{"id":"vidhyamitra:city-day:phoenix:1981-05-01:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/phoenix/1981-05-01","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-05-01","date_display":"May 1, 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":5,"day":1,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444725.770833,"kali_year":5083,"ahargana":1856260.2708,"sun":{"sidereal_longitude":17.1009,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":335.0246,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":27,"name":"Dvādaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Dvādaśī","elongation_degrees":317.9237,"elapsed_within_tithi_degrees":5.9237},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":1,"moon_longitude":335.0246,"elapsed_within_degrees":1.6913},"yoga":{"number":27,"name":"Vaidhṛti","sum_longitude":352.1255},"karana":{"half_tithi_index":52,"name":"Kaulava"},"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":5,"day":1,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444725.770833,"ahargana":1856260.2708,"kali_year":5083,"ayanamsa_lahiri":23.5922,"grahas":{"sun":{"sidereal_longitude":16.997554999999977,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":2,"name":"Bharaṇī","pada":2},"retrograde":false},"moon":{"sidereal_longitude":332.8309549999999,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":4},"retrograde":false,"latitude":-3.3754},"mars":{"sidereal_longitude":10.949254999999994,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":21.101954999999975,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":2,"name":"Bharaṇī","pada":3},"retrograde":false},"jupiter":{"sidereal_longitude":158.05405499999995,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":true},"venus":{"sidereal_longitude":23.409355000000005,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":2,"name":"Bharaṇī","pada":4},"retrograde":false},"saturn":{"sidereal_longitude":160.17725499999995,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":106.3979,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":286.3979,"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":5,"day":1,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444725.770833,"kali_year":5083,"ahargana":1856260.2708,"sun":{"sidereal_longitude":17.1009,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":335.0246,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":27,"name":"Dvādaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Dvādaśī","elongation_degrees":317.9237,"elapsed_within_tithi_degrees":5.9237},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":1,"moon_longitude":335.0246,"elapsed_within_degrees":1.6913},"yoga":{"number":27,"name":"Vaidhṛti","sum_longitude":352.1255},"karana":{"half_tithi_index":52,"name":"Kaulava"},"vara":{"number":0,"name":"Śukravāra (Friday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-3.375,"elongation":42.076},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-3.375,"opposition_distance":137.924}},"eclipse_window_40days":[]},"city":{"slug":"phoenix","name":"Phoenix, USA","lat":33.4484,"lon":-112.074,"tz_offset_hours":-7,"country":"US","tier":"diaspora"},"tier2":{"city":{"slug":"phoenix","name":"Phoenix, USA","lat":33.4484,"lon":-112.074,"tz_offset_hours":-7,"country":"US","tier":"diaspora"},"sunriseLocal":"05:40","sunsetLocal":"19:10","solarNoonLocal":"12:25","dayLengthHours":13.499409326037323,"dayLengthDisplay":"13 Hours 29 Mins 58 Secs","nightLengthDisplay":"10 Hours 30 Mins 02 Secs","moonriseLocal":"03:30","moonsetLocal":"15:28","rahuKala":{"name":"Rāhu Kāla","start":"10:44","end":"12:25","startHours":10.735540378762554,"endHours":12.42296654451722,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"15:48","end":"17:29","startHours":15.79781887602655,"endHours":17.485245041781216,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"07:22","end":"09:03","startHours":7.360688047253223,"endHours":9.048114213007889,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:49","end":"09:16","startHours":8.823124057573933,"endHours":9.273104368441844,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:14","end":"06:36","startHours":6.235737270083447,"endHours":6.595721518777776,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:58","end":"12:52","startHours":11.972986233649308,"endHours":12.87294685538513,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:52","end":"04:46","startHours":3.8733406380269146,"endHours":4.773301259762736,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:33","end":"05:40","startHours":4.54831110432878,"endHours":5.673261881498558,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:40","end":"15:34","startHours":14.672868098856775,"endHours":15.572828720592597,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:58","end":"19:22","startHours":18.972671207535882,"endHours":19.37267120753588,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"19:10","end":"19:44","startHours":19.17267120753588,"endHours":19.73514659612077,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:55","end":"20:40","startHours":18.92267120753588,"endHours":20.67267120753588,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:58","end":"00:52","startHours":23.97298623364931,"endHours":24.87294685538513,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Chala","start":"05:40","end":"07:22","startHours":5.673261881498558,"endHours":7.360688047253223,"quality":"neutral"},{"name":"Labha","start":"07:22","end":"09:03","startHours":7.360688047253223,"endHours":9.048114213007889,"quality":"auspicious"},{"name":"Amṛta","start":"09:03","end":"10:44","startHours":9.048114213007889,"endHours":10.735540378762554,"quality":"auspicious"},{"name":"Kāla","start":"10:44","end":"12:25","startHours":10.735540378762554,"endHours":12.42296654451722,"quality":"inauspicious"},{"name":"Śubha","start":"12:25","end":"14:07","startHours":12.42296654451722,"endHours":14.110392710271885,"quality":"auspicious"},{"name":"Roga","start":"14:07","end":"15:48","startHours":14.110392710271885,"endHours":15.79781887602655,"quality":"inauspicious"},{"name":"Udveg","start":"15:48","end":"17:29","startHours":15.79781887602655,"endHours":17.485245041781216,"quality":"inauspicious"},{"name":"Chala","start":"17:29","end":"19:10","startHours":17.485245041781216,"endHours":19.17267120753588,"quality":"neutral"}],"nightChoghadiyas":[{"name":"Roga","start":"19:10","end":"20:29","startHours":19.17267120753588,"endHours":20.485245041781216,"quality":"inauspicious"},{"name":"Udveg","start":"20:29","end":"21:48","startHours":20.485245041781216,"endHours":21.79781887602655,"quality":"inauspicious"},{"name":"Chala","start":"21:48","end":"23:07","startHours":21.79781887602655,"endHours":23.110392710271885,"quality":"neutral"},{"name":"Labha","start":"23:07","end":"00:25","startHours":23.110392710271885,"endHours":24.42296654451722,"quality":"auspicious"},{"name":"Amṛta","start":"00:25","end":"01:44","startHours":24.42296654451722,"endHours":25.735540378762554,"quality":"auspicious"},{"name":"Kāla","start":"01:44","end":"03:03","startHours":25.735540378762554,"endHours":27.04811421300789,"quality":"inauspicious"},{"name":"Śubha","start":"03:03","end":"04:22","startHours":27.04811421300789,"endHours":28.360688047253223,"quality":"auspicious"},{"name":"Roga","start":"04:22","end":"05:40","startHours":28.360688047253223,"endHours":29.673261881498558,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"05:40","end":"06:40","startHours":5.673261881498558,"endHours":6.673261881498558,"planetary_lord":"Venus"},{"name":"Hora 2","start":"06:40","end":"07:40","startHours":6.673261881498558,"endHours":7.673261881498558,"planetary_lord":"Sun"},{"name":"Hora 3","start":"07:40","end":"08:40","startHours":7.673261881498558,"endHours":8.673261881498558,"planetary_lord":"Mars"},{"name":"Hora 4","start":"08:40","end":"09:40","startHours":8.673261881498558,"endHours":9.673261881498558,"planetary_lord":"Jupiter"},{"name":"Hora 5","start":"09:40","end":"10:40","startHours":9.673261881498558,"endHours":10.673261881498558,"planetary_lord":"Saturn"},{"name":"Hora 6","start":"10:40","end":"11:40","startHours":10.673261881498558,"endHours":11.673261881498558,"planetary_lord":"Moon"},{"name":"Hora 7","start":"11:40","end":"12:40","startHours":11.673261881498558,"endHours":12.673261881498558,"planetary_lord":"Mercury"},{"name":"Hora 8","start":"12:40","end":"13:40","startHours":12.673261881498558,"endHours":13.673261881498558,"planetary_lord":"Venus"},{"name":"Hora 9","start":"13:40","end":"14:40","startHours":13.673261881498558,"endHours":14.673261881498558,"planetary_lord":"Sun"},{"name":"Hora 10","start":"14:40","end":"15:40","startHours":14.673261881498558,"endHours":15.673261881498558,"planetary_lord":"Mars"},{"name":"Hora 11","start":"15:40","end":"16:40","startHours":15.673261881498558,"endHours":16.673261881498558,"planetary_lord":"Jupiter"},{"name":"Hora 12","start":"16:40","end":"17:40","startHours":16.673261881498558,"endHours":17.673261881498558,"planetary_lord":"Saturn"},{"name":"Hora 13","start":"17:40","end":"18:40","startHours":17.673261881498558,"endHours":18.673261881498558,"planetary_lord":"Moon"},{"name":"Hora 14","start":"18:40","end":"19:40","startHours":18.673261881498558,"endHours":19.673261881498558,"planetary_lord":"Mercury"},{"name":"Hora 15","start":"19:40","end":"20:40","startHours":19.673261881498558,"endHours":20.673261881498558,"planetary_lord":"Venus"},{"name":"Hora 16","start":"20:40","end":"21:40","startHours":20.673261881498558,"endHours":21.673261881498558,"planetary_lord":"Sun"},{"name":"Hora 17","start":"21:40","end":"22:40","startHours":21.673261881498558,"endHours":22.673261881498558,"planetary_lord":"Mars"},{"name":"Hora 18","start":"22:40","end":"23:40","startHours":22.673261881498558,"endHours":23.673261881498558,"planetary_lord":"Jupiter"},{"name":"Hora 19","start":"23:40","end":"00:40","startHours":23.673261881498558,"endHours":24.673261881498558,"planetary_lord":"Saturn"},{"name":"Hora 20","start":"00:40","end":"01:40","startHours":24.673261881498558,"endHours":25.673261881498558,"planetary_lord":"Moon"},{"name":"Hora 21","start":"01:40","end":"02:40","startHours":25.673261881498558,"endHours":26.673261881498558,"planetary_lord":"Mercury"},{"name":"Hora 22","start":"02:40","end":"03:40","startHours":26.673261881498558,"endHours":27.673261881498558,"planetary_lord":"Venus"},{"name":"Hora 23","start":"03:40","end":"04:40","startHours":27.673261881498558,"endHours":28.673261881498558,"planetary_lord":"Sun"},{"name":"Hora 24","start":"04:40","end":"05:40","startHours":28.673261881498558,"endHours":29.673261881498558,"planetary_lord":"Mars"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Rohiṇī","Aśleṣā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Revatī"],"unfavorable_nakshatras":["Mṛgaśirā","Ārdrā","Punarvasu","Puṣya","Citrā","Svātī","Viśākhā","Anurādhā","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā"],"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":"South-East","anandadiYoga":{"name":"Kāṇa","quality":"Inauspicious"},"drikRitu":"Vasanta (Spring) (Drik)","vedicRitu":"Vasanta (Spring)","drikAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":14.997685696034692,"eotMinutes":2.918007328966811,"ayanamsa":23.5922}},"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","solar_month":"Mēsha (Cittirai / Vaiśākhī)","ritu":"Vasanta (Spring)","display_summary":"Vaiśākha Kṛṣṇa Dvādaśī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"mesha-sankranti","name":"Meṣa Saṅkrānti (Vaiśākhī / Vishu / Pohelā Boishākh / Bihu)","name_sanskrit":"मेष सङ्क्रान्ति","tradition":"Pan-Hindu","associated_deity":"Sūrya Bhagavān","significance":"Sun enters Aries; solar new year. Regional: Vaiśākhī (Punjab) · Vishu (Kerala) · Pohelā Boishākh (Bengal) · Bihu (Assam) · Tamil Puthāṇḍu.","vrata":false,"detection":{"sun_rashi":"Meṣa"},"precedence":1},{"id":"baisakhi","name":"Baisakhi (Vaiśākhī)","name_sanskrit":"वैशाखी","tradition":"Regional","associated_deity":"Sūrya + Khalsa Pantha (Sikh)","significance":"Punjab New Year + Sikh Khalsa founding day.","vrata":false,"detection":{"sun_rashi":"Meṣa"},"precedence":2}],"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":"phoenix"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga May 1, 1981 CE · Phoenix, USA · Vidhyamitra","description":"May 1, 1981 CE for Phoenix, USA: Kṛṣṇa Dvādaśī, sūryodaya 05:40, sūryāsta 19:10.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/phoenix/1981-05-01","hreflang_alternates":{"en":"https://vidhyamitra.com/city/phoenix/1981-05-01","sa":"https://sa.vidhyamitra.com/city/phoenix/1981-05-01","hi":"https://hi.vidhyamitra.com/city/phoenix/1981-05-01","x-default":"https://vidhyamitra.com/city/phoenix/1981-05-01"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-18T13:04:19.590Z","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":"2026-05-18T13:04:19.590Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-18T13:04:19.590Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}