{"id":"vidhyamitra:city-day:seattle:1981-04-13:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/seattle/1981-04-13","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-04-13","date_display":"April 13, 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":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444707.770833,"kali_year":5082,"ahargana":1856242.2708,"sun":{"sidereal_longitude":359.6224,"rashi":12,"rashi_name":"Mīna"},"moon":{"sidereal_longitude":105.945,"rashi":4,"rashi_name":"Karka"},"tithi":{"number":9,"name":"Navamī","paksha":"Śukla","full_name":"Śukla Navamī","elongation_degrees":106.3226,"elapsed_within_tithi_degrees":10.3226},"nakshatra":{"number":8,"name":"Puṣya","pada":4,"moon_longitude":105.945,"elapsed_within_degrees":12.6117},"yoga":{"number":8,"name":"Dhṛti","sum_longitude":105.5674},"karana":{"half_tithi_index":17,"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":13,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444707.770833,"ahargana":1856242.2708,"kali_year":5082,"ayanamsa_lahiri":23.5915,"grahas":{"sun":{"sidereal_longitude":359.443543,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":4},"retrograde":false},"moon":{"sidereal_longitude":108.42974299999997,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Aśleṣā","pada":1},"retrograde":false,"latitude":-0.1103},"mars":{"sidereal_longitude":357.396643,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":344.722343,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":159.79284299999995,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":true},"venus":{"sidereal_longitude":1.1791430000000105,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":1},"retrograde":false},"saturn":{"sidereal_longitude":161.343343,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":107.3516,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":287.3516,"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":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444707.770833,"kali_year":5082,"ahargana":1856242.2708,"sun":{"sidereal_longitude":359.6224,"rashi":12,"rashi_name":"Mīna"},"moon":{"sidereal_longitude":105.945,"rashi":4,"rashi_name":"Karka"},"tithi":{"number":9,"name":"Navamī","paksha":"Śukla","full_name":"Śukla Navamī","elongation_degrees":106.3226,"elapsed_within_tithi_degrees":10.3226},"nakshatra":{"number":8,"name":"Puṣya","pada":4,"moon_longitude":105.945,"elapsed_within_degrees":12.6117},"yoga":{"number":8,"name":"Dhṛti","sum_longitude":105.5674},"karana":{"half_tithi_index":17,"name":"Kaulava"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-0.11,"elongation":106.323},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-0.11,"opposition_distance":73.677}},"eclipse_window_40days":[]},"city":{"slug":"seattle","name":"Seattle, USA","lat":47.6062,"lon":-122.3321,"tz_offset_hours":-8,"country":"US","tier":"diaspora"},"tier2":{"city":{"slug":"seattle","name":"Seattle, USA","lat":47.6062,"lon":-122.3321,"tz_offset_hours":-8,"country":"US","tier":"diaspora"},"sunriseLocal":"05:25","sunsetLocal":"18:55","solarNoonLocal":"12:10","dayLengthHours":13.494666332419705,"dayLengthDisplay":"13 Hours 29 Mins 41 Secs","nightLengthDisplay":"10 Hours 30 Mins 19 Secs","moonriseLocal":"12:03","moonsetLocal":"02:49","rahuKala":{"name":"Rāhu Kāla","start":"07:06","end":"08:48","startHours":7.107803639171016,"endHours":8.79463693072348,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"10:29","end":"12:10","startHours":10.481470222275941,"endHours":12.168303513828405,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"13:51","end":"15:33","startHours":13.85513680538087,"endHours":15.541970096933332,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:34","end":"09:01","startHours":8.569725825183152,"endHours":9.019548036263808,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"05:59","end":"06:21","startHours":5.983248111469374,"endHours":6.3431058803338995,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:43","end":"12:37","startHours":11.71848130274775,"endHours":12.618125724909062,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:37","end":"04:31","startHours":3.6216815032959255,"endHours":4.52132592545724,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:18","end":"05:25","startHours":4.296414819916911,"endHours":5.420970347618553,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:25","end":"15:19","startHours":14.41741456923169,"endHours":15.317058991393004,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:43","end":"19:07","startHours":18.71563668003826,"endHours":19.115636680038257,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:55","end":"19:29","startHours":18.915636680038258,"endHours":19.47791444388908,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:40","end":"20:25","startHours":18.665636680038258,"endHours":20.415636680038258,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:43","end":"00:37","startHours":23.718481302747747,"endHours":24.618125724909063,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Amṛta","start":"05:25","end":"07:06","startHours":5.420970347618553,"endHours":7.107803639171016,"quality":"auspicious"},{"name":"Kāla","start":"07:06","end":"08:48","startHours":7.107803639171016,"endHours":8.79463693072348,"quality":"inauspicious"},{"name":"Śubha","start":"08:48","end":"10:29","startHours":8.79463693072348,"endHours":10.481470222275941,"quality":"auspicious"},{"name":"Roga","start":"10:29","end":"12:10","startHours":10.481470222275941,"endHours":12.168303513828405,"quality":"inauspicious"},{"name":"Udveg","start":"12:10","end":"13:51","startHours":12.168303513828405,"endHours":13.85513680538087,"quality":"inauspicious"},{"name":"Chala","start":"13:51","end":"15:33","startHours":13.85513680538087,"endHours":15.541970096933332,"quality":"neutral"},{"name":"Labha","start":"15:33","end":"17:14","startHours":15.541970096933332,"endHours":17.228803388485794,"quality":"auspicious"},{"name":"Amṛta","start":"17:14","end":"18:55","startHours":17.228803388485794,"endHours":18.915636680038258,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Chala","start":"18:55","end":"20:14","startHours":18.915636680038258,"endHours":20.228803388485794,"quality":"neutral"},{"name":"Labha","start":"20:14","end":"21:33","startHours":20.228803388485794,"endHours":21.541970096933333,"quality":"auspicious"},{"name":"Amṛta","start":"21:33","end":"22:51","startHours":21.541970096933333,"endHours":22.85513680538087,"quality":"auspicious"},{"name":"Kāla","start":"22:51","end":"00:10","startHours":22.85513680538087,"endHours":24.168303513828405,"quality":"inauspicious"},{"name":"Śubha","start":"00:10","end":"01:29","startHours":24.168303513828405,"endHours":25.48147022227594,"quality":"auspicious"},{"name":"Roga","start":"01:29","end":"02:48","startHours":25.48147022227594,"endHours":26.794636930723478,"quality":"inauspicious"},{"name":"Udveg","start":"02:48","end":"04:06","startHours":26.794636930723478,"endHours":28.107803639171017,"quality":"inauspicious"},{"name":"Chala","start":"04:06","end":"05:25","startHours":28.107803639171017,"endHours":29.420970347618553,"quality":"neutral"}],"horas":[{"name":"Hora 1","start":"05:25","end":"06:25","startHours":5.420970347618553,"endHours":6.420970347618553,"planetary_lord":"Moon"},{"name":"Hora 2","start":"06:25","end":"07:25","startHours":6.420970347618553,"endHours":7.420970347618553,"planetary_lord":"Mercury"},{"name":"Hora 3","start":"07:25","end":"08:25","startHours":7.420970347618553,"endHours":8.420970347618553,"planetary_lord":"Venus"},{"name":"Hora 4","start":"08:25","end":"09:25","startHours":8.420970347618553,"endHours":9.420970347618553,"planetary_lord":"Sun"},{"name":"Hora 5","start":"09:25","end":"10:25","startHours":9.420970347618553,"endHours":10.420970347618553,"planetary_lord":"Mars"},{"name":"Hora 6","start":"10:25","end":"11:25","startHours":10.420970347618553,"endHours":11.420970347618553,"planetary_lord":"Jupiter"},{"name":"Hora 7","start":"11:25","end":"12:25","startHours":11.420970347618553,"endHours":12.420970347618553,"planetary_lord":"Saturn"},{"name":"Hora 8","start":"12:25","end":"13:25","startHours":12.420970347618553,"endHours":13.420970347618553,"planetary_lord":"Moon"},{"name":"Hora 9","start":"13:25","end":"14:25","startHours":13.420970347618553,"endHours":14.420970347618553,"planetary_lord":"Mercury"},{"name":"Hora 10","start":"14:25","end":"15:25","startHours":14.420970347618553,"endHours":15.420970347618553,"planetary_lord":"Venus"},{"name":"Hora 11","start":"15:25","end":"16:25","startHours":15.420970347618553,"endHours":16.420970347618553,"planetary_lord":"Sun"},{"name":"Hora 12","start":"16:25","end":"17:25","startHours":16.420970347618553,"endHours":17.420970347618553,"planetary_lord":"Mars"},{"name":"Hora 13","start":"17:25","end":"18:25","startHours":17.420970347618553,"endHours":18.420970347618553,"planetary_lord":"Jupiter"},{"name":"Hora 14","start":"18:25","end":"19:25","startHours":18.420970347618553,"endHours":19.420970347618553,"planetary_lord":"Saturn"},{"name":"Hora 15","start":"19:25","end":"20:25","startHours":19.420970347618553,"endHours":20.420970347618553,"planetary_lord":"Moon"},{"name":"Hora 16","start":"20:25","end":"21:25","startHours":20.420970347618553,"endHours":21.420970347618553,"planetary_lord":"Mercury"},{"name":"Hora 17","start":"21:25","end":"22:25","startHours":21.420970347618553,"endHours":22.420970347618553,"planetary_lord":"Venus"},{"name":"Hora 18","start":"22:25","end":"23:25","startHours":22.420970347618553,"endHours":23.420970347618553,"planetary_lord":"Sun"},{"name":"Hora 19","start":"23:25","end":"00:25","startHours":23.420970347618553,"endHours":24.420970347618553,"planetary_lord":"Mars"},{"name":"Hora 20","start":"00:25","end":"01:25","startHours":24.420970347618553,"endHours":25.420970347618553,"planetary_lord":"Jupiter"},{"name":"Hora 21","start":"01:25","end":"02:25","startHours":25.420970347618553,"endHours":26.420970347618553,"planetary_lord":"Saturn"},{"name":"Hora 22","start":"02:25","end":"03:25","startHours":26.420970347618553,"endHours":27.420970347618553,"planetary_lord":"Moon"},{"name":"Hora 23","start":"03:25","end":"04:25","startHours":27.420970347618553,"endHours":28.420970347618553,"planetary_lord":"Mercury"},{"name":"Hora 24","start":"04:25","end":"05:25","startHours":28.420970347618553,"endHours":29.420970347618553,"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":["Meṣa","Vṛṣabha","Karka","Kanyā","Dhanu","Makara"],"unfavorable_rashis":["Mithuna","Siṃha","Tulā","Vṛścika","Kumbha","Mīna"]},"dishaShool":"East (Pūrva)","chandraVasa":"South-West","rahuVasa":"North-East","anandadiYoga":{"name":"Maitra","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":8.953356061645046,"eotMinutes":-0.7698108297043191,"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 Navamī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"rama-navami","name":"Rāma Navamī","name_sanskrit":"राम नवमी","tradition":"Vaishnava","associated_deity":"Rāma (18th avatāra of Krishna)","deity_avatara_index":18,"significance":"Bhagavān Rāma's birth at Ayodhyā. Sūryavaṃśa's most exalted moment.","vrata":true,"primary_observance":"Madhyāhna (noon) abhiṣekam in Ayodhyā tradition","detection":{"tithi_number":9,"tithi_paksha":"Śukla","lunar_month":"Caitra"},"precedence":1,"related_chart":"rama","historical_anchor":{"event":"Bhagavān Rāma's birth at Ayodhyā","date_julian":"-1626101-04-03","location":"Ayodhyā"},"sources":["Vālmīki Rāmāyaṇa, Bāla-Kāṇḍa 1.18"]},{"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_ingress":"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_ingress":"Meṣa"},"precedence":2}],"todays_walk":{"walk":{"id":"rama-navami-walk","name":"Rāma Navamī Walk","name_sanskrit":"राम नवमी यात्रा","type":"festival","description":"Vālmīki Bāla-Kāṇḍa selections + BG 4.7-8 (avatāra principle).","step_count":9,"url":"/walk/rama-navami-walk"},"reason":"Today is Rāma Navamī — its dedicated walk."},"cosmic_resonances":[{"historical_date":"-1626101-04-03","event":"Bhagavān Rāma's birth at Ayodhyā","chart_id":"rama","shared_marker":"same Śukla Navamī","url":"/day/-1626101-04-03","relevance":0.5}]},"validity":{"eternal":false,"location_specific":"seattle"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga April 13, 1981 CE · Seattle, USA · Vidhyamitra","description":"April 13, 1981 CE for Seattle, USA: Śukla Navamī, sūryodaya 05:25, sūryāsta 18:55.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/seattle/1981-04-13","hreflang_alternates":{"en":"https://vidhyamitra.com/city/seattle/1981-04-13","sa":"https://sa.vidhyamitra.com/city/seattle/1981-04-13","hi":"https://hi.vidhyamitra.com/city/seattle/1981-04-13","x-default":"https://vidhyamitra.com/city/seattle/1981-04-13"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-01T12:41:31.268Z","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":"2026-06-01T12:41:31.268Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-01T12:41:31.268Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}