{"id":"vidhyamitra:city-day:rishikesh:1979-12-31:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/rishikesh/1979-12-31","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1979-12-31","date_display":"December 31, 1979 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":1979,"month":12,"day":31,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444238.770833,"kali_year":5081,"ahargana":1855773.2708,"sun":{"sidereal_longitude":254.9784,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":47.4787,"rashi":2,"rashi_name":"Vṛṣabha"},"tithi":{"number":13,"name":"Trayodaśī","paksha":"Śukla","full_name":"Śukla Trayodaśī","elongation_degrees":152.5002,"elapsed_within_tithi_degrees":8.5002},"nakshatra":{"number":4,"name":"Rohiṇī","pada":3,"moon_longitude":47.4787,"elapsed_within_degrees":7.4787},"yoga":{"number":23,"name":"Śubha","sum_longitude":302.4571},"karana":{"half_tithi_index":25,"name":"Taitila"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"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":1979,"month":12,"day":31,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444238.770833,"ahargana":1855773.2708,"kali_year":5081,"ayanamsa_lahiri":23.5736,"grahas":{"sun":{"sidereal_longitude":255.17766199999994,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":1},"retrograde":false},"moon":{"sidereal_longitude":46.80126200000001,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":3},"retrograde":false,"latitude":-4.4809},"mars":{"sidereal_longitude":140.52036199999998,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":243.18076199999996,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":1},"retrograde":false},"jupiter":{"sidereal_longitude":136.407262,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":1},"retrograde":false},"venus":{"sidereal_longitude":286.92856200000006,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":153.21696199999997,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":2},"retrograde":false},"rahu":{"sidereal_longitude":132.2015,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":312.2015,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","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":1979,"month":12,"day":31,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444238.770833,"kali_year":5081,"ahargana":1855773.2708,"sun":{"sidereal_longitude":254.9784,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":47.4787,"rashi":2,"rashi_name":"Vṛṣabha"},"tithi":{"number":13,"name":"Trayodaśī","paksha":"Śukla","full_name":"Śukla Trayodaśī","elongation_degrees":152.5002,"elapsed_within_tithi_degrees":8.5002},"nakshatra":{"number":4,"name":"Rohiṇī","pada":3,"moon_longitude":47.4787,"elapsed_within_degrees":7.4787},"yoga":{"number":23,"name":"Śubha","sum_longitude":302.4571},"karana":{"half_tithi_index":25,"name":"Taitila"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-4.481,"elongation":152.5},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-4.481,"opposition_distance":27.5}},"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":"07:13","sunsetLocal":"17:27","solarNoonLocal":"12:20","dayLengthHours":10.231601997864699,"dayLengthDisplay":"10 Hours 13 Mins 54 Secs","nightLengthDisplay":"13 Hours 46 Mins 06 Secs","moonriseLocal":"15:30","moonsetLocal":"05:24","rahuKala":{"name":"Rāhu Kāla","start":"08:30","end":"09:47","startHours":8.49957983286416,"endHours":9.778530082597248,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"11:03","end":"12:20","startHours":11.057480332330336,"endHours":12.336430582063421,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"13:37","end":"14:54","startHours":13.61538083179651,"endHours":14.894331081529597,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:36","end":"09:57","startHours":9.608003382632836,"endHours":9.949056782561659,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:39","end":"07:55","startHours":7.646946333042102,"endHours":7.919789052985161,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:00","end":"12:41","startHours":11.995377182134598,"endHours":12.677483981992244,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:51","end":"06:32","startHours":5.85641598341578,"endHours":6.538522783273426,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"06:22","end":"07:13","startHours":6.367996083309015,"endHours":7.220629583131073,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:03","end":"14:43","startHours":14.041697581707538,"endHours":14.723804381565184,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:15","end":"17:39","startHours":17.252231580995772,"endHours":17.65223158099577,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:27","end":"17:53","startHours":17.45223158099577,"endHours":17.8785483309068,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:12","end":"18:57","startHours":17.20223158099577,"endHours":18.95223158099577,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:00","end":"00:41","startHours":23.995377182134597,"endHours":24.677483981992246,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Amṛta","start":"07:13","end":"08:30","startHours":7.220629583131073,"endHours":8.49957983286416,"quality":"auspicious"},{"name":"Kāla","start":"08:30","end":"09:47","startHours":8.49957983286416,"endHours":9.778530082597248,"quality":"inauspicious"},{"name":"Śubha","start":"09:47","end":"11:03","startHours":9.778530082597248,"endHours":11.057480332330336,"quality":"auspicious"},{"name":"Roga","start":"11:03","end":"12:20","startHours":11.057480332330336,"endHours":12.336430582063421,"quality":"inauspicious"},{"name":"Udveg","start":"12:20","end":"13:37","startHours":12.336430582063421,"endHours":13.61538083179651,"quality":"inauspicious"},{"name":"Chala","start":"13:37","end":"14:54","startHours":13.61538083179651,"endHours":14.894331081529597,"quality":"neutral"},{"name":"Labha","start":"14:54","end":"16:10","startHours":14.894331081529597,"endHours":16.173281331262686,"quality":"auspicious"},{"name":"Amṛta","start":"16:10","end":"17:27","startHours":16.173281331262686,"endHours":17.45223158099577,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Chala","start":"17:27","end":"19:10","startHours":17.45223158099577,"endHours":19.173281331262686,"quality":"neutral"},{"name":"Labha","start":"19:10","end":"20:54","startHours":19.173281331262686,"endHours":20.894331081529597,"quality":"auspicious"},{"name":"Amṛta","start":"20:54","end":"22:37","startHours":20.894331081529597,"endHours":22.61538083179651,"quality":"auspicious"},{"name":"Kāla","start":"22:37","end":"00:20","startHours":22.61538083179651,"endHours":24.33643058206342,"quality":"inauspicious"},{"name":"Śubha","start":"00:20","end":"02:03","startHours":24.33643058206342,"endHours":26.057480332330336,"quality":"auspicious"},{"name":"Roga","start":"02:03","end":"03:47","startHours":26.057480332330336,"endHours":27.77853008259725,"quality":"inauspicious"},{"name":"Udveg","start":"03:47","end":"05:30","startHours":27.77853008259725,"endHours":29.49957983286416,"quality":"inauspicious"},{"name":"Chala","start":"05:30","end":"07:13","startHours":29.49957983286416,"endHours":31.22062958313107,"quality":"neutral"}],"horas":[{"name":"Hora 1","start":"07:13","end":"08:13","startHours":7.220629583131073,"endHours":8.220629583131073,"planetary_lord":"Moon"},{"name":"Hora 2","start":"08:13","end":"09:13","startHours":8.220629583131073,"endHours":9.220629583131073,"planetary_lord":"Mercury"},{"name":"Hora 3","start":"09:13","end":"10:13","startHours":9.220629583131073,"endHours":10.220629583131073,"planetary_lord":"Venus"},{"name":"Hora 4","start":"10:13","end":"11:13","startHours":10.220629583131073,"endHours":11.220629583131073,"planetary_lord":"Sun"},{"name":"Hora 5","start":"11:13","end":"12:13","startHours":11.220629583131073,"endHours":12.220629583131073,"planetary_lord":"Mars"},{"name":"Hora 6","start":"12:13","end":"13:13","startHours":12.220629583131073,"endHours":13.220629583131073,"planetary_lord":"Jupiter"},{"name":"Hora 7","start":"13:13","end":"14:13","startHours":13.220629583131073,"endHours":14.220629583131073,"planetary_lord":"Saturn"},{"name":"Hora 8","start":"14:13","end":"15:13","startHours":14.220629583131073,"endHours":15.220629583131073,"planetary_lord":"Moon"},{"name":"Hora 9","start":"15:13","end":"16:13","startHours":15.220629583131073,"endHours":16.22062958313107,"planetary_lord":"Mercury"},{"name":"Hora 10","start":"16:13","end":"17:13","startHours":16.22062958313107,"endHours":17.22062958313107,"planetary_lord":"Venus"},{"name":"Hora 11","start":"17:13","end":"18:13","startHours":17.22062958313107,"endHours":18.22062958313107,"planetary_lord":"Sun"},{"name":"Hora 12","start":"18:13","end":"19:13","startHours":18.22062958313107,"endHours":19.22062958313107,"planetary_lord":"Mars"},{"name":"Hora 13","start":"19:13","end":"20:13","startHours":19.22062958313107,"endHours":20.22062958313107,"planetary_lord":"Jupiter"},{"name":"Hora 14","start":"20:13","end":"21:13","startHours":20.22062958313107,"endHours":21.22062958313107,"planetary_lord":"Saturn"},{"name":"Hora 15","start":"21:13","end":"22:13","startHours":21.22062958313107,"endHours":22.22062958313107,"planetary_lord":"Moon"},{"name":"Hora 16","start":"22:13","end":"23:13","startHours":22.22062958313107,"endHours":23.22062958313107,"planetary_lord":"Mercury"},{"name":"Hora 17","start":"23:13","end":"00:13","startHours":23.22062958313107,"endHours":24.22062958313107,"planetary_lord":"Venus"},{"name":"Hora 18","start":"00:13","end":"01:13","startHours":24.22062958313107,"endHours":25.22062958313107,"planetary_lord":"Sun"},{"name":"Hora 19","start":"01:13","end":"02:13","startHours":25.22062958313107,"endHours":26.22062958313107,"planetary_lord":"Mars"},{"name":"Hora 20","start":"02:13","end":"03:13","startHours":26.22062958313107,"endHours":27.22062958313107,"planetary_lord":"Jupiter"},{"name":"Hora 21","start":"03:13","end":"04:13","startHours":27.22062958313107,"endHours":28.22062958313107,"planetary_lord":"Saturn"},{"name":"Hora 22","start":"04:13","end":"05:13","startHours":28.22062958313107,"endHours":29.22062958313107,"planetary_lord":"Moon"},{"name":"Hora 23","start":"05:13","end":"06:13","startHours":29.22062958313107,"endHours":30.22062958313107,"planetary_lord":"Mercury"},{"name":"Hora 24","start":"06:13","end":"07:13","startHours":30.22062958313107,"endHours":31.22062958313107,"planetary_lord":"Venus"}],"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":"North-East","anandadiYoga":{"name":"Śrīvatsa","quality":"Auspicious"},"tropicalRitu":"Hemanta (Pre-winter) (tropical)","vedicRitu":"Hemanta (Pre-winter)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-23.147660810475102,"eotMinutes":-3.2562349238053434,"ayanamsa":23.5736}},"calendars":{"vikram_samvat":2036,"vikram_samvatsara":"Aṅgirasa","saka_samvat":1901,"saka_samvatsara":"Siddhārthī","bengali_samvat":1386,"malayalam_era":1155,"nanakshahi_year":510,"lunar_month":"Pauṣa","lunar_month_paksha_full":"Pauṣa Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Pauṣa","lunar_month_amanta":"Pauṣa","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Dhanus (Mārgaḻi)","ritu":"Hemanta (Pre-winter)","display_summary":"Pauṣa Śukla Trayodaśī · Vikram 2036 Aṅgirasa · Śaka 1901 Siddhārthī"},"festivals":[{"id":"pradosha-vrata","name":"Pradoṣa Vrata","name_sanskrit":"प्रदोष व्रत","tradition":"Shaiva","associated_deity":"Śiva","significance":"Twilight worship of Śiva on Trayodaśī.","vrata":true,"detection":{"any_of":[{"tithi_number":13},{"tithi_number":28}]},"precedence":7}],"todays_walk":{"walk":{"id":"chandra-walk","name":"Candra Walk","name_sanskrit":"चन्द्र यात्रा","type":"graha","description":"Manas-control + BG 6.5-7.","step_count":5,"url":"/walk/chandra-walk"},"reason":"Somavāra (Monday) — 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 December 31, 1979 CE · Ṛṣikeśa · Vidhyamitra","description":"December 31, 1979 CE for Ṛṣikeśa: Śukla Trayodaśī, sūryodaya 07:13, sūryāsta 17:27.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/rishikesh/1979-12-31","hreflang_alternates":{"en":"https://vidhyamitra.com/city/rishikesh/1979-12-31","sa":"https://sa.vidhyamitra.com/city/rishikesh/1979-12-31","hi":"https://hi.vidhyamitra.com/city/rishikesh/1979-12-31","x-default":"https://vidhyamitra.com/city/rishikesh/1979-12-31"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-31T01:30:51.276Z","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":"2026-05-31T01:30:51.276Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-31T01:30:51.276Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}