{"id":"vidhyamitra:city-day:phoenix:1981-04-12:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/phoenix/1981-04-12","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-04-12","date_display":"April 12, 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":12,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444706.770833,"kali_year":5082,"ahargana":1856241.2708,"sun":{"sidereal_longitude":358.6453,"rashi":12,"rashi_name":"Mīna"},"moon":{"sidereal_longitude":92.6097,"rashi":4,"rashi_name":"Karka"},"tithi":{"number":8,"name":"Aṣṭamī","paksha":"Śukla","full_name":"Śukla Aṣṭamī","elongation_degrees":93.9644,"elapsed_within_tithi_degrees":9.9644},"nakshatra":{"number":7,"name":"Punarvasu","pada":4,"moon_longitude":92.6097,"elapsed_within_degrees":12.6097},"yoga":{"number":7,"name":"Sukarma","sum_longitude":91.255},"karana":{"half_tithi_index":15,"name":"Bava"},"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":12,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444706.770833,"ahargana":1856241.2708,"kali_year":5082,"ayanamsa_lahiri":23.5915,"grahas":{"sun":{"sidereal_longitude":358.463181,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":4},"retrograde":false},"moon":{"sidereal_longitude":95.45568100000003,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":1},"retrograde":false,"latitude":-1.148},"mars":{"sidereal_longitude":356.636281,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":342.931081,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":3},"retrograde":false},"jupiter":{"sidereal_longitude":159.90768100000003,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":true},"venus":{"sidereal_longitude":359.941581,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":4},"retrograde":false},"saturn":{"sidereal_longitude":161.416381,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":107.4046,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":287.4046,"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":12,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444706.770833,"kali_year":5082,"ahargana":1856241.2708,"sun":{"sidereal_longitude":358.6453,"rashi":12,"rashi_name":"Mīna"},"moon":{"sidereal_longitude":92.6097,"rashi":4,"rashi_name":"Karka"},"tithi":{"number":8,"name":"Aṣṭamī","paksha":"Śukla","full_name":"Śukla Aṣṭamī","elongation_degrees":93.9644,"elapsed_within_tithi_degrees":9.9644},"nakshatra":{"number":7,"name":"Punarvasu","pada":4,"moon_longitude":92.6097,"elapsed_within_degrees":12.6097},"yoga":{"number":7,"name":"Sukarma","sum_longitude":91.255},"karana":{"half_tithi_index":15,"name":"Bava"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-1.148,"elongation":93.964},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-1.148,"opposition_distance":86.036}},"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":"06:02","sunsetLocal":"18:56","solarNoonLocal":"12:29","dayLengthHours":12.898915245730011,"dayLengthDisplay":"12 Hours 53 Mins 56 Secs","nightLengthDisplay":"11 Hours 06 Mins 04 Secs","moonriseLocal":"11:58","moonsetLocal":"01:57","rahuKala":{"name":"Rāhu Kāla","start":"17:20","end":"18:56","startHours":17.32608490314111,"endHours":18.938449308857358,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"12:29","end":"14:06","startHours":12.488991685992353,"endHours":14.101356091708604,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"15:43","end":"17:20","startHours":15.713720497424855,"endHours":17.32608490314111,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:03","end":"09:29","startHours":9.049280953797682,"endHours":9.479244795322016,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:35","end":"06:55","startHours":6.576988865032764,"endHours":6.92095993825223,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:04","end":"12:55","startHours":12.05902784446802,"endHours":12.918955527516687,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:19","end":"05:11","startHours":4.319678697030012,"endHours":5.179606380078679,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:58","end":"06:02","startHours":4.9646244593165125,"endHours":6.039534063127347,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:38","end":"15:30","startHours":14.638810893614021,"endHours":15.498738576662689,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:44","end":"19:08","startHours":18.73844930885736,"endHours":19.138449308857357,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:56","end":"19:29","startHours":18.938449308857358,"endHours":19.475904110762777,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:41","end":"20:26","startHours":18.688449308857358,"endHours":20.438449308857358,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:04","end":"00:55","startHours":24.05902784446802,"endHours":24.918955527516687,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Udveg","start":"06:02","end":"07:39","startHours":6.039534063127347,"endHours":7.651898468843598,"quality":"inauspicious"},{"name":"Chala","start":"07:39","end":"09:16","startHours":7.651898468843598,"endHours":9.264262874559849,"quality":"neutral"},{"name":"Labha","start":"09:16","end":"10:53","startHours":9.264262874559849,"endHours":10.8766272802761,"quality":"auspicious"},{"name":"Amṛta","start":"10:53","end":"12:29","startHours":10.8766272802761,"endHours":12.488991685992353,"quality":"auspicious"},{"name":"Kāla","start":"12:29","end":"14:06","startHours":12.488991685992353,"endHours":14.101356091708604,"quality":"inauspicious"},{"name":"Śubha","start":"14:06","end":"15:43","startHours":14.101356091708604,"endHours":15.713720497424855,"quality":"auspicious"},{"name":"Roga","start":"15:43","end":"17:20","startHours":15.713720497424855,"endHours":17.32608490314111,"quality":"inauspicious"},{"name":"Udveg","start":"17:20","end":"18:56","startHours":17.32608490314111,"endHours":18.938449308857358,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Śubha","start":"18:56","end":"20:20","startHours":18.938449308857358,"endHours":20.326084903141105,"quality":"auspicious"},{"name":"Roga","start":"20:20","end":"21:43","startHours":20.326084903141105,"endHours":21.713720497424855,"quality":"inauspicious"},{"name":"Udveg","start":"21:43","end":"23:06","startHours":21.713720497424855,"endHours":23.101356091708602,"quality":"inauspicious"},{"name":"Chala","start":"23:06","end":"00:29","startHours":23.101356091708602,"endHours":24.488991685992353,"quality":"neutral"},{"name":"Labha","start":"00:29","end":"01:53","startHours":24.488991685992353,"endHours":25.8766272802761,"quality":"auspicious"},{"name":"Amṛta","start":"01:53","end":"03:16","startHours":25.8766272802761,"endHours":27.264262874559847,"quality":"auspicious"},{"name":"Kāla","start":"03:16","end":"04:39","startHours":27.264262874559847,"endHours":28.651898468843598,"quality":"inauspicious"},{"name":"Śubha","start":"04:39","end":"06:02","startHours":28.651898468843598,"endHours":30.03953406312735,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"06:02","end":"07:02","startHours":6.039534063127347,"endHours":7.039534063127347,"planetary_lord":"Sun"},{"name":"Hora 2","start":"07:02","end":"08:02","startHours":7.039534063127347,"endHours":8.039534063127347,"planetary_lord":"Mars"},{"name":"Hora 3","start":"08:02","end":"09:02","startHours":8.039534063127347,"endHours":9.039534063127347,"planetary_lord":"Jupiter"},{"name":"Hora 4","start":"09:02","end":"10:02","startHours":9.039534063127347,"endHours":10.039534063127347,"planetary_lord":"Saturn"},{"name":"Hora 5","start":"10:02","end":"11:02","startHours":10.039534063127347,"endHours":11.039534063127347,"planetary_lord":"Moon"},{"name":"Hora 6","start":"11:02","end":"12:02","startHours":11.039534063127347,"endHours":12.039534063127347,"planetary_lord":"Mercury"},{"name":"Hora 7","start":"12:02","end":"13:02","startHours":12.039534063127347,"endHours":13.039534063127347,"planetary_lord":"Venus"},{"name":"Hora 8","start":"13:02","end":"14:02","startHours":13.039534063127347,"endHours":14.039534063127347,"planetary_lord":"Sun"},{"name":"Hora 9","start":"14:02","end":"15:02","startHours":14.039534063127347,"endHours":15.039534063127347,"planetary_lord":"Mars"},{"name":"Hora 10","start":"15:02","end":"16:02","startHours":15.039534063127347,"endHours":16.03953406312735,"planetary_lord":"Jupiter"},{"name":"Hora 11","start":"16:02","end":"17:02","startHours":16.03953406312735,"endHours":17.03953406312735,"planetary_lord":"Saturn"},{"name":"Hora 12","start":"17:02","end":"18:02","startHours":17.03953406312735,"endHours":18.03953406312735,"planetary_lord":"Moon"},{"name":"Hora 13","start":"18:02","end":"19:02","startHours":18.03953406312735,"endHours":19.03953406312735,"planetary_lord":"Mercury"},{"name":"Hora 14","start":"19:02","end":"20:02","startHours":19.03953406312735,"endHours":20.03953406312735,"planetary_lord":"Venus"},{"name":"Hora 15","start":"20:02","end":"21:02","startHours":20.03953406312735,"endHours":21.03953406312735,"planetary_lord":"Sun"},{"name":"Hora 16","start":"21:02","end":"22:02","startHours":21.03953406312735,"endHours":22.03953406312735,"planetary_lord":"Mars"},{"name":"Hora 17","start":"22:02","end":"23:02","startHours":22.03953406312735,"endHours":23.03953406312735,"planetary_lord":"Jupiter"},{"name":"Hora 18","start":"23:02","end":"00:02","startHours":23.03953406312735,"endHours":24.03953406312735,"planetary_lord":"Saturn"},{"name":"Hora 19","start":"00:02","end":"01:02","startHours":24.03953406312735,"endHours":25.03953406312735,"planetary_lord":"Moon"},{"name":"Hora 20","start":"01:02","end":"02:02","startHours":25.03953406312735,"endHours":26.03953406312735,"planetary_lord":"Mercury"},{"name":"Hora 21","start":"02:02","end":"03:02","startHours":26.03953406312735,"endHours":27.03953406312735,"planetary_lord":"Venus"},{"name":"Hora 22","start":"03:02","end":"04:02","startHours":27.03953406312735,"endHours":28.03953406312735,"planetary_lord":"Sun"},{"name":"Hora 23","start":"04:02","end":"05:02","startHours":28.03953406312735,"endHours":29.03953406312735,"planetary_lord":"Mars"},{"name":"Hora 24","start":"05:02","end":"06:02","startHours":29.03953406312735,"endHours":30.03953406312735,"planetary_lord":"Jupiter"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Puṣya","Aśleṣā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Rohiṇī","Mṛgaśirā","Ārdrā","Punarvasu","Hasta","Citrā","Svātī","Viśākhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Meṣa","Vṛṣabha","Karka","Kanyā","Dhanu","Makara"],"unfavorable_rashis":["Mithuna","Siṃha","Tulā","Vṛścika","Kumbha","Mīna"]},"dishaShool":"West (Paścim)","chandraVasa":"South-West","rahuVasa":"North-East","anandadiYoga":{"name":"Dhvaja","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":8.588974681279051,"eotMinutes":-1.043501159541278,"ayanamsa":23.5915}},"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 Aṣṭamī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[],"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":[{"historical_date":"-3137-12-25","event":"Bhīṣma's Mahaprasthan","chart_id":"bhishma","shared_marker":"same Śukla Aṣṭamī","url":"/day/-3137-12-25","relevance":0.5},{"historical_date":"-1626101-04-03","event":"Bhagavān Rāma's birth at Ayodhyā","chart_id":"rama","shared_marker":"same Punarvasu","url":"/day/-1626101-04-03","relevance":0.5}]},"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 12, 1981 CE · Phoenix, USA · Vidhyamitra","description":"April 12, 1981 CE for Phoenix, USA: Śukla Aṣṭamī, sūryodaya 06:02, sūryāsta 18:56.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/phoenix/1981-04-12","hreflang_alternates":{"en":"https://vidhyamitra.com/city/phoenix/1981-04-12","sa":"https://sa.vidhyamitra.com/city/phoenix/1981-04-12","hi":"https://hi.vidhyamitra.com/city/phoenix/1981-04-12","x-default":"https://vidhyamitra.com/city/phoenix/1981-04-12"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-30T23:06:07.963Z","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":"2026-05-30T23:06:07.963Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-30T23:06:07.963Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}