{"id":"vidhyamitra:city-day:erode:1981-09-17:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/erode/1981-09-17","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-09-17","date_display":"September 17, 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":9,"day":17,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444864.770833,"kali_year":5083,"ahargana":1856399.2708,"sun":{"sidereal_longitude":149.7855,"rashi":5,"rashi_name":"Siṃha"},"moon":{"sidereal_longitude":6.8633,"rashi":1,"rashi_name":"Meṣa"},"tithi":{"number":19,"name":"Caturthī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Caturthī","elongation_degrees":217.0778,"elapsed_within_tithi_degrees":1.0778},"nakshatra":{"number":1,"name":"Aśvinī","pada":3,"moon_longitude":6.8633,"elapsed_within_degrees":6.8633},"yoga":{"number":12,"name":"Dhruva","sum_longitude":156.6487},"karana":{"half_tithi_index":36,"name":"Bava"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"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":9,"day":17,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444864.770833,"ahargana":1856399.2708,"kali_year":5083,"ayanamsa_lahiri":23.5975,"grahas":{"sun":{"sidereal_longitude":150.47234400000002,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":2},"retrograde":false},"moon":{"sidereal_longitude":9.700844000000018,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":3},"retrograde":false,"latitude":-4.4968},"mars":{"sidereal_longitude":106.074544,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":176.10814400000004,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":1},"retrograde":false},"jupiter":{"sidereal_longitude":171.66874400000006,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":4},"retrograde":false},"venus":{"sidereal_longitude":191.44334400000002,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":166.60174400000005,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":false},"rahu":{"sidereal_longitude":99.033,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":279.033,"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":9,"day":17,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444864.770833,"kali_year":5083,"ahargana":1856399.2708,"sun":{"sidereal_longitude":149.7855,"rashi":5,"rashi_name":"Siṃha"},"moon":{"sidereal_longitude":6.8633,"rashi":1,"rashi_name":"Meṣa"},"tithi":{"number":19,"name":"Caturthī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Caturthī","elongation_degrees":217.0778,"elapsed_within_tithi_degrees":1.0778},"nakshatra":{"number":1,"name":"Aśvinī","pada":3,"moon_longitude":6.8633,"elapsed_within_degrees":6.8633},"yoga":{"number":12,"name":"Dhruva","sum_longitude":156.6487},"karana":{"half_tithi_index":36,"name":"Bava"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-4.497,"elongation":142.922},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-4.497,"opposition_distance":37.078}},"eclipse_window_40days":[]},"city":{"slug":"erode","name":"Erode, Tamil Nadu","lat":11.341,"lon":77.7172,"tz_offset_hours":5.5,"state":"Tamil Nadu","country":"IN","tier":"tier-1"},"tier2":{"city":{"slug":"erode","name":"Erode, Tamil Nadu","lat":11.341,"lon":77.7172,"tz_offset_hours":5.5,"state":"Tamil Nadu","country":"IN","tier":"tier-1"},"sunriseLocal":"06:08","sunsetLocal":"18:18","solarNoonLocal":"12:13","dayLengthHours":12.176400412149134,"dayLengthDisplay":"12 Hours 10 Mins 35 Secs","nightLengthDisplay":"11 Hours 49 Mins 25 Secs","moonriseLocal":"20:37","moonsetLocal":"09:03","rahuKala":{"name":"Rāhu Kāla","start":"13:44","end":"15:16","startHours":13.736910655595846,"endHours":15.258960707114486,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"06:08","end":"07:39","startHours":6.126660398002636,"endHours":7.648710449521278,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"09:10","end":"10:42","startHours":9.17076050103992,"endHours":10.692810552558562,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:58","end":"09:22","startHours":8.967820494170768,"endHours":9.373700507909072,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:38","end":"06:58","startHours":6.634010415175517,"endHours":6.958714426166161,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:49","end":"12:37","startHours":11.808980590338898,"endHours":12.620740617815507,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:30","end":"05:19","startHours":4.503140343049418,"endHours":5.314900370526027,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:07","end":"06:08","startHours":5.111960363656875,"endHours":6.126660398002636,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:15","end":"15:03","startHours":14.244260672768725,"endHours":15.056020700245334,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:06","end":"18:30","startHours":18.10306081015177,"endHours":18.50306081015177,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:18","end":"18:49","startHours":18.30306081015177,"endHours":18.81041082732465,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:03","end":"19:48","startHours":18.05306081015177,"endHours":19.80306081015177,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:49","end":"00:37","startHours":23.808980590338898,"endHours":24.620740617815507,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Śubha","start":"06:08","end":"07:39","startHours":6.126660398002636,"endHours":7.648710449521278,"quality":"auspicious"},{"name":"Roga","start":"07:39","end":"09:10","startHours":7.648710449521278,"endHours":9.17076050103992,"quality":"inauspicious"},{"name":"Udveg","start":"09:10","end":"10:42","startHours":9.17076050103992,"endHours":10.692810552558562,"quality":"inauspicious"},{"name":"Chala","start":"10:42","end":"12:13","startHours":10.692810552558562,"endHours":12.214860604077202,"quality":"neutral"},{"name":"Labha","start":"12:13","end":"13:44","startHours":12.214860604077202,"endHours":13.736910655595846,"quality":"auspicious"},{"name":"Amṛta","start":"13:44","end":"15:16","startHours":13.736910655595846,"endHours":15.258960707114486,"quality":"auspicious"},{"name":"Kāla","start":"15:16","end":"16:47","startHours":15.258960707114486,"endHours":16.78101075863313,"quality":"inauspicious"},{"name":"Śubha","start":"16:47","end":"18:18","startHours":16.78101075863313,"endHours":18.30306081015177,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Amṛta","start":"18:18","end":"19:47","startHours":18.30306081015177,"endHours":19.78101075863313,"quality":"auspicious"},{"name":"Kāla","start":"19:47","end":"21:16","startHours":19.78101075863313,"endHours":21.258960707114486,"quality":"inauspicious"},{"name":"Śubha","start":"21:16","end":"22:44","startHours":21.258960707114486,"endHours":22.736910655595846,"quality":"auspicious"},{"name":"Roga","start":"22:44","end":"00:13","startHours":22.736910655595846,"endHours":24.214860604077202,"quality":"inauspicious"},{"name":"Udveg","start":"00:13","end":"01:42","startHours":24.214860604077202,"endHours":25.692810552558562,"quality":"inauspicious"},{"name":"Chala","start":"01:42","end":"03:10","startHours":25.692810552558562,"endHours":27.170760501039922,"quality":"neutral"},{"name":"Labha","start":"03:10","end":"04:39","startHours":27.170760501039922,"endHours":28.64871044952128,"quality":"auspicious"},{"name":"Amṛta","start":"04:39","end":"06:08","startHours":28.64871044952128,"endHours":30.126660398002635,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"06:08","end":"07:08","startHours":6.126660398002636,"endHours":7.126660398002636,"planetary_lord":"Jupiter"},{"name":"Hora 2","start":"07:08","end":"08:08","startHours":7.126660398002636,"endHours":8.126660398002636,"planetary_lord":"Saturn"},{"name":"Hora 3","start":"08:08","end":"09:08","startHours":8.126660398002636,"endHours":9.126660398002636,"planetary_lord":"Moon"},{"name":"Hora 4","start":"09:08","end":"10:08","startHours":9.126660398002636,"endHours":10.126660398002636,"planetary_lord":"Mercury"},{"name":"Hora 5","start":"10:08","end":"11:08","startHours":10.126660398002636,"endHours":11.126660398002636,"planetary_lord":"Venus"},{"name":"Hora 6","start":"11:08","end":"12:08","startHours":11.126660398002636,"endHours":12.126660398002636,"planetary_lord":"Sun"},{"name":"Hora 7","start":"12:08","end":"13:08","startHours":12.126660398002636,"endHours":13.126660398002636,"planetary_lord":"Mars"},{"name":"Hora 8","start":"13:08","end":"14:08","startHours":13.126660398002636,"endHours":14.126660398002636,"planetary_lord":"Jupiter"},{"name":"Hora 9","start":"14:08","end":"15:08","startHours":14.126660398002636,"endHours":15.126660398002636,"planetary_lord":"Saturn"},{"name":"Hora 10","start":"15:08","end":"16:08","startHours":15.126660398002636,"endHours":16.126660398002635,"planetary_lord":"Moon"},{"name":"Hora 11","start":"16:08","end":"17:08","startHours":16.126660398002635,"endHours":17.126660398002635,"planetary_lord":"Mercury"},{"name":"Hora 12","start":"17:08","end":"18:08","startHours":17.126660398002635,"endHours":18.126660398002635,"planetary_lord":"Venus"},{"name":"Hora 13","start":"18:08","end":"19:08","startHours":18.126660398002635,"endHours":19.126660398002635,"planetary_lord":"Sun"},{"name":"Hora 14","start":"19:08","end":"20:08","startHours":19.126660398002635,"endHours":20.126660398002635,"planetary_lord":"Mars"},{"name":"Hora 15","start":"20:08","end":"21:08","startHours":20.126660398002635,"endHours":21.126660398002635,"planetary_lord":"Jupiter"},{"name":"Hora 16","start":"21:08","end":"22:08","startHours":21.126660398002635,"endHours":22.126660398002635,"planetary_lord":"Saturn"},{"name":"Hora 17","start":"22:08","end":"23:08","startHours":22.126660398002635,"endHours":23.126660398002635,"planetary_lord":"Moon"},{"name":"Hora 18","start":"23:08","end":"00:08","startHours":23.126660398002635,"endHours":24.126660398002635,"planetary_lord":"Mercury"},{"name":"Hora 19","start":"00:08","end":"01:08","startHours":24.126660398002635,"endHours":25.126660398002635,"planetary_lord":"Venus"},{"name":"Hora 20","start":"01:08","end":"02:08","startHours":25.126660398002635,"endHours":26.126660398002635,"planetary_lord":"Sun"},{"name":"Hora 21","start":"02:08","end":"03:08","startHours":26.126660398002635,"endHours":27.126660398002635,"planetary_lord":"Mars"},{"name":"Hora 22","start":"03:08","end":"04:08","startHours":27.126660398002635,"endHours":28.126660398002635,"planetary_lord":"Jupiter"},{"name":"Hora 23","start":"04:08","end":"05:08","startHours":28.126660398002635,"endHours":29.126660398002635,"planetary_lord":"Saturn"},{"name":"Hora 24","start":"05:08","end":"06:08","startHours":29.126660398002635,"endHours":30.126660398002635,"planetary_lord":"Moon"}],"taraBala":{"favorable_nakshatras":["Bharaṇī","Kṛttikā","Rohiṇī","Mṛgaśirā","Ārdrā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Citrā","Svātī","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj"],"unfavorable_nakshatras":["Aśvinī","Punarvasu","Puṣya","Aśleṣā","Maghā","Viśākhā","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Meṣa","Mithuna","Kanyā","Tulā","Makara","Kumbha"],"unfavorable_rashis":["Vṛṣabha","Karka","Siṃha","Vṛścika","Dhanu","Mīna"]},"dishaShool":"South (Dakṣiṇa)","chandraVasa":"East","rahuVasa":"North-West","anandadiYoga":{"name":"Mṛtyu","quality":"Inauspicious"},"drikRitu":"Varṣā (Monsoon)","vedicRitu":"Varṣā (Monsoon)","drikAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":2.355069820580337,"eotMinutes":6.239563755367786,"ayanamsa":23.5975}},"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 Kṛṣṇa Pakṣa","solar_month":"Kanyā (Puraṭṭāsi)","ritu":"Śarad (Autumn)","display_summary":"Āśvina Kṛṣṇa Caturthī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"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},{"id":"sankashti-chaturthi","name":"Saṅkaṣṭī Caturthī","name_sanskrit":"सङ्कष्टी चतुर्थी","tradition":"Pan-Hindu","associated_deity":"Gaṇeśa","significance":"Monthly Gaṇeśa vrata.","vrata":true,"detection":{"tithi_number":19,"tithi_paksha":"Kṛṣṇa"},"precedence":6}],"todays_walk":{"walk":{"id":"guru-walk","name":"Bṛhaspati Walk","name_sanskrit":"गुरु यात्रा","type":"graha","description":"Wisdom transmission + BG 4.34.","step_count":8,"url":"/walk/guru-walk"},"reason":"Guruvāra (Thursday) — its presiding graha's walk."},"cosmic_resonances":[{"historical_date":"-3101-02-18","event":"Kali Yuga Epoch","chart_id":"kali-yuga-epoch","shared_marker":"same Aśvinī","url":"/day/-3101-02-18","relevance":0.5}]},"validity":{"eternal":false,"location_specific":"erode"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga September 17, 1981 CE · Erode, Tamil Nadu · Vidhyamitra","description":"September 17, 1981 CE for Erode, Tamil Nadu: Kṛṣṇa Caturthī, sūryodaya 06:08, sūryāsta 18:18.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/erode/1981-09-17","hreflang_alternates":{"en":"https://vidhyamitra.com/city/erode/1981-09-17","sa":"https://sa.vidhyamitra.com/city/erode/1981-09-17","hi":"https://hi.vidhyamitra.com/city/erode/1981-09-17","x-default":"https://vidhyamitra.com/city/erode/1981-09-17"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-18T18:47:50.141Z","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":"2026-05-18T18:47:50.141Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-18T18:47:50.141Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}