{"id":"vidhyamitra:city-day:rishikesh:1980-02-07:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/rishikesh/1980-02-07","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1980-02-07","date_display":"February 7, 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":2,"day":7,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444276.770833,"kali_year":5081,"ahargana":1855811.2708,"sun":{"sidereal_longitude":293.9392,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":182.3019,"rashi":7,"rashi_name":"Tulā"},"tithi":{"number":21,"name":"Ṣaṣṭhī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Ṣaṣṭhī","elongation_degrees":248.3627,"elapsed_within_tithi_degrees":8.3627},"nakshatra":{"number":14,"name":"Citrā","pada":3,"moon_longitude":182.3019,"elapsed_within_degrees":8.9686},"yoga":{"number":9,"name":"Śūla","sum_longitude":116.2412},"karana":{"half_tithi_index":41,"name":"Vaṇija"},"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":2,"day":7,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444276.770833,"ahargana":1855811.2708,"kali_year":5081,"ayanamsa_lahiri":23.575,"grahas":{"sun":{"sidereal_longitude":293.84001,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":1},"retrograde":false},"moon":{"sidereal_longitude":178.47801000000004,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":2},"retrograde":false,"latitude":3.5502},"mars":{"sidereal_longitude":138.95641,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":2},"retrograde":false},"mercury":{"sidereal_longitude":306.17901000000006,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":133.73121000000003,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":1},"retrograde":true},"venus":{"sidereal_longitude":333.18130999999994,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":4},"retrograde":false},"saturn":{"sidereal_longitude":152.42791,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":2},"retrograde":true},"rahu":{"sidereal_longitude":130.1881,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":310.1881,"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":1980,"month":2,"day":7,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444276.770833,"kali_year":5081,"ahargana":1855811.2708,"sun":{"sidereal_longitude":293.9392,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":182.3019,"rashi":7,"rashi_name":"Tulā"},"tithi":{"number":21,"name":"Ṣaṣṭhī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Ṣaṣṭhī","elongation_degrees":248.3627,"elapsed_within_tithi_degrees":8.3627},"nakshatra":{"number":14,"name":"Citrā","pada":3,"moon_longitude":182.3019,"elapsed_within_degrees":8.9686},"yoga":{"number":9,"name":"Śūla","sum_longitude":116.2412},"karana":{"half_tithi_index":41,"name":"Vaṇija"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":3.55,"elongation":111.637},"lunar":{"type":"lunar","occurs":false,"moon_latitude":3.55,"opposition_distance":68.363}},"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":"07:05","sunsetLocal":"17:58","solarNoonLocal":"12:31","dayLengthHours":10.892526859624729,"dayLengthDisplay":"10 Hours 53 Mins 33 Secs","nightLengthDisplay":"13 Hours 06 Mins 27 Secs","moonriseLocal":"23:07","moonsetLocal":"10:33","rahuKala":{"name":"Rāhu Kāla","start":"13:53","end":"15:15","startHours":13.88335339927587,"endHours":15.244919256728961,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"07:05","end":"08:26","startHours":7.075524112010415,"endHours":8.437089969463505,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"09:48","end":"11:10","startHours":9.798655826916598,"endHours":11.160221684369688,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:37","end":"09:59","startHours":9.617113712589518,"endHours":9.980197941243675,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:32","end":"07:49","startHours":7.529379397828112,"endHours":7.819846780751439,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:10","end":"12:53","startHours":12.15870331316862,"endHours":12.884871770476936,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:37","end":"06:21","startHours":5.623187197393785,"endHours":6.3493556547021,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"06:10","end":"07:05","startHours":6.167813540375021,"endHours":7.075524112010415,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:20","end":"15:04","startHours":14.337208685093568,"endHours":15.063377142401883,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:46","end":"18:10","startHours":17.768050971635144,"endHours":18.168050971635143,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:58","end":"18:25","startHours":17.968050971635144,"endHours":18.42190625745284,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:43","end":"19:28","startHours":17.718050971635144,"endHours":19.468050971635144,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:10","end":"00:53","startHours":24.15870331316862,"endHours":24.884871770476938,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Śubha","start":"07:05","end":"08:26","startHours":7.075524112010415,"endHours":8.437089969463505,"quality":"auspicious"},{"name":"Roga","start":"08:26","end":"09:48","startHours":8.437089969463505,"endHours":9.798655826916598,"quality":"inauspicious"},{"name":"Udveg","start":"09:48","end":"11:10","startHours":9.798655826916598,"endHours":11.160221684369688,"quality":"inauspicious"},{"name":"Chala","start":"11:10","end":"12:31","startHours":11.160221684369688,"endHours":12.521787541822778,"quality":"neutral"},{"name":"Labha","start":"12:31","end":"13:53","startHours":12.521787541822778,"endHours":13.88335339927587,"quality":"auspicious"},{"name":"Amṛta","start":"13:53","end":"15:15","startHours":13.88335339927587,"endHours":15.244919256728961,"quality":"auspicious"},{"name":"Kāla","start":"15:15","end":"16:36","startHours":15.244919256728961,"endHours":16.606485114182053,"quality":"inauspicious"},{"name":"Śubha","start":"16:36","end":"17:58","startHours":16.606485114182053,"endHours":17.968050971635144,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Amṛta","start":"17:58","end":"19:36","startHours":17.968050971635144,"endHours":19.606485114182053,"quality":"auspicious"},{"name":"Kāla","start":"19:36","end":"21:15","startHours":19.606485114182053,"endHours":21.244919256728963,"quality":"inauspicious"},{"name":"Śubha","start":"21:15","end":"22:53","startHours":21.244919256728963,"endHours":22.88335339927587,"quality":"auspicious"},{"name":"Roga","start":"22:53","end":"00:31","startHours":22.88335339927587,"endHours":24.52178754182278,"quality":"inauspicious"},{"name":"Udveg","start":"00:31","end":"02:10","startHours":24.52178754182278,"endHours":26.160221684369688,"quality":"inauspicious"},{"name":"Chala","start":"02:10","end":"03:48","startHours":26.160221684369688,"endHours":27.798655826916598,"quality":"neutral"},{"name":"Labha","start":"03:48","end":"05:26","startHours":27.798655826916598,"endHours":29.437089969463507,"quality":"auspicious"},{"name":"Amṛta","start":"05:26","end":"07:05","startHours":29.437089969463507,"endHours":31.075524112010413,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"07:05","end":"08:05","startHours":7.075524112010415,"endHours":8.075524112010415,"planetary_lord":"Jupiter"},{"name":"Hora 2","start":"08:05","end":"09:05","startHours":8.075524112010415,"endHours":9.075524112010415,"planetary_lord":"Saturn"},{"name":"Hora 3","start":"09:05","end":"10:05","startHours":9.075524112010415,"endHours":10.075524112010415,"planetary_lord":"Moon"},{"name":"Hora 4","start":"10:05","end":"11:05","startHours":10.075524112010415,"endHours":11.075524112010415,"planetary_lord":"Mercury"},{"name":"Hora 5","start":"11:05","end":"12:05","startHours":11.075524112010415,"endHours":12.075524112010415,"planetary_lord":"Venus"},{"name":"Hora 6","start":"12:05","end":"13:05","startHours":12.075524112010415,"endHours":13.075524112010415,"planetary_lord":"Sun"},{"name":"Hora 7","start":"13:05","end":"14:05","startHours":13.075524112010415,"endHours":14.075524112010415,"planetary_lord":"Mars"},{"name":"Hora 8","start":"14:05","end":"15:05","startHours":14.075524112010415,"endHours":15.075524112010415,"planetary_lord":"Jupiter"},{"name":"Hora 9","start":"15:05","end":"16:05","startHours":15.075524112010415,"endHours":16.075524112010413,"planetary_lord":"Saturn"},{"name":"Hora 10","start":"16:05","end":"17:05","startHours":16.075524112010413,"endHours":17.075524112010413,"planetary_lord":"Moon"},{"name":"Hora 11","start":"17:05","end":"18:05","startHours":17.075524112010413,"endHours":18.075524112010413,"planetary_lord":"Mercury"},{"name":"Hora 12","start":"18:05","end":"19:05","startHours":18.075524112010413,"endHours":19.075524112010413,"planetary_lord":"Venus"},{"name":"Hora 13","start":"19:05","end":"20:05","startHours":19.075524112010413,"endHours":20.075524112010413,"planetary_lord":"Sun"},{"name":"Hora 14","start":"20:05","end":"21:05","startHours":20.075524112010413,"endHours":21.075524112010413,"planetary_lord":"Mars"},{"name":"Hora 15","start":"21:05","end":"22:05","startHours":21.075524112010413,"endHours":22.075524112010413,"planetary_lord":"Jupiter"},{"name":"Hora 16","start":"22:05","end":"23:05","startHours":22.075524112010413,"endHours":23.075524112010413,"planetary_lord":"Saturn"},{"name":"Hora 17","start":"23:05","end":"00:05","startHours":23.075524112010413,"endHours":24.075524112010413,"planetary_lord":"Moon"},{"name":"Hora 18","start":"00:05","end":"01:05","startHours":24.075524112010413,"endHours":25.075524112010413,"planetary_lord":"Mercury"},{"name":"Hora 19","start":"01:05","end":"02:05","startHours":25.075524112010413,"endHours":26.075524112010413,"planetary_lord":"Venus"},{"name":"Hora 20","start":"02:05","end":"03:05","startHours":26.075524112010413,"endHours":27.075524112010413,"planetary_lord":"Sun"},{"name":"Hora 21","start":"03:05","end":"04:05","startHours":27.075524112010413,"endHours":28.075524112010413,"planetary_lord":"Mars"},{"name":"Hora 22","start":"04:05","end":"05:05","startHours":28.075524112010413,"endHours":29.075524112010413,"planetary_lord":"Jupiter"},{"name":"Hora 23","start":"05:05","end":"06:05","startHours":29.075524112010413,"endHours":30.075524112010413,"planetary_lord":"Saturn"},{"name":"Hora 24","start":"06:05","end":"07:05","startHours":30.075524112010413,"endHours":31.075524112010413,"planetary_lord":"Moon"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Ārdrā","Punarvasu","Puṣya","Aśleṣā","Maghā","Svātī","Viśākhā","Anurādhā","Jyeṣṭhā","Mūla","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Bharaṇī","Kṛttikā","Rohiṇī","Mṛgaśirā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Citrā","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Mithuna","Karka","Kanyā","Vṛścika","Kumbha","Mīna"],"unfavorable_rashis":["Meṣa","Vṛṣabha","Siṃha","Tulā","Dhanu","Makara"]},"dishaShool":"South (Dakṣiṇa)","chandraVasa":"North-West","rahuVasa":"North-West","anandadiYoga":{"name":"Kāladaṇḍa","quality":"Inauspicious"},"drikRitu":"Śiśira (Winter) (Drik)","vedicRitu":"Hemanta (Pre-winter)","drikAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":-15.613029133630773,"eotMinutes":-14.37765250936663,"ayanamsa":23.575}},"calendars":{"vikram_samvat":2037,"vikram_samvatsara":"Śrīmukha","saka_samvat":1902,"saka_samvatsara":"Raudra","bengali_samvat":1387,"malayalam_era":1156,"nanakshahi_year":511,"lunar_month":"Māgha","lunar_month_paksha_full":"Māgha Kṛṣṇa Pakṣa","solar_month":"Makara (Tai)","ritu":"Śiśira (Winter)","display_summary":"Māgha Kṛṣṇa Ṣaṣṭhī · Vikram 2037 Śrīmukha · Śaka 1902 Raudra"},"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":"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 February 7, 1980 CE · Ṛṣikeśa · Vidhyamitra","description":"February 7, 1980 CE for Ṛṣikeśa: Kṛṣṇa Ṣaṣṭhī, sūryodaya 07:05, sūryāsta 17:58.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/rishikesh/1980-02-07","hreflang_alternates":{"en":"https://vidhyamitra.com/city/rishikesh/1980-02-07","sa":"https://sa.vidhyamitra.com/city/rishikesh/1980-02-07","hi":"https://hi.vidhyamitra.com/city/rishikesh/1980-02-07","x-default":"https://vidhyamitra.com/city/rishikesh/1980-02-07"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-20T18:16:31.400Z","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":"2026-05-20T18:16:31.400Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-20T18:16:31.400Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}