{"id":"vidhyamitra:city-day:thane:1981-02-12:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/thane/1981-02-12","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-02-12","date_display":"February 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":2,"day":12,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444647.770833,"kali_year":5082,"ahargana":1856182.2708,"sun":{"sidereal_longitude":299.7833,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":32.54,"rashi":2,"rashi_name":"Vṛṣabha"},"tithi":{"number":8,"name":"Aṣṭamī","paksha":"Śukla","full_name":"Śukla Aṣṭamī","elongation_degrees":92.7567,"elapsed_within_tithi_degrees":8.7567},"nakshatra":{"number":3,"name":"Kṛttikā","pada":2,"moon_longitude":32.54,"elapsed_within_degrees":5.8733},"yoga":{"number":25,"name":"Brahma","sum_longitude":332.3233},"karana":{"half_tithi_index":15,"name":"Bava"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"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":2,"day":12,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444647.770833,"ahargana":1856182.2708,"kali_year":5082,"ayanamsa_lahiri":23.5892,"grahas":{"sun":{"sidereal_longitude":299.65443500000003,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":2},"retrograde":false},"moon":{"sidereal_longitude":33.51203499999997,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":3,"name":"Kṛttikā","pada":3},"retrograde":false,"latitude":-4.4013},"mars":{"sidereal_longitude":310.73093500000004,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":2},"retrograde":false},"mercury":{"sidereal_longitude":310.54843500000004,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":2},"retrograde":true},"jupiter":{"sidereal_longitude":166.33283499999993,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":true},"venus":{"sidereal_longitude":286.444835,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":165.45383500000003,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":true},"rahu":{"sidereal_longitude":110.5307,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":290.5307,"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":2,"day":12,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444647.770833,"kali_year":5082,"ahargana":1856182.2708,"sun":{"sidereal_longitude":299.7833,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":32.54,"rashi":2,"rashi_name":"Vṛṣabha"},"tithi":{"number":8,"name":"Aṣṭamī","paksha":"Śukla","full_name":"Śukla Aṣṭamī","elongation_degrees":92.7567,"elapsed_within_tithi_degrees":8.7567},"nakshatra":{"number":3,"name":"Kṛttikā","pada":2,"moon_longitude":32.54,"elapsed_within_degrees":5.8733},"yoga":{"number":25,"name":"Brahma","sum_longitude":332.3233},"karana":{"half_tithi_index":15,"name":"Bava"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-4.401,"elongation":92.757},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-4.401,"opposition_distance":87.243}},"eclipse_window_40days":[{"offset_days":-7,"type":"solar","occurs":true,"moon_latitude":-0.15,"elongation":0.162}]},"city":{"slug":"thane","name":"Thane, Maharashtra","lat":19.2183,"lon":72.9781,"tz_offset_hours":5.5,"state":"Maharashtra","country":"IN","tier":"tier-1"},"tier2":{"city":{"slug":"thane","name":"Thane, Maharashtra","lat":19.2183,"lon":72.9781,"tz_offset_hours":5.5,"state":"Maharashtra","country":"IN","tier":"tier-1"},"sunriseLocal":"07:09","sunsetLocal":"18:37","solarNoonLocal":"12:53","dayLengthHours":11.468081083502117,"dayLengthDisplay":"11 Hours 28 Mins 05 Secs","nightLengthDisplay":"12 Hours 31 Mins 55 Secs","moonriseLocal":"12:37","moonsetLocal":"01:39","rahuKala":{"name":"Rāhu Kāla","start":"14:19","end":"15:45","startHours":14.311549003685936,"endHours":15.745059139123704,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"07:09","end":"08:35","startHours":7.1439983264971145,"endHours":8.57750846193488,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"10:01","end":"11:27","startHours":10.011018597372644,"endHours":11.444528732810408,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:49","end":"10:12","startHours":9.819883912647608,"endHours":10.20215328209768,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:37","end":"07:56","startHours":7.621835038309703,"endHours":7.927650533869759,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:30","end":"13:16","startHours":12.495769498798103,"endHours":13.260308237698245,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:37","end":"06:23","startHours":5.6149208486968325,"endHours":6.3794595875969735,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"06:11","end":"07:09","startHours":6.188324902871938,"endHours":7.1439983264971145,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:47","end":"15:33","startHours":14.789385715498526,"endHours":15.553924454398667,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:25","end":"18:49","startHours":18.412079409999233,"endHours":18.81207940999923,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:37","end":"19:05","startHours":18.612079409999232,"endHours":19.08991612181182,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:22","end":"20:07","startHours":18.362079409999232,"endHours":20.112079409999232,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:30","end":"01:16","startHours":24.495769498798104,"endHours":25.260308237698247,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Śubha","start":"07:09","end":"08:35","startHours":7.1439983264971145,"endHours":8.57750846193488,"quality":"auspicious"},{"name":"Roga","start":"08:35","end":"10:01","startHours":8.57750846193488,"endHours":10.011018597372644,"quality":"inauspicious"},{"name":"Udveg","start":"10:01","end":"11:27","startHours":10.011018597372644,"endHours":11.444528732810408,"quality":"inauspicious"},{"name":"Chala","start":"11:27","end":"12:53","startHours":11.444528732810408,"endHours":12.878038868248172,"quality":"neutral"},{"name":"Labha","start":"12:53","end":"14:19","startHours":12.878038868248172,"endHours":14.311549003685936,"quality":"auspicious"},{"name":"Amṛta","start":"14:19","end":"15:45","startHours":14.311549003685936,"endHours":15.745059139123704,"quality":"auspicious"},{"name":"Kāla","start":"15:45","end":"17:11","startHours":15.745059139123704,"endHours":17.178569274561468,"quality":"inauspicious"},{"name":"Śubha","start":"17:11","end":"18:37","startHours":17.178569274561468,"endHours":18.612079409999232,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Amṛta","start":"18:37","end":"20:11","startHours":18.612079409999232,"endHours":20.178569274561468,"quality":"auspicious"},{"name":"Kāla","start":"20:11","end":"21:45","startHours":20.178569274561468,"endHours":21.745059139123704,"quality":"inauspicious"},{"name":"Śubha","start":"21:45","end":"23:19","startHours":21.745059139123704,"endHours":23.31154900368594,"quality":"auspicious"},{"name":"Roga","start":"23:19","end":"00:53","startHours":23.31154900368594,"endHours":24.878038868248176,"quality":"inauspicious"},{"name":"Udveg","start":"00:53","end":"02:27","startHours":24.878038868248176,"endHours":26.44452873281041,"quality":"inauspicious"},{"name":"Chala","start":"02:27","end":"04:01","startHours":26.44452873281041,"endHours":28.011018597372644,"quality":"neutral"},{"name":"Labha","start":"04:01","end":"05:35","startHours":28.011018597372644,"endHours":29.57750846193488,"quality":"auspicious"},{"name":"Amṛta","start":"05:35","end":"07:09","startHours":29.57750846193488,"endHours":31.143998326497115,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"07:09","end":"08:09","startHours":7.1439983264971145,"endHours":8.143998326497115,"planetary_lord":"Jupiter"},{"name":"Hora 2","start":"08:09","end":"09:09","startHours":8.143998326497115,"endHours":9.143998326497115,"planetary_lord":"Saturn"},{"name":"Hora 3","start":"09:09","end":"10:09","startHours":9.143998326497115,"endHours":10.143998326497115,"planetary_lord":"Moon"},{"name":"Hora 4","start":"10:09","end":"11:09","startHours":10.143998326497115,"endHours":11.143998326497115,"planetary_lord":"Mercury"},{"name":"Hora 5","start":"11:09","end":"12:09","startHours":11.143998326497115,"endHours":12.143998326497115,"planetary_lord":"Venus"},{"name":"Hora 6","start":"12:09","end":"13:09","startHours":12.143998326497115,"endHours":13.143998326497115,"planetary_lord":"Sun"},{"name":"Hora 7","start":"13:09","end":"14:09","startHours":13.143998326497115,"endHours":14.143998326497115,"planetary_lord":"Mars"},{"name":"Hora 8","start":"14:09","end":"15:09","startHours":14.143998326497115,"endHours":15.143998326497115,"planetary_lord":"Jupiter"},{"name":"Hora 9","start":"15:09","end":"16:09","startHours":15.143998326497115,"endHours":16.143998326497115,"planetary_lord":"Saturn"},{"name":"Hora 10","start":"16:09","end":"17:09","startHours":16.143998326497115,"endHours":17.143998326497115,"planetary_lord":"Moon"},{"name":"Hora 11","start":"17:09","end":"18:09","startHours":17.143998326497115,"endHours":18.143998326497115,"planetary_lord":"Mercury"},{"name":"Hora 12","start":"18:09","end":"19:09","startHours":18.143998326497115,"endHours":19.143998326497115,"planetary_lord":"Venus"},{"name":"Hora 13","start":"19:09","end":"20:09","startHours":19.143998326497115,"endHours":20.143998326497115,"planetary_lord":"Sun"},{"name":"Hora 14","start":"20:09","end":"21:09","startHours":20.143998326497115,"endHours":21.143998326497115,"planetary_lord":"Mars"},{"name":"Hora 15","start":"21:09","end":"22:09","startHours":21.143998326497115,"endHours":22.143998326497115,"planetary_lord":"Jupiter"},{"name":"Hora 16","start":"22:09","end":"23:09","startHours":22.143998326497115,"endHours":23.143998326497115,"planetary_lord":"Saturn"},{"name":"Hora 17","start":"23:09","end":"00:09","startHours":23.143998326497115,"endHours":24.143998326497115,"planetary_lord":"Moon"},{"name":"Hora 18","start":"00:09","end":"01:09","startHours":24.143998326497115,"endHours":25.143998326497115,"planetary_lord":"Mercury"},{"name":"Hora 19","start":"01:09","end":"02:09","startHours":25.143998326497115,"endHours":26.143998326497115,"planetary_lord":"Venus"},{"name":"Hora 20","start":"02:09","end":"03:09","startHours":26.143998326497115,"endHours":27.143998326497115,"planetary_lord":"Sun"},{"name":"Hora 21","start":"03:09","end":"04:09","startHours":27.143998326497115,"endHours":28.143998326497115,"planetary_lord":"Mars"},{"name":"Hora 22","start":"04:09","end":"05:09","startHours":28.143998326497115,"endHours":29.143998326497115,"planetary_lord":"Jupiter"},{"name":"Hora 23","start":"05:09","end":"06:09","startHours":29.143998326497115,"endHours":30.143998326497115,"planetary_lord":"Saturn"},{"name":"Hora 24","start":"06:09","end":"07:09","startHours":30.143998326497115,"endHours":31.143998326497115,"planetary_lord":"Moon"}],"taraBala":{"favorable_nakshatras":["Rohiṇī","Mṛgaśirā","Ārdrā","Punarvasu","Puṣya","Hasta","Citrā","Svātī","Viśākhā","Anurādhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā"],"unfavorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Aśleṣā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Revatī"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Vṛṣabha","Karka","Tulā","Vṛścika","Kumbha","Mīna"],"unfavorable_rashis":["Meṣa","Mithuna","Siṃha","Kanyā","Dhanu","Makara"]},"dishaShool":"South (Dakṣiṇa)","chandraVasa":"South-East","rahuVasa":"North-West","anandadiYoga":{"name":"Siddhi","quality":"Auspicious"},"drikRitu":"Śiśira (Winter) (Drik)","vedicRitu":"Hemanta (Pre-winter)","drikAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":-13.769031191900837,"eotMinutes":-14.594732094890398,"ayanamsa":23.5892}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Māgha","lunar_month_paksha_full":"Māgha Śukla Pakṣa","solar_month":"Makara (Tai)","ritu":"Śiśira (Winter)","display_summary":"Māgha Śukla Aṣṭamī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"makara-sankranti","name":"Makara Saṅkrānti (Uttarāyaṇa)","name_sanskrit":"मकर सङ्क्रान्ति","tradition":"Pan-Hindu","associated_deity":"Sūrya Bhagavān","significance":"Sun enters Capricorn; Uttarāyaṇa (north-going) begins. Bhīṣma's chosen mahaprasthāna time.","vrata":true,"detection":{"sun_rashi":"Makara"},"precedence":1,"sources":["Mahābhārata Bhīṣma-Stuti","Sūrya-Siddhānta"]},{"id":"bhishma-ashtami","name":"Bhīṣmāṣṭamī","name_sanskrit":"भीष्माष्टमी","tradition":"Pan-Hindu","associated_deity":"Bhīṣma Pitāmaha","significance":"Bhīṣma's mahaprasthāna anniversary (Māgha Śukla 8); Bhīṣma-tarpaṇa.","vrata":true,"detection":{"tithi_number":8,"tithi_paksha":"Śukla","lunar_month":"Māgha"},"precedence":2,"sources":["Mahābhārata, Anuśāsana Parva"]},{"id":"pongal","name":"Pongal / Thai Pongal","name_sanskrit":"पोङ्गल","tradition":"Regional","associated_deity":"Sūrya Bhagavān","significance":"Tamil 4-day harvest festival; coincides with Makara Saṅkrānti.","vrata":false,"detection":{"sun_rashi":"Makara"},"precedence":2}],"todays_walk":{"walk":{"id":"guru-walk","name":"Bṛhaspati Walk","name_sanskrit":"गुरु यात्रा","type":"graha","description":"Wisdom transmission + BG 4.34.","step_count":8,"url":"/walk/guru-walk"},"reason":"Guruvāra (Thursday) — its presiding graha's walk."},"cosmic_resonances":[{"historical_date":"-3137-12-25","event":"Bhīṣma's Mahaprasthan","chart_id":"bhishma","shared_marker":"same Śukla Aṣṭamī + Kṛttikā","url":"/day/-3137-12-25","relevance":1},{"historical_date":"-3137-10-04","event":"Mahābhārata Day 1 (Bhagavad Gītā delivered)","chart_id":"krishna","shared_marker":"same Kṛttikā","url":"/day/-3137-10-04","relevance":0.5}]},"validity":{"eternal":false,"location_specific":"thane"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga February 12, 1981 CE · Thane, Maharashtra · Vidhyamitra","description":"February 12, 1981 CE for Thane, Maharashtra: Śukla Aṣṭamī, sūryodaya 07:09, sūryāsta 18:37.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/thane/1981-02-12","hreflang_alternates":{"en":"https://vidhyamitra.com/city/thane/1981-02-12","sa":"https://sa.vidhyamitra.com/city/thane/1981-02-12","hi":"https://hi.vidhyamitra.com/city/thane/1981-02-12","x-default":"https://vidhyamitra.com/city/thane/1981-02-12"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-18T11:36:37.634Z","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":"2026-05-18T11:36:37.634Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-18T11:36:37.634Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}