratipatpūrvaviddhaiva grāhyā-pratipatpañcamī caiva upodhyā pūrvasaṃyutā-iti madanaratne jābālivacanāt-pratipatpañcamī bhūtaṃ sāvitrī vaṭapūrṇimā
navamī daśamī caiva nopodhyāḥ parasaṃyutā-iti tatraiva brahmavaivartavacanācca | niṣiddhaśca tithyantaravedho yadyapi karmāntara ivopavāse'pi trimuhūrtaparimita eva prāptastathāpi sa upavāsaviṣaye svalpo'pi vedho varjanīyaḥ-ghaṭikārdhaṃ tribhāgaṃ vā svalpaṃ
vā dūṣayettithim | pañcagavyaghaṭaṃ pūrṇa surāyā binduko yathā
iti ṣaṭtriṃśanmatavākyasya-sarvaprakāravedho'yamupavāsasya dūṣakaḥ-iti nigamavākyānurodhenopavāsaviṣayatayā madanaratne
vyākhyānāt | niṣiddhavedharahitatithyalābhe tu ṛṣyaśṛṅgaḥaviddhāni niṣiddhaiścenna labhyante dināni tu | muhūrtaḥ pañcabhirviddhā
grāhyaivaikādaśī tithiḥ | tadardhaviddhānyanyāni dinānyupavasennaraḥ