{"id":"vidhyamitra:city-day:boston:1981-02-06:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/boston/1981-02-06","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-02-06","date_display":"February 6, 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":2,"day":6,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444641.770833,"kali_year":5082,"ahargana":1856176.2708,"sun":{"sidereal_longitude":293.6755,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":306.5812,"rashi":11,"rashi_name":"Kumbha"},"tithi":{"number":2,"name":"Dvitīyā","paksha":"Śukla","full_name":"Śukla Dvitīyā","elongation_degrees":12.9057,"elapsed_within_tithi_degrees":0.9057},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":4,"moon_longitude":306.5812,"elapsed_within_degrees":13.2479},"yoga":{"number":19,"name":"Parigha","sum_longitude":240.2567},"karana":{"half_tithi_index":2,"name":"Bālava"},"vara":{"number":0,"name":"Śukravāra (Friday)"}},"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":2,"day":6,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444641.770833,"ahargana":1856176.2708,"kali_year":5082,"ayanamsa_lahiri":23.589,"grahas":{"sun":{"sidereal_longitude":293.580464,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":1},"retrograde":false},"moon":{"sidereal_longitude":307.932764,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":1},"retrograde":false,"latitude":-1.219},"mars":{"sidereal_longitude":305.99146399999995,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":311.09426400000007,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":2},"retrograde":false},"jupiter":{"sidereal_longitude":166.61786400000005,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":true},"venus":{"sidereal_longitude":278.93306400000006,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":4},"retrograde":false},"saturn":{"sidereal_longitude":165.67296399999998,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":true},"rahu":{"sidereal_longitude":110.8486,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":290.8486,"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":2,"day":6,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444641.770833,"kali_year":5082,"ahargana":1856176.2708,"sun":{"sidereal_longitude":293.6755,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":306.5812,"rashi":11,"rashi_name":"Kumbha"},"tithi":{"number":2,"name":"Dvitīyā","paksha":"Śukla","full_name":"Śukla Dvitīyā","elongation_degrees":12.9057,"elapsed_within_tithi_degrees":0.9057},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":4,"moon_longitude":306.5812,"elapsed_within_degrees":13.2479},"yoga":{"number":19,"name":"Parigha","sum_longitude":240.2567},"karana":{"half_tithi_index":2,"name":"Bālava"},"vara":{"number":0,"name":"Śukravāra (Friday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-1.219,"elongation":12.906},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-1.219,"opposition_distance":167.094}},"eclipse_window_40days":[{"offset_days":-17,"type":"lunar","occurs":true,"moon_latitude":-1.332,"opposition_distance":1.776},{"offset_days":-1,"type":"solar","occurs":true,"moon_latitude":-0.15,"elongation":0.162}]},"city":{"slug":"boston","name":"Boston, USA","lat":42.3601,"lon":-71.0589,"tz_offset_hours":-5,"country":"US","tier":"diaspora"},"tier2":{"city":{"slug":"boston","name":"Boston, USA","lat":42.3601,"lon":-71.0589,"tz_offset_hours":-5,"country":"US","tier":"diaspora"},"sunriseLocal":"06:53","sunsetLocal":"17:04","solarNoonLocal":"11:59","dayLengthHours":10.182598096623215,"dayLengthDisplay":"10 Hours 10 Mins 57 Secs","nightLengthDisplay":"13 Hours 49 Mins 03 Secs","moonriseLocal":"07:33","moonsetLocal":"18:19","rahuKala":{"name":"Rāhu Kāla","start":"10:42","end":"11:59","startHours":10.70269078988005,"endHours":11.975515551957951,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"14:31","end":"15:48","startHours":14.521165076113755,"endHours":15.793989838191658,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"08:09","end":"09:26","startHours":8.157041265724246,"endHours":9.429866027802149,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:16","end":"09:36","startHours":9.260156059525094,"endHours":9.599575996079203,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:19","end":"07:35","startHours":7.308491424338978,"endHours":7.580027373582264,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:38","end":"12:19","startHours":11.636095615403844,"endHours":12.314935488512058,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:32","end":"06:12","startHours":5.526536757429916,"endHours":6.20537663053813,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"06:02","end":"06:53","startHours":6.035666662261077,"endHours":6.8842165036463445,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"13:40","end":"14:21","startHours":13.672615234728488,"endHours":14.351455107836703,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"16:52","end":"17:16","startHours":16.86681460026956,"endHours":17.26681460026956,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:04","end":"17:29","startHours":17.06681460026956,"endHours":17.491089520962195,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"16:49","end":"18:34","startHours":16.81681460026956,"endHours":18.56681460026956,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:38","end":"00:19","startHours":23.636095615403843,"endHours":24.31493548851206,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Chala","start":"06:53","end":"08:09","startHours":6.8842165036463445,"endHours":8.157041265724246,"quality":"neutral"},{"name":"Labha","start":"08:09","end":"09:26","startHours":8.157041265724246,"endHours":9.429866027802149,"quality":"auspicious"},{"name":"Amṛta","start":"09:26","end":"10:42","startHours":9.429866027802149,"endHours":10.70269078988005,"quality":"auspicious"},{"name":"Kāla","start":"10:42","end":"11:59","startHours":10.70269078988005,"endHours":11.975515551957951,"quality":"inauspicious"},{"name":"Śubha","start":"11:59","end":"13:15","startHours":11.975515551957951,"endHours":13.248340314035854,"quality":"auspicious"},{"name":"Roga","start":"13:15","end":"14:31","startHours":13.248340314035854,"endHours":14.521165076113755,"quality":"inauspicious"},{"name":"Udveg","start":"14:31","end":"15:48","startHours":14.521165076113755,"endHours":15.793989838191658,"quality":"inauspicious"},{"name":"Chala","start":"15:48","end":"17:04","startHours":15.793989838191658,"endHours":17.06681460026956,"quality":"neutral"}],"nightChoghadiyas":[{"name":"Roga","start":"17:04","end":"18:48","startHours":17.06681460026956,"endHours":18.793989838191656,"quality":"inauspicious"},{"name":"Udveg","start":"18:48","end":"20:31","startHours":18.793989838191656,"endHours":20.521165076113757,"quality":"inauspicious"},{"name":"Chala","start":"20:31","end":"22:15","startHours":20.521165076113757,"endHours":22.248340314035854,"quality":"neutral"},{"name":"Labha","start":"22:15","end":"23:59","startHours":22.248340314035854,"endHours":23.97551555195795,"quality":"auspicious"},{"name":"Amṛta","start":"23:59","end":"01:42","startHours":23.97551555195795,"endHours":25.70269078988005,"quality":"auspicious"},{"name":"Kāla","start":"01:42","end":"03:26","startHours":25.70269078988005,"endHours":27.42986602780215,"quality":"inauspicious"},{"name":"Śubha","start":"03:26","end":"05:09","startHours":27.42986602780215,"endHours":29.157041265724246,"quality":"auspicious"},{"name":"Roga","start":"05:09","end":"06:53","startHours":29.157041265724246,"endHours":30.884216503646343,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"06:53","end":"07:53","startHours":6.8842165036463445,"endHours":7.8842165036463445,"planetary_lord":"Venus"},{"name":"Hora 2","start":"07:53","end":"08:53","startHours":7.8842165036463445,"endHours":8.884216503646345,"planetary_lord":"Sun"},{"name":"Hora 3","start":"08:53","end":"09:53","startHours":8.884216503646345,"endHours":9.884216503646345,"planetary_lord":"Mars"},{"name":"Hora 4","start":"09:53","end":"10:53","startHours":9.884216503646345,"endHours":10.884216503646345,"planetary_lord":"Jupiter"},{"name":"Hora 5","start":"10:53","end":"11:53","startHours":10.884216503646345,"endHours":11.884216503646345,"planetary_lord":"Saturn"},{"name":"Hora 6","start":"11:53","end":"12:53","startHours":11.884216503646345,"endHours":12.884216503646345,"planetary_lord":"Moon"},{"name":"Hora 7","start":"12:53","end":"13:53","startHours":12.884216503646345,"endHours":13.884216503646345,"planetary_lord":"Mercury"},{"name":"Hora 8","start":"13:53","end":"14:53","startHours":13.884216503646345,"endHours":14.884216503646345,"planetary_lord":"Venus"},{"name":"Hora 9","start":"14:53","end":"15:53","startHours":14.884216503646345,"endHours":15.884216503646345,"planetary_lord":"Sun"},{"name":"Hora 10","start":"15:53","end":"16:53","startHours":15.884216503646345,"endHours":16.884216503646343,"planetary_lord":"Mars"},{"name":"Hora 11","start":"16:53","end":"17:53","startHours":16.884216503646343,"endHours":17.884216503646343,"planetary_lord":"Jupiter"},{"name":"Hora 12","start":"17:53","end":"18:53","startHours":17.884216503646343,"endHours":18.884216503646343,"planetary_lord":"Saturn"},{"name":"Hora 13","start":"18:53","end":"19:53","startHours":18.884216503646343,"endHours":19.884216503646343,"planetary_lord":"Moon"},{"name":"Hora 14","start":"19:53","end":"20:53","startHours":19.884216503646343,"endHours":20.884216503646343,"planetary_lord":"Mercury"},{"name":"Hora 15","start":"20:53","end":"21:53","startHours":20.884216503646343,"endHours":21.884216503646343,"planetary_lord":"Venus"},{"name":"Hora 16","start":"21:53","end":"22:53","startHours":21.884216503646343,"endHours":22.884216503646343,"planetary_lord":"Sun"},{"name":"Hora 17","start":"22:53","end":"23:53","startHours":22.884216503646343,"endHours":23.884216503646343,"planetary_lord":"Mars"},{"name":"Hora 18","start":"23:53","end":"00:53","startHours":23.884216503646343,"endHours":24.884216503646343,"planetary_lord":"Jupiter"},{"name":"Hora 19","start":"00:53","end":"01:53","startHours":24.884216503646343,"endHours":25.884216503646343,"planetary_lord":"Saturn"},{"name":"Hora 20","start":"01:53","end":"02:53","startHours":25.884216503646343,"endHours":26.884216503646343,"planetary_lord":"Moon"},{"name":"Hora 21","start":"02:53","end":"03:53","startHours":26.884216503646343,"endHours":27.884216503646343,"planetary_lord":"Mercury"},{"name":"Hora 22","start":"03:53","end":"04:53","startHours":27.884216503646343,"endHours":28.884216503646343,"planetary_lord":"Venus"},{"name":"Hora 23","start":"04:53","end":"05:53","startHours":28.884216503646343,"endHours":29.884216503646343,"planetary_lord":"Sun"},{"name":"Hora 24","start":"05:53","end":"06:53","startHours":29.884216503646343,"endHours":30.884216503646343,"planetary_lord":"Mars"}],"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":["Meṣa","Karka","Siṃha","Vṛścika","Dhanu","Kumbha"],"unfavorable_rashis":["Vṛṣabha","Mithuna","Kanyā","Tulā","Makara","Mīna"]},"dishaShool":"West (Paścim)","chandraVasa":"South","rahuVasa":"South-East","anandadiYoga":{"name":"Lumba","quality":"Auspicious"},"tropicalRitu":"Śiśira (Winter) (tropical)","vedicRitu":"Hemanta (Pre-winter)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-15.68755605604244,"eotMinutes":-14.295333117477217,"ayanamsa":23.589}},"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","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Māgha","lunar_month_amanta":"Māgha","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Makara (Tai)","ritu":"Śiśira (Winter)","display_summary":"Māgha Śukla Dvitīyā · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[],"todays_walk":{"walk":{"id":"shukra-walk","name":"Śukra Walk","name_sanskrit":"शुक्र यात्रा","type":"graha","description":"Beauty + creativity in dharma + BG 10.36.","step_count":5,"url":"/walk/shukra-walk"},"reason":"Śukravāra (Friday) — its presiding graha's walk."},"cosmic_resonances":[]},"validity":{"eternal":false,"location_specific":"boston"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga February 6, 1981 CE · Boston, USA · Vidhyamitra","description":"February 6, 1981 CE for Boston, USA: Śukla Dvitīyā, sūryodaya 06:53, sūryāsta 17:04.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/boston/1981-02-06","hreflang_alternates":{"en":"https://vidhyamitra.com/city/boston/1981-02-06","sa":"https://sa.vidhyamitra.com/city/boston/1981-02-06","hi":"https://hi.vidhyamitra.com/city/boston/1981-02-06","x-default":"https://vidhyamitra.com/city/boston/1981-02-06"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-03T07:34:57.045Z","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":"2026-06-03T07:34:57.045Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-03T07:34:57.045Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}