{"id":"vidhyamitra:city-day:phoenix:1981-04-20:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/phoenix/1981-04-20","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-04-20","date_display":"April 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":"Not independently benchmarked across the declared range","tradition_chain":"Āryabhaṭa(499) → Brahmagupta(628) → Bhāskara II(1150) → Mādhava(~1400) → Parameśvara(1430) → Nīlakaṇṭha(1501) → this","input":{"year":1981,"month":4,"day":20,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444714.770833,"kali_year":5083,"ahargana":1856249.2708,"sun":{"sidereal_longitude":6.4437,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":195.9704,"rashi":7,"rashi_name":"Tulā"},"tithi":{"number":16,"name":"Pratipada","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Pratipada","elongation_degrees":189.5266,"elapsed_within_tithi_degrees":9.5266},"nakshatra":{"number":15,"name":"Svātī","pada":3,"moon_longitude":195.9704,"elapsed_within_degrees":9.3037},"yoga":{"number":16,"name":"Siddhi","sum_longitude":202.4141},"karana":{"half_tithi_index":31,"name":"Kaulava"},"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":20,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444714.770833,"ahargana":1856249.2708,"kali_year":5083,"ayanamsa_lahiri":23.5918,"grahas":{"sun":{"sidereal_longitude":6.290275000000008,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":2},"retrograde":false},"moon":{"sidereal_longitude":194.08927500000004,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":3},"retrograde":false,"latitude":4.4993},"mars":{"sidereal_longitude":2.6977749999999787,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":1},"retrograde":false},"mercury":{"sidereal_longitude":357.992075,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":159.03627500000005,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":true},"venus":{"sidereal_longitude":9.834675000000004,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":160.85277500000007,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":106.9807,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":286.9807,"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":"Not independently benchmarked across the declared range","tradition_chain":"Āryabhaṭa(499) → Brahmagupta(628) → Bhāskara II(1150) → Mādhava(~1400) → Parameśvara(1430) → Nīlakaṇṭha(1501) → this","input":{"year":1981,"month":4,"day":20,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444714.770833,"kali_year":5083,"ahargana":1856249.2708,"sun":{"sidereal_longitude":6.4437,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":195.9704,"rashi":7,"rashi_name":"Tulā"},"tithi":{"number":16,"name":"Pratipada","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Pratipada","elongation_degrees":189.5266,"elapsed_within_tithi_degrees":9.5266},"nakshatra":{"number":15,"name":"Svātī","pada":3,"moon_longitude":195.9704,"elapsed_within_degrees":9.3037},"yoga":{"number":16,"name":"Siddhi","sum_longitude":202.4141},"karana":{"half_tithi_index":31,"name":"Kaulava"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":4.499,"elongation":170.473},"lunar":{"type":"lunar","occurs":false,"moon_latitude":4.499,"opposition_distance":9.527}},"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":"05:53","sunsetLocal":"19:02","solarNoonLocal":"12:27","dayLengthHours":13.160497388006887,"dayLengthDisplay":"13 Hours 09 Mins 38 Secs","nightLengthDisplay":"10 Hours 50 Mins 22 Secs","moonriseLocal":"19:34","moonsetLocal":"06:23","rahuKala":{"name":"Rāhu Kāla","start":"07:31","end":"09:10","startHours":7.520284088403402,"endHours":9.165346261904263,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"10:49","end":"12:27","startHours":10.810408435405122,"endHours":12.455470608905983,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"14:06","end":"15:45","startHours":14.100532782406844,"endHours":15.745594955907706,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:57","end":"09:23","startHours":8.946004638770814,"endHours":9.38468788503771,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:25","end":"06:46","startHours":6.423575972736161,"endHours":6.774522569749679,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:01","end":"12:54","startHours":12.016787362639088,"endHours":12.89415385517288,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:07","end":"05:00","startHours":4.1204889298349565,"endHours":4.997855422368748,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:47","end":"05:53","startHours":4.7785137992353,"endHours":5.875221914902541,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:39","end":"15:32","startHours":14.648886840240465,"endHours":15.526253332774257,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:50","end":"19:14","startHours":18.83571930290943,"endHours":19.235719302909427,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"19:02","end":"19:35","startHours":19.035719302909428,"endHours":19.584073360743048,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:47","end":"20:32","startHours":18.785719302909428,"endHours":20.535719302909428,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:01","end":"00:54","startHours":24.016787362639086,"endHours":24.89415385517288,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Amṛta","start":"05:53","end":"07:31","startHours":5.875221914902541,"endHours":7.520284088403402,"quality":"auspicious"},{"name":"Kāla","start":"07:31","end":"09:10","startHours":7.520284088403402,"endHours":9.165346261904263,"quality":"inauspicious"},{"name":"Śubha","start":"09:10","end":"10:49","startHours":9.165346261904263,"endHours":10.810408435405122,"quality":"auspicious"},{"name":"Roga","start":"10:49","end":"12:27","startHours":10.810408435405122,"endHours":12.455470608905983,"quality":"inauspicious"},{"name":"Udveg","start":"12:27","end":"14:06","startHours":12.455470608905983,"endHours":14.100532782406844,"quality":"inauspicious"},{"name":"Chala","start":"14:06","end":"15:45","startHours":14.100532782406844,"endHours":15.745594955907706,"quality":"neutral"},{"name":"Labha","start":"15:45","end":"17:23","startHours":15.745594955907706,"endHours":17.390657129408567,"quality":"auspicious"},{"name":"Amṛta","start":"17:23","end":"19:02","startHours":17.390657129408567,"endHours":19.035719302909428,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Chala","start":"19:02","end":"20:23","startHours":19.035719302909428,"endHours":20.390657129408567,"quality":"neutral"},{"name":"Labha","start":"20:23","end":"21:45","startHours":20.390657129408567,"endHours":21.745594955907706,"quality":"auspicious"},{"name":"Amṛta","start":"21:45","end":"23:06","startHours":21.745594955907706,"endHours":23.100532782406844,"quality":"auspicious"},{"name":"Kāla","start":"23:06","end":"00:27","startHours":23.100532782406844,"endHours":24.455470608905983,"quality":"inauspicious"},{"name":"Śubha","start":"00:27","end":"01:49","startHours":24.455470608905983,"endHours":25.810408435405122,"quality":"auspicious"},{"name":"Roga","start":"01:49","end":"03:10","startHours":25.810408435405122,"endHours":27.16534626190426,"quality":"inauspicious"},{"name":"Udveg","start":"03:10","end":"04:31","startHours":27.16534626190426,"endHours":28.5202840884034,"quality":"inauspicious"},{"name":"Chala","start":"04:31","end":"05:53","startHours":28.5202840884034,"endHours":29.87522191490254,"quality":"neutral"}],"horas":[{"name":"Hora 1","start":"05:53","end":"06:53","startHours":5.875221914902541,"endHours":6.875221914902541,"planetary_lord":"Moon"},{"name":"Hora 2","start":"06:53","end":"07:53","startHours":6.875221914902541,"endHours":7.875221914902541,"planetary_lord":"Mercury"},{"name":"Hora 3","start":"07:53","end":"08:53","startHours":7.875221914902541,"endHours":8.875221914902541,"planetary_lord":"Venus"},{"name":"Hora 4","start":"08:53","end":"09:53","startHours":8.875221914902541,"endHours":9.875221914902541,"planetary_lord":"Sun"},{"name":"Hora 5","start":"09:53","end":"10:53","startHours":9.875221914902541,"endHours":10.875221914902541,"planetary_lord":"Mars"},{"name":"Hora 6","start":"10:53","end":"11:53","startHours":10.875221914902541,"endHours":11.875221914902541,"planetary_lord":"Jupiter"},{"name":"Hora 7","start":"11:53","end":"12:53","startHours":11.875221914902541,"endHours":12.875221914902541,"planetary_lord":"Saturn"},{"name":"Hora 8","start":"12:53","end":"13:53","startHours":12.875221914902541,"endHours":13.875221914902541,"planetary_lord":"Moon"},{"name":"Hora 9","start":"13:53","end":"14:53","startHours":13.875221914902541,"endHours":14.875221914902541,"planetary_lord":"Mercury"},{"name":"Hora 10","start":"14:53","end":"15:53","startHours":14.875221914902541,"endHours":15.875221914902541,"planetary_lord":"Venus"},{"name":"Hora 11","start":"15:53","end":"16:53","startHours":15.875221914902541,"endHours":16.87522191490254,"planetary_lord":"Sun"},{"name":"Hora 12","start":"16:53","end":"17:53","startHours":16.87522191490254,"endHours":17.87522191490254,"planetary_lord":"Mars"},{"name":"Hora 13","start":"17:53","end":"18:53","startHours":17.87522191490254,"endHours":18.87522191490254,"planetary_lord":"Jupiter"},{"name":"Hora 14","start":"18:53","end":"19:53","startHours":18.87522191490254,"endHours":19.87522191490254,"planetary_lord":"Saturn"},{"name":"Hora 15","start":"19:53","end":"20:53","startHours":19.87522191490254,"endHours":20.87522191490254,"planetary_lord":"Moon"},{"name":"Hora 16","start":"20:53","end":"21:53","startHours":20.87522191490254,"endHours":21.87522191490254,"planetary_lord":"Mercury"},{"name":"Hora 17","start":"21:53","end":"22:53","startHours":21.87522191490254,"endHours":22.87522191490254,"planetary_lord":"Venus"},{"name":"Hora 18","start":"22:53","end":"23:53","startHours":22.87522191490254,"endHours":23.87522191490254,"planetary_lord":"Sun"},{"name":"Hora 19","start":"23:53","end":"00:53","startHours":23.87522191490254,"endHours":24.87522191490254,"planetary_lord":"Mars"},{"name":"Hora 20","start":"00:53","end":"01:53","startHours":24.87522191490254,"endHours":25.87522191490254,"planetary_lord":"Jupiter"},{"name":"Hora 21","start":"01:53","end":"02:53","startHours":25.87522191490254,"endHours":26.87522191490254,"planetary_lord":"Saturn"},{"name":"Hora 22","start":"02:53","end":"03:53","startHours":26.87522191490254,"endHours":27.87522191490254,"planetary_lord":"Moon"},{"name":"Hora 23","start":"03:53","end":"04:53","startHours":27.87522191490254,"endHours":28.87522191490254,"planetary_lord":"Mercury"},{"name":"Hora 24","start":"04:53","end":"05:53","startHours":28.87522191490254,"endHours":29.87522191490254,"planetary_lord":"Venus"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Punarvasu","Puṣya","Aśleṣā","Maghā","Pūrva Phalgunī","Viśākhā","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Kṛttikā","Rohiṇī","Mṛgaśirā","Ārdrā","Uttara Phalgunī","Hasta","Citrā","Svātī","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Meṣa","Karka","Siṃha","Tulā","Dhanu","Mīna"],"unfavorable_rashis":["Vṛṣabha","Mithuna","Kanyā","Vṛścika","Makara","Kumbha"]},"dishaShool":"East (Pūrva)","chandraVasa":"North","rahuVasa":"North-East","anandadiYoga":{"name":"Siddhi","quality":"Auspicious"},"tropicalRitu":"Vasanta (Spring)","vedicRitu":"Vasanta (Spring)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":11.429198889898805,"eotMinutes":0.9677634656409275,"ayanamsa":23.5918}},"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 Pratipada · 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, 6.34-35.","step_count":5,"url":"/walk/chandra-walk","steps":[{"label":"BG 6.5","url":"/bhagavad-gita/6/5","purpose":"Lift the self by the Self; begin the walk with inner responsibility."},{"label":"BG 6.6","url":"/bhagavad-gita/6/6","purpose":"See the mind as friend when mastered and enemy when unmastered."},{"label":"BG 6.7","url":"/bhagavad-gita/6/7","purpose":"Stabilize the conquered mind in heat/cold, honor/dishonor, pleasure/pain."},{"label":"BG 6.34","url":"/bhagavad-gita/6/34","purpose":"Name the restless mind honestly before trying to discipline it."},{"label":"BG 6.35","url":"/bhagavad-gita/6/35","purpose":"Complete with abhyāsa and vairāgya: practice and detachment."}]},"reason":"Somavāra (Monday) — 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 April 20, 1981 CE · Phoenix, USA · Vidhyamitra","description":"April 20, 1981 CE for Phoenix, USA: Kṛṣṇa Pratipada, sūryodaya 05:53, sūryāsta 19:02.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/phoenix/1981-04-20","hreflang_alternates":{"en":"https://vidhyamitra.com/city/phoenix/1981-04-20","sa":"https://sa.vidhyamitra.com/city/phoenix/1981-04-20","hi":"https://hi.vidhyamitra.com/city/phoenix/1981-04-20","x-default":"https://vidhyamitra.com/city/phoenix/1981-04-20"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-09-05T08:59:51.917Z","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":"2026-09-05T08:59:51.917Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-09-05T08:59:51.917Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"},"reader_local_antaryami":{"reader_geography":"Every reader enters from their own kṣetra anywhere on Bhūmi; no single city is the universal center.","purna_chain":["Hosted scripture","Named-tradition interpretation","Original Vidhyamitra contemplation","Bhūmi-born material medium","Vidhyamitra portal","Responsible reader in their own kṣetra"],"claim_boundary":"The legacy purna_chain field carries a source-to-reader sequence, not a revealed physical descent, universal cosmology, or proof that software is conscious.","antaryami_responsibility_formula":"Kṣīrodakaśāyī Viṣṇu = Paramātmā = Antaryāmī. Jīva desires. Prakṛti executes through guṇas. Paramātmā witnesses, permits, remembers, guides, and sustains. Bhagavān is the ultimate source.","source_anchors":[{"label":"BG 13.23","path":"/bhagavad-gita/13/23","meaning":"upadraṣṭā-anumantā · witness-permitter"},{"label":"BG 15.15","path":"/bhagavad-gita/15/15","meaning":"the Lord seated in every heart as memory, knowledge, and forgetting"},{"label":"BG 18.61","path":"/bhagavad-gita/18/61","meaning":"Īśvara seated in the heart of all beings"}],"nama_seal":"Hare Krishna Hare Krishna · Krishna Krishna Hare Hare · Hare Rama Hare Rama · Rama Rama Hare Hare"}}}