{"id":"vidhyamitra:city-day:rishikesh:1981-01-17:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/rishikesh/1981-01-17","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-01-17","date_display":"January 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":1,"day":17,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444621.770833,"kali_year":5082,"ahargana":1856156.2708,"sun":{"sidereal_longitude":273.2094,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":52.3494,"rashi":2,"rashi_name":"Vṛṣabha"},"tithi":{"number":12,"name":"Dvādaśī","paksha":"Śukla","full_name":"Śukla Dvādaśī","elongation_degrees":139.14,"elapsed_within_tithi_degrees":7.14},"nakshatra":{"number":4,"name":"Rohiṇī","pada":4,"moon_longitude":52.3494,"elapsed_within_degrees":12.3494},"yoga":{"number":25,"name":"Brahma","sum_longitude":325.5589},"karana":{"half_tithi_index":23,"name":"Bālava"},"vara":{"number":1,"name":"Śanivāra (Saturday)"}},"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":1,"day":17,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444621.770833,"ahargana":1856156.2708,"kali_year":5082,"ayanamsa_lahiri":23.5882,"grahas":{"sun":{"sidereal_longitude":273.258329,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":2},"retrograde":false},"moon":{"sidereal_longitude":51.035729,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":4},"retrograde":false,"latitude":-3.8787},"mars":{"sidereal_longitude":290.19072900000003,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":284.105229,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":2},"retrograde":false},"jupiter":{"sidereal_longitude":166.75362900000005,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":3},"retrograde":false},"venus":{"sidereal_longitude":253.88862900000004,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":1},"retrograde":false},"saturn":{"sidereal_longitude":165.959929,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":true},"rahu":{"sidereal_longitude":111.9083,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":291.9083,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","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":1,"day":17,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444621.770833,"kali_year":5082,"ahargana":1856156.2708,"sun":{"sidereal_longitude":273.2094,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":52.3494,"rashi":2,"rashi_name":"Vṛṣabha"},"tithi":{"number":12,"name":"Dvādaśī","paksha":"Śukla","full_name":"Śukla Dvādaśī","elongation_degrees":139.14,"elapsed_within_tithi_degrees":7.14},"nakshatra":{"number":4,"name":"Rohiṇī","pada":4,"moon_longitude":52.3494,"elapsed_within_degrees":12.3494},"yoga":{"number":25,"name":"Brahma","sum_longitude":325.5589},"karana":{"half_tithi_index":23,"name":"Bālava"},"vara":{"number":1,"name":"Śanivāra (Saturday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-3.879,"elongation":139.14},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-3.879,"opposition_distance":40.86}},"eclipse_window_40days":[{"offset_days":3,"type":"lunar","occurs":true,"moon_latitude":-1.332,"opposition_distance":1.776},{"offset_days":19,"type":"solar","occurs":true,"moon_latitude":-0.15,"elongation":0.162}]},"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":"07:14","sunsetLocal":"17:40","solarNoonLocal":"12:27","dayLengthHours":10.446607186463275,"dayLengthDisplay":"10 Hours 26 Mins 48 Secs","nightLengthDisplay":"13 Hours 33 Mins 12 Secs","moonriseLocal":"14:39","moonsetLocal":"04:37","rahuKala":{"name":"Rāhu Kāla","start":"09:50","end":"11:09","startHours":9.837609682485992,"endHours":11.143435580793902,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"13:45","end":"15:04","startHours":13.755087377409719,"endHours":15.06091327571763,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"07:14","end":"08:32","startHours":7.225957885870173,"endHours":8.531783784178081,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:40","end":"10:01","startHours":9.663499562711603,"endHours":10.01171980226038,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:40","end":"07:56","startHours":7.661233185306143,"endHours":7.939809376945163,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:06","end":"12:48","startHours":12.101041239553036,"endHours":12.797481718650586,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:50","end":"06:32","startHours":5.833076927675069,"endHours":6.529517406772621,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"06:21","end":"07:14","startHours":6.355407286998234,"endHours":7.225957885870173,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:11","end":"14:53","startHours":14.190362676845691,"endHours":14.886803155943243,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:28","end":"17:52","startHours":17.47256507233345,"endHours":17.872565072333447,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:40","end":"18:06","startHours":17.672565072333448,"endHours":18.107840371769417,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:25","end":"19:10","startHours":17.422565072333448,"endHours":19.172565072333448,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:06","end":"00:48","startHours":24.101041239553034,"endHours":24.797481718650587,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Kāla","start":"07:14","end":"08:32","startHours":7.225957885870173,"endHours":8.531783784178081,"quality":"inauspicious"},{"name":"Śubha","start":"08:32","end":"09:50","startHours":8.531783784178081,"endHours":9.837609682485992,"quality":"auspicious"},{"name":"Roga","start":"09:50","end":"11:09","startHours":9.837609682485992,"endHours":11.143435580793902,"quality":"inauspicious"},{"name":"Udveg","start":"11:09","end":"12:27","startHours":11.143435580793902,"endHours":12.44926147910181,"quality":"inauspicious"},{"name":"Chala","start":"12:27","end":"13:45","startHours":12.44926147910181,"endHours":13.755087377409719,"quality":"neutral"},{"name":"Labha","start":"13:45","end":"15:04","startHours":13.755087377409719,"endHours":15.06091327571763,"quality":"auspicious"},{"name":"Amṛta","start":"15:04","end":"16:22","startHours":15.06091327571763,"endHours":16.36673917402554,"quality":"auspicious"},{"name":"Kāla","start":"16:22","end":"17:40","startHours":16.36673917402554,"endHours":17.672565072333448,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Labha","start":"17:40","end":"19:22","startHours":17.672565072333448,"endHours":19.36673917402554,"quality":"auspicious"},{"name":"Amṛta","start":"19:22","end":"21:04","startHours":19.36673917402554,"endHours":21.06091327571763,"quality":"auspicious"},{"name":"Kāla","start":"21:04","end":"22:45","startHours":21.06091327571763,"endHours":22.75508737740972,"quality":"inauspicious"},{"name":"Śubha","start":"22:45","end":"00:27","startHours":22.75508737740972,"endHours":24.44926147910181,"quality":"auspicious"},{"name":"Roga","start":"00:27","end":"02:09","startHours":24.44926147910181,"endHours":26.143435580793902,"quality":"inauspicious"},{"name":"Udveg","start":"02:09","end":"03:50","startHours":26.143435580793902,"endHours":27.83760968248599,"quality":"inauspicious"},{"name":"Chala","start":"03:50","end":"05:32","startHours":27.83760968248599,"endHours":29.53178378417808,"quality":"neutral"},{"name":"Labha","start":"05:32","end":"07:14","startHours":29.53178378417808,"endHours":31.225957885870173,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"07:14","end":"08:14","startHours":7.225957885870173,"endHours":8.225957885870173,"planetary_lord":"Saturn"},{"name":"Hora 2","start":"08:14","end":"09:14","startHours":8.225957885870173,"endHours":9.225957885870173,"planetary_lord":"Moon"},{"name":"Hora 3","start":"09:14","end":"10:14","startHours":9.225957885870173,"endHours":10.225957885870173,"planetary_lord":"Mercury"},{"name":"Hora 4","start":"10:14","end":"11:14","startHours":10.225957885870173,"endHours":11.225957885870173,"planetary_lord":"Venus"},{"name":"Hora 5","start":"11:14","end":"12:14","startHours":11.225957885870173,"endHours":12.225957885870173,"planetary_lord":"Sun"},{"name":"Hora 6","start":"12:14","end":"13:14","startHours":12.225957885870173,"endHours":13.225957885870173,"planetary_lord":"Mars"},{"name":"Hora 7","start":"13:14","end":"14:14","startHours":13.225957885870173,"endHours":14.225957885870173,"planetary_lord":"Jupiter"},{"name":"Hora 8","start":"14:14","end":"15:14","startHours":14.225957885870173,"endHours":15.225957885870173,"planetary_lord":"Saturn"},{"name":"Hora 9","start":"15:14","end":"16:14","startHours":15.225957885870173,"endHours":16.225957885870173,"planetary_lord":"Moon"},{"name":"Hora 10","start":"16:14","end":"17:14","startHours":16.225957885870173,"endHours":17.225957885870173,"planetary_lord":"Mercury"},{"name":"Hora 11","start":"17:14","end":"18:14","startHours":17.225957885870173,"endHours":18.225957885870173,"planetary_lord":"Venus"},{"name":"Hora 12","start":"18:14","end":"19:14","startHours":18.225957885870173,"endHours":19.225957885870173,"planetary_lord":"Sun"},{"name":"Hora 13","start":"19:14","end":"20:14","startHours":19.225957885870173,"endHours":20.225957885870173,"planetary_lord":"Mars"},{"name":"Hora 14","start":"20:14","end":"21:14","startHours":20.225957885870173,"endHours":21.225957885870173,"planetary_lord":"Jupiter"},{"name":"Hora 15","start":"21:14","end":"22:14","startHours":21.225957885870173,"endHours":22.225957885870173,"planetary_lord":"Saturn"},{"name":"Hora 16","start":"22:14","end":"23:14","startHours":22.225957885870173,"endHours":23.225957885870173,"planetary_lord":"Moon"},{"name":"Hora 17","start":"23:14","end":"00:14","startHours":23.225957885870173,"endHours":24.225957885870173,"planetary_lord":"Mercury"},{"name":"Hora 18","start":"00:14","end":"01:14","startHours":24.225957885870173,"endHours":25.225957885870173,"planetary_lord":"Venus"},{"name":"Hora 19","start":"01:14","end":"02:14","startHours":25.225957885870173,"endHours":26.225957885870173,"planetary_lord":"Sun"},{"name":"Hora 20","start":"02:14","end":"03:14","startHours":26.225957885870173,"endHours":27.225957885870173,"planetary_lord":"Mars"},{"name":"Hora 21","start":"03:14","end":"04:14","startHours":27.225957885870173,"endHours":28.225957885870173,"planetary_lord":"Jupiter"},{"name":"Hora 22","start":"04:14","end":"05:14","startHours":28.225957885870173,"endHours":29.225957885870173,"planetary_lord":"Saturn"},{"name":"Hora 23","start":"05:14","end":"06:14","startHours":29.225957885870173,"endHours":30.225957885870173,"planetary_lord":"Moon"},{"name":"Hora 24","start":"06:14","end":"07:14","startHours":30.225957885870173,"endHours":31.225957885870173,"planetary_lord":"Mercury"}],"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":["Vṛṣabha","Karka","Tulā","Vṛścika","Kumbha","Mīna"],"unfavorable_rashis":["Meṣa","Mithuna","Siṃha","Kanyā","Dhanu","Makara"]},"dishaShool":"East (Pūrva)","chandraVasa":"South-East","rahuVasa":"East","anandadiYoga":{"name":"Dhātṛ","quality":"Auspicious"},"drikRitu":"Hemanta (Pre-winter)","vedicRitu":"Hemanta (Pre-winter)","drikAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":-20.785146709616697,"eotMinutes":-10.026088746108654,"ayanamsa":23.5882}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Māgha","lunar_month_paksha_full":"Māgha Śukla Pakṣa","solar_month":"Makara (Tai)","ritu":"Śiśira (Winter)","display_summary":"Māgha Śukla Dvādaśī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"makara-sankranti","name":"Makara Saṅkrānti (Uttarāyaṇa)","name_sanskrit":"मकर सङ्क्रान्ति","tradition":"Pan-Hindu","associated_deity":"Sūrya Bhagavān","significance":"Sun enters Capricorn; Uttarāyaṇa (north-going) begins. Bhīṣma's chosen mahaprasthāna time.","vrata":true,"detection":{"sun_rashi":"Makara"},"precedence":1,"sources":["Mahābhārata Bhīṣma-Stuti","Sūrya-Siddhānta"]},{"id":"pongal","name":"Pongal / Thai Pongal","name_sanskrit":"पोङ्गल","tradition":"Regional","associated_deity":"Sūrya Bhagavān","significance":"Tamil 4-day harvest festival; coincides with Makara Saṅkrānti.","vrata":false,"detection":{"sun_rashi":"Makara"},"precedence":2}],"todays_walk":{"walk":{"id":"shani-walk","name":"Śani Walk","name_sanskrit":"शनि यात्रा","type":"graha","description":"Tapas + endurance + BG 17.14-19.","step_count":7,"url":"/walk/shani-walk"},"reason":"Śanivāra (Saturday) — its presiding graha's walk."},"cosmic_resonances":[{"historical_date":"-3226-07-09","event":"Bhagavān Krishna's birth at Mathurā","chart_id":"krishna","shared_marker":"same Rohiṇī","url":"/day/-3226-07-09","relevance":0.5}]},"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 January 17, 1981 CE · Ṛṣikeśa · Vidhyamitra","description":"January 17, 1981 CE for Ṛṣikeśa: Śukla Dvādaśī, sūryodaya 07:14, sūryāsta 17:40.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/rishikesh/1981-01-17","hreflang_alternates":{"en":"https://vidhyamitra.com/city/rishikesh/1981-01-17","sa":"https://sa.vidhyamitra.com/city/rishikesh/1981-01-17","hi":"https://hi.vidhyamitra.com/city/rishikesh/1981-01-17","x-default":"https://vidhyamitra.com/city/rishikesh/1981-01-17"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-19T09:32:38.302Z","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":"2026-05-19T09:32:38.302Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-19T09:32:38.302Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}