{"id":"vidhyamitra:city-day:colombo:1981-12-17:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/colombo/1981-12-17","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-12-17","date_display":"December 17, 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":12,"day":17,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444955.770833,"kali_year":5083,"ahargana":1856490.2708,"sun":{"sidereal_longitude":241.0895,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":134.1193,"rashi":5,"rashi_name":"Siṃha"},"tithi":{"number":22,"name":"Saptamī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Saptamī","elongation_degrees":253.0298,"elapsed_within_tithi_degrees":1.0298},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":1,"moon_longitude":134.1193,"elapsed_within_degrees":0.7859},"yoga":{"number":2,"name":"Prīti","sum_longitude":15.2087},"karana":{"half_tithi_index":42,"name":"Viṣṭi"},"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":12,"day":17,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444955.770833,"ahargana":1856490.2708,"kali_year":5083,"ayanamsa_lahiri":23.601,"grahas":{"sun":{"sidereal_longitude":241.412867,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":1},"retrograde":false},"moon":{"sidereal_longitude":137.21096699999998,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":2},"retrograde":false,"latitude":2.8852},"mars":{"sidereal_longitude":157.100867,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":245.26536699999997,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":2},"retrograde":false},"jupiter":{"sidereal_longitude":190.50356699999998,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":2},"retrograde":false},"venus":{"sidereal_longitude":281.56666700000005,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":1},"retrograde":false},"saturn":{"sidereal_longitude":176.60236699999996,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":1},"retrograde":false},"rahu":{"sidereal_longitude":94.2114,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":274.2114,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","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":12,"day":17,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444955.770833,"kali_year":5083,"ahargana":1856490.2708,"sun":{"sidereal_longitude":241.0895,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":134.1193,"rashi":5,"rashi_name":"Siṃha"},"tithi":{"number":22,"name":"Saptamī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Saptamī","elongation_degrees":253.0298,"elapsed_within_tithi_degrees":1.0298},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":1,"moon_longitude":134.1193,"elapsed_within_degrees":0.7859},"yoga":{"number":2,"name":"Prīti","sum_longitude":15.2087},"karana":{"half_tithi_index":42,"name":"Viṣṭi"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":2.885,"elongation":106.97},"lunar":{"type":"lunar","occurs":false,"moon_latitude":2.885,"opposition_distance":73.03}},"eclipse_window_40days":[]},"city":{"slug":"colombo","name":"Colombo, Sri Lanka","lat":6.9271,"lon":79.8612,"tz_offset_hours":5.5,"country":"LK","tier":"diaspora"},"tier2":{"city":{"slug":"colombo","name":"Colombo, Sri Lanka","lat":6.9271,"lon":79.8612,"tz_offset_hours":5.5,"country":"LK","tier":"diaspora"},"sunriseLocal":"06:16","sunsetLocal":"17:59","solarNoonLocal":"12:07","dayLengthHours":11.721253489394769,"dayLengthDisplay":"11 Hours 43 Mins 17 Secs","nightLengthDisplay":"12 Hours 16 Mins 43 Secs","moonriseLocal":"23:04","moonsetLocal":"11:17","rahuKala":{"name":"Rāhu Kāla","start":"13:35","end":"15:03","startHours":13.586853871555874,"endHours":15.05201055773022,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"06:16","end":"07:44","startHours":6.2610704406841435,"endHours":7.72622712685849,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"09:11","end":"10:39","startHours":9.191383813032836,"endHours":10.656540499207182,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:00","end":"09:23","startHours":8.99602958820959,"endHours":9.386738037856082,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:45","end":"07:04","startHours":6.749456002742259,"endHours":7.062022762459453,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:44","end":"12:31","startHours":11.730988735735036,"endHours":12.51240563502802,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:42","end":"05:29","startHours":4.698236642098174,"endHours":5.4796535413911585,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:17","end":"06:16","startHours":5.284299316567913,"endHours":6.2610704406841435,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:05","end":"14:51","startHours":14.07523943361399,"endHours":14.856656332906976,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:47","end":"18:11","startHours":17.782323930078913,"endHours":18.182323930078912,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:59","end":"18:28","startHours":17.982323930078913,"endHours":18.47070949213703,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:44","end":"19:29","startHours":17.732323930078913,"endHours":19.482323930078913,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:44","end":"00:31","startHours":23.730988735735036,"endHours":24.51240563502802,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Śubha","start":"06:16","end":"07:44","startHours":6.2610704406841435,"endHours":7.72622712685849,"quality":"auspicious"},{"name":"Roga","start":"07:44","end":"09:11","startHours":7.72622712685849,"endHours":9.191383813032836,"quality":"inauspicious"},{"name":"Udveg","start":"09:11","end":"10:39","startHours":9.191383813032836,"endHours":10.656540499207182,"quality":"inauspicious"},{"name":"Chala","start":"10:39","end":"12:07","startHours":10.656540499207182,"endHours":12.121697185381528,"quality":"neutral"},{"name":"Labha","start":"12:07","end":"13:35","startHours":12.121697185381528,"endHours":13.586853871555874,"quality":"auspicious"},{"name":"Amṛta","start":"13:35","end":"15:03","startHours":13.586853871555874,"endHours":15.05201055773022,"quality":"auspicious"},{"name":"Kāla","start":"15:03","end":"16:31","startHours":15.05201055773022,"endHours":16.517167243904566,"quality":"inauspicious"},{"name":"Śubha","start":"16:31","end":"17:59","startHours":16.517167243904566,"endHours":17.982323930078913,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Amṛta","start":"17:59","end":"19:31","startHours":17.982323930078913,"endHours":19.517167243904566,"quality":"auspicious"},{"name":"Kāla","start":"19:31","end":"21:03","startHours":19.517167243904566,"endHours":21.05201055773022,"quality":"inauspicious"},{"name":"Śubha","start":"21:03","end":"22:35","startHours":21.05201055773022,"endHours":22.586853871555874,"quality":"auspicious"},{"name":"Roga","start":"22:35","end":"00:07","startHours":22.586853871555874,"endHours":24.121697185381528,"quality":"inauspicious"},{"name":"Udveg","start":"00:07","end":"01:39","startHours":24.121697185381528,"endHours":25.656540499207182,"quality":"inauspicious"},{"name":"Chala","start":"01:39","end":"03:11","startHours":25.656540499207182,"endHours":27.191383813032836,"quality":"neutral"},{"name":"Labha","start":"03:11","end":"04:44","startHours":27.191383813032836,"endHours":28.72622712685849,"quality":"auspicious"},{"name":"Amṛta","start":"04:44","end":"06:16","startHours":28.72622712685849,"endHours":30.261070440684144,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"06:16","end":"07:16","startHours":6.2610704406841435,"endHours":7.2610704406841435,"planetary_lord":"Jupiter"},{"name":"Hora 2","start":"07:16","end":"08:16","startHours":7.2610704406841435,"endHours":8.261070440684144,"planetary_lord":"Saturn"},{"name":"Hora 3","start":"08:16","end":"09:16","startHours":8.261070440684144,"endHours":9.261070440684144,"planetary_lord":"Moon"},{"name":"Hora 4","start":"09:16","end":"10:16","startHours":9.261070440684144,"endHours":10.261070440684144,"planetary_lord":"Mercury"},{"name":"Hora 5","start":"10:16","end":"11:16","startHours":10.261070440684144,"endHours":11.261070440684144,"planetary_lord":"Venus"},{"name":"Hora 6","start":"11:16","end":"12:16","startHours":11.261070440684144,"endHours":12.261070440684144,"planetary_lord":"Sun"},{"name":"Hora 7","start":"12:16","end":"13:16","startHours":12.261070440684144,"endHours":13.261070440684144,"planetary_lord":"Mars"},{"name":"Hora 8","start":"13:16","end":"14:16","startHours":13.261070440684144,"endHours":14.261070440684144,"planetary_lord":"Jupiter"},{"name":"Hora 9","start":"14:16","end":"15:16","startHours":14.261070440684144,"endHours":15.261070440684144,"planetary_lord":"Saturn"},{"name":"Hora 10","start":"15:16","end":"16:16","startHours":15.261070440684144,"endHours":16.261070440684144,"planetary_lord":"Moon"},{"name":"Hora 11","start":"16:16","end":"17:16","startHours":16.261070440684144,"endHours":17.261070440684144,"planetary_lord":"Mercury"},{"name":"Hora 12","start":"17:16","end":"18:16","startHours":17.261070440684144,"endHours":18.261070440684144,"planetary_lord":"Venus"},{"name":"Hora 13","start":"18:16","end":"19:16","startHours":18.261070440684144,"endHours":19.261070440684144,"planetary_lord":"Sun"},{"name":"Hora 14","start":"19:16","end":"20:16","startHours":19.261070440684144,"endHours":20.261070440684144,"planetary_lord":"Mars"},{"name":"Hora 15","start":"20:16","end":"21:16","startHours":20.261070440684144,"endHours":21.261070440684144,"planetary_lord":"Jupiter"},{"name":"Hora 16","start":"21:16","end":"22:16","startHours":21.261070440684144,"endHours":22.261070440684144,"planetary_lord":"Saturn"},{"name":"Hora 17","start":"22:16","end":"23:16","startHours":22.261070440684144,"endHours":23.261070440684144,"planetary_lord":"Moon"},{"name":"Hora 18","start":"23:16","end":"00:16","startHours":23.261070440684144,"endHours":24.261070440684144,"planetary_lord":"Mercury"},{"name":"Hora 19","start":"00:16","end":"01:16","startHours":24.261070440684144,"endHours":25.261070440684144,"planetary_lord":"Venus"},{"name":"Hora 20","start":"01:16","end":"02:16","startHours":25.261070440684144,"endHours":26.261070440684144,"planetary_lord":"Sun"},{"name":"Hora 21","start":"02:16","end":"03:16","startHours":26.261070440684144,"endHours":27.261070440684144,"planetary_lord":"Mars"},{"name":"Hora 22","start":"03:16","end":"04:16","startHours":27.261070440684144,"endHours":28.261070440684144,"planetary_lord":"Jupiter"},{"name":"Hora 23","start":"04:16","end":"05:16","startHours":28.261070440684144,"endHours":29.261070440684144,"planetary_lord":"Saturn"},{"name":"Hora 24","start":"05:16","end":"06:16","startHours":29.261070440684144,"endHours":30.261070440684144,"planetary_lord":"Moon"}],"taraBala":{"favorable_nakshatras":["Kṛttikā","Rohiṇī","Mṛgaśirā","Ārdrā","Punarvasu","Uttara Phalgunī","Hasta","Citrā","Svātī","Viśākhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā"],"unfavorable_nakshatras":["Aśvinī","Bharaṇī","Puṣya","Aśleṣā","Maghā","Pūrva Phalgunī","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Bhādrapadā","Revatī"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Vṛṣabha","Mithuna","Siṃha","Tulā","Makara","Kumbha"],"unfavorable_rashis":["Meṣa","Karka","Kanyā","Vṛścika","Dhanu","Mīna"]},"dishaShool":"South (Dakṣiṇa)","chandraVasa":"West","rahuVasa":"North-West","anandadiYoga":{"name":"Sushira","quality":"Auspicious"},"tropicalRitu":"Hemanta (Pre-winter)","vedicRitu":"Hemanta (Pre-winter)","tropicalAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-23.342542570154922,"eotMinutes":3.253368877108411,"ayanamsa":23.601}},"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 Kṛṣṇa Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Pauṣa","lunar_month_amanta":"Mārgaśīrṣa","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Dhanus (Mārgaḻi)","ritu":"Hemanta (Pre-winter)","display_summary":"Pauṣa Kṛṣṇa Saptamī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[],"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":[]},"validity":{"eternal":false,"location_specific":"colombo"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga December 17, 1981 CE · Colombo, Sri Lanka · Vidhyamitra","description":"December 17, 1981 CE for Colombo, Sri Lanka: Kṛṣṇa Saptamī, sūryodaya 06:16, sūryāsta 17:59.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/colombo/1981-12-17","hreflang_alternates":{"en":"https://vidhyamitra.com/city/colombo/1981-12-17","sa":"https://sa.vidhyamitra.com/city/colombo/1981-12-17","hi":"https://hi.vidhyamitra.com/city/colombo/1981-12-17","x-default":"https://vidhyamitra.com/city/colombo/1981-12-17"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-02T12:16:42.690Z","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":"2026-06-02T12:16:42.690Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-02T12:16:42.690Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}