{"id":"vidhyamitra:city-day:phoenix:1981-01-12:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/phoenix/1981-01-12","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-01-12","date_display":"January 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":1,"day":12,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444616.770833,"kali_year":5082,"ahargana":1856151.2708,"sun":{"sidereal_longitude":268.0751,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":340.2558,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":7,"name":"Saptamī","paksha":"Śukla","full_name":"Śukla Saptamī","elongation_degrees":72.1807,"elapsed_within_tithi_degrees":0.1807},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":3,"moon_longitude":340.2558,"elapsed_within_degrees":6.9225},"yoga":{"number":19,"name":"Parigha","sum_longitude":248.331},"karana":{"half_tithi_index":12,"name":"Gara"},"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":1,"day":12,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444616.770833,"ahargana":1856151.2708,"kali_year":5082,"ayanamsa_lahiri":23.588,"grahas":{"sun":{"sidereal_longitude":268.16562,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":1},"retrograde":false},"moon":{"sidereal_longitude":340.03122,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":3},"retrograde":false,"latitude":-3.347},"mars":{"sidereal_longitude":286.24882,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":2},"retrograde":false},"mercury":{"sidereal_longitude":275.69772,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":3},"retrograde":false},"jupiter":{"sidereal_longitude":166.59011999999996,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":false},"venus":{"sidereal_longitude":247.63102000000003,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":165.91992000000005,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":false},"rahu":{"sidereal_longitude":112.1732,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":292.1732,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":4},"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":1,"day":12,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444616.770833,"kali_year":5082,"ahargana":1856151.2708,"sun":{"sidereal_longitude":268.0751,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":340.2558,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":7,"name":"Saptamī","paksha":"Śukla","full_name":"Śukla Saptamī","elongation_degrees":72.1807,"elapsed_within_tithi_degrees":0.1807},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":3,"moon_longitude":340.2558,"elapsed_within_degrees":6.9225},"yoga":{"number":19,"name":"Parigha","sum_longitude":248.331},"karana":{"half_tithi_index":12,"name":"Gara"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-3.347,"elongation":72.181},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-3.347,"opposition_distance":107.819}},"eclipse_window_40days":[{"offset_days":8,"type":"lunar","occurs":true,"moon_latitude":-1.332,"opposition_distance":1.776}]},"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":"07:33","sunsetLocal":"17:40","solarNoonLocal":"12:37","dayLengthHours":10.11812880081257,"dayLengthDisplay":"10 Hours 07 Mins 05 Secs","nightLengthDisplay":"13 Hours 52 Mins 55 Secs","moonriseLocal":"11:17","moonsetLocal":"23:31","rahuKala":{"name":"Rāhu Kāla","start":"08:49","end":"10:05","startHours":8.815059743634915,"endHours":10.079825843736486,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"11:21","end":"12:37","startHours":11.344591943838058,"endHours":12.60935804393963,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"13:52","end":"15:08","startHours":13.8741241440412,"endHours":15.138890244142772,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:55","end":"10:15","startHours":9.911190363722943,"endHours":10.248461323750028,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:58","end":"08:15","startHours":7.9718823435672,"endHours":8.241699111588868,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:16","end":"12:57","startHours":12.272087083912544,"endHours":12.946629003966715,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"06:12","end":"06:53","startHours":6.201209803425,"endHours":6.875751723479172,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"06:42","end":"07:33","startHours":6.707116243465629,"endHours":7.550293643533343,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:18","end":"14:58","startHours":14.295712844075055,"endHours":14.970254764129226,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:28","end":"17:52","startHours":17.468422444345915,"endHours":17.868422444345914,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:40","end":"18:05","startHours":17.668422444345914,"endHours":18.090011144379773,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:25","end":"19:10","startHours":17.418422444345914,"endHours":19.168422444345914,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:16","end":"00:57","startHours":24.27208708391254,"endHours":24.946629003966716,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Amṛta","start":"07:33","end":"08:49","startHours":7.550293643533343,"endHours":8.815059743634915,"quality":"auspicious"},{"name":"Kāla","start":"08:49","end":"10:05","startHours":8.815059743634915,"endHours":10.079825843736486,"quality":"inauspicious"},{"name":"Śubha","start":"10:05","end":"11:21","startHours":10.079825843736486,"endHours":11.344591943838058,"quality":"auspicious"},{"name":"Roga","start":"11:21","end":"12:37","startHours":11.344591943838058,"endHours":12.60935804393963,"quality":"inauspicious"},{"name":"Udveg","start":"12:37","end":"13:52","startHours":12.60935804393963,"endHours":13.8741241440412,"quality":"inauspicious"},{"name":"Chala","start":"13:52","end":"15:08","startHours":13.8741241440412,"endHours":15.138890244142772,"quality":"neutral"},{"name":"Labha","start":"15:08","end":"16:24","startHours":15.138890244142772,"endHours":16.403656344244343,"quality":"auspicious"},{"name":"Amṛta","start":"16:24","end":"17:40","startHours":16.403656344244343,"endHours":17.668422444345914,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Chala","start":"17:40","end":"19:24","startHours":17.668422444345914,"endHours":19.403656344244343,"quality":"neutral"},{"name":"Labha","start":"19:24","end":"21:08","startHours":19.403656344244343,"endHours":21.13889024414277,"quality":"auspicious"},{"name":"Amṛta","start":"21:08","end":"22:52","startHours":21.13889024414277,"endHours":22.8741241440412,"quality":"auspicious"},{"name":"Kāla","start":"22:52","end":"00:37","startHours":22.8741241440412,"endHours":24.60935804393963,"quality":"inauspicious"},{"name":"Śubha","start":"00:37","end":"02:21","startHours":24.60935804393963,"endHours":26.344591943838058,"quality":"auspicious"},{"name":"Roga","start":"02:21","end":"04:05","startHours":26.344591943838058,"endHours":28.079825843736486,"quality":"inauspicious"},{"name":"Udveg","start":"04:05","end":"05:49","startHours":28.079825843736486,"endHours":29.815059743634915,"quality":"inauspicious"},{"name":"Chala","start":"05:49","end":"07:33","startHours":29.815059743634915,"endHours":31.550293643533344,"quality":"neutral"}],"horas":[{"name":"Hora 1","start":"07:33","end":"08:33","startHours":7.550293643533343,"endHours":8.550293643533344,"planetary_lord":"Moon"},{"name":"Hora 2","start":"08:33","end":"09:33","startHours":8.550293643533344,"endHours":9.550293643533344,"planetary_lord":"Mercury"},{"name":"Hora 3","start":"09:33","end":"10:33","startHours":9.550293643533344,"endHours":10.550293643533344,"planetary_lord":"Venus"},{"name":"Hora 4","start":"10:33","end":"11:33","startHours":10.550293643533344,"endHours":11.550293643533344,"planetary_lord":"Sun"},{"name":"Hora 5","start":"11:33","end":"12:33","startHours":11.550293643533344,"endHours":12.550293643533344,"planetary_lord":"Mars"},{"name":"Hora 6","start":"12:33","end":"13:33","startHours":12.550293643533344,"endHours":13.550293643533344,"planetary_lord":"Jupiter"},{"name":"Hora 7","start":"13:33","end":"14:33","startHours":13.550293643533344,"endHours":14.550293643533344,"planetary_lord":"Saturn"},{"name":"Hora 8","start":"14:33","end":"15:33","startHours":14.550293643533344,"endHours":15.550293643533344,"planetary_lord":"Moon"},{"name":"Hora 9","start":"15:33","end":"16:33","startHours":15.550293643533344,"endHours":16.550293643533344,"planetary_lord":"Mercury"},{"name":"Hora 10","start":"16:33","end":"17:33","startHours":16.550293643533344,"endHours":17.550293643533344,"planetary_lord":"Venus"},{"name":"Hora 11","start":"17:33","end":"18:33","startHours":17.550293643533344,"endHours":18.550293643533344,"planetary_lord":"Sun"},{"name":"Hora 12","start":"18:33","end":"19:33","startHours":18.550293643533344,"endHours":19.550293643533344,"planetary_lord":"Mars"},{"name":"Hora 13","start":"19:33","end":"20:33","startHours":19.550293643533344,"endHours":20.550293643533344,"planetary_lord":"Jupiter"},{"name":"Hora 14","start":"20:33","end":"21:33","startHours":20.550293643533344,"endHours":21.550293643533344,"planetary_lord":"Saturn"},{"name":"Hora 15","start":"21:33","end":"22:33","startHours":21.550293643533344,"endHours":22.550293643533344,"planetary_lord":"Moon"},{"name":"Hora 16","start":"22:33","end":"23:33","startHours":22.550293643533344,"endHours":23.550293643533344,"planetary_lord":"Mercury"},{"name":"Hora 17","start":"23:33","end":"00:33","startHours":23.550293643533344,"endHours":24.550293643533344,"planetary_lord":"Venus"},{"name":"Hora 18","start":"00:33","end":"01:33","startHours":24.550293643533344,"endHours":25.550293643533344,"planetary_lord":"Sun"},{"name":"Hora 19","start":"01:33","end":"02:33","startHours":25.550293643533344,"endHours":26.550293643533344,"planetary_lord":"Mars"},{"name":"Hora 20","start":"02:33","end":"03:33","startHours":26.550293643533344,"endHours":27.550293643533344,"planetary_lord":"Jupiter"},{"name":"Hora 21","start":"03:33","end":"04:33","startHours":27.550293643533344,"endHours":28.550293643533344,"planetary_lord":"Saturn"},{"name":"Hora 22","start":"04:33","end":"05:33","startHours":28.550293643533344,"endHours":29.550293643533344,"planetary_lord":"Moon"},{"name":"Hora 23","start":"05:33","end":"06:33","startHours":29.550293643533344,"endHours":30.550293643533344,"planetary_lord":"Mercury"},{"name":"Hora 24","start":"06:33","end":"07:33","startHours":30.550293643533344,"endHours":31.550293643533344,"planetary_lord":"Venus"}],"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":"East (Pūrva)","chandraVasa":"South-West","rahuVasa":"North-East","anandadiYoga":{"name":"Kāladaṇḍa","quality":"Inauspicious"},"drikRitu":"Hemanta (Pre-winter) (Drik)","vedicRitu":"Hemanta (Pre-winter)","drikAyana":"Uttarāyaṇa","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":-21.679136220686505,"eotMinutes":-8.265482636377905,"ayanamsa":23.588}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Pauṣa","lunar_month_paksha_full":"Pauṣa Śukla Pakṣa","solar_month":"Dhanus (Mārgaḻi)","ritu":"Hemanta (Pre-winter)","display_summary":"Pauṣa Śukla Saptamī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"lohri","name":"Lohri","name_sanskrit":"लोहड़ी","tradition":"Regional","significance":"Punjab harvest festival; eve of Makara Saṅkrānti. (Approximated as 13/14 January annually; correct via Sun in Dhanu/Makara cusp.)","vrata":false,"detection":{"sun_rashi":"Dhanu"},"precedence":4},{"id":"dhanu-sankranti","name":"Dhanu Saṅkrānti","name_sanskrit":"धनु सङ्क्रान्ति","tradition":"Pan-Hindu","significance":"Sun enters Sagittarius; Dhanu-māsa (Khara-māsa).","vrata":false,"detection":{"sun_rashi":"Dhanu"},"precedence":5}],"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":[]},"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 January 12, 1981 CE · Phoenix, USA · Vidhyamitra","description":"January 12, 1981 CE for Phoenix, USA: Śukla Saptamī, sūryodaya 07:33, sūryāsta 17:40.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/phoenix/1981-01-12","hreflang_alternates":{"en":"https://vidhyamitra.com/city/phoenix/1981-01-12","sa":"https://sa.vidhyamitra.com/city/phoenix/1981-01-12","hi":"https://hi.vidhyamitra.com/city/phoenix/1981-01-12","x-default":"https://vidhyamitra.com/city/phoenix/1981-01-12"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-18T12:39:56.699Z","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":"2026-05-18T12:39:56.699Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-18T12:39:56.699Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}