{"id":"vidhyamitra:city-day:howrah:1981-10-13:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/howrah/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":"howrah","name":"Howrah, West Bengal","lat":22.5958,"lon":88.2636,"tz_offset_hours":5.5,"state":"West Bengal","country":"IN","tier":"tier-1"},"tier2":{"city":{"slug":"howrah","name":"Howrah, West Bengal","lat":22.5958,"lon":88.2636,"tz_offset_hours":5.5,"state":"West Bengal","country":"IN","tier":"tier-1"},"sunriseLocal":"05:32","sunsetLocal":"17:13","solarNoonLocal":"11:23","dayLengthHours":11.692823902871748,"dayLengthDisplay":"11 Hours 41 Mins 34 Secs","nightLengthDisplay":"12 Hours 18 Mins 26 Secs","moonriseLocal":"16:44","moonsetLocal":"05:06","rahuKala":{"name":"Rāhu Kāla","start":"14:18","end":"15:46","startHours":14.298258822250013,"endHours":15.75986181010898,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"08:27","end":"09:55","startHours":8.451846870814139,"endHours":9.913449858673108,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"11:23","end":"12:50","startHours":11.375052846532075,"endHours":12.836655834391046,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:15","end":"08:39","startHours":8.256966472432943,"endHours":8.646727269195335,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:01","end":"06:20","startHours":6.015841891049192,"endHours":6.327650528459105,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"10:59","end":"11:46","startHours":10.985292049769685,"endHours":11.764813643294469,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:58","end":"04:45","startHours":3.9695977080466354,"endHours":4.749119301571419,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:33","end":"05:32","startHours":4.554238903190223,"endHours":5.528640895096202,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"13:19","end":"14:06","startHours":13.323856830344035,"endHours":14.103378423868818,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:01","end":"17:25","startHours":17.02146479796795,"endHours":17.42146479796795,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:13","end":"17:43","startHours":17.22146479796795,"endHours":17.70866579392094,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"16:58","end":"18:43","startHours":16.97146479796795,"endHours":18.72146479796795,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"22:59","end":"23:46","startHours":22.985292049769686,"endHours":23.76481364329447,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Roga","start":"05:32","end":"06:59","startHours":5.528640895096202,"endHours":6.99024388295517,"quality":"inauspicious"},{"name":"Udveg","start":"06:59","end":"08:27","startHours":6.99024388295517,"endHours":8.451846870814139,"quality":"inauspicious"},{"name":"Chala","start":"08:27","end":"09:55","startHours":8.451846870814139,"endHours":9.913449858673108,"quality":"neutral"},{"name":"Labha","start":"09:55","end":"11:23","startHours":9.913449858673108,"endHours":11.375052846532075,"quality":"auspicious"},{"name":"Amṛta","start":"11:23","end":"12:50","startHours":11.375052846532075,"endHours":12.836655834391046,"quality":"auspicious"},{"name":"Kāla","start":"12:50","end":"14:18","startHours":12.836655834391046,"endHours":14.298258822250013,"quality":"inauspicious"},{"name":"Śubha","start":"14:18","end":"15:46","startHours":14.298258822250013,"endHours":15.75986181010898,"quality":"auspicious"},{"name":"Roga","start":"15:46","end":"17:13","startHours":15.75986181010898,"endHours":17.22146479796795,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Kāla","start":"17:13","end":"18:46","startHours":17.22146479796795,"endHours":18.759861810108983,"quality":"inauspicious"},{"name":"Śubha","start":"18:46","end":"20:18","startHours":18.759861810108983,"endHours":20.298258822250013,"quality":"auspicious"},{"name":"Roga","start":"20:18","end":"21:50","startHours":20.298258822250013,"endHours":21.836655834391046,"quality":"inauspicious"},{"name":"Udveg","start":"21:50","end":"23:23","startHours":21.836655834391046,"endHours":23.37505284653208,"quality":"inauspicious"},{"name":"Chala","start":"23:23","end":"00:55","startHours":23.37505284653208,"endHours":24.913449858673108,"quality":"neutral"},{"name":"Labha","start":"00:55","end":"02:27","startHours":24.913449858673108,"endHours":26.45184687081414,"quality":"auspicious"},{"name":"Amṛta","start":"02:27","end":"03:59","startHours":26.45184687081414,"endHours":27.99024388295517,"quality":"auspicious"},{"name":"Kāla","start":"03:59","end":"05:32","startHours":27.99024388295517,"endHours":29.528640895096203,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"05:32","end":"06:32","startHours":5.528640895096202,"endHours":6.528640895096202,"planetary_lord":"Mars"},{"name":"Hora 2","start":"06:32","end":"07:32","startHours":6.528640895096202,"endHours":7.528640895096202,"planetary_lord":"Jupiter"},{"name":"Hora 3","start":"07:32","end":"08:32","startHours":7.528640895096202,"endHours":8.528640895096203,"planetary_lord":"Saturn"},{"name":"Hora 4","start":"08:32","end":"09:32","startHours":8.528640895096203,"endHours":9.528640895096203,"planetary_lord":"Moon"},{"name":"Hora 5","start":"09:32","end":"10:32","startHours":9.528640895096203,"endHours":10.528640895096203,"planetary_lord":"Mercury"},{"name":"Hora 6","start":"10:32","end":"11:32","startHours":10.528640895096203,"endHours":11.528640895096203,"planetary_lord":"Venus"},{"name":"Hora 7","start":"11:32","end":"12:32","startHours":11.528640895096203,"endHours":12.528640895096203,"planetary_lord":"Sun"},{"name":"Hora 8","start":"12:32","end":"13:32","startHours":12.528640895096203,"endHours":13.528640895096203,"planetary_lord":"Mars"},{"name":"Hora 9","start":"13:32","end":"14:32","startHours":13.528640895096203,"endHours":14.528640895096203,"planetary_lord":"Jupiter"},{"name":"Hora 10","start":"14:32","end":"15:32","startHours":14.528640895096203,"endHours":15.528640895096203,"planetary_lord":"Saturn"},{"name":"Hora 11","start":"15:32","end":"16:32","startHours":15.528640895096203,"endHours":16.528640895096203,"planetary_lord":"Moon"},{"name":"Hora 12","start":"16:32","end":"17:32","startHours":16.528640895096203,"endHours":17.528640895096203,"planetary_lord":"Mercury"},{"name":"Hora 13","start":"17:32","end":"18:32","startHours":17.528640895096203,"endHours":18.528640895096203,"planetary_lord":"Venus"},{"name":"Hora 14","start":"18:32","end":"19:32","startHours":18.528640895096203,"endHours":19.528640895096203,"planetary_lord":"Sun"},{"name":"Hora 15","start":"19:32","end":"20:32","startHours":19.528640895096203,"endHours":20.528640895096203,"planetary_lord":"Mars"},{"name":"Hora 16","start":"20:32","end":"21:32","startHours":20.528640895096203,"endHours":21.528640895096203,"planetary_lord":"Jupiter"},{"name":"Hora 17","start":"21:32","end":"22:32","startHours":21.528640895096203,"endHours":22.528640895096203,"planetary_lord":"Saturn"},{"name":"Hora 18","start":"22:32","end":"23:32","startHours":22.528640895096203,"endHours":23.528640895096203,"planetary_lord":"Moon"},{"name":"Hora 19","start":"23:32","end":"00:32","startHours":23.528640895096203,"endHours":24.528640895096203,"planetary_lord":"Mercury"},{"name":"Hora 20","start":"00:32","end":"01:32","startHours":24.528640895096203,"endHours":25.528640895096203,"planetary_lord":"Venus"},{"name":"Hora 21","start":"01:32","end":"02:32","startHours":25.528640895096203,"endHours":26.528640895096203,"planetary_lord":"Sun"},{"name":"Hora 22","start":"02:32","end":"03:32","startHours":26.528640895096203,"endHours":27.528640895096203,"planetary_lord":"Mars"},{"name":"Hora 23","start":"03:32","end":"04:32","startHours":27.528640895096203,"endHours":28.528640895096203,"planetary_lord":"Jupiter"},{"name":"Hora 24","start":"04:32","end":"05:32","startHours":28.528640895096203,"endHours":29.528640895096203,"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"},"drikRitu":"Śarad (Autumn) (Drik)","vedicRitu":"Varṣā (Monsoon)","drikAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","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","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},{"id":"kanya-sankranti","name":"Kanyā Saṅkrānti (Mahālaya begins)","name_sanskrit":"कन्या सङ्क्रान्ति","tradition":"Pan-Hindu","significance":"Sun enters Virgo; Mahālaya / Pitṛ-Pakṣa solar marker.","vrata":false,"detection":{"sun_rashi":"Kanyā"},"precedence":4}],"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":"howrah"},"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 · Howrah, West Bengal · Vidhyamitra","description":"October 13, 1981 CE for Howrah, West Bengal: Śukla Pūrṇimā, sūryodaya 05:32, sūryāsta 17:13.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/howrah/1981-10-13","hreflang_alternates":{"en":"https://vidhyamitra.com/city/howrah/1981-10-13","sa":"https://sa.vidhyamitra.com/city/howrah/1981-10-13","hi":"https://hi.vidhyamitra.com/city/howrah/1981-10-13","x-default":"https://vidhyamitra.com/city/howrah/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":"2026-05-20T02:11:36.674Z","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":"2026-05-20T02:11:36.674Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-20T02:11:36.674Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}