Tithididhiti 1.31.p1.3

1.31.p1.3

kṣayaḥ | kharvadarpau cedvartete paraviddhā tithirgrāhyā | kṣaye pūrvaviddhetyarthaḥ | yadyapi yugmādivākye kharvādivākye ca karmaviśeṣo
nopāttastathāpi-dvitīyādikayugmānāṃ pūjyatā niyamādiṣu
ekoddiṣṭādivṛddhyādau hrāsavṛddhyādicodanā-iti niyamavacanādaivapitryaviṣayatvena vyavasthā labhyate-niyamādiṣviti sakaladaivopādānāt, ekoddiṣṭādīti sakalapitryopādānāt | ekoddiṣṭādisaṃbanthitivervṛddhyādāviti ṣaṣṭhīsamāsābhiprāyaḥ | karmāṅgatitheryattithivedhena grāhyatā varjanīyatā vā saṃpadyate tasya vedhakatitheḥ
kiyatparimāṇaṃ vedhamapekṣata ityapekṣāyāṃ paiṭhīnasiḥ-pakṣadvaye'pi
tithayastithiṃ pūrvā tathottarām | tribhirmuhūrtairvidhyanti sāmānyo'yaṃ vidhiḥ smṛtaḥ | iti tribhireveti niyamena tannyūnaghaṭikādiparimitatithyantarayoge'pi na grāhyatādiprayojakavedhasiddhiriti jñāpyate | varjanaprayojakavedhakatithiviśeṣe etadapavādaḥnāgo dvādaśanāḍībhirdikpañcadaśabhistathā | bhūto'ṣṭādaśanāḍībhirdūṣayatyuttarāṃ tithim | iti | atraca yatra skandavratasāvitrīvratādau ṣaṣṭhyāditithiḥ pūrvaviddhā vihitā tatrāpyuktaparimāṇapūrvatithivedhadoṣe pūrvaviddhā na grāhyeti kecit | anye tvāhuḥevaṃ sati vedhaviśiṣṭadūṣyatāvidhau gauravāpatteryathoktavratātiriktavrateṣūttaraviddhāniyamātpūrvaviddhāyā duṣṭatvamarthātsiddham | tatra
pūrvasyāstitheḥ prāptadūṣakatānuvādena parimāṇaviśeṣamātravidhau
lāghavamiti skandavratasāvitrīvratādivyatiriktavratamuktaparimāṇavedhe sati pūrvaviddhāyāṃ na kartavyaṃ tāvatparimāṇanyūnavedhe tu
pūrvaviddhāyāṃ kartavyamiti | anyānapi vedhaprakārāṃstattatprakaraṇe