{"id":"vidhyamitra:city-day:coimbatore:1981-10-13:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/coimbatore/1981-10-13","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-10-13","date_display":"October 13, 1981 CE","panchanga":{"method":"Sūrya Siddhānta + Bhāskara-II iterative manda + Kerala-school (Mādhava-Nīlakaṇṭha) evection + variation + annual equation","engine_version":"2.0 (Kerala-school enhanced)","accuracy_note":"Sub-degree on Moon at any Kali-Yuga date (~2-5° residual max)","tradition_chain":"Āryabhaṭa(499) → Brahmagupta(628) → Bhāskara II(1150) → Mādhava(~1400) → Parameśvara(1430) → Nīlakaṇṭha(1501) → this","input":{"year":1981,"month":10,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444890.770833,"kali_year":5083,"ahargana":1856425.2708,"sun":{"sidereal_longitude":175.33,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":347.6514,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":15,"name":"Pūrṇimā","paksha":"Śukla","full_name":"Śukla Pūrṇimā","elongation_degrees":172.3214,"elapsed_within_tithi_degrees":4.3214},"nakshatra":{"number":27,"name":"Revatī","pada":1,"moon_longitude":347.6514,"elapsed_within_degrees":0.9847},"yoga":{"number":13,"name":"Vyāghāta","sum_longitude":162.9814},"karana":{"half_tithi_index":28,"name":"Viṣṭi"},"vara":{"number":4,"name":"Maṅgalavāra (Tuesday)"}},"sky":{"method":"Sūrya-Siddhāntic Bhāskara-II 4-step iteration with atan2-based śīghra + varying peripheries + lunar latitude","engine_version":"3.0 (Pūrṇa — complete SS implementation)","tradition_sources":"Āryabhaṭīya 499 CE → SS Ch.1-5 Burgess 1860 → Siddhānta-Śiromaṇi Bhāskara II 1150 → Tantrasaṅgraha Nīlakaṇṭha 1501","input":{"year":1981,"month":10,"day":13,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444890.770833,"ahargana":1856425.2708,"kali_year":5083,"ayanamsa_lahiri":23.5985,"grahas":{"sun":{"sidereal_longitude":176.02325099999996,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":1},"retrograde":false},"moon":{"sidereal_longitude":349.220351,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":1},"retrograde":false,"latitude":-4.228},"mars":{"sidereal_longitude":121.91015099999998,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":1},"retrograde":false},"mercury":{"sidereal_longitude":187.91995099999997,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":1},"retrograde":true},"jupiter":{"sidereal_longitude":177.26345100000003,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":2},"retrograde":false},"venus":{"sidereal_longitude":221.24575099999993,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":169.769951,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":3},"retrograde":false},"rahu":{"sidereal_longitude":97.6554,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":277.6554,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":4},"retrograde":false}},"panchang":{"method":"Sūrya Siddhānta + Bhāskara-II iterative manda + Kerala-school (Mādhava-Nīlakaṇṭha) evection + variation + annual equation","engine_version":"2.0 (Kerala-school enhanced)","accuracy_note":"Sub-degree on Moon at any Kali-Yuga date (~2-5° residual max)","tradition_chain":"Āryabhaṭa(499) → Brahmagupta(628) → Bhāskara II(1150) → Mādhava(~1400) → Parameśvara(1430) → Nīlakaṇṭha(1501) → this","input":{"year":1981,"month":10,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444890.770833,"kali_year":5083,"ahargana":1856425.2708,"sun":{"sidereal_longitude":175.33,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":347.6514,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":15,"name":"Pūrṇimā","paksha":"Śukla","full_name":"Śukla Pūrṇimā","elongation_degrees":172.3214,"elapsed_within_tithi_degrees":4.3214},"nakshatra":{"number":27,"name":"Revatī","pada":1,"moon_longitude":347.6514,"elapsed_within_degrees":0.9847},"yoga":{"number":13,"name":"Vyāghāta","sum_longitude":162.9814},"karana":{"half_tithi_index":28,"name":"Viṣṭi"},"vara":{"number":4,"name":"Maṅgalavāra (Tuesday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-4.228,"elongation":172.321},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-4.228,"opposition_distance":7.679}},"eclipse_window_40days":[]},"city":{"slug":"coimbatore","name":"Coimbatore, Tamil Nadu","lat":11.0168,"lon":76.9558,"tz_offset_hours":5.5,"state":"Tamil Nadu","country":"IN","tier":"tier-1"},"tier2":{"city":{"slug":"coimbatore","name":"Coimbatore, Tamil Nadu","lat":11.0168,"lon":76.9558,"tz_offset_hours":5.5,"state":"Tamil Nadu","country":"IN","tier":"tier-1"},"sunriseLocal":"06:10","sunsetLocal":"18:05","solarNoonLocal":"12:08","dayLengthHours":11.913728634080442,"dayLengthDisplay":"11 Hours 54 Mins 49 Secs","nightLengthDisplay":"12 Hours 05 Mins 11 Secs","moonriseLocal":"17:34","moonsetLocal":"05:47","rahuKala":{"name":"Rāhu Kāla","start":"15:06","end":"16:36","startHours":15.10733833838552,"endHours":16.596554417645574,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"09:09","end":"10:38","startHours":9.1504740213453,"endHours":10.639690100605353,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"12:08","end":"13:37","startHours":12.12890617986541,"endHours":13.618122259125464,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:57","end":"09:21","startHours":8.951911877443958,"endHours":9.34903616524664,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:40","end":"06:59","startHours":6.66844722257854,"endHours":6.986146652820685,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:44","end":"12:32","startHours":11.73178189206273,"endHours":12.526030467668091,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:35","end":"05:23","startHours":4.583544711614463,"endHours":5.377793287219825,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:11","end":"06:10","startHours":5.179231143318485,"endHours":6.172041862825188,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:07","end":"14:55","startHours":14.114527618878817,"endHours":14.90877619448418,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:53","end":"18:17","startHours":17.885770496905632,"endHours":18.28577049690563,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:05","end":"18:35","startHours":18.08577049690563,"endHours":18.582175856658985,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:50","end":"19:35","startHours":17.83577049690563,"endHours":19.58577049690563,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:44","end":"00:32","startHours":23.731781892062727,"endHours":24.526030467668093,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Roga","start":"06:10","end":"07:40","startHours":6.172041862825188,"endHours":7.661257942085244,"quality":"inauspicious"},{"name":"Udveg","start":"07:40","end":"09:09","startHours":7.661257942085244,"endHours":9.1504740213453,"quality":"inauspicious"},{"name":"Chala","start":"09:09","end":"10:38","startHours":9.1504740213453,"endHours":10.639690100605353,"quality":"neutral"},{"name":"Labha","start":"10:38","end":"12:08","startHours":10.639690100605353,"endHours":12.12890617986541,"quality":"auspicious"},{"name":"Amṛta","start":"12:08","end":"13:37","startHours":12.12890617986541,"endHours":13.618122259125464,"quality":"auspicious"},{"name":"Kāla","start":"13:37","end":"15:06","startHours":13.618122259125464,"endHours":15.10733833838552,"quality":"inauspicious"},{"name":"Śubha","start":"15:06","end":"16:36","startHours":15.10733833838552,"endHours":16.596554417645574,"quality":"auspicious"},{"name":"Roga","start":"16:36","end":"18:05","startHours":16.596554417645574,"endHours":18.08577049690563,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Kāla","start":"18:05","end":"19:36","startHours":18.08577049690563,"endHours":19.596554417645578,"quality":"inauspicious"},{"name":"Śubha","start":"19:36","end":"21:06","startHours":19.596554417645578,"endHours":21.10733833838552,"quality":"auspicious"},{"name":"Roga","start":"21:06","end":"22:37","startHours":21.10733833838552,"endHours":22.618122259125464,"quality":"inauspicious"},{"name":"Udveg","start":"22:37","end":"00:08","startHours":22.618122259125464,"endHours":24.12890617986541,"quality":"inauspicious"},{"name":"Chala","start":"00:08","end":"01:38","startHours":24.12890617986541,"endHours":25.639690100605357,"quality":"neutral"},{"name":"Labha","start":"01:38","end":"03:09","startHours":25.639690100605357,"endHours":27.1504740213453,"quality":"auspicious"},{"name":"Amṛta","start":"03:09","end":"04:40","startHours":27.1504740213453,"endHours":28.661257942085243,"quality":"auspicious"},{"name":"Kāla","start":"04:40","end":"06:10","startHours":28.661257942085243,"endHours":30.17204186282519,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"06:10","end":"07:10","startHours":6.172041862825188,"endHours":7.172041862825188,"planetary_lord":"Mars"},{"name":"Hora 2","start":"07:10","end":"08:10","startHours":7.172041862825188,"endHours":8.17204186282519,"planetary_lord":"Jupiter"},{"name":"Hora 3","start":"08:10","end":"09:10","startHours":8.17204186282519,"endHours":9.17204186282519,"planetary_lord":"Saturn"},{"name":"Hora 4","start":"09:10","end":"10:10","startHours":9.17204186282519,"endHours":10.17204186282519,"planetary_lord":"Moon"},{"name":"Hora 5","start":"10:10","end":"11:10","startHours":10.17204186282519,"endHours":11.17204186282519,"planetary_lord":"Mercury"},{"name":"Hora 6","start":"11:10","end":"12:10","startHours":11.17204186282519,"endHours":12.17204186282519,"planetary_lord":"Venus"},{"name":"Hora 7","start":"12:10","end":"13:10","startHours":12.17204186282519,"endHours":13.17204186282519,"planetary_lord":"Sun"},{"name":"Hora 8","start":"13:10","end":"14:10","startHours":13.17204186282519,"endHours":14.17204186282519,"planetary_lord":"Mars"},{"name":"Hora 9","start":"14:10","end":"15:10","startHours":14.17204186282519,"endHours":15.17204186282519,"planetary_lord":"Jupiter"},{"name":"Hora 10","start":"15:10","end":"16:10","startHours":15.17204186282519,"endHours":16.17204186282519,"planetary_lord":"Saturn"},{"name":"Hora 11","start":"16:10","end":"17:10","startHours":16.17204186282519,"endHours":17.17204186282519,"planetary_lord":"Moon"},{"name":"Hora 12","start":"17:10","end":"18:10","startHours":17.17204186282519,"endHours":18.17204186282519,"planetary_lord":"Mercury"},{"name":"Hora 13","start":"18:10","end":"19:10","startHours":18.17204186282519,"endHours":19.17204186282519,"planetary_lord":"Venus"},{"name":"Hora 14","start":"19:10","end":"20:10","startHours":19.17204186282519,"endHours":20.17204186282519,"planetary_lord":"Sun"},{"name":"Hora 15","start":"20:10","end":"21:10","startHours":20.17204186282519,"endHours":21.17204186282519,"planetary_lord":"Mars"},{"name":"Hora 16","start":"21:10","end":"22:10","startHours":21.17204186282519,"endHours":22.17204186282519,"planetary_lord":"Jupiter"},{"name":"Hora 17","start":"22:10","end":"23:10","startHours":22.17204186282519,"endHours":23.17204186282519,"planetary_lord":"Saturn"},{"name":"Hora 18","start":"23:10","end":"00:10","startHours":23.17204186282519,"endHours":24.17204186282519,"planetary_lord":"Moon"},{"name":"Hora 19","start":"00:10","end":"01:10","startHours":24.17204186282519,"endHours":25.17204186282519,"planetary_lord":"Mercury"},{"name":"Hora 20","start":"01:10","end":"02:10","startHours":25.17204186282519,"endHours":26.17204186282519,"planetary_lord":"Venus"},{"name":"Hora 21","start":"02:10","end":"03:10","startHours":26.17204186282519,"endHours":27.17204186282519,"planetary_lord":"Sun"},{"name":"Hora 22","start":"03:10","end":"04:10","startHours":27.17204186282519,"endHours":28.17204186282519,"planetary_lord":"Mars"},{"name":"Hora 23","start":"04:10","end":"05:10","startHours":28.17204186282519,"endHours":29.17204186282519,"planetary_lord":"Jupiter"},{"name":"Hora 24","start":"05:10","end":"06:10","startHours":29.17204186282519,"endHours":30.17204186282519,"planetary_lord":"Saturn"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Rohiṇī","Mṛgaśirā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Citrā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā"],"unfavorable_nakshatras":["Ārdrā","Punarvasu","Puṣya","Aśleṣā","Svātī","Viśākhā","Anurādhā","Jyeṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Vṛṣabha","Siṃha","Kanyā","Dhanu","Makara","Mīna"],"unfavorable_rashis":["Meṣa","Mithuna","Karka","Tulā","Vṛścika","Kumbha"]},"dishaShool":"North (Uttara)","chandraVasa":"South-West","rahuVasa":"North","anandadiYoga":{"name":"Dhvaja","quality":"Auspicious"},"tropicalRitu":"Śarad (Autumn) (tropical)","vedicRitu":"Varṣā (Monsoon)","tropicalAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-7.675487670972242,"eotMinutes":14.442429208075392,"ayanamsa":23.5985}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Āśvina","lunar_month_paksha_full":"Āśvina Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Āśvina","lunar_month_amanta":"Āśvina","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Kanyā (Puraṭṭāsi)","ritu":"Śarad (Autumn)","display_summary":"Āśvina Śukla Pūrṇimā · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"sharad-purnima","name":"Śarad Pūrṇimā / Kojāgarī Pūrṇimā","name_sanskrit":"शरद पूर्णिमा","tradition":"Vaishnava","associated_deity":"Krishna + Lakṣmī","significance":"Krishna's Mahā-rāsa with the gopīs at Vṛndāvana. Lakṣmī wakes (\"ko jāgartti?\")","vrata":true,"primary_observance":"Night-long jāgaraṇa; offering of pāyasa under moonlight","detection":{"tithi_number":15,"tithi_paksha":"Śukla","lunar_month":"Āśvina"},"precedence":2,"sources":["Bhāgavata 10.29-33"]},{"id":"rasa-purnima","name":"Rāsa Pūrṇimā (Vraja Mahā-Rāsa)","name_sanskrit":"रास पूर्णिमा","tradition":"Vaishnava","associated_deity":"Krishna + Gopīs","significance":"Krishna's Mahā-rāsa with the gopīs at Vraja (Bhāgavata 10.29-33). Same as Śarad Pūrṇimā but emphasized in Vraja tradition.","vrata":false,"detection":{"tithi_number":15,"tithi_paksha":"Śukla","lunar_month":"Āśvina"},"precedence":2},{"id":"valmiki-jayanti","name":"Mahārṣi Vālmīki Jayantī","name_sanskrit":"महर्षि वाल्मीकि जयन्ती","tradition":"Pan-Hindu","associated_deity":"Maharṣi Vālmīki (ādi-kavi)","significance":"Composer of Vālmīki Rāmāyaṇa. Āśvina Pūrṇimā tradition.","vrata":false,"detection":{"tithi_number":15,"tithi_paksha":"Śukla","lunar_month":"Āśvina"},"precedence":3}],"todays_walk":{"walk":{"id":"mangala-walk","name":"Maṅgala Walk","name_sanskrit":"मङ्गल यात्रा","type":"graha","description":"Right action + BG 2.31-38 (kṣatriya-dharma).","step_count":7,"url":"/walk/mangala-walk"},"reason":"Maṅgalavāra (Tuesday) — its presiding graha's walk."},"cosmic_resonances":[{"historical_date":"-3137-10-04","event":"Mahābhārata Day 1 (Bhagavad Gītā delivered)","chart_id":"krishna","shared_marker":"same Śukla Pūrṇimā","url":"/day/-3137-10-04","relevance":0.5},{"historical_date":"-0562-04-11","event":"Bhagavān Buddha's birth at Lumbinī","chart_id":"buddha","shared_marker":"same Śukla Pūrṇimā","url":"/day/-0562-04-11","relevance":0.5}]},"validity":{"eternal":false,"location_specific":"coimbatore"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga October 13, 1981 CE · Coimbatore, Tamil Nadu · Vidhyamitra","description":"October 13, 1981 CE for Coimbatore, Tamil Nadu: Śukla Pūrṇimā, sūryodaya 06:10, sūryāsta 18:05.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/coimbatore/1981-10-13","hreflang_alternates":{"en":"https://vidhyamitra.com/city/coimbatore/1981-10-13","sa":"https://sa.vidhyamitra.com/city/coimbatore/1981-10-13","hi":"https://hi.vidhyamitra.com/city/coimbatore/1981-10-13","x-default":"https://vidhyamitra.com/city/coimbatore/1981-10-13"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-02T22:10:27.025Z","verification":{"type":"multi-marker","confidence":"canonical"}},{"pillar":"Vidhyamitra-Tier2","pillar_version":"0.1.0","method":"Spherical astronomy + Lahiri ayanamsa + standard solar declination + EoT correction","retrieved_at":"2026-06-02T22:10:27.025Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-02T22:10:27.025Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}