{"id":"vidhyamitra:city-day:chicago:1981-02-03:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/chicago/1981-02-03","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-02-03","date_display":"February 3, 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":3,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444638.770833,"kali_year":5082,"ahargana":1856173.2708,"sun":{"sidereal_longitude":290.6152,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":266.2179,"rashi":9,"rashi_name":"Dhanu"},"tithi":{"number":28,"name":"Trayodaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Trayodaśī","elongation_degrees":335.6028,"elapsed_within_tithi_degrees":11.6028},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":4,"moon_longitude":266.2179,"elapsed_within_degrees":12.8846},"yoga":{"number":15,"name":"Vajra","sum_longitude":196.8331},"karana":{"half_tithi_index":55,"name":"Vaṇija"},"vara":{"number":4,"name":"Maṅgalavāra (Tuesday)"}},"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":3,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444638.770833,"ahargana":1856173.2708,"kali_year":5082,"ayanamsa_lahiri":23.5889,"grahas":{"sun":{"sidereal_longitude":290.538679,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":4},"retrograde":false},"moon":{"sidereal_longitude":267.055879,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":1},"retrograde":false,"latitude":1.8852},"mars":{"sidereal_longitude":303.620579,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":309.07697899999994,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":1},"retrograde":false},"jupiter":{"sidereal_longitude":166.71907899999997,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":3},"retrograde":true},"venus":{"sidereal_longitude":275.176279,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":165.76047900000003,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":true},"rahu":{"sidereal_longitude":111.0076,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":291.0076,"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":3,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444638.770833,"kali_year":5082,"ahargana":1856173.2708,"sun":{"sidereal_longitude":290.6152,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":266.2179,"rashi":9,"rashi_name":"Dhanu"},"tithi":{"number":28,"name":"Trayodaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Trayodaśī","elongation_degrees":335.6028,"elapsed_within_tithi_degrees":11.6028},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":4,"moon_longitude":266.2179,"elapsed_within_degrees":12.8846},"yoga":{"number":15,"name":"Vajra","sum_longitude":196.8331},"karana":{"half_tithi_index":55,"name":"Vaṇija"},"vara":{"number":4,"name":"Maṅgalavāra (Tuesday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":1.885,"elongation":24.397},"lunar":{"type":"lunar","occurs":false,"moon_latitude":1.885,"opposition_distance":155.603}},"eclipse_window_40days":[{"offset_days":-14,"type":"lunar","occurs":true,"moon_latitude":-1.332,"opposition_distance":1.776},{"offset_days":2,"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":"07:02","sunsetLocal":"17:07","solarNoonLocal":"12:04","dayLengthHours":10.095697032274856,"dayLengthDisplay":"10 Hours 05 Mins 45 Secs","nightLengthDisplay":"13 Hours 54 Mins 15 Secs","moonriseLocal":"05:51","moonsetLocal":"15:10","rahuKala":{"name":"Rāhu Kāla","start":"14:36","end":"15:52","startHours":14.598752297216215,"endHours":15.86071442625057,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"09:33","end":"10:49","startHours":9.550903781078787,"endHours":10.812865910113143,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"12:04","end":"13:20","startHours":12.074828039147501,"endHours":13.336790168181857,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:23","end":"09:43","startHours":9.382642163874205,"endHours":9.719165398283367,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:27","end":"07:43","startHours":7.4476335660215245,"endHours":7.716852153548854,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:44","end":"12:25","startHours":11.73830480473834,"endHours":12.411351273556663,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:41","end":"06:21","startHours":5.680886585373425,"endHours":6.3539330541917485,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"06:11","end":"07:02","startHours":6.1856714369871675,"endHours":7.0269795230100724,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"13:45","end":"14:26","startHours":13.75744421119331,"endHours":14.430490680011633,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"16:55","end":"17:19","startHours":16.92267655528493,"endHours":17.32267655528493,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:07","end":"17:33","startHours":17.12267655528493,"endHours":17.543330598296382,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"16:52","end":"18:37","startHours":16.87267655528493,"endHours":18.62267655528493,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:44","end":"00:25","startHours":23.73830480473834,"endHours":24.41135127355666,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Roga","start":"07:02","end":"08:17","startHours":7.0269795230100724,"endHours":8.288941652044429,"quality":"inauspicious"},{"name":"Udveg","start":"08:17","end":"09:33","startHours":8.288941652044429,"endHours":9.550903781078787,"quality":"inauspicious"},{"name":"Chala","start":"09:33","end":"10:49","startHours":9.550903781078787,"endHours":10.812865910113143,"quality":"neutral"},{"name":"Labha","start":"10:49","end":"12:04","startHours":10.812865910113143,"endHours":12.074828039147501,"quality":"auspicious"},{"name":"Amṛta","start":"12:04","end":"13:20","startHours":12.074828039147501,"endHours":13.336790168181857,"quality":"auspicious"},{"name":"Kāla","start":"13:20","end":"14:36","startHours":13.336790168181857,"endHours":14.598752297216215,"quality":"inauspicious"},{"name":"Śubha","start":"14:36","end":"15:52","startHours":14.598752297216215,"endHours":15.86071442625057,"quality":"auspicious"},{"name":"Roga","start":"15:52","end":"17:07","startHours":15.86071442625057,"endHours":17.12267655528493,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Kāla","start":"17:07","end":"18:52","startHours":17.12267655528493,"endHours":18.860714426250574,"quality":"inauspicious"},{"name":"Śubha","start":"18:52","end":"20:36","startHours":18.860714426250574,"endHours":20.598752297216215,"quality":"auspicious"},{"name":"Roga","start":"20:36","end":"22:20","startHours":20.598752297216215,"endHours":22.336790168181857,"quality":"inauspicious"},{"name":"Udveg","start":"22:20","end":"00:04","startHours":22.336790168181857,"endHours":24.0748280391475,"quality":"inauspicious"},{"name":"Chala","start":"00:04","end":"01:49","startHours":24.0748280391475,"endHours":25.812865910113146,"quality":"neutral"},{"name":"Labha","start":"01:49","end":"03:33","startHours":25.812865910113146,"endHours":27.550903781078787,"quality":"auspicious"},{"name":"Amṛta","start":"03:33","end":"05:17","startHours":27.550903781078787,"endHours":29.28894165204443,"quality":"auspicious"},{"name":"Kāla","start":"05:17","end":"07:02","startHours":29.28894165204443,"endHours":31.026979523010073,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"07:02","end":"08:02","startHours":7.0269795230100724,"endHours":8.026979523010073,"planetary_lord":"Mars"},{"name":"Hora 2","start":"08:02","end":"09:02","startHours":8.026979523010073,"endHours":9.026979523010073,"planetary_lord":"Jupiter"},{"name":"Hora 3","start":"09:02","end":"10:02","startHours":9.026979523010073,"endHours":10.026979523010073,"planetary_lord":"Saturn"},{"name":"Hora 4","start":"10:02","end":"11:02","startHours":10.026979523010073,"endHours":11.026979523010073,"planetary_lord":"Moon"},{"name":"Hora 5","start":"11:02","end":"12:02","startHours":11.026979523010073,"endHours":12.026979523010073,"planetary_lord":"Mercury"},{"name":"Hora 6","start":"12:02","end":"13:02","startHours":12.026979523010073,"endHours":13.026979523010073,"planetary_lord":"Venus"},{"name":"Hora 7","start":"13:02","end":"14:02","startHours":13.026979523010073,"endHours":14.026979523010073,"planetary_lord":"Sun"},{"name":"Hora 8","start":"14:02","end":"15:02","startHours":14.026979523010073,"endHours":15.026979523010073,"planetary_lord":"Mars"},{"name":"Hora 9","start":"15:02","end":"16:02","startHours":15.026979523010073,"endHours":16.026979523010073,"planetary_lord":"Jupiter"},{"name":"Hora 10","start":"16:02","end":"17:02","startHours":16.026979523010073,"endHours":17.026979523010073,"planetary_lord":"Saturn"},{"name":"Hora 11","start":"17:02","end":"18:02","startHours":17.026979523010073,"endHours":18.026979523010073,"planetary_lord":"Moon"},{"name":"Hora 12","start":"18:02","end":"19:02","startHours":18.026979523010073,"endHours":19.026979523010073,"planetary_lord":"Mercury"},{"name":"Hora 13","start":"19:02","end":"20:02","startHours":19.026979523010073,"endHours":20.026979523010073,"planetary_lord":"Venus"},{"name":"Hora 14","start":"20:02","end":"21:02","startHours":20.026979523010073,"endHours":21.026979523010073,"planetary_lord":"Sun"},{"name":"Hora 15","start":"21:02","end":"22:02","startHours":21.026979523010073,"endHours":22.026979523010073,"planetary_lord":"Mars"},{"name":"Hora 16","start":"22:02","end":"23:02","startHours":22.026979523010073,"endHours":23.026979523010073,"planetary_lord":"Jupiter"},{"name":"Hora 17","start":"23:02","end":"00:02","startHours":23.026979523010073,"endHours":24.026979523010073,"planetary_lord":"Saturn"},{"name":"Hora 18","start":"00:02","end":"01:02","startHours":24.026979523010073,"endHours":25.026979523010073,"planetary_lord":"Moon"},{"name":"Hora 19","start":"01:02","end":"02:02","startHours":25.026979523010073,"endHours":26.026979523010073,"planetary_lord":"Mercury"},{"name":"Hora 20","start":"02:02","end":"03:02","startHours":26.026979523010073,"endHours":27.026979523010073,"planetary_lord":"Venus"},{"name":"Hora 21","start":"03:02","end":"04:02","startHours":27.026979523010073,"endHours":28.026979523010073,"planetary_lord":"Sun"},{"name":"Hora 22","start":"04:02","end":"05:02","startHours":28.026979523010073,"endHours":29.026979523010073,"planetary_lord":"Mars"},{"name":"Hora 23","start":"05:02","end":"06:02","startHours":29.026979523010073,"endHours":30.026979523010073,"planetary_lord":"Jupiter"},{"name":"Hora 24","start":"06:02","end":"07:02","startHours":30.026979523010073,"endHours":31.026979523010073,"planetary_lord":"Saturn"}],"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","Kanyā","Tulā","Dhanu","Kumbha"],"unfavorable_rashis":["Meṣa","Karka","Siṃha","Vṛścika","Makara","Mīna"]},"dishaShool":"North (Uttara)","chandraVasa":"East","rahuVasa":"North","anandadiYoga":{"name":"Dhātṛ","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":-16.588073313673473,"eotMinutes":-13.970482348849993,"ayanamsa":23.5889}},"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 Kṛṣṇa Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Māgha","lunar_month_amanta":"Pauṣa","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 Kṛṣṇa Trayodaśī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"pradosha-vrata","name":"Pradoṣa Vrata","name_sanskrit":"प्रदोष व्रत","tradition":"Shaiva","associated_deity":"Śiva","significance":"Twilight worship of Śiva on Trayodaśī.","vrata":true,"detection":{"any_of":[{"tithi_number":13},{"tithi_number":28}]},"precedence":7}],"todays_walk":{"walk":{"id":"mangala-walk","name":"Maṅgala Walk","name_sanskrit":"मङ्गल यात्रा","type":"graha","description":"Right action + BG 2.31-38 (kṣatriya-dharma).","step_count":7,"url":"/walk/mangala-walk"},"reason":"Maṅgalavāra (Tuesday) — 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 3, 1981 CE · Chicago, USA · Vidhyamitra","description":"February 3, 1981 CE for Chicago, USA: Kṛṣṇa Trayodaśī, sūryodaya 07:02, sūryāsta 17:07.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/chicago/1981-02-03","hreflang_alternates":{"en":"https://vidhyamitra.com/city/chicago/1981-02-03","sa":"https://sa.vidhyamitra.com/city/chicago/1981-02-03","hi":"https://hi.vidhyamitra.com/city/chicago/1981-02-03","x-default":"https://vidhyamitra.com/city/chicago/1981-02-03"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-02T09:29:43.910Z","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":"2026-06-02T09:29:43.910Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-02T09:29:43.910Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}