{"id":"vidhyamitra:city-day:chicago:1981-04-27:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/chicago/1981-04-27","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-04-27","date_display":"April 27, 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":27,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444721.770833,"kali_year":5083,"ahargana":1856256.2708,"sun":{"sidereal_longitude":13.234,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":282.4586,"rashi":10,"rashi_name":"Makara"},"tithi":{"number":23,"name":"Aṣṭamī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Aṣṭamī","elongation_degrees":269.2246,"elapsed_within_tithi_degrees":5.2246},"nakshatra":{"number":22,"name":"Śravaṇa","pada":1,"moon_longitude":282.4586,"elapsed_within_degrees":2.4586},"yoga":{"number":23,"name":"Śubha","sum_longitude":295.6927},"karana":{"half_tithi_index":44,"name":"Bālava"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"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":27,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444721.770833,"ahargana":1856256.2708,"kali_year":5083,"ayanamsa_lahiri":23.592,"grahas":{"sun":{"sidereal_longitude":13.110907999999995,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":4},"retrograde":false},"moon":{"sidereal_longitude":278.654308,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":4},"retrograde":false,"latitude":0.3254},"mars":{"sidereal_longitude":7.960107999999991,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":12.47550799999999,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":158.37830800000006,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":true},"venus":{"sidereal_longitude":18.47670800000003,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":2,"name":"Bharaṇī","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":160.40730800000006,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":106.6098,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":286.6098,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","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":1981,"month":4,"day":27,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444721.770833,"kali_year":5083,"ahargana":1856256.2708,"sun":{"sidereal_longitude":13.234,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":282.4586,"rashi":10,"rashi_name":"Makara"},"tithi":{"number":23,"name":"Aṣṭamī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Aṣṭamī","elongation_degrees":269.2246,"elapsed_within_tithi_degrees":5.2246},"nakshatra":{"number":22,"name":"Śravaṇa","pada":1,"moon_longitude":282.4586,"elapsed_within_degrees":2.4586},"yoga":{"number":23,"name":"Śubha","sum_longitude":295.6927},"karana":{"half_tithi_index":44,"name":"Bālava"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":0.325,"elongation":90.775},"lunar":{"type":"lunar","occurs":false,"moon_latitude":0.325,"opposition_distance":89.225}},"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":"04:53","sunsetLocal":"18:44","solarNoonLocal":"11:48","dayLengthHours":13.8477065970322,"dayLengthDisplay":"13 Hours 50 Mins 52 Secs","nightLengthDisplay":"10 Hours 09 Mins 08 Secs","moonriseLocal":"00:42","moonsetLocal":"10:19","rahuKala":{"name":"Rāhu Kāla","start":"06:37","end":"08:20","startHours":6.610228878619455,"endHours":8.341192203248479,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"10:04","end":"11:48","startHours":10.072155527877506,"endHours":11.803118852506529,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"13:32","end":"15:16","startHours":13.534082177135556,"endHours":15.265045501764579,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:07","end":"08:34","startHours":8.110397093297943,"endHours":8.571987313199017,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"05:27","end":"05:50","startHours":5.456253328866771,"endHours":5.82552550478763,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:20","end":"12:16","startHours":11.341528632605456,"endHours":12.264709072407602,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:02","end":"03:57","startHours":3.0329046743861365,"endHours":3.956085114188283,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"03:44","end":"04:53","startHours":3.7252900042377464,"endHours":4.87926555399043,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:07","end":"15:02","startHours":14.111069952011896,"endHours":15.034250391814043,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:32","end":"18:56","startHours":18.52697215102263,"endHours":18.92697215102263,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:44","end":"19:18","startHours":18.72697215102263,"endHours":19.303959925898972,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:29","end":"20:14","startHours":18.47697215102263,"endHours":20.22697215102263,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:20","end":"00:16","startHours":23.341528632605456,"endHours":24.2647090724076,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Amṛta","start":"04:53","end":"06:37","startHours":4.87926555399043,"endHours":6.610228878619455,"quality":"auspicious"},{"name":"Kāla","start":"06:37","end":"08:20","startHours":6.610228878619455,"endHours":8.341192203248479,"quality":"inauspicious"},{"name":"Śubha","start":"08:20","end":"10:04","startHours":8.341192203248479,"endHours":10.072155527877506,"quality":"auspicious"},{"name":"Roga","start":"10:04","end":"11:48","startHours":10.072155527877506,"endHours":11.803118852506529,"quality":"inauspicious"},{"name":"Udveg","start":"11:48","end":"13:32","startHours":11.803118852506529,"endHours":13.534082177135556,"quality":"inauspicious"},{"name":"Chala","start":"13:32","end":"15:16","startHours":13.534082177135556,"endHours":15.265045501764579,"quality":"neutral"},{"name":"Labha","start":"15:16","end":"17:00","startHours":15.265045501764579,"endHours":16.996008826393606,"quality":"auspicious"},{"name":"Amṛta","start":"17:00","end":"18:44","startHours":16.996008826393606,"endHours":18.72697215102263,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Chala","start":"18:44","end":"20:00","startHours":18.72697215102263,"endHours":19.996008826393606,"quality":"neutral"},{"name":"Labha","start":"20:00","end":"21:16","startHours":19.996008826393606,"endHours":21.26504550176458,"quality":"auspicious"},{"name":"Amṛta","start":"21:16","end":"22:32","startHours":21.26504550176458,"endHours":22.534082177135552,"quality":"auspicious"},{"name":"Kāla","start":"22:32","end":"23:48","startHours":22.534082177135552,"endHours":23.80311885250653,"quality":"inauspicious"},{"name":"Śubha","start":"23:48","end":"01:04","startHours":23.80311885250653,"endHours":25.072155527877506,"quality":"auspicious"},{"name":"Roga","start":"01:04","end":"02:20","startHours":25.072155527877506,"endHours":26.34119220324848,"quality":"inauspicious"},{"name":"Udveg","start":"02:20","end":"03:37","startHours":26.34119220324848,"endHours":27.610228878619452,"quality":"inauspicious"},{"name":"Chala","start":"03:37","end":"04:53","startHours":27.610228878619452,"endHours":28.87926555399043,"quality":"neutral"}],"horas":[{"name":"Hora 1","start":"04:53","end":"05:53","startHours":4.87926555399043,"endHours":5.87926555399043,"planetary_lord":"Moon"},{"name":"Hora 2","start":"05:53","end":"06:53","startHours":5.87926555399043,"endHours":6.87926555399043,"planetary_lord":"Mercury"},{"name":"Hora 3","start":"06:53","end":"07:53","startHours":6.87926555399043,"endHours":7.87926555399043,"planetary_lord":"Venus"},{"name":"Hora 4","start":"07:53","end":"08:53","startHours":7.87926555399043,"endHours":8.879265553990429,"planetary_lord":"Sun"},{"name":"Hora 5","start":"08:53","end":"09:53","startHours":8.879265553990429,"endHours":9.879265553990429,"planetary_lord":"Mars"},{"name":"Hora 6","start":"09:53","end":"10:53","startHours":9.879265553990429,"endHours":10.879265553990429,"planetary_lord":"Jupiter"},{"name":"Hora 7","start":"10:53","end":"11:53","startHours":10.879265553990429,"endHours":11.879265553990429,"planetary_lord":"Saturn"},{"name":"Hora 8","start":"11:53","end":"12:53","startHours":11.879265553990429,"endHours":12.879265553990429,"planetary_lord":"Moon"},{"name":"Hora 9","start":"12:53","end":"13:53","startHours":12.879265553990429,"endHours":13.879265553990429,"planetary_lord":"Mercury"},{"name":"Hora 10","start":"13:53","end":"14:53","startHours":13.879265553990429,"endHours":14.879265553990429,"planetary_lord":"Venus"},{"name":"Hora 11","start":"14:53","end":"15:53","startHours":14.879265553990429,"endHours":15.879265553990429,"planetary_lord":"Sun"},{"name":"Hora 12","start":"15:53","end":"16:53","startHours":15.879265553990429,"endHours":16.87926555399043,"planetary_lord":"Mars"},{"name":"Hora 13","start":"16:53","end":"17:53","startHours":16.87926555399043,"endHours":17.87926555399043,"planetary_lord":"Jupiter"},{"name":"Hora 14","start":"17:53","end":"18:53","startHours":17.87926555399043,"endHours":18.87926555399043,"planetary_lord":"Saturn"},{"name":"Hora 15","start":"18:53","end":"19:53","startHours":18.87926555399043,"endHours":19.87926555399043,"planetary_lord":"Moon"},{"name":"Hora 16","start":"19:53","end":"20:53","startHours":19.87926555399043,"endHours":20.87926555399043,"planetary_lord":"Mercury"},{"name":"Hora 17","start":"20:53","end":"21:53","startHours":20.87926555399043,"endHours":21.87926555399043,"planetary_lord":"Venus"},{"name":"Hora 18","start":"21:53","end":"22:53","startHours":21.87926555399043,"endHours":22.87926555399043,"planetary_lord":"Sun"},{"name":"Hora 19","start":"22:53","end":"23:53","startHours":22.87926555399043,"endHours":23.87926555399043,"planetary_lord":"Mars"},{"name":"Hora 20","start":"23:53","end":"00:53","startHours":23.87926555399043,"endHours":24.87926555399043,"planetary_lord":"Jupiter"},{"name":"Hora 21","start":"00:53","end":"01:53","startHours":24.87926555399043,"endHours":25.87926555399043,"planetary_lord":"Saturn"},{"name":"Hora 22","start":"01:53","end":"02:53","startHours":25.87926555399043,"endHours":26.87926555399043,"planetary_lord":"Moon"},{"name":"Hora 23","start":"02:53","end":"03:53","startHours":26.87926555399043,"endHours":27.87926555399043,"planetary_lord":"Mercury"},{"name":"Hora 24","start":"03:53","end":"04:53","startHours":27.87926555399043,"endHours":28.87926555399043,"planetary_lord":"Venus"}],"taraBala":{"favorable_nakshatras":["Mṛgaśirā","Ārdrā","Punarvasu","Puṣya","Aśleṣā","Citrā","Svātī","Viśākhā","Anurādhā","Jyeṣṭhā","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Rohiṇī","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Mithuna","Karka","Tulā","Vṛścika","Makara","Mīna"],"unfavorable_rashis":["Meṣa","Vṛṣabha","Siṃha","Kanyā","Dhanu","Kumbha"]},"dishaShool":"East (Pūrva)","chandraVasa":"South-East","rahuVasa":"North-East","anandadiYoga":{"name":"Cara","quality":"Auspicious"},"tropicalRitu":"Vasanta (Spring) (tropical)","vedicRitu":"Vasanta (Spring)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":13.751487226176703,"eotMinutes":2.332068849608316,"ayanamsa":23.592}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Vaiśākha","lunar_month_paksha_full":"Vaiśākha Kṛṣṇa Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Vaiśākha","lunar_month_amanta":"Caitra","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Mēsha (Cittirai / Vaiśākhī)","ritu":"Vasanta (Spring)","display_summary":"Vaiśākha Kṛṣṇa Aṣṭamī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[],"todays_walk":{"walk":{"id":"chandra-walk","name":"Candra Walk","name_sanskrit":"चन्द्र यात्रा","type":"graha","description":"Manas-control + BG 6.5-7.","step_count":5,"url":"/walk/chandra-walk"},"reason":"Somavāra (Monday) — its presiding graha's walk."},"cosmic_resonances":[{"historical_date":"-3226-07-09","event":"Bhagavān Krishna's birth at Mathurā","chart_id":"krishna","shared_marker":"same Kṛṣṇa Aṣṭamī","url":"/day/-3226-07-09","relevance":0.5}]},"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 27, 1981 CE · Chicago, USA · Vidhyamitra","description":"April 27, 1981 CE for Chicago, USA: Kṛṣṇa Aṣṭamī, sūryodaya 04:53, sūryāsta 18:44.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/chicago/1981-04-27","hreflang_alternates":{"en":"https://vidhyamitra.com/city/chicago/1981-04-27","sa":"https://sa.vidhyamitra.com/city/chicago/1981-04-27","hi":"https://hi.vidhyamitra.com/city/chicago/1981-04-27","x-default":"https://vidhyamitra.com/city/chicago/1981-04-27"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-02T04:43:33.008Z","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":"2026-06-02T04:43:33.008Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-02T04:43:33.008Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}