{"id":"vidhyamitra:city-day:rishikesh:1980-03-13:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/rishikesh/1980-03-13","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1980-03-13","date_display":"March 13, 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":3,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444311.770833,"kali_year":5081,"ahargana":1855846.2708,"sun":{"sidereal_longitude":329.2685,"rashi":11,"rashi_name":"Kumbha"},"moon":{"sidereal_longitude":279.6067,"rashi":10,"rashi_name":"Makara"},"tithi":{"number":26,"name":"Ekādaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Ekādaśī","elongation_degrees":310.3383,"elapsed_within_tithi_degrees":10.3383},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":4,"moon_longitude":279.6067,"elapsed_within_degrees":12.9401},"yoga":{"number":19,"name":"Parigha","sum_longitude":248.8752},"karana":{"half_tithi_index":51,"name":"Bālava"},"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":3,"day":13,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444311.770833,"ahargana":1855846.2708,"kali_year":5081,"ayanamsa_lahiri":23.5764,"grahas":{"sun":{"sidereal_longitude":329.046473,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":3},"retrograde":false},"moon":{"sidereal_longitude":277.12407299999995,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":4},"retrograde":false,"latitude":2.1611},"mars":{"sidereal_longitude":126.33777299999997,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":2},"retrograde":true},"mercury":{"sidereal_longitude":316.4088730000001,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":3},"retrograde":true},"jupiter":{"sidereal_longitude":129.320673,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":3},"retrograde":true},"venus":{"sidereal_longitude":13.733173000000022,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":2,"name":"Bharaṇī","pada":1},"retrograde":false},"saturn":{"sidereal_longitude":149.99087300000002,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":128.3336,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":3},"retrograde":false},"ketu":{"sidereal_longitude":308.3336,"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":3,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444311.770833,"kali_year":5081,"ahargana":1855846.2708,"sun":{"sidereal_longitude":329.2685,"rashi":11,"rashi_name":"Kumbha"},"moon":{"sidereal_longitude":279.6067,"rashi":10,"rashi_name":"Makara"},"tithi":{"number":26,"name":"Ekādaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Ekādaśī","elongation_degrees":310.3383,"elapsed_within_tithi_degrees":10.3383},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":4,"moon_longitude":279.6067,"elapsed_within_degrees":12.9401},"yoga":{"number":19,"name":"Parigha","sum_longitude":248.8752},"karana":{"half_tithi_index":51,"name":"Bālava"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":2.161,"elongation":49.662},"lunar":{"type":"lunar","occurs":false,"moon_latitude":2.161,"opposition_distance":130.338}},"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":"06:30","sunsetLocal":"18:24","solarNoonLocal":"12:27","dayLengthHours":11.902191494509026,"dayLengthDisplay":"11 Hours 54 Mins 08 Secs","nightLengthDisplay":"12 Hours 05 Mins 52 Secs","moonriseLocal":"03:45","moonsetLocal":"14:14","rahuKala":{"name":"Rāhu Kāla","start":"13:56","end":"15:26","startHours":13.940232602293776,"endHours":15.428006539107404,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"06:30","end":"07:59","startHours":6.5013629182256345,"endHours":7.989136855039263,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"09:29","end":"10:58","startHours":9.476910791852891,"endHours":10.96468472866652,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:17","end":"09:41","startHours":9.278540933611074,"endHours":9.675280650094708,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:00","end":"07:19","startHours":6.997287563830177,"endHours":7.314679337017084,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:03","end":"12:51","startHours":12.055718948996514,"endHours":12.849198381963781,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:55","end":"05:42","startHours":4.914404052291098,"endHours":5.707883485258366,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:31","end":"06:30","startHours":5.509513627016549,"endHours":6.5013629182256345,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:26","end":"15:14","startHours":14.436157247898318,"endHours":15.229636680865587,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:12","end":"18:36","startHours":18.20355441273466,"endHours":18.60355441273466,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:24","end":"18:54","startHours":18.40355441273466,"endHours":18.899479058339203,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:09","end":"19:54","startHours":18.15355441273466,"endHours":19.90355441273466,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:03","end":"00:51","startHours":24.055718948996514,"endHours":24.84919838196378,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Śubha","start":"06:30","end":"07:59","startHours":6.5013629182256345,"endHours":7.989136855039263,"quality":"auspicious"},{"name":"Roga","start":"07:59","end":"09:29","startHours":7.989136855039263,"endHours":9.476910791852891,"quality":"inauspicious"},{"name":"Udveg","start":"09:29","end":"10:58","startHours":9.476910791852891,"endHours":10.96468472866652,"quality":"inauspicious"},{"name":"Chala","start":"10:58","end":"12:27","startHours":10.96468472866652,"endHours":12.452458665480147,"quality":"neutral"},{"name":"Labha","start":"12:27","end":"13:56","startHours":12.452458665480147,"endHours":13.940232602293776,"quality":"auspicious"},{"name":"Amṛta","start":"13:56","end":"15:26","startHours":13.940232602293776,"endHours":15.428006539107404,"quality":"auspicious"},{"name":"Kāla","start":"15:26","end":"16:55","startHours":15.428006539107404,"endHours":16.915780475921032,"quality":"inauspicious"},{"name":"Śubha","start":"16:55","end":"18:24","startHours":16.915780475921032,"endHours":18.40355441273466,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Amṛta","start":"18:24","end":"19:55","startHours":18.40355441273466,"endHours":19.915780475921032,"quality":"auspicious"},{"name":"Kāla","start":"19:55","end":"21:26","startHours":19.915780475921032,"endHours":21.428006539107404,"quality":"inauspicious"},{"name":"Śubha","start":"21:26","end":"22:56","startHours":21.428006539107404,"endHours":22.940232602293776,"quality":"auspicious"},{"name":"Roga","start":"22:56","end":"00:27","startHours":22.940232602293776,"endHours":24.452458665480147,"quality":"inauspicious"},{"name":"Udveg","start":"00:27","end":"01:58","startHours":24.452458665480147,"endHours":25.96468472866652,"quality":"inauspicious"},{"name":"Chala","start":"01:58","end":"03:29","startHours":25.96468472866652,"endHours":27.47691079185289,"quality":"neutral"},{"name":"Labha","start":"03:29","end":"04:59","startHours":27.47691079185289,"endHours":28.989136855039263,"quality":"auspicious"},{"name":"Amṛta","start":"04:59","end":"06:30","startHours":28.989136855039263,"endHours":30.501362918225635,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"06:30","end":"07:30","startHours":6.5013629182256345,"endHours":7.5013629182256345,"planetary_lord":"Jupiter"},{"name":"Hora 2","start":"07:30","end":"08:30","startHours":7.5013629182256345,"endHours":8.501362918225635,"planetary_lord":"Saturn"},{"name":"Hora 3","start":"08:30","end":"09:30","startHours":8.501362918225635,"endHours":9.501362918225635,"planetary_lord":"Moon"},{"name":"Hora 4","start":"09:30","end":"10:30","startHours":9.501362918225635,"endHours":10.501362918225635,"planetary_lord":"Mercury"},{"name":"Hora 5","start":"10:30","end":"11:30","startHours":10.501362918225635,"endHours":11.501362918225635,"planetary_lord":"Venus"},{"name":"Hora 6","start":"11:30","end":"12:30","startHours":11.501362918225635,"endHours":12.501362918225635,"planetary_lord":"Sun"},{"name":"Hora 7","start":"12:30","end":"13:30","startHours":12.501362918225635,"endHours":13.501362918225635,"planetary_lord":"Mars"},{"name":"Hora 8","start":"13:30","end":"14:30","startHours":13.501362918225635,"endHours":14.501362918225635,"planetary_lord":"Jupiter"},{"name":"Hora 9","start":"14:30","end":"15:30","startHours":14.501362918225635,"endHours":15.501362918225635,"planetary_lord":"Saturn"},{"name":"Hora 10","start":"15:30","end":"16:30","startHours":15.501362918225635,"endHours":16.501362918225635,"planetary_lord":"Moon"},{"name":"Hora 11","start":"16:30","end":"17:30","startHours":16.501362918225635,"endHours":17.501362918225635,"planetary_lord":"Mercury"},{"name":"Hora 12","start":"17:30","end":"18:30","startHours":17.501362918225635,"endHours":18.501362918225635,"planetary_lord":"Venus"},{"name":"Hora 13","start":"18:30","end":"19:30","startHours":18.501362918225635,"endHours":19.501362918225635,"planetary_lord":"Sun"},{"name":"Hora 14","start":"19:30","end":"20:30","startHours":19.501362918225635,"endHours":20.501362918225635,"planetary_lord":"Mars"},{"name":"Hora 15","start":"20:30","end":"21:30","startHours":20.501362918225635,"endHours":21.501362918225635,"planetary_lord":"Jupiter"},{"name":"Hora 16","start":"21:30","end":"22:30","startHours":21.501362918225635,"endHours":22.501362918225635,"planetary_lord":"Saturn"},{"name":"Hora 17","start":"22:30","end":"23:30","startHours":22.501362918225635,"endHours":23.501362918225635,"planetary_lord":"Moon"},{"name":"Hora 18","start":"23:30","end":"00:30","startHours":23.501362918225635,"endHours":24.501362918225635,"planetary_lord":"Mercury"},{"name":"Hora 19","start":"00:30","end":"01:30","startHours":24.501362918225635,"endHours":25.501362918225635,"planetary_lord":"Venus"},{"name":"Hora 20","start":"01:30","end":"02:30","startHours":25.501362918225635,"endHours":26.501362918225635,"planetary_lord":"Sun"},{"name":"Hora 21","start":"02:30","end":"03:30","startHours":26.501362918225635,"endHours":27.501362918225635,"planetary_lord":"Mars"},{"name":"Hora 22","start":"03:30","end":"04:30","startHours":27.501362918225635,"endHours":28.501362918225635,"planetary_lord":"Jupiter"},{"name":"Hora 23","start":"04:30","end":"05:30","startHours":28.501362918225635,"endHours":29.501362918225635,"planetary_lord":"Saturn"},{"name":"Hora 24","start":"05:30","end":"06:30","startHours":29.501362918225635,"endHours":30.501362918225635,"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"},"tropicalRitu":"Śiśira (Winter) (tropical)","vedicRitu":"Śiśira (Winter)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-2.9272960143095608,"eotMinutes":-10.217919928808794,"ayanamsa":23.5764}},"calendars":{"vikram_samvat":2037,"vikram_samvatsara":"Śrīmukha","saka_samvat":1902,"saka_samvatsara":"Raudra","bengali_samvat":1387,"malayalam_era":1156,"nanakshahi_year":511,"lunar_month":"Caitra","lunar_month_paksha_full":"Caitra Kṛṣṇa Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Caitra","lunar_month_amanta":"Phālguna","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Kumbha (Māsi)","ritu":"Vasanta (Spring)","display_summary":"Caitra Kṛṣṇa Ekādaśī · Vikram 2037 Śrīmukha · Śaka 1902 Raudra"},"festivals":[{"id":"papamochani-ekadashi","name":"Pāpamocanī Ekādaśī","name_sanskrit":"पापमोचनी एकादशी","tradition":"Vaishnava","associated_deity":"Bhagavān Viṣṇu","significance":"Removes mahā-pātakas (great sins).","vrata":true,"detection":{"tithi_number":26,"tithi_paksha":"Kṛṣṇa","lunar_month":"Caitra"},"precedence":4},{"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}],"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 March 13, 1980 CE · Ṛṣikeśa · Vidhyamitra","description":"March 13, 1980 CE for Ṛṣikeśa: Kṛṣṇa Ekādaśī, sūryodaya 06:30, sūryāsta 18:24.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/rishikesh/1980-03-13","hreflang_alternates":{"en":"https://vidhyamitra.com/city/rishikesh/1980-03-13","sa":"https://sa.vidhyamitra.com/city/rishikesh/1980-03-13","hi":"https://hi.vidhyamitra.com/city/rishikesh/1980-03-13","x-default":"https://vidhyamitra.com/city/rishikesh/1980-03-13"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-31T00:11:09.867Z","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":"2026-05-31T00:11:09.867Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-31T00:11:09.867Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}