Suryasiddhanta 3.7

3.7

tasmiṃścaturasre pūrvāpararekhāta uttarabhāge viṣuvadbhāgragākṣabhāgrapradeśasyākṣabhāṅgulāntaritetyarthaḥ | prācyaparā rekhā pūrvāpararekhānukārā rekhā tathā sarvatastulyāntareṇa yatheṣṭacchāyāgrarekhābhujāntareṇa tathākṣabhāntareṇa kāryā | antaramiṣṭacchāyāviṣuvatoriṣṭacchāyāgrarekhākṣabhāgrarekhayorityarthaḥ | madhyaṃ caturasre'ṅgulātmakamantarālaṃ sarvatastulyam | agrākarṇavṛttāgrocyate | atropapattiḥ| bhujasya karṇavṛttāgrā palabhāsaṃskāreṇāgra uktatvāddakṣiṇagole palabhādhikottarabhujasadbhāvena palabhono bhujo'greti prācyaparasūtrāduttarabhāge'kṣabhāgrarekhā bhujamadhye bhavatīti dvayo rekhayorantaramagrā palabhonabhujarūpā | evamuttaragola uttarabhujasya palabhālpatvādbhujonapalabhāgreti palabhārekhā prācyaparasūtrāduttarabhāgasthā bhujarekhāto'pyagrāntareṇottaradiggīti dvayo rekhayorantaraṃ bhujonapalabhārūpaṃ karṇavṛttāgrā | evaṃ dakṣiṇabhujasya palabhonāgrātvāt palabhāyuto bhujo'greti prācyaparasūtrādbhujāgrapalabhāgrarekhayoḥ krameṇa yāmyottaratvāt tayorantarālaṃ palabhābhujaikyarūpamagrā palabhāyāḥ śaṅkutalānukalpatvāt sadottaratvaṃ chāyāsamvandhādyuktam | gole śaṅkutalasya dakṣiṇatvādgrahāparadiśi chāyāsadbhāvācca | ata eva prācyaparasūtrāddakṣiṇabhāge dakṣiṇabhujavaśādakṣabhāgrarekhākalpana uktānutpattyā samyaguttarabhāge pūrvāparasūtrāditi viṣuvadbhāgragetyatra vyākhyātam |
atha prasaṅgājjñātacchāyātaḥ karṇajñānaṃ tacchuddhiṃ cāha |