{"id":"vidhyamitra:city-day:rishikesh:1980-09-11:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/rishikesh/1980-09-11","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1980-09-11","date_display":"September 11, 1980 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":1980,"month":9,"day":11,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444493.770833,"kali_year":5082,"ahargana":1856028.2708,"sun":{"sidereal_longitude":144.2058,"rashi":5,"rashi_name":"Siṃha"},"moon":{"sidereal_longitude":164.6935,"rashi":6,"rashi_name":"Kanyā"},"tithi":{"number":2,"name":"Dvitīyā","paksha":"Śukla","full_name":"Śukla Dvitīyā","elongation_degrees":20.4876,"elapsed_within_tithi_degrees":8.4876},"nakshatra":{"number":13,"name":"Hasta","pada":2,"moon_longitude":164.6935,"elapsed_within_degrees":4.6935},"yoga":{"number":24,"name":"Śukla","sum_longitude":308.8993},"karana":{"half_tithi_index":3,"name":"Kaulava"},"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":1980,"month":9,"day":11,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444493.770833,"ahargana":1856028.2708,"kali_year":5082,"ayanamsa_lahiri":23.5833,"grahas":{"sun":{"sidereal_longitude":144.877519,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":4},"retrograde":false},"moon":{"sidereal_longitude":162.61951899999997,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":1},"retrograde":false,"latitude":3.2356},"mars":{"sidereal_longitude":195.161519,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":158.214919,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":146.638619,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":4},"retrograde":false},"venus":{"sidereal_longitude":100.12131899999997,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":154.863919,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":3},"retrograde":false},"rahu":{"sidereal_longitude":118.6904,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":298.6904,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":2},"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":1980,"month":9,"day":11,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444493.770833,"kali_year":5082,"ahargana":1856028.2708,"sun":{"sidereal_longitude":144.2058,"rashi":5,"rashi_name":"Siṃha"},"moon":{"sidereal_longitude":164.6935,"rashi":6,"rashi_name":"Kanyā"},"tithi":{"number":2,"name":"Dvitīyā","paksha":"Śukla","full_name":"Śukla Dvitīyā","elongation_degrees":20.4876,"elapsed_within_tithi_degrees":8.4876},"nakshatra":{"number":13,"name":"Hasta","pada":2,"moon_longitude":164.6935,"elapsed_within_degrees":4.6935},"yoga":{"number":24,"name":"Śukla","sum_longitude":308.8993},"karana":{"half_tithi_index":3,"name":"Kaulava"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":3.236,"elongation":20.488},"lunar":{"type":"lunar","occurs":false,"moon_latitude":3.236,"opposition_distance":159.512}},"eclipse_window_40days":[{"offset_days":-16,"type":"lunar","occurs":true,"moon_latitude":-0.515,"opposition_distance":2.645}]},"city":{"slug":"rishikesh","name":"Ṛṣikeśa","lat":30.0869,"lon":78.2676,"tz_offset_hours":5.5,"state":"Uttarakhand","country":"IN","tier":"tirtha"},"tier2":{"city":{"slug":"rishikesh","name":"Ṛṣikeśa","lat":30.0869,"lon":78.2676,"tz_offset_hours":5.5,"state":"Uttarakhand","country":"IN","tier":"tirtha"},"sunriseLocal":"05:58","sunsetLocal":"18:27","solarNoonLocal":"12:13","dayLengthHours":12.482352371538084,"dayLengthDisplay":"12 Hours 28 Mins 56 Secs","nightLengthDisplay":"11 Hours 31 Mins 04 Secs","moonriseLocal":"07:27","moonsetLocal":"19:21","rahuKala":{"name":"Rāhu Kāla","start":"13:47","end":"15:20","startHours":13.775547510536214,"endHours":15.335841556978476,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"05:58","end":"07:32","startHours":5.974077278324912,"endHours":7.534371324767172,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"09:06","end":"10:39","startHours":9.094665371209434,"endHours":10.654959417651693,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:53","end":"09:18","startHours":8.886626165017132,"endHours":9.302704577401734,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:30","end":"06:50","startHours":6.494175293805665,"endHours":6.827038023713348,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:48","end":"12:38","startHours":11.799175051709351,"endHours":12.631331876478558,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:19","end":"05:09","startHours":4.3097636287865,"endHours":5.141920453555707,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:56","end":"05:58","startHours":4.933881247363405,"endHours":5.974077278324912,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:18","end":"15:08","startHours":14.295645526016969,"endHours":15.127802350786174,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:15","end":"18:39","startHours":18.256429649862998,"endHours":18.656429649862996,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:27","end":"18:59","startHours":18.456429649862997,"endHours":18.976527665343752,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:12","end":"19:57","startHours":18.206429649862997,"endHours":19.956429649862997,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:48","end":"00:38","startHours":23.79917505170935,"endHours":24.63133187647856,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Śubha","start":"05:58","end":"07:32","startHours":5.974077278324912,"endHours":7.534371324767172,"quality":"auspicious"},{"name":"Roga","start":"07:32","end":"09:06","startHours":7.534371324767172,"endHours":9.094665371209434,"quality":"inauspicious"},{"name":"Udveg","start":"09:06","end":"10:39","startHours":9.094665371209434,"endHours":10.654959417651693,"quality":"inauspicious"},{"name":"Chala","start":"10:39","end":"12:13","startHours":10.654959417651693,"endHours":12.215253464093955,"quality":"neutral"},{"name":"Labha","start":"12:13","end":"13:47","startHours":12.215253464093955,"endHours":13.775547510536214,"quality":"auspicious"},{"name":"Amṛta","start":"13:47","end":"15:20","startHours":13.775547510536214,"endHours":15.335841556978476,"quality":"auspicious"},{"name":"Kāla","start":"15:20","end":"16:54","startHours":15.335841556978476,"endHours":16.896135603420735,"quality":"inauspicious"},{"name":"Śubha","start":"16:54","end":"18:27","startHours":16.896135603420735,"endHours":18.456429649862997,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Amṛta","start":"18:27","end":"19:54","startHours":18.456429649862997,"endHours":19.89613560342074,"quality":"auspicious"},{"name":"Kāla","start":"19:54","end":"21:20","startHours":19.89613560342074,"endHours":21.335841556978476,"quality":"inauspicious"},{"name":"Śubha","start":"21:20","end":"22:47","startHours":21.335841556978476,"endHours":22.775547510536214,"quality":"auspicious"},{"name":"Roga","start":"22:47","end":"00:13","startHours":22.775547510536214,"endHours":24.215253464093955,"quality":"inauspicious"},{"name":"Udveg","start":"00:13","end":"01:39","startHours":24.215253464093955,"endHours":25.654959417651696,"quality":"inauspicious"},{"name":"Chala","start":"01:39","end":"03:06","startHours":25.654959417651696,"endHours":27.094665371209434,"quality":"neutral"},{"name":"Labha","start":"03:06","end":"04:32","startHours":27.094665371209434,"endHours":28.53437132476717,"quality":"auspicious"},{"name":"Amṛta","start":"04:32","end":"05:58","startHours":28.53437132476717,"endHours":29.974077278324913,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"05:58","end":"06:58","startHours":5.974077278324912,"endHours":6.974077278324912,"planetary_lord":"Jupiter"},{"name":"Hora 2","start":"06:58","end":"07:58","startHours":6.974077278324912,"endHours":7.974077278324912,"planetary_lord":"Saturn"},{"name":"Hora 3","start":"07:58","end":"08:58","startHours":7.974077278324912,"endHours":8.974077278324913,"planetary_lord":"Moon"},{"name":"Hora 4","start":"08:58","end":"09:58","startHours":8.974077278324913,"endHours":9.974077278324913,"planetary_lord":"Mercury"},{"name":"Hora 5","start":"09:58","end":"10:58","startHours":9.974077278324913,"endHours":10.974077278324913,"planetary_lord":"Venus"},{"name":"Hora 6","start":"10:58","end":"11:58","startHours":10.974077278324913,"endHours":11.974077278324913,"planetary_lord":"Sun"},{"name":"Hora 7","start":"11:58","end":"12:58","startHours":11.974077278324913,"endHours":12.974077278324913,"planetary_lord":"Mars"},{"name":"Hora 8","start":"12:58","end":"13:58","startHours":12.974077278324913,"endHours":13.974077278324913,"planetary_lord":"Jupiter"},{"name":"Hora 9","start":"13:58","end":"14:58","startHours":13.974077278324913,"endHours":14.974077278324913,"planetary_lord":"Saturn"},{"name":"Hora 10","start":"14:58","end":"15:58","startHours":14.974077278324913,"endHours":15.974077278324913,"planetary_lord":"Moon"},{"name":"Hora 11","start":"15:58","end":"16:58","startHours":15.974077278324913,"endHours":16.974077278324913,"planetary_lord":"Mercury"},{"name":"Hora 12","start":"16:58","end":"17:58","startHours":16.974077278324913,"endHours":17.974077278324913,"planetary_lord":"Venus"},{"name":"Hora 13","start":"17:58","end":"18:58","startHours":17.974077278324913,"endHours":18.974077278324913,"planetary_lord":"Sun"},{"name":"Hora 14","start":"18:58","end":"19:58","startHours":18.974077278324913,"endHours":19.974077278324913,"planetary_lord":"Mars"},{"name":"Hora 15","start":"19:58","end":"20:58","startHours":19.974077278324913,"endHours":20.974077278324913,"planetary_lord":"Jupiter"},{"name":"Hora 16","start":"20:58","end":"21:58","startHours":20.974077278324913,"endHours":21.974077278324913,"planetary_lord":"Saturn"},{"name":"Hora 17","start":"21:58","end":"22:58","startHours":21.974077278324913,"endHours":22.974077278324913,"planetary_lord":"Moon"},{"name":"Hora 18","start":"22:58","end":"23:58","startHours":22.974077278324913,"endHours":23.974077278324913,"planetary_lord":"Mercury"},{"name":"Hora 19","start":"23:58","end":"00:58","startHours":23.974077278324913,"endHours":24.974077278324913,"planetary_lord":"Venus"},{"name":"Hora 20","start":"00:58","end":"01:58","startHours":24.974077278324913,"endHours":25.974077278324913,"planetary_lord":"Sun"},{"name":"Hora 21","start":"01:58","end":"02:58","startHours":25.974077278324913,"endHours":26.974077278324913,"planetary_lord":"Mars"},{"name":"Hora 22","start":"02:58","end":"03:58","startHours":26.974077278324913,"endHours":27.974077278324913,"planetary_lord":"Jupiter"},{"name":"Hora 23","start":"03:58","end":"04:58","startHours":27.974077278324913,"endHours":28.974077278324913,"planetary_lord":"Saturn"},{"name":"Hora 24","start":"04:58","end":"05:58","startHours":28.974077278324913,"endHours":29.974077278324913,"planetary_lord":"Moon"}],"taraBala":{"favorable_nakshatras":["Mṛgaśirā","Ārdrā","Punarvasu","Puṣya","Aśleṣā","Citrā","Svātī","Viśākhā","Anurādhā","Jyeṣṭhā","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Rohiṇī","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Mithuna","Karka","Kanyā","Vṛścika","Kumbha","Mīna"],"unfavorable_rashis":["Meṣa","Vṛṣabha","Siṃha","Tulā","Dhanu","Makara"]},"dishaShool":"South (Dakṣiṇa)","chandraVasa":"North-West","rahuVasa":"North-West","anandadiYoga":{"name":"Ānanda","quality":"Auspicious"},"tropicalRitu":"Varṣā (Monsoon) (tropical)","vedicRitu":"Varṣā (Monsoon)","tropicalAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":4.563367222288416,"eotMinutes":4.014392154362758,"ayanamsa":23.5833}},"calendars":{"vikram_samvat":2037,"vikram_samvatsara":"Śrīmukha","saka_samvat":1902,"saka_samvatsara":"Raudra","bengali_samvat":1387,"malayalam_era":1156,"nanakshahi_year":511,"lunar_month":"Bhādrapada","lunar_month_paksha_full":"Bhādrapada Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Bhādrapada","lunar_month_amanta":"Bhādrapada","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Siṃha (Āvaṇi)","ritu":"Varṣā (Monsoon)","display_summary":"Bhādrapada Śukla Dvitīyā · Vikram 2037 Śrīmukha · Śaka 1902 Raudra"},"festivals":[],"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":[]},"validity":{"eternal":false,"location_specific":"rishikesh"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga September 11, 1980 CE · Ṛṣikeśa · Vidhyamitra","description":"September 11, 1980 CE for Ṛṣikeśa: Śukla Dvitīyā, sūryodaya 05:58, sūryāsta 18:27.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/rishikesh/1980-09-11","hreflang_alternates":{"en":"https://vidhyamitra.com/city/rishikesh/1980-09-11","sa":"https://sa.vidhyamitra.com/city/rishikesh/1980-09-11","hi":"https://hi.vidhyamitra.com/city/rishikesh/1980-09-11","x-default":"https://vidhyamitra.com/city/rishikesh/1980-09-11"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-02T07:59:18.705Z","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":"2026-06-02T07:59:18.705Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-02T07:59:18.705Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}