{"id":"vidhyamitra:city-day:chicago:1981-04-05:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/chicago/1981-04-05","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-04-05","date_display":"April 5, 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":4,"day":5,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444699.770833,"kali_year":5082,"ahargana":1856234.2708,"sun":{"sidereal_longitude":351.7866,"rashi":12,"rashi_name":"Mīna"},"moon":{"sidereal_longitude":353.4024,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":1,"name":"Pratipada","paksha":"Śukla","full_name":"Śukla Pratipada","elongation_degrees":1.6158,"elapsed_within_tithi_degrees":1.6158},"nakshatra":{"number":27,"name":"Revatī","pada":3,"moon_longitude":353.4024,"elapsed_within_degrees":6.7357},"yoga":{"number":26,"name":"Indra","sum_longitude":345.189},"karana":{"half_tithi_index":0,"name":"Kiṃstughna"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"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":4,"day":5,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444699.770833,"ahargana":1856234.2708,"kali_year":5082,"ayanamsa_lahiri":23.5912,"grahas":{"sun":{"sidereal_longitude":351.584848,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":2},"retrograde":false},"moon":{"sidereal_longitude":354.436548,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":3},"retrograde":false,"latitude":-4.0982},"mars":{"sidereal_longitude":351.292948,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":2},"retrograde":false},"mercury":{"sidereal_longitude":331.1086479999999,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":160.747748,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":1},"retrograde":true},"venus":{"sidereal_longitude":351.269748,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":161.94334800000001,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":107.7755,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":287.7755,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":3},"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":4,"day":5,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444699.770833,"kali_year":5082,"ahargana":1856234.2708,"sun":{"sidereal_longitude":351.7866,"rashi":12,"rashi_name":"Mīna"},"moon":{"sidereal_longitude":353.4024,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":1,"name":"Pratipada","paksha":"Śukla","full_name":"Śukla Pratipada","elongation_degrees":1.6158,"elapsed_within_tithi_degrees":1.6158},"nakshatra":{"number":27,"name":"Revatī","pada":3,"moon_longitude":353.4024,"elapsed_within_degrees":6.7357},"yoga":{"number":26,"name":"Indra","sum_longitude":345.189},"karana":{"half_tithi_index":0,"name":"Kiṃstughna"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-4.098,"elongation":1.616},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-4.098,"opposition_distance":178.384}},"eclipse_window_40days":[]},"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":"05:28","sunsetLocal":"18:20","solarNoonLocal":"11:54","dayLengthHours":12.86889301338334,"dayLengthDisplay":"12 Hours 52 Mins 08 Secs","nightLengthDisplay":"11 Hours 07 Mins 52 Secs","moonriseLocal":"05:36","moonsetLocal":"18:34","rahuKala":{"name":"Rāhu Kāla","start":"16:43","end":"18:20","startHours":16.71940740278336,"endHours":18.32801902945628,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"11:54","end":"13:30","startHours":11.893572522764607,"endHours":13.502184149437525,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"15:07","end":"16:43","startHours":15.110795776110443,"endHours":16.71940740278336,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:28","end":"08:53","startHours":8.461867719195718,"endHours":8.89083081964183,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:00","end":"06:20","startHours":5.995329891630577,"endHours":6.338500371987466,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:28","end":"12:19","startHours":11.464609422318496,"endHours":12.322535623210719,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:45","end":"04:36","startHours":3.7432736142884924,"endHours":4.601199815180715,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:23","end":"05:28","startHours":4.3867182649576595,"endHours":5.459126016072938,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:02","end":"14:54","startHours":14.038388024995164,"endHours":14.896314225887387,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:08","end":"18:32","startHours":18.12801902945628,"endHours":18.528019029456278,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:20","end":"18:52","startHours":18.32801902945628,"endHours":18.864222905013918,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:05","end":"19:50","startHours":18.07801902945628,"endHours":19.82801902945628,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:28","end":"00:19","startHours":23.464609422318496,"endHours":24.32253562321072,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Udveg","start":"05:28","end":"07:04","startHours":5.459126016072938,"endHours":7.067737642745856,"quality":"inauspicious"},{"name":"Chala","start":"07:04","end":"08:41","startHours":7.067737642745856,"endHours":8.676349269418774,"quality":"neutral"},{"name":"Labha","start":"08:41","end":"10:17","startHours":8.676349269418774,"endHours":10.28496089609169,"quality":"auspicious"},{"name":"Amṛta","start":"10:17","end":"11:54","startHours":10.28496089609169,"endHours":11.893572522764607,"quality":"auspicious"},{"name":"Kāla","start":"11:54","end":"13:30","startHours":11.893572522764607,"endHours":13.502184149437525,"quality":"inauspicious"},{"name":"Śubha","start":"13:30","end":"15:07","startHours":13.502184149437525,"endHours":15.110795776110443,"quality":"auspicious"},{"name":"Roga","start":"15:07","end":"16:43","startHours":15.110795776110443,"endHours":16.71940740278336,"quality":"inauspicious"},{"name":"Udveg","start":"16:43","end":"18:20","startHours":16.71940740278336,"endHours":18.32801902945628,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Śubha","start":"18:20","end":"19:43","startHours":18.32801902945628,"endHours":19.71940740278336,"quality":"auspicious"},{"name":"Roga","start":"19:43","end":"21:07","startHours":19.71940740278336,"endHours":21.110795776110443,"quality":"inauspicious"},{"name":"Udveg","start":"21:07","end":"22:30","startHours":21.110795776110443,"endHours":22.502184149437525,"quality":"inauspicious"},{"name":"Chala","start":"22:30","end":"23:54","startHours":22.502184149437525,"endHours":23.893572522764607,"quality":"neutral"},{"name":"Labha","start":"23:54","end":"01:17","startHours":23.893572522764607,"endHours":25.28496089609169,"quality":"auspicious"},{"name":"Amṛta","start":"01:17","end":"02:41","startHours":25.28496089609169,"endHours":26.676349269418772,"quality":"auspicious"},{"name":"Kāla","start":"02:41","end":"04:04","startHours":26.676349269418772,"endHours":28.067737642745854,"quality":"inauspicious"},{"name":"Śubha","start":"04:04","end":"05:28","startHours":28.067737642745854,"endHours":29.459126016072936,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"05:28","end":"06:28","startHours":5.459126016072938,"endHours":6.459126016072938,"planetary_lord":"Sun"},{"name":"Hora 2","start":"06:28","end":"07:28","startHours":6.459126016072938,"endHours":7.459126016072938,"planetary_lord":"Mars"},{"name":"Hora 3","start":"07:28","end":"08:28","startHours":7.459126016072938,"endHours":8.459126016072938,"planetary_lord":"Jupiter"},{"name":"Hora 4","start":"08:28","end":"09:28","startHours":8.459126016072938,"endHours":9.459126016072938,"planetary_lord":"Saturn"},{"name":"Hora 5","start":"09:28","end":"10:28","startHours":9.459126016072938,"endHours":10.459126016072938,"planetary_lord":"Moon"},{"name":"Hora 6","start":"10:28","end":"11:28","startHours":10.459126016072938,"endHours":11.459126016072938,"planetary_lord":"Mercury"},{"name":"Hora 7","start":"11:28","end":"12:28","startHours":11.459126016072938,"endHours":12.459126016072938,"planetary_lord":"Venus"},{"name":"Hora 8","start":"12:28","end":"13:28","startHours":12.459126016072938,"endHours":13.459126016072938,"planetary_lord":"Sun"},{"name":"Hora 9","start":"13:28","end":"14:28","startHours":13.459126016072938,"endHours":14.459126016072938,"planetary_lord":"Mars"},{"name":"Hora 10","start":"14:28","end":"15:28","startHours":14.459126016072938,"endHours":15.459126016072938,"planetary_lord":"Jupiter"},{"name":"Hora 11","start":"15:28","end":"16:28","startHours":15.459126016072938,"endHours":16.459126016072936,"planetary_lord":"Saturn"},{"name":"Hora 12","start":"16:28","end":"17:28","startHours":16.459126016072936,"endHours":17.459126016072936,"planetary_lord":"Moon"},{"name":"Hora 13","start":"17:28","end":"18:28","startHours":17.459126016072936,"endHours":18.459126016072936,"planetary_lord":"Mercury"},{"name":"Hora 14","start":"18:28","end":"19:28","startHours":18.459126016072936,"endHours":19.459126016072936,"planetary_lord":"Venus"},{"name":"Hora 15","start":"19:28","end":"20:28","startHours":19.459126016072936,"endHours":20.459126016072936,"planetary_lord":"Sun"},{"name":"Hora 16","start":"20:28","end":"21:28","startHours":20.459126016072936,"endHours":21.459126016072936,"planetary_lord":"Mars"},{"name":"Hora 17","start":"21:28","end":"22:28","startHours":21.459126016072936,"endHours":22.459126016072936,"planetary_lord":"Jupiter"},{"name":"Hora 18","start":"22:28","end":"23:28","startHours":22.459126016072936,"endHours":23.459126016072936,"planetary_lord":"Saturn"},{"name":"Hora 19","start":"23:28","end":"00:28","startHours":23.459126016072936,"endHours":24.459126016072936,"planetary_lord":"Moon"},{"name":"Hora 20","start":"00:28","end":"01:28","startHours":24.459126016072936,"endHours":25.459126016072936,"planetary_lord":"Mercury"},{"name":"Hora 21","start":"01:28","end":"02:28","startHours":25.459126016072936,"endHours":26.459126016072936,"planetary_lord":"Venus"},{"name":"Hora 22","start":"02:28","end":"03:28","startHours":26.459126016072936,"endHours":27.459126016072936,"planetary_lord":"Sun"},{"name":"Hora 23","start":"03:28","end":"04:28","startHours":27.459126016072936,"endHours":28.459126016072936,"planetary_lord":"Mars"},{"name":"Hora 24","start":"04:28","end":"05:28","startHours":28.459126016072936,"endHours":29.459126016072936,"planetary_lord":"Jupiter"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Rohiṇī","Mṛgaśirā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Citrā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā"],"unfavorable_nakshatras":["Ārdrā","Punarvasu","Puṣya","Aśleṣā","Svātī","Viśākhā","Anurādhā","Jyeṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Vṛṣabha","Siṃha","Kanyā","Dhanu","Makara","Mīna"],"unfavorable_rashis":["Meṣa","Mithuna","Karka","Tulā","Vṛścika","Kumbha"]},"dishaShool":"West (Paścim)","chandraVasa":"South-West","rahuVasa":"North-East","anandadiYoga":{"name":"Sushira","quality":"Auspicious"},"tropicalRitu":"Vasanta (Spring) (tropical)","vedicRitu":"Śiśira (Winter)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":5.976507910394617,"eotMinutes":-3.095151365876405,"ayanamsa":23.5912}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Caitra","lunar_month_paksha_full":"Caitra Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Caitra","lunar_month_amanta":"Caitra","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Mīna (Paṅkuṇi)","ritu":"Vasanta (Spring)","display_summary":"Caitra Śukla Pratipada · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"chaitra-navratri-start","name":"Caitra Navrātri Start (Gudhi Padwā)","name_sanskrit":"चैत्र नवरात्रि आरम्भ","tradition":"Shakta","associated_deity":"Devī Durgā (9 forms over 9 nights)","significance":"Spring Navrātri begins; Vasanta-pakṣa Devī worship. Maharashtra: Gudhi Padwā. South: Ugadi. Sindhi: Cheti Chand.","vrata":true,"detection":{"tithi_number":1,"tithi_paksha":"Śukla","lunar_month":"Caitra"},"precedence":1}],"todays_walk":{"walk":{"id":"surya-walk","name":"Sūrya Walk","name_sanskrit":"सूर्य यात्रा","type":"graha","description":"Self-illumination + BG 4.1 (Sun-lineage of Gītā transmission).","step_count":6,"url":"/walk/surya-walk"},"reason":"Ravivāra (Sunday) — 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 April 5, 1981 CE · Chicago, USA · Vidhyamitra","description":"April 5, 1981 CE for Chicago, USA: Śukla Pratipada, sūryodaya 05:28, sūryāsta 18:20.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/chicago/1981-04-05","hreflang_alternates":{"en":"https://vidhyamitra.com/city/chicago/1981-04-05","sa":"https://sa.vidhyamitra.com/city/chicago/1981-04-05","hi":"https://hi.vidhyamitra.com/city/chicago/1981-04-05","x-default":"https://vidhyamitra.com/city/chicago/1981-04-05"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-01T19:42:14.018Z","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":"2026-06-01T19:42:14.018Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-01T19:42:14.018Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}