{"id":"vidhyamitra:city-day:rishikesh:1980-04-12:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/rishikesh/1980-04-12","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1980-04-12","date_display":"April 12, 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":4,"day":12,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444341.770833,"kali_year":5081,"ahargana":1855876.2708,"sun":{"sidereal_longitude":358.8982,"rashi":12,"rashi_name":"Mīna"},"moon":{"sidereal_longitude":317.5297,"rashi":11,"rashi_name":"Kumbha"},"tithi":{"number":27,"name":"Dvādaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Dvādaśī","elongation_degrees":318.6315,"elapsed_within_tithi_degrees":6.6315},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":4,"moon_longitude":317.5297,"elapsed_within_degrees":10.863},"yoga":{"number":24,"name":"Śukla","sum_longitude":316.4279},"karana":{"half_tithi_index":53,"name":"Taitila"},"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":1980,"month":4,"day":12,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444341.770833,"ahargana":1855876.2708,"kali_year":5081,"ayanamsa_lahiri":23.5775,"grahas":{"sun":{"sidereal_longitude":358.714327,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":4},"retrograde":false},"moon":{"sidereal_longitude":314.886927,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":3},"retrograde":false,"latitude":-0.8413},"mars":{"sidereal_longitude":122.77042700000004,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":1},"retrograde":true},"mercury":{"sidereal_longitude":333.0216270000001,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":126.81482700000004,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":3},"retrograde":true},"venus":{"sidereal_longitude":44.69192700000002,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":147.772127,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":126.7441,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":3},"retrograde":false},"ketu":{"sidereal_longitude":306.7441,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":1},"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":4,"day":12,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444341.770833,"kali_year":5081,"ahargana":1855876.2708,"sun":{"sidereal_longitude":358.8982,"rashi":12,"rashi_name":"Mīna"},"moon":{"sidereal_longitude":317.5297,"rashi":11,"rashi_name":"Kumbha"},"tithi":{"number":27,"name":"Dvādaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Dvādaśī","elongation_degrees":318.6315,"elapsed_within_tithi_degrees":6.6315},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":4,"moon_longitude":317.5297,"elapsed_within_degrees":10.863},"yoga":{"number":24,"name":"Śukla","sum_longitude":316.4279},"karana":{"half_tithi_index":53,"name":"Taitila"},"vara":{"number":1,"name":"Śanivāra (Saturday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-0.841,"elongation":41.369},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-0.841,"opposition_distance":138.631}},"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":"05:54","sunsetLocal":"18:42","solarNoonLocal":"12:18","dayLengthHours":12.806836754199075,"dayLengthDisplay":"12 Hours 48 Mins 25 Secs","nightLengthDisplay":"11 Hours 11 Mins 35 Secs","moonriseLocal":"03:40","moonsetLocal":"15:06","rahuKala":{"name":"Rāhu Kāla","start":"09:06","end":"10:42","startHours":9.097842497442588,"endHours":10.698697091717472,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"13:54","end":"15:30","startHours":13.90040628026724,"endHours":15.501260874542126,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"05:54","end":"07:30","startHours":5.896133308892819,"endHours":7.496987903167703,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:53","end":"09:19","startHours":8.884395218205936,"endHours":9.311289776679239,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:26","end":"06:46","startHours":6.429751506984447,"endHours":6.771267153763089,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:52","end":"12:44","startHours":11.872657127519053,"endHours":12.726446244465658,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:11","end":"05:03","startHours":4.188555074999609,"endHours":5.0423441919462135,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:50","end":"05:54","startHours":4.8288969127095625,"endHours":5.896133308892819,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:26","end":"15:17","startHours":14.434024478358868,"endHours":15.287813595305472,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:30","end":"18:54","startHours":18.502970063091894,"endHours":18.902970063091892,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:42","end":"19:14","startHours":18.702970063091893,"endHours":19.23658826118352,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:27","end":"20:12","startHours":18.452970063091893,"endHours":20.202970063091893,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:52","end":"00:44","startHours":23.87265712751905,"endHours":24.72644624446566,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Kāla","start":"05:54","end":"07:30","startHours":5.896133308892819,"endHours":7.496987903167703,"quality":"inauspicious"},{"name":"Śubha","start":"07:30","end":"09:06","startHours":7.496987903167703,"endHours":9.097842497442588,"quality":"auspicious"},{"name":"Roga","start":"09:06","end":"10:42","startHours":9.097842497442588,"endHours":10.698697091717472,"quality":"inauspicious"},{"name":"Udveg","start":"10:42","end":"12:18","startHours":10.698697091717472,"endHours":12.299551685992355,"quality":"inauspicious"},{"name":"Chala","start":"12:18","end":"13:54","startHours":12.299551685992355,"endHours":13.90040628026724,"quality":"neutral"},{"name":"Labha","start":"13:54","end":"15:30","startHours":13.90040628026724,"endHours":15.501260874542126,"quality":"auspicious"},{"name":"Amṛta","start":"15:30","end":"17:06","startHours":15.501260874542126,"endHours":17.102115468817008,"quality":"auspicious"},{"name":"Kāla","start":"17:06","end":"18:42","startHours":17.102115468817008,"endHours":18.702970063091893,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Labha","start":"18:42","end":"20:06","startHours":18.702970063091893,"endHours":20.102115468817008,"quality":"auspicious"},{"name":"Amṛta","start":"20:06","end":"21:30","startHours":20.102115468817008,"endHours":21.501260874542126,"quality":"auspicious"},{"name":"Kāla","start":"21:30","end":"22:54","startHours":21.501260874542126,"endHours":22.90040628026724,"quality":"inauspicious"},{"name":"Śubha","start":"22:54","end":"00:18","startHours":22.90040628026724,"endHours":24.299551685992355,"quality":"auspicious"},{"name":"Roga","start":"00:18","end":"01:42","startHours":24.299551685992355,"endHours":25.69869709171747,"quality":"inauspicious"},{"name":"Udveg","start":"01:42","end":"03:06","startHours":25.69869709171747,"endHours":27.097842497442585,"quality":"inauspicious"},{"name":"Chala","start":"03:06","end":"04:30","startHours":27.097842497442585,"endHours":28.496987903167703,"quality":"neutral"},{"name":"Labha","start":"04:30","end":"05:54","startHours":28.496987903167703,"endHours":29.896133308892818,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"05:54","end":"06:54","startHours":5.896133308892819,"endHours":6.896133308892819,"planetary_lord":"Saturn"},{"name":"Hora 2","start":"06:54","end":"07:54","startHours":6.896133308892819,"endHours":7.896133308892819,"planetary_lord":"Moon"},{"name":"Hora 3","start":"07:54","end":"08:54","startHours":7.896133308892819,"endHours":8.896133308892818,"planetary_lord":"Mercury"},{"name":"Hora 4","start":"08:54","end":"09:54","startHours":8.896133308892818,"endHours":9.896133308892818,"planetary_lord":"Venus"},{"name":"Hora 5","start":"09:54","end":"10:54","startHours":9.896133308892818,"endHours":10.896133308892818,"planetary_lord":"Sun"},{"name":"Hora 6","start":"10:54","end":"11:54","startHours":10.896133308892818,"endHours":11.896133308892818,"planetary_lord":"Mars"},{"name":"Hora 7","start":"11:54","end":"12:54","startHours":11.896133308892818,"endHours":12.896133308892818,"planetary_lord":"Jupiter"},{"name":"Hora 8","start":"12:54","end":"13:54","startHours":12.896133308892818,"endHours":13.896133308892818,"planetary_lord":"Saturn"},{"name":"Hora 9","start":"13:54","end":"14:54","startHours":13.896133308892818,"endHours":14.896133308892818,"planetary_lord":"Moon"},{"name":"Hora 10","start":"14:54","end":"15:54","startHours":14.896133308892818,"endHours":15.896133308892818,"planetary_lord":"Mercury"},{"name":"Hora 11","start":"15:54","end":"16:54","startHours":15.896133308892818,"endHours":16.896133308892818,"planetary_lord":"Venus"},{"name":"Hora 12","start":"16:54","end":"17:54","startHours":16.896133308892818,"endHours":17.896133308892818,"planetary_lord":"Sun"},{"name":"Hora 13","start":"17:54","end":"18:54","startHours":17.896133308892818,"endHours":18.896133308892818,"planetary_lord":"Mars"},{"name":"Hora 14","start":"18:54","end":"19:54","startHours":18.896133308892818,"endHours":19.896133308892818,"planetary_lord":"Jupiter"},{"name":"Hora 15","start":"19:54","end":"20:54","startHours":19.896133308892818,"endHours":20.896133308892818,"planetary_lord":"Saturn"},{"name":"Hora 16","start":"20:54","end":"21:54","startHours":20.896133308892818,"endHours":21.896133308892818,"planetary_lord":"Moon"},{"name":"Hora 17","start":"21:54","end":"22:54","startHours":21.896133308892818,"endHours":22.896133308892818,"planetary_lord":"Mercury"},{"name":"Hora 18","start":"22:54","end":"23:54","startHours":22.896133308892818,"endHours":23.896133308892818,"planetary_lord":"Venus"},{"name":"Hora 19","start":"23:54","end":"00:54","startHours":23.896133308892818,"endHours":24.896133308892818,"planetary_lord":"Sun"},{"name":"Hora 20","start":"00:54","end":"01:54","startHours":24.896133308892818,"endHours":25.896133308892818,"planetary_lord":"Mars"},{"name":"Hora 21","start":"01:54","end":"02:54","startHours":25.896133308892818,"endHours":26.896133308892818,"planetary_lord":"Jupiter"},{"name":"Hora 22","start":"02:54","end":"03:54","startHours":26.896133308892818,"endHours":27.896133308892818,"planetary_lord":"Saturn"},{"name":"Hora 23","start":"03:54","end":"04:54","startHours":27.896133308892818,"endHours":28.896133308892818,"planetary_lord":"Moon"},{"name":"Hora 24","start":"04:54","end":"05:54","startHours":28.896133308892818,"endHours":29.896133308892818,"planetary_lord":"Mercury"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Punarvasu","Puṣya","Aśleṣā","Maghā","Pūrva Phalgunī","Viśākhā","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Kṛttikā","Rohiṇī","Mṛgaśirā","Ārdrā","Uttara Phalgunī","Hasta","Citrā","Svātī","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Meṣa","Karka","Siṃha","Vṛścika","Dhanu","Kumbha"],"unfavorable_rashis":["Vṛṣabha","Mithuna","Kanyā","Tulā","Makara","Mīna"]},"dishaShool":"East (Pūrva)","chandraVasa":"South","rahuVasa":"East","anandadiYoga":{"name":"Śubha","quality":"Auspicious"},"tropicalRitu":"Vasanta (Spring) (tropical)","vedicRitu":"Śiśira (Winter)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":8.677320970530868,"eotMinutes":-1.043501159541278,"ayanamsa":23.5775}},"calendars":{"vikram_samvat":2037,"vikram_samvatsara":"Śrīmukha","saka_samvat":1902,"saka_samvatsara":"Raudra","bengali_samvat":1387,"malayalam_era":1156,"nanakshahi_year":511,"lunar_month":"Vaiśākha","lunar_month_paksha_full":"Vaiśākha Kṛṣṇa Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Vaiśākha","lunar_month_amanta":"Caitra","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Mīna (Paṅkuṇi)","ritu":"Vasanta (Spring)","display_summary":"Vaiśākha Kṛṣṇa Dvādaśī · Vikram 2037 Śrīmukha · Śaka 1902 Raudra"},"festivals":[],"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":[]},"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 April 12, 1980 CE · Ṛṣikeśa · Vidhyamitra","description":"April 12, 1980 CE for Ṛṣikeśa: Kṛṣṇa Dvādaśī, sūryodaya 05:54, sūryāsta 18:42.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/rishikesh/1980-04-12","hreflang_alternates":{"en":"https://vidhyamitra.com/city/rishikesh/1980-04-12","sa":"https://sa.vidhyamitra.com/city/rishikesh/1980-04-12","hi":"https://hi.vidhyamitra.com/city/rishikesh/1980-04-12","x-default":"https://vidhyamitra.com/city/rishikesh/1980-04-12"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-01T10:38:18.988Z","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":"2026-06-01T10:38:18.988Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-01T10:38:18.988Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}