Tithididhiti 1.31.p1.6

1.31.p1.6

ca labhyate tadoktavyavasthāmanādṛtya nakṣatrādiyoga evādaraṇīyaḥyā tithirṛkṣasaṃyuktā yā ca yogena nārada | muhūrttatrayamānāṃ1pi
sāpi sarvā praśasyate | iti | apiśabdo dvitīyo bhinnakramaḥ
sarvāpīti | yā tithirnakṣatrādyanapekṣaiva yasminkarmaṇi vihitā
tasyāmapi yugmādiśāstranirṇītapūrvaviddhaাদিরūpāyāṃ yadi tatkarma
daivānna kṛtaṃ tadavaśyakartavyaṃ ca tadā paraviddhaাদিরūpāmi sā
tithirgauṇakālatvena tasminkarmaṇi svīkartavyā-pratipatsadvitīyā
syādityādiśāstrāṇāṃ pratipadyapyamāvāsyeti śāstrāntarānurodhena
kṛṣṇapratipadyeva tadapravṛttidaśāyāṃ śuklapratipadyapi pravṛtterucitatvāt, bādhakābhāve bādhyasya nirapavādatvāditinyāyasyobhayatra
sāmyāditi mādhavaḥ | iti tithisāmānyanirṇayaparibhāṣā
atha viśeṣeṇa nirṇayaṃ vaktuṃ karmaṇāmavāntarabhedāstatkālāśca kathyante | tatra karmāṇi dvividhāni-daivāni pitryāṇi ca
tatra daivvāni ṣaḍvidhāni-ekabhakta-naktā-'yācito-pavāsavrata-dānarūpāṇi | tatra tadahorātragatadvitīyabhojanābhāvaviśiṣṭamadhyāhnavihitabhojanamekabhaktam | tādṛśameva pradoṣavihitaṃbhojanaṃ
naktam | ayācitaṃ tu tādṛśamevāyācitānnabhojanam-tryahaṃ prātastryahaṃ sāyaṃ tryahamadyādayācitaṃ-iti bṛhaspativacanādityāhuḥ
kecit | tanna | evaṃmasata kadācidyācitānnalābhābhāvenopavāsaprasaktau śiṣṭācāraviruddhavratabhaṅgāpatteḥ, tryahaṃ na kaṃcana yāceteti