{"id":"vidhyamitra:city-day:thane:1981-02-09:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/thane/1981-02-09","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-02-09","date_display":"February 9, 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":9,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444644.770833,"kali_year":5082,"ahargana":1856179.2708,"sun":{"sidereal_longitude":296.7316,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":349.1755,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":5,"name":"Pañcamī","paksha":"Śukla","full_name":"Śukla Pañcamī","elongation_degrees":52.4439,"elapsed_within_tithi_degrees":4.4439},"nakshatra":{"number":27,"name":"Revatī","pada":1,"moon_longitude":349.1755,"elapsed_within_degrees":2.5089},"yoga":{"number":22,"name":"Sādhya","sum_longitude":285.9071},"karana":{"half_tithi_index":8,"name":"Bava"},"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":2,"day":9,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444644.770833,"ahargana":1856179.2708,"kali_year":5082,"ayanamsa_lahiri":23.5891,"grahas":{"sun":{"sidereal_longitude":296.61915,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":1},"retrograde":false},"moon":{"sidereal_longitude":350.75265,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":2},"retrograde":false,"latitude":-3.8352},"mars":{"sidereal_longitude":308.36175000000003,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":1},"retrograde":false},"mercury":{"sidereal_longitude":311.6260500000001,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":2},"retrograde":false},"jupiter":{"sidereal_longitude":166.48894999999993,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":true},"venus":{"sidereal_longitude":282.68935,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":1},"retrograde":false},"saturn":{"sidereal_longitude":165.57065,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":true},"rahu":{"sidereal_longitude":110.6897,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":290.6897,"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":9,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444644.770833,"kali_year":5082,"ahargana":1856179.2708,"sun":{"sidereal_longitude":296.7316,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":349.1755,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":5,"name":"Pañcamī","paksha":"Śukla","full_name":"Śukla Pañcamī","elongation_degrees":52.4439,"elapsed_within_tithi_degrees":4.4439},"nakshatra":{"number":27,"name":"Revatī","pada":1,"moon_longitude":349.1755,"elapsed_within_degrees":2.5089},"yoga":{"number":22,"name":"Sādhya","sum_longitude":285.9071},"karana":{"half_tithi_index":8,"name":"Bava"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-3.835,"elongation":52.444},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-3.835,"opposition_distance":127.556}},"eclipse_window_40days":[{"offset_days":-20,"type":"lunar","occurs":true,"moon_latitude":-1.332,"opposition_distance":1.776},{"offset_days":-4,"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":"07:10","sunsetLocal":"18:35","solarNoonLocal":"12:53","dayLengthHours":11.420096863671873,"dayLengthDisplay":"11 Hours 25 Mins 12 Secs","nightLengthDisplay":"12 Hours 34 Mins 48 Secs","moonriseLocal":"10:19","moonsetLocal":"22:40","rahuKala":{"name":"Rāhu Kāla","start":"08:36","end":"10:01","startHours":8.593978838166247,"endHours":10.02149094612523,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"11:27","end":"12:53","startHours":11.449003054084216,"endHours":12.876515162043198,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"14:18","end":"15:44","startHours":14.304027270002184,"endHours":15.731539377961166,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:50","end":"10:13","startHours":9.831155998397366,"endHours":10.211825893853096,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:39","end":"07:57","startHours":7.642304099526924,"endHours":7.946840015891507,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:30","end":"13:15","startHours":12.49584526658747,"endHours":13.257185057498926,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:39","end":"06:24","startHours":5.643787148384346,"endHours":6.405126939295804,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"06:13","end":"07:10","startHours":6.21479199156794,"endHours":7.166466730207262,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:47","end":"15:32","startHours":14.779864639321843,"endHours":15.541204430233302,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:23","end":"18:47","startHours":18.386563593879135,"endHours":18.786563593879134,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:35","end":"19:04","startHours":18.586563593879134,"endHours":19.062400963198797,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:20","end":"20:05","startHours":18.336563593879134,"endHours":20.086563593879134,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:30","end":"01:15","startHours":24.49584526658747,"endHours":25.257185057498926,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Amṛta","start":"07:10","end":"08:36","startHours":7.166466730207262,"endHours":8.593978838166247,"quality":"auspicious"},{"name":"Kāla","start":"08:36","end":"10:01","startHours":8.593978838166247,"endHours":10.02149094612523,"quality":"inauspicious"},{"name":"Śubha","start":"10:01","end":"11:27","startHours":10.02149094612523,"endHours":11.449003054084216,"quality":"auspicious"},{"name":"Roga","start":"11:27","end":"12:53","startHours":11.449003054084216,"endHours":12.876515162043198,"quality":"inauspicious"},{"name":"Udveg","start":"12:53","end":"14:18","startHours":12.876515162043198,"endHours":14.304027270002184,"quality":"inauspicious"},{"name":"Chala","start":"14:18","end":"15:44","startHours":14.304027270002184,"endHours":15.731539377961166,"quality":"neutral"},{"name":"Labha","start":"15:44","end":"17:10","startHours":15.731539377961166,"endHours":17.159051485920152,"quality":"auspicious"},{"name":"Amṛta","start":"17:10","end":"18:35","startHours":17.159051485920152,"endHours":18.586563593879134,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Chala","start":"18:35","end":"20:10","startHours":18.586563593879134,"endHours":20.159051485920152,"quality":"neutral"},{"name":"Labha","start":"20:10","end":"21:44","startHours":20.159051485920152,"endHours":21.731539377961166,"quality":"auspicious"},{"name":"Amṛta","start":"21:44","end":"23:18","startHours":21.731539377961166,"endHours":23.30402727000218,"quality":"auspicious"},{"name":"Kāla","start":"23:18","end":"00:53","startHours":23.30402727000218,"endHours":24.876515162043198,"quality":"inauspicious"},{"name":"Śubha","start":"00:53","end":"02:27","startHours":24.876515162043198,"endHours":26.449003054084216,"quality":"auspicious"},{"name":"Roga","start":"02:27","end":"04:01","startHours":26.449003054084216,"endHours":28.02149094612523,"quality":"inauspicious"},{"name":"Udveg","start":"04:01","end":"05:36","startHours":28.02149094612523,"endHours":29.593978838166244,"quality":"inauspicious"},{"name":"Chala","start":"05:36","end":"07:10","startHours":29.593978838166244,"endHours":31.16646673020726,"quality":"neutral"}],"horas":[{"name":"Hora 1","start":"07:10","end":"08:10","startHours":7.166466730207262,"endHours":8.166466730207262,"planetary_lord":"Moon"},{"name":"Hora 2","start":"08:10","end":"09:10","startHours":8.166466730207262,"endHours":9.166466730207262,"planetary_lord":"Mercury"},{"name":"Hora 3","start":"09:10","end":"10:10","startHours":9.166466730207262,"endHours":10.166466730207262,"planetary_lord":"Venus"},{"name":"Hora 4","start":"10:10","end":"11:10","startHours":10.166466730207262,"endHours":11.166466730207262,"planetary_lord":"Sun"},{"name":"Hora 5","start":"11:10","end":"12:10","startHours":11.166466730207262,"endHours":12.166466730207262,"planetary_lord":"Mars"},{"name":"Hora 6","start":"12:10","end":"13:10","startHours":12.166466730207262,"endHours":13.166466730207262,"planetary_lord":"Jupiter"},{"name":"Hora 7","start":"13:10","end":"14:10","startHours":13.166466730207262,"endHours":14.166466730207262,"planetary_lord":"Saturn"},{"name":"Hora 8","start":"14:10","end":"15:10","startHours":14.166466730207262,"endHours":15.166466730207262,"planetary_lord":"Moon"},{"name":"Hora 9","start":"15:10","end":"16:10","startHours":15.166466730207262,"endHours":16.16646673020726,"planetary_lord":"Mercury"},{"name":"Hora 10","start":"16:10","end":"17:10","startHours":16.16646673020726,"endHours":17.16646673020726,"planetary_lord":"Venus"},{"name":"Hora 11","start":"17:10","end":"18:10","startHours":17.16646673020726,"endHours":18.16646673020726,"planetary_lord":"Sun"},{"name":"Hora 12","start":"18:10","end":"19:10","startHours":18.16646673020726,"endHours":19.16646673020726,"planetary_lord":"Mars"},{"name":"Hora 13","start":"19:10","end":"20:10","startHours":19.16646673020726,"endHours":20.16646673020726,"planetary_lord":"Jupiter"},{"name":"Hora 14","start":"20:10","end":"21:10","startHours":20.16646673020726,"endHours":21.16646673020726,"planetary_lord":"Saturn"},{"name":"Hora 15","start":"21:10","end":"22:10","startHours":21.16646673020726,"endHours":22.16646673020726,"planetary_lord":"Moon"},{"name":"Hora 16","start":"22:10","end":"23:10","startHours":22.16646673020726,"endHours":23.16646673020726,"planetary_lord":"Mercury"},{"name":"Hora 17","start":"23:10","end":"00:10","startHours":23.16646673020726,"endHours":24.16646673020726,"planetary_lord":"Venus"},{"name":"Hora 18","start":"00:10","end":"01:10","startHours":24.16646673020726,"endHours":25.16646673020726,"planetary_lord":"Sun"},{"name":"Hora 19","start":"01:10","end":"02:10","startHours":25.16646673020726,"endHours":26.16646673020726,"planetary_lord":"Mars"},{"name":"Hora 20","start":"02:10","end":"03:10","startHours":26.16646673020726,"endHours":27.16646673020726,"planetary_lord":"Jupiter"},{"name":"Hora 21","start":"03:10","end":"04:10","startHours":27.16646673020726,"endHours":28.16646673020726,"planetary_lord":"Saturn"},{"name":"Hora 22","start":"04:10","end":"05:10","startHours":28.16646673020726,"endHours":29.16646673020726,"planetary_lord":"Moon"},{"name":"Hora 23","start":"05:10","end":"06:10","startHours":29.16646673020726,"endHours":30.16646673020726,"planetary_lord":"Mercury"},{"name":"Hora 24","start":"06:10","end":"07:10","startHours":30.16646673020726,"endHours":31.16646673020726,"planetary_lord":"Venus"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Rohiṇī","Mṛgaśirā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Citrā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā"],"unfavorable_nakshatras":["Ārdrā","Punarvasu","Puṣya","Aśleṣā","Svātī","Viśākhā","Anurādhā","Jyeṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"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":"Dhūmra","quality":"Inauspicious"},"tropicalRitu":"Śiśira (Winter) (tropical)","vedicRitu":"Hemanta (Pre-winter)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-14.746827649045654,"eotMinutes":-14.503309722591807,"ayanamsa":23.5891}},"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","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Māgha","lunar_month_amanta":"Māgha","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Makara (Tai)","ritu":"Śiśira (Winter)","display_summary":"Māgha Śukla Pañcamī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"sarasvati-jayanti","name":"Sarasvatī Jayantī (Vasanta Pañchamī)","name_sanskrit":"सरस्वती जयन्ती / वसन्त पञ्चमी","tradition":"Pan-Hindu","associated_deity":"Sarasvatī (Vāk-tattva)","significance":"Manifestation of Devī Sarasvatī; vidyā-ārambha day; vasanta-ṛtu begins.","vrata":true,"detection":{"tithi_number":5,"tithi_paksha":"Śukla","lunar_month":"Māgha"},"precedence":2,"sources":["Skanda Purāṇa","Devī Bhāgavata"]}],"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":"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 9, 1981 CE · Thane, Maharashtra · Vidhyamitra","description":"February 9, 1981 CE for Thane, Maharashtra: Śukla Pañcamī, sūryodaya 07:10, sūryāsta 18:35.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/thane/1981-02-09","hreflang_alternates":{"en":"https://vidhyamitra.com/city/thane/1981-02-09","sa":"https://sa.vidhyamitra.com/city/thane/1981-02-09","hi":"https://hi.vidhyamitra.com/city/thane/1981-02-09","x-default":"https://vidhyamitra.com/city/thane/1981-02-09"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-30T22:35:53.009Z","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":"2026-05-30T22:35:53.009Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-30T22:35:53.009Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}