{"id":"vidhyamitra:city-day:phoenix:1981-04-10:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/phoenix/1981-04-10","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-04-10","date_display":"April 10, 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":10,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444704.770833,"kali_year":5082,"ahargana":1856239.2708,"sun":{"sidereal_longitude":356.6891,"rashi":12,"rashi_name":"Mīna"},"moon":{"sidereal_longitude":65.2264,"rashi":3,"rashi_name":"Mithuna"},"tithi":{"number":6,"name":"Ṣaṣṭhī","paksha":"Śukla","full_name":"Śukla Ṣaṣṭhī","elongation_degrees":68.5373,"elapsed_within_tithi_degrees":8.5373},"nakshatra":{"number":5,"name":"Mṛgaśīrṣā","pada":4,"moon_longitude":65.2264,"elapsed_within_degrees":11.893},"yoga":{"number":5,"name":"Śobhana","sum_longitude":61.9154},"karana":{"half_tithi_index":11,"name":"Taitila"},"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":4,"day":10,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444704.770833,"ahargana":1856239.2708,"kali_year":5082,"ayanamsa_lahiri":23.5914,"grahas":{"sun":{"sidereal_longitude":356.500757,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":3},"retrograde":false},"moon":{"sidereal_longitude":68.42785700000002,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":6,"name":"Ārdrā","pada":1},"retrograde":false,"latitude":-3.0259},"mars":{"sidereal_longitude":355.113257,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":339.426257,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":2},"retrograde":false},"jupiter":{"sidereal_longitude":160.14155700000003,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":1},"retrograde":true},"venus":{"sidereal_longitude":357.465357,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":4},"retrograde":false},"saturn":{"sidereal_longitude":161.56435699999997,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":107.5106,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":287.5106,"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":10,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444704.770833,"kali_year":5082,"ahargana":1856239.2708,"sun":{"sidereal_longitude":356.6891,"rashi":12,"rashi_name":"Mīna"},"moon":{"sidereal_longitude":65.2264,"rashi":3,"rashi_name":"Mithuna"},"tithi":{"number":6,"name":"Ṣaṣṭhī","paksha":"Śukla","full_name":"Śukla Ṣaṣṭhī","elongation_degrees":68.5373,"elapsed_within_tithi_degrees":8.5373},"nakshatra":{"number":5,"name":"Mṛgaśīrṣā","pada":4,"moon_longitude":65.2264,"elapsed_within_degrees":11.893},"yoga":{"number":5,"name":"Śobhana","sum_longitude":61.9154},"karana":{"half_tithi_index":11,"name":"Taitila"},"vara":{"number":0,"name":"Śukravāra (Friday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-3.026,"elongation":68.537},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-3.026,"opposition_distance":111.463}},"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":"06:05","sunsetLocal":"18:55","solarNoonLocal":"12:30","dayLengthHours":12.832066894449767,"dayLengthDisplay":"12 Hours 49 Mins 55 Secs","nightLengthDisplay":"11 Hours 10 Mins 05 Secs","moonriseLocal":"10:08","moonsetLocal":"00:27","rahuKala":{"name":"Rāhu Kāla","start":"10:54","end":"12:30","startHours":10.894375897613195,"endHours":12.498384259419417,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"15:42","end":"17:19","startHours":15.706400983031859,"endHours":17.310409344838078,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"07:41","end":"09:17","startHours":7.686359174000754,"endHours":9.290367535806975,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:05","end":"09:30","startHours":9.076499754232811,"endHours":9.504235317381138,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:37","end":"06:58","startHours":6.6170202661299395,"endHours":6.9592087166486,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:04","end":"12:56","startHours":12.07064869627109,"endHours":12.926119822567744,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:22","end":"05:14","startHours":4.371408559601231,"endHours":5.226879685897882,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:01","end":"06:05","startHours":5.013011904323719,"endHours":6.082350812194533,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:38","end":"15:30","startHours":14.637062075161044,"endHours":15.492533201457695,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:43","end":"19:07","startHours":18.7144177066443,"endHours":19.1144177066443,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:55","end":"19:27","startHours":18.9144177066443,"endHours":19.449087160579708,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:40","end":"20:25","startHours":18.6644177066443,"endHours":20.4144177066443,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:04","end":"00:56","startHours":24.070648696271093,"endHours":24.926119822567742,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Chala","start":"06:05","end":"07:41","startHours":6.082350812194533,"endHours":7.686359174000754,"quality":"neutral"},{"name":"Labha","start":"07:41","end":"09:17","startHours":7.686359174000754,"endHours":9.290367535806975,"quality":"auspicious"},{"name":"Amṛta","start":"09:17","end":"10:54","startHours":9.290367535806975,"endHours":10.894375897613195,"quality":"auspicious"},{"name":"Kāla","start":"10:54","end":"12:30","startHours":10.894375897613195,"endHours":12.498384259419417,"quality":"inauspicious"},{"name":"Śubha","start":"12:30","end":"14:06","startHours":12.498384259419417,"endHours":14.102392621225636,"quality":"auspicious"},{"name":"Roga","start":"14:06","end":"15:42","startHours":14.102392621225636,"endHours":15.706400983031859,"quality":"inauspicious"},{"name":"Udveg","start":"15:42","end":"17:19","startHours":15.706400983031859,"endHours":17.310409344838078,"quality":"inauspicious"},{"name":"Chala","start":"17:19","end":"18:55","startHours":17.310409344838078,"endHours":18.9144177066443,"quality":"neutral"}],"nightChoghadiyas":[{"name":"Roga","start":"18:55","end":"20:19","startHours":18.9144177066443,"endHours":20.310409344838078,"quality":"inauspicious"},{"name":"Udveg","start":"20:19","end":"21:42","startHours":20.310409344838078,"endHours":21.70640098303186,"quality":"inauspicious"},{"name":"Chala","start":"21:42","end":"23:06","startHours":21.70640098303186,"endHours":23.10239262122564,"quality":"neutral"},{"name":"Labha","start":"23:06","end":"00:30","startHours":23.10239262122564,"endHours":24.498384259419417,"quality":"auspicious"},{"name":"Amṛta","start":"00:30","end":"01:54","startHours":24.498384259419417,"endHours":25.894375897613195,"quality":"auspicious"},{"name":"Kāla","start":"01:54","end":"03:17","startHours":25.894375897613195,"endHours":27.290367535806975,"quality":"inauspicious"},{"name":"Śubha","start":"03:17","end":"04:41","startHours":27.290367535806975,"endHours":28.686359174000756,"quality":"auspicious"},{"name":"Roga","start":"04:41","end":"06:05","startHours":28.686359174000756,"endHours":30.082350812194534,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"06:05","end":"07:05","startHours":6.082350812194533,"endHours":7.082350812194533,"planetary_lord":"Venus"},{"name":"Hora 2","start":"07:05","end":"08:05","startHours":7.082350812194533,"endHours":8.082350812194534,"planetary_lord":"Sun"},{"name":"Hora 3","start":"08:05","end":"09:05","startHours":8.082350812194534,"endHours":9.082350812194534,"planetary_lord":"Mars"},{"name":"Hora 4","start":"09:05","end":"10:05","startHours":9.082350812194534,"endHours":10.082350812194534,"planetary_lord":"Jupiter"},{"name":"Hora 5","start":"10:05","end":"11:05","startHours":10.082350812194534,"endHours":11.082350812194534,"planetary_lord":"Saturn"},{"name":"Hora 6","start":"11:05","end":"12:05","startHours":11.082350812194534,"endHours":12.082350812194534,"planetary_lord":"Moon"},{"name":"Hora 7","start":"12:05","end":"13:05","startHours":12.082350812194534,"endHours":13.082350812194534,"planetary_lord":"Mercury"},{"name":"Hora 8","start":"13:05","end":"14:05","startHours":13.082350812194534,"endHours":14.082350812194534,"planetary_lord":"Venus"},{"name":"Hora 9","start":"14:05","end":"15:05","startHours":14.082350812194534,"endHours":15.082350812194534,"planetary_lord":"Sun"},{"name":"Hora 10","start":"15:05","end":"16:05","startHours":15.082350812194534,"endHours":16.082350812194534,"planetary_lord":"Mars"},{"name":"Hora 11","start":"16:05","end":"17:05","startHours":16.082350812194534,"endHours":17.082350812194534,"planetary_lord":"Jupiter"},{"name":"Hora 12","start":"17:05","end":"18:05","startHours":17.082350812194534,"endHours":18.082350812194534,"planetary_lord":"Saturn"},{"name":"Hora 13","start":"18:05","end":"19:05","startHours":18.082350812194534,"endHours":19.082350812194534,"planetary_lord":"Moon"},{"name":"Hora 14","start":"19:05","end":"20:05","startHours":19.082350812194534,"endHours":20.082350812194534,"planetary_lord":"Mercury"},{"name":"Hora 15","start":"20:05","end":"21:05","startHours":20.082350812194534,"endHours":21.082350812194534,"planetary_lord":"Venus"},{"name":"Hora 16","start":"21:05","end":"22:05","startHours":21.082350812194534,"endHours":22.082350812194534,"planetary_lord":"Sun"},{"name":"Hora 17","start":"22:05","end":"23:05","startHours":22.082350812194534,"endHours":23.082350812194534,"planetary_lord":"Mars"},{"name":"Hora 18","start":"23:05","end":"00:05","startHours":23.082350812194534,"endHours":24.082350812194534,"planetary_lord":"Jupiter"},{"name":"Hora 19","start":"00:05","end":"01:05","startHours":24.082350812194534,"endHours":25.082350812194534,"planetary_lord":"Saturn"},{"name":"Hora 20","start":"01:05","end":"02:05","startHours":25.082350812194534,"endHours":26.082350812194534,"planetary_lord":"Moon"},{"name":"Hora 21","start":"02:05","end":"03:05","startHours":26.082350812194534,"endHours":27.082350812194534,"planetary_lord":"Mercury"},{"name":"Hora 22","start":"03:05","end":"04:05","startHours":27.082350812194534,"endHours":28.082350812194534,"planetary_lord":"Venus"},{"name":"Hora 23","start":"04:05","end":"05:05","startHours":28.082350812194534,"endHours":29.082350812194534,"planetary_lord":"Sun"},{"name":"Hora 24","start":"05:05","end":"06:05","startHours":29.082350812194534,"endHours":30.082350812194534,"planetary_lord":"Mars"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Ārdrā","Punarvasu","Puṣya","Aśleṣā","Maghā","Svātī","Viśākhā","Anurādhā","Jyeṣṭhā","Mūla","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Bharaṇī","Kṛttikā","Rohiṇī","Mṛgaśirā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Citrā","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Meṣa","Mithuna","Siṃha","Vṛścika","Dhanu","Mīna"],"unfavorable_rashis":["Vṛṣabha","Karka","Kanyā","Tulā","Makara","Kumbha"]},"dishaShool":"West (Paścim)","chandraVasa":"South","rahuVasa":"South-East","anandadiYoga":{"name":"Rākṣasa","quality":"Inauspicious"},"drikRitu":"Vasanta (Spring) (Drik)","vedicRitu":"Śiśira (Winter)","drikAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":7.853087131186853,"eotMinutes":-1.6070555651651,"ayanamsa":23.5914}},"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","solar_month":"Mīna (Paṅkuṇi)","ritu":"Vasanta (Spring)","display_summary":"Caitra Śukla Ṣaṣṭhī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"yamuna-jayanti","name":"Yamunā Jayantī","name_sanskrit":"यमुना जयन्ती","tradition":"Vaishnava","associated_deity":"Yamunā Devī (Krishna's playmate)","significance":"Manifestation of Yamunā Devī; Vraja-bhakti-pravāhinī.","vrata":true,"detection":{"tithi_number":6,"tithi_paksha":"Śukla","lunar_month":"Caitra"},"precedence":4},{"id":"mina-sankranti","name":"Mīna Saṅkrānti","name_sanskrit":"मीन सङ्क्रान्ति","tradition":"Pan-Hindu","significance":"Sun enters Pisces; Mīna-māsa begins.","vrata":false,"detection":{"sun_rashi":"Mīna"},"precedence":5}],"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 April 10, 1981 CE · Phoenix, USA · Vidhyamitra","description":"April 10, 1981 CE for Phoenix, USA: Śukla Ṣaṣṭhī, sūryodaya 06:05, sūryāsta 18:55.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/phoenix/1981-04-10","hreflang_alternates":{"en":"https://vidhyamitra.com/city/phoenix/1981-04-10","sa":"https://sa.vidhyamitra.com/city/phoenix/1981-04-10","hi":"https://hi.vidhyamitra.com/city/phoenix/1981-04-10","x-default":"https://vidhyamitra.com/city/phoenix/1981-04-10"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-24T22:22:54.438Z","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":"2026-05-24T22:22:54.438Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-24T22:22:54.438Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}