{"id":"vidhyamitra:city-day:rishikesh:1981-09-10:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/rishikesh/1981-09-10","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-09-10","date_display":"September 10, 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":10,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444857.770833,"kali_year":5083,"ahargana":1856392.2708,"sun":{"sidereal_longitude":142.9852,"rashi":5,"rashi_name":"Siṃha"},"moon":{"sidereal_longitude":272.6183,"rashi":10,"rashi_name":"Makara"},"tithi":{"number":11,"name":"Ekādaśī","paksha":"Śukla","full_name":"Śukla Ekādaśī","elongation_degrees":129.633,"elapsed_within_tithi_degrees":9.633},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":2,"moon_longitude":272.6183,"elapsed_within_degrees":5.9516},"yoga":{"number":5,"name":"Śobhana","sum_longitude":55.6035},"karana":{"half_tithi_index":21,"name":"Viṣṭi"},"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":10,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444857.770833,"ahargana":1856392.2708,"kali_year":5083,"ayanamsa_lahiri":23.5972,"grahas":{"sun":{"sidereal_longitude":143.65651200000002,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":4},"retrograde":false},"moon":{"sidereal_longitude":272.67621199999996,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":2},"retrograde":false,"latitude":0.5312},"mars":{"sidereal_longitude":101.694212,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":166.967712,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":3},"retrograde":false},"jupiter":{"sidereal_longitude":170.21431200000006,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":4},"retrograde":false},"venus":{"sidereal_longitude":183.25561199999993,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":14,"name":"Citrā","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":165.776212,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":false},"rahu":{"sidereal_longitude":99.4039,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":279.4039,"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":10,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444857.770833,"kali_year":5083,"ahargana":1856392.2708,"sun":{"sidereal_longitude":142.9852,"rashi":5,"rashi_name":"Siṃha"},"moon":{"sidereal_longitude":272.6183,"rashi":10,"rashi_name":"Makara"},"tithi":{"number":11,"name":"Ekādaśī","paksha":"Śukla","full_name":"Śukla Ekādaśī","elongation_degrees":129.633,"elapsed_within_tithi_degrees":9.633},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":2,"moon_longitude":272.6183,"elapsed_within_degrees":5.9516},"yoga":{"number":5,"name":"Śobhana","sum_longitude":55.6035},"karana":{"half_tithi_index":21,"name":"Viṣṭi"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":0.531,"elongation":129.633},"lunar":{"type":"lunar","occurs":false,"moon_latitude":0.531,"opposition_distance":50.367}},"eclipse_window_40days":[]},"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":"18:29","solarNoonLocal":"12:13","dayLengthHours":12.519162320487078,"dayLengthDisplay":"12 Hours 31 Mins 09 Secs","nightLengthDisplay":"11 Hours 28 Mins 51 Secs","moonriseLocal":"15:38","moonsetLocal":"02:01","rahuKala":{"name":"Rāhu Kāla","start":"13:47","end":"15:21","startHours":13.78627366043345,"endHours":15.351168950494335,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"05:58","end":"07:32","startHours":5.961797210129026,"endHours":7.5266925001899105,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"09:05","end":"10:39","startHours":9.091587790250795,"endHours":10.65648308031168,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:53","end":"09:18","startHours":8.882935084909345,"endHours":9.300240495592247,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:29","end":"06:49","startHours":6.4834289734826545,"endHours":6.817273302028976,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:48","end":"12:38","startHours":11.804072959689663,"endHours":12.638683781055466,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:18","end":"05:08","startHours":4.2925755673974155,"endHours":5.127186388763221,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:55","end":"05:58","startHours":4.918533683421769,"endHours":5.961797210129026,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:18","end":"15:09","startHours":14.307905423787078,"endHours":15.142516245152883,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:17","end":"18:41","startHours":18.280959530616105,"endHours":18.680959530616104,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:29","end":"19:00","startHours":18.480959530616104,"endHours":19.002591293969733,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:14","end":"19:59","startHours":18.230959530616104,"endHours":19.980959530616104,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:48","end":"00:38","startHours":23.80407295968966,"endHours":24.638683781055466,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Śubha","start":"05:58","end":"07:32","startHours":5.961797210129026,"endHours":7.5266925001899105,"quality":"auspicious"},{"name":"Roga","start":"07:32","end":"09:05","startHours":7.5266925001899105,"endHours":9.091587790250795,"quality":"inauspicious"},{"name":"Udveg","start":"09:05","end":"10:39","startHours":9.091587790250795,"endHours":10.65648308031168,"quality":"inauspicious"},{"name":"Chala","start":"10:39","end":"12:13","startHours":10.65648308031168,"endHours":12.221378370372566,"quality":"neutral"},{"name":"Labha","start":"12:13","end":"13:47","startHours":12.221378370372566,"endHours":13.78627366043345,"quality":"auspicious"},{"name":"Amṛta","start":"13:47","end":"15:21","startHours":13.78627366043345,"endHours":15.351168950494335,"quality":"auspicious"},{"name":"Kāla","start":"15:21","end":"16:55","startHours":15.351168950494335,"endHours":16.91606424055522,"quality":"inauspicious"},{"name":"Śubha","start":"16:55","end":"18:29","startHours":16.91606424055522,"endHours":18.480959530616104,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Amṛta","start":"18:29","end":"19:55","startHours":18.480959530616104,"endHours":19.91606424055522,"quality":"auspicious"},{"name":"Kāla","start":"19:55","end":"21:21","startHours":19.91606424055522,"endHours":21.351168950494333,"quality":"inauspicious"},{"name":"Śubha","start":"21:21","end":"22:47","startHours":21.351168950494333,"endHours":22.78627366043345,"quality":"auspicious"},{"name":"Roga","start":"22:47","end":"00:13","startHours":22.78627366043345,"endHours":24.221378370372566,"quality":"inauspicious"},{"name":"Udveg","start":"00:13","end":"01:39","startHours":24.221378370372566,"endHours":25.65648308031168,"quality":"inauspicious"},{"name":"Chala","start":"01:39","end":"03:05","startHours":25.65648308031168,"endHours":27.091587790250795,"quality":"neutral"},{"name":"Labha","start":"03:05","end":"04:32","startHours":27.091587790250795,"endHours":28.52669250018991,"quality":"auspicious"},{"name":"Amṛta","start":"04:32","end":"05:58","startHours":28.52669250018991,"endHours":29.961797210129028,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"05:58","end":"06:58","startHours":5.961797210129026,"endHours":6.961797210129026,"planetary_lord":"Jupiter"},{"name":"Hora 2","start":"06:58","end":"07:58","startHours":6.961797210129026,"endHours":7.961797210129026,"planetary_lord":"Saturn"},{"name":"Hora 3","start":"07:58","end":"08:58","startHours":7.961797210129026,"endHours":8.961797210129026,"planetary_lord":"Moon"},{"name":"Hora 4","start":"08:58","end":"09:58","startHours":8.961797210129026,"endHours":9.961797210129026,"planetary_lord":"Mercury"},{"name":"Hora 5","start":"09:58","end":"10:58","startHours":9.961797210129026,"endHours":10.961797210129026,"planetary_lord":"Venus"},{"name":"Hora 6","start":"10:58","end":"11:58","startHours":10.961797210129026,"endHours":11.961797210129026,"planetary_lord":"Sun"},{"name":"Hora 7","start":"11:58","end":"12:58","startHours":11.961797210129026,"endHours":12.961797210129026,"planetary_lord":"Mars"},{"name":"Hora 8","start":"12:58","end":"13:58","startHours":12.961797210129026,"endHours":13.961797210129026,"planetary_lord":"Jupiter"},{"name":"Hora 9","start":"13:58","end":"14:58","startHours":13.961797210129026,"endHours":14.961797210129026,"planetary_lord":"Saturn"},{"name":"Hora 10","start":"14:58","end":"15:58","startHours":14.961797210129026,"endHours":15.961797210129026,"planetary_lord":"Moon"},{"name":"Hora 11","start":"15:58","end":"16:58","startHours":15.961797210129026,"endHours":16.961797210129028,"planetary_lord":"Mercury"},{"name":"Hora 12","start":"16:58","end":"17:58","startHours":16.961797210129028,"endHours":17.961797210129028,"planetary_lord":"Venus"},{"name":"Hora 13","start":"17:58","end":"18:58","startHours":17.961797210129028,"endHours":18.961797210129028,"planetary_lord":"Sun"},{"name":"Hora 14","start":"18:58","end":"19:58","startHours":18.961797210129028,"endHours":19.961797210129028,"planetary_lord":"Mars"},{"name":"Hora 15","start":"19:58","end":"20:58","startHours":19.961797210129028,"endHours":20.961797210129028,"planetary_lord":"Jupiter"},{"name":"Hora 16","start":"20:58","end":"21:58","startHours":20.961797210129028,"endHours":21.961797210129028,"planetary_lord":"Saturn"},{"name":"Hora 17","start":"21:58","end":"22:58","startHours":21.961797210129028,"endHours":22.961797210129028,"planetary_lord":"Moon"},{"name":"Hora 18","start":"22:58","end":"23:58","startHours":22.961797210129028,"endHours":23.961797210129028,"planetary_lord":"Mercury"},{"name":"Hora 19","start":"23:58","end":"00:58","startHours":23.961797210129028,"endHours":24.961797210129028,"planetary_lord":"Venus"},{"name":"Hora 20","start":"00:58","end":"01:58","startHours":24.961797210129028,"endHours":25.961797210129028,"planetary_lord":"Sun"},{"name":"Hora 21","start":"01:58","end":"02:58","startHours":25.961797210129028,"endHours":26.961797210129028,"planetary_lord":"Mars"},{"name":"Hora 22","start":"02:58","end":"03:58","startHours":26.961797210129028,"endHours":27.961797210129028,"planetary_lord":"Jupiter"},{"name":"Hora 23","start":"03:58","end":"04:58","startHours":27.961797210129028,"endHours":28.961797210129028,"planetary_lord":"Saturn"},{"name":"Hora 24","start":"04:58","end":"05:58","startHours":28.961797210129028,"endHours":29.961797210129028,"planetary_lord":"Moon"}],"taraBala":{"favorable_nakshatras":["Rohiṇī","Mṛgaśirā","Ārdrā","Punarvasu","Puṣya","Hasta","Citrā","Svātī","Viśākhā","Anurādhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā"],"unfavorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Aśleṣā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Revatī"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Mithuna","Karka","Tulā","Vṛścika","Makara","Mīna"],"unfavorable_rashis":["Meṣa","Vṛṣabha","Siṃha","Kanyā","Dhanu","Kumbha"]},"dishaShool":"South (Dakṣiṇa)","chandraVasa":"South-East","rahuVasa":"North-West","anandadiYoga":{"name":"Vajra","quality":"Inauspicious"},"drikRitu":"Varṣā (Monsoon) (Drik)","vedicRitu":"Varṣā (Monsoon)","drikAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":5.034375029397262,"eotMinutes":3.6468977776461458,"ayanamsa":23.5972}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Bhādrapada","lunar_month_paksha_full":"Bhādrapada Śukla Pakṣa","solar_month":"Siṃha (Āvaṇi)","ritu":"Varṣā (Monsoon)","display_summary":"Bhādrapada Śukla Ekādaśī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"parsva-ekadashi","name":"Pārśva (Parivartinī) Ekādaśī","name_sanskrit":"पार्श्व एकादशी","tradition":"Vaishnava","associated_deity":"Bhagavān Viṣṇu (turning side in yoga-nidrā)","significance":"Viṣṇu turns from one side to another in yoga-nidrā (mid-Cāturmāsya).","vrata":true,"detection":{"tithi_number":11,"tithi_paksha":"Śukla","lunar_month":"Bhādrapada"},"precedence":3},{"id":"ekadashi","name":"Ekādaśī","name_sanskrit":"एकादशी","tradition":"Vaishnava","associated_deity":"Bhagavān Viṣṇu","significance":"Sacred to Bhagavān Viṣṇu; vrata for purification.","vrata":true,"detection":{"any_of":[{"tithi_number":11},{"tithi_number":26}]},"precedence":5},{"id":"simha-sankranti","name":"Siṁha Saṅkrānti","name_sanskrit":"सिंह सङ्क्रान्ति","tradition":"Pan-Hindu","significance":"Sun enters Leo.","vrata":false,"detection":{"sun_rashi":"Siṃha"},"precedence":5}],"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 10, 1981 CE · Ṛṣikeśa · Vidhyamitra","description":"September 10, 1981 CE for Ṛṣikeśa: Śukla Ekādaśī, sūryodaya 05:58, sūryāsta 18:29.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/rishikesh/1981-09-10","hreflang_alternates":{"en":"https://vidhyamitra.com/city/rishikesh/1981-09-10","sa":"https://sa.vidhyamitra.com/city/rishikesh/1981-09-10","hi":"https://hi.vidhyamitra.com/city/rishikesh/1981-09-10","x-default":"https://vidhyamitra.com/city/rishikesh/1981-09-10"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-18T13:07:20.032Z","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":"2026-05-18T13:07:20.032Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-18T13:07:20.032Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}