{"id":"vidhyamitra:city-day:chicago:1981-02-20:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/chicago/1981-02-20","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-02-20","date_display":"February 20, 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":20,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444655.770833,"kali_year":5082,"ahargana":1856190.2708,"sun":{"sidereal_longitude":307.8975,"rashi":11,"rashi_name":"Kumbha"},"moon":{"sidereal_longitude":142.6948,"rashi":5,"rashi_name":"Siṃha"},"tithi":{"number":17,"name":"Dvitīyā","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Dvitīyā","elongation_degrees":194.7973,"elapsed_within_tithi_degrees":2.7973},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":3,"moon_longitude":142.6948,"elapsed_within_degrees":9.3615},"yoga":{"number":7,"name":"Sukarma","sum_longitude":90.5924},"karana":{"half_tithi_index":32,"name":"Taitila"},"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":20,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444655.770833,"ahargana":1856190.2708,"kali_year":5082,"ayanamsa_lahiri":23.5895,"grahas":{"sun":{"sidereal_longitude":307.73073,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":1},"retrograde":false},"moon":{"sidereal_longitude":140.27882999999997,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":3},"retrograde":false,"latitude":2.4219},"mars":{"sidereal_longitude":317.0408299999999,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":302.55563000000006,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":3},"retrograde":true},"jupiter":{"sidereal_longitude":165.78993000000003,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":true},"venus":{"sidereal_longitude":296.45453,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":1},"retrograde":false},"saturn":{"sidereal_longitude":165.07663000000002,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":true},"rahu":{"sidereal_longitude":110.1068,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":290.1068,"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":20,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444655.770833,"kali_year":5082,"ahargana":1856190.2708,"sun":{"sidereal_longitude":307.8975,"rashi":11,"rashi_name":"Kumbha"},"moon":{"sidereal_longitude":142.6948,"rashi":5,"rashi_name":"Siṃha"},"tithi":{"number":17,"name":"Dvitīyā","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Dvitīyā","elongation_degrees":194.7973,"elapsed_within_tithi_degrees":2.7973},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":3,"moon_longitude":142.6948,"elapsed_within_degrees":9.3615},"yoga":{"number":7,"name":"Sukarma","sum_longitude":90.5924},"karana":{"half_tithi_index":32,"name":"Taitila"},"vara":{"number":0,"name":"Śukravāra (Friday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":2.422,"elongation":165.203},"lunar":{"type":"lunar","occurs":false,"moon_latitude":2.422,"opposition_distance":14.797}},"eclipse_window_40days":[{"offset_days":-15,"type":"solar","occurs":true,"moon_latitude":-0.15,"elongation":0.162}]},"city":{"slug":"chicago","name":"Chicago, USA","lat":41.8781,"lon":-87.6298,"tz_offset_hours":-6,"country":"US","tier":"diaspora"},"tier2":{"city":{"slug":"chicago","name":"Chicago, USA","lat":41.8781,"lon":-87.6298,"tz_offset_hours":-6,"country":"US","tier":"diaspora"},"sunriseLocal":"06:40","sunsetLocal":"17:29","solarNoonLocal":"12:05","dayLengthHours":10.815371023219283,"dayLengthDisplay":"10 Hours 48 Mins 55 Secs","nightLengthDisplay":"13 Hours 11 Mins 05 Secs","moonriseLocal":"18:29","moonsetLocal":"07:21","rahuKala":{"name":"Rāhu Kāla","start":"10:44","end":"12:05","startHours":10.728121039509627,"endHours":12.080042417412038,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"14:47","end":"16:08","startHours":14.78388517321686,"endHours":16.13580655111927,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"08:01","end":"09:23","startHours":8.024278283704808,"endHours":9.376199661607219,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:12","end":"09:33","startHours":9.195943477886896,"endHours":9.55645584532754,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:07","end":"07:25","startHours":7.122997365103201,"endHours":7.411407259055715,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:43","end":"12:26","startHours":11.719530049971395,"endHours":12.440554784852681,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:14","end":"05:57","startHours":5.230307436039826,"endHours":5.951332170921112,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:46","end":"06:40","startHours":5.77107598720079,"endHours":6.672356905802397,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"13:53","end":"14:36","startHours":13.882604254615252,"endHours":14.603628989496539,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:17","end":"17:41","startHours":17.28772792902168,"endHours":17.68772792902168,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:29","end":"17:56","startHours":17.48772792902168,"endHours":17.938368388322484,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:14","end":"18:59","startHours":17.23772792902168,"endHours":18.98772792902168,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:43","end":"00:26","startHours":23.719530049971397,"endHours":24.44055478485268,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Chala","start":"06:40","end":"08:01","startHours":6.672356905802397,"endHours":8.024278283704808,"quality":"neutral"},{"name":"Labha","start":"08:01","end":"09:23","startHours":8.024278283704808,"endHours":9.376199661607219,"quality":"auspicious"},{"name":"Amṛta","start":"09:23","end":"10:44","startHours":9.376199661607219,"endHours":10.728121039509627,"quality":"auspicious"},{"name":"Kāla","start":"10:44","end":"12:05","startHours":10.728121039509627,"endHours":12.080042417412038,"quality":"inauspicious"},{"name":"Śubha","start":"12:05","end":"13:26","startHours":12.080042417412038,"endHours":13.431963795314449,"quality":"auspicious"},{"name":"Roga","start":"13:26","end":"14:47","startHours":13.431963795314449,"endHours":14.78388517321686,"quality":"inauspicious"},{"name":"Udveg","start":"14:47","end":"16:08","startHours":14.78388517321686,"endHours":16.13580655111927,"quality":"inauspicious"},{"name":"Chala","start":"16:08","end":"17:29","startHours":16.13580655111927,"endHours":17.48772792902168,"quality":"neutral"}],"nightChoghadiyas":[{"name":"Roga","start":"17:29","end":"19:08","startHours":17.48772792902168,"endHours":19.13580655111927,"quality":"inauspicious"},{"name":"Udveg","start":"19:08","end":"20:47","startHours":19.13580655111927,"endHours":20.78388517321686,"quality":"inauspicious"},{"name":"Chala","start":"20:47","end":"22:26","startHours":20.78388517321686,"endHours":22.43196379531445,"quality":"neutral"},{"name":"Labha","start":"22:26","end":"00:05","startHours":22.43196379531445,"endHours":24.080042417412038,"quality":"auspicious"},{"name":"Amṛta","start":"00:05","end":"01:44","startHours":24.080042417412038,"endHours":25.72812103950963,"quality":"auspicious"},{"name":"Kāla","start":"01:44","end":"03:23","startHours":25.72812103950963,"endHours":27.376199661607217,"quality":"inauspicious"},{"name":"Śubha","start":"03:23","end":"05:01","startHours":27.376199661607217,"endHours":29.02427828370481,"quality":"auspicious"},{"name":"Roga","start":"05:01","end":"06:40","startHours":29.02427828370481,"endHours":30.672356905802395,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"06:40","end":"07:40","startHours":6.672356905802397,"endHours":7.672356905802397,"planetary_lord":"Venus"},{"name":"Hora 2","start":"07:40","end":"08:40","startHours":7.672356905802397,"endHours":8.672356905802397,"planetary_lord":"Sun"},{"name":"Hora 3","start":"08:40","end":"09:40","startHours":8.672356905802397,"endHours":9.672356905802397,"planetary_lord":"Mars"},{"name":"Hora 4","start":"09:40","end":"10:40","startHours":9.672356905802397,"endHours":10.672356905802397,"planetary_lord":"Jupiter"},{"name":"Hora 5","start":"10:40","end":"11:40","startHours":10.672356905802397,"endHours":11.672356905802397,"planetary_lord":"Saturn"},{"name":"Hora 6","start":"11:40","end":"12:40","startHours":11.672356905802397,"endHours":12.672356905802397,"planetary_lord":"Moon"},{"name":"Hora 7","start":"12:40","end":"13:40","startHours":12.672356905802397,"endHours":13.672356905802397,"planetary_lord":"Mercury"},{"name":"Hora 8","start":"13:40","end":"14:40","startHours":13.672356905802397,"endHours":14.672356905802397,"planetary_lord":"Venus"},{"name":"Hora 9","start":"14:40","end":"15:40","startHours":14.672356905802397,"endHours":15.672356905802397,"planetary_lord":"Sun"},{"name":"Hora 10","start":"15:40","end":"16:40","startHours":15.672356905802397,"endHours":16.672356905802395,"planetary_lord":"Mars"},{"name":"Hora 11","start":"16:40","end":"17:40","startHours":16.672356905802395,"endHours":17.672356905802395,"planetary_lord":"Jupiter"},{"name":"Hora 12","start":"17:40","end":"18:40","startHours":17.672356905802395,"endHours":18.672356905802395,"planetary_lord":"Saturn"},{"name":"Hora 13","start":"18:40","end":"19:40","startHours":18.672356905802395,"endHours":19.672356905802395,"planetary_lord":"Moon"},{"name":"Hora 14","start":"19:40","end":"20:40","startHours":19.672356905802395,"endHours":20.672356905802395,"planetary_lord":"Mercury"},{"name":"Hora 15","start":"20:40","end":"21:40","startHours":20.672356905802395,"endHours":21.672356905802395,"planetary_lord":"Venus"},{"name":"Hora 16","start":"21:40","end":"22:40","startHours":21.672356905802395,"endHours":22.672356905802395,"planetary_lord":"Sun"},{"name":"Hora 17","start":"22:40","end":"23:40","startHours":22.672356905802395,"endHours":23.672356905802395,"planetary_lord":"Mars"},{"name":"Hora 18","start":"23:40","end":"00:40","startHours":23.672356905802395,"endHours":24.672356905802395,"planetary_lord":"Jupiter"},{"name":"Hora 19","start":"00:40","end":"01:40","startHours":24.672356905802395,"endHours":25.672356905802395,"planetary_lord":"Saturn"},{"name":"Hora 20","start":"01:40","end":"02:40","startHours":25.672356905802395,"endHours":26.672356905802395,"planetary_lord":"Moon"},{"name":"Hora 21","start":"02:40","end":"03:40","startHours":26.672356905802395,"endHours":27.672356905802395,"planetary_lord":"Mercury"},{"name":"Hora 22","start":"03:40","end":"04:40","startHours":27.672356905802395,"endHours":28.672356905802395,"planetary_lord":"Venus"},{"name":"Hora 23","start":"04:40","end":"05:40","startHours":28.672356905802395,"endHours":29.672356905802395,"planetary_lord":"Sun"},{"name":"Hora 24","start":"05:40","end":"06:40","startHours":29.672356905802395,"endHours":30.672356905802395,"planetary_lord":"Mars"}],"taraBala":{"favorable_nakshatras":["Kṛttikā","Rohiṇī","Mṛgaśirā","Ārdrā","Punarvasu","Uttara Phalgunī","Hasta","Citrā","Svātī","Viśākhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā"],"unfavorable_nakshatras":["Aśvinī","Bharaṇī","Puṣya","Aśleṣā","Maghā","Pūrva Phalgunī","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Bhādrapadā","Revatī"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Vṛṣabha","Mithuna","Siṃha","Tulā","Makara","Kumbha"],"unfavorable_rashis":["Meṣa","Karka","Kanyā","Vṛścika","Dhanu","Mīna"]},"dishaShool":"West (Paścim)","chandraVasa":"West","rahuVasa":"South-East","anandadiYoga":{"name":"Dhūmra","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":-11.00398583657169,"eotMinutes":-14.28334504472219,"ayanamsa":23.5895}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Phālguna","lunar_month_paksha_full":"Phālguna Kṛṣṇa Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Phālguna","lunar_month_amanta":"Māgha","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Kumbha (Māsi)","ritu":"Śiśira (Winter)","display_summary":"Phālguna Kṛṣṇa 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":"chicago"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga February 20, 1981 CE · Chicago, USA · Vidhyamitra","description":"February 20, 1981 CE for Chicago, USA: Kṛṣṇa Dvitīyā, sūryodaya 06:40, sūryāsta 17:29.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/chicago/1981-02-20","hreflang_alternates":{"en":"https://vidhyamitra.com/city/chicago/1981-02-20","sa":"https://sa.vidhyamitra.com/city/chicago/1981-02-20","hi":"https://hi.vidhyamitra.com/city/chicago/1981-02-20","x-default":"https://vidhyamitra.com/city/chicago/1981-02-20"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-02T11:13:14.251Z","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":"2026-06-02T11:13:14.251Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-02T11:13:14.251Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}