{"id":"vidhyamitra:city-day:colombo:1981-10-11:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/colombo/1981-10-11","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-10-11","date_display":"October 11, 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":10,"day":11,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444888.770833,"kali_year":5083,"ahargana":1856423.2708,"sun":{"sidereal_longitude":173.3483,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":320.3874,"rashi":11,"rashi_name":"Kumbha"},"tithi":{"number":13,"name":"Trayodaśī","paksha":"Śukla","full_name":"Śukla Trayodaśī","elongation_degrees":147.0391,"elapsed_within_tithi_degrees":3.0391},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":1,"moon_longitude":320.3874,"elapsed_within_degrees":0.3874},"yoga":{"number":11,"name":"Vṛddhi","sum_longitude":133.7358},"karana":{"half_tithi_index":24,"name":"Kaulava"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"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":10,"day":11,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444888.770833,"ahargana":1856423.2708,"kali_year":5083,"ayanamsa_lahiri":23.5984,"grahas":{"sun":{"sidereal_longitude":174.04442700000004,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":1},"retrograde":false},"moon":{"sidereal_longitude":320.42302700000005,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":1},"retrograde":false,"latitude":-3.0458},"mars":{"sidereal_longitude":120.71842700000002,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":1},"retrograde":false},"mercury":{"sidereal_longitude":189.41792699999996,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":1},"retrograde":true},"jupiter":{"sidereal_longitude":176.82742699999994,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":2},"retrograde":false},"venus":{"sidereal_longitude":218.99802699999998,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":169.52502700000002,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":3},"retrograde":false},"rahu":{"sidereal_longitude":97.7614,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":277.7614,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","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":10,"day":11,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444888.770833,"kali_year":5083,"ahargana":1856423.2708,"sun":{"sidereal_longitude":173.3483,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":320.3874,"rashi":11,"rashi_name":"Kumbha"},"tithi":{"number":13,"name":"Trayodaśī","paksha":"Śukla","full_name":"Śukla Trayodaśī","elongation_degrees":147.0391,"elapsed_within_tithi_degrees":3.0391},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":1,"moon_longitude":320.3874,"elapsed_within_degrees":0.3874},"yoga":{"number":11,"name":"Vṛddhi","sum_longitude":133.7358},"karana":{"half_tithi_index":24,"name":"Kaulava"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-3.046,"elongation":147.039},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-3.046,"opposition_distance":32.961}},"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":"05:57","sunsetLocal":"17:57","solarNoonLocal":"11:57","dayLengthHours":11.999996152957053,"dayLengthDisplay":"12 Hours 00 Mins 00 Secs","nightLengthDisplay":"12 Hours 00 Mins 00 Secs","moonriseLocal":"15:43","moonsetLocal":"03:41","rahuKala":{"name":"Rāhu Kāla","start":"16:27","end":"17:57","startHours":16.442812324088393,"endHours":17.942811843208027,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"11:57","end":"13:27","startHours":11.9428137667295,"endHours":13.44281328584913,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"14:57","end":"16:27","startHours":14.942812804968764,"endHours":16.442812324088393,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:45","end":"09:09","startHours":8.742814792607618,"endHours":9.142814664372853,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:27","end":"06:46","startHours":6.442815529957517,"endHours":6.762815427369706,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:33","end":"12:21","startHours":11.542813894964265,"endHours":12.342813638494736,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:21","end":"05:09","startHours":4.342816203190033,"endHours":5.1428159467205035,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:57","end":"05:57","startHours":4.942816010837886,"endHours":5.942815690250973,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"13:57","end":"14:45","startHours":13.942813125555675,"endHours":14.742812869086146,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:45","end":"18:09","startHours":17.742811843208028,"endHours":18.142811843208026,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:57","end":"18:27","startHours":17.942811843208027,"endHours":18.44281168291457,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:42","end":"19:27","startHours":17.692811843208027,"endHours":19.442811843208027,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:33","end":"00:21","startHours":23.542813894964265,"endHours":24.342813638494736,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Udveg","start":"05:57","end":"07:27","startHours":5.942815690250973,"endHours":7.442815209370605,"quality":"inauspicious"},{"name":"Chala","start":"07:27","end":"08:57","startHours":7.442815209370605,"endHours":8.942814728490237,"quality":"neutral"},{"name":"Labha","start":"08:57","end":"10:27","startHours":8.942814728490237,"endHours":10.442814247609867,"quality":"auspicious"},{"name":"Amṛta","start":"10:27","end":"11:57","startHours":10.442814247609867,"endHours":11.9428137667295,"quality":"auspicious"},{"name":"Kāla","start":"11:57","end":"13:27","startHours":11.9428137667295,"endHours":13.44281328584913,"quality":"inauspicious"},{"name":"Śubha","start":"13:27","end":"14:57","startHours":13.44281328584913,"endHours":14.942812804968764,"quality":"auspicious"},{"name":"Roga","start":"14:57","end":"16:27","startHours":14.942812804968764,"endHours":16.442812324088393,"quality":"inauspicious"},{"name":"Udveg","start":"16:27","end":"17:57","startHours":16.442812324088393,"endHours":17.942811843208027,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Śubha","start":"17:57","end":"19:27","startHours":17.942811843208027,"endHours":19.442812324088393,"quality":"auspicious"},{"name":"Roga","start":"19:27","end":"20:57","startHours":19.442812324088393,"endHours":20.942812804968764,"quality":"inauspicious"},{"name":"Udveg","start":"20:57","end":"22:27","startHours":20.942812804968764,"endHours":22.442813285849134,"quality":"inauspicious"},{"name":"Chala","start":"22:27","end":"23:57","startHours":22.442813285849134,"endHours":23.9428137667295,"quality":"neutral"},{"name":"Labha","start":"23:57","end":"01:27","startHours":23.9428137667295,"endHours":25.442814247609867,"quality":"auspicious"},{"name":"Amṛta","start":"01:27","end":"02:57","startHours":25.442814247609867,"endHours":26.942814728490237,"quality":"auspicious"},{"name":"Kāla","start":"02:57","end":"04:27","startHours":26.942814728490237,"endHours":28.442815209370607,"quality":"inauspicious"},{"name":"Śubha","start":"04:27","end":"05:57","startHours":28.442815209370607,"endHours":29.942815690250974,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"05:57","end":"06:57","startHours":5.942815690250973,"endHours":6.942815690250973,"planetary_lord":"Sun"},{"name":"Hora 2","start":"06:57","end":"07:57","startHours":6.942815690250973,"endHours":7.942815690250973,"planetary_lord":"Mars"},{"name":"Hora 3","start":"07:57","end":"08:57","startHours":7.942815690250973,"endHours":8.942815690250974,"planetary_lord":"Jupiter"},{"name":"Hora 4","start":"08:57","end":"09:57","startHours":8.942815690250974,"endHours":9.942815690250974,"planetary_lord":"Saturn"},{"name":"Hora 5","start":"09:57","end":"10:57","startHours":9.942815690250974,"endHours":10.942815690250974,"planetary_lord":"Moon"},{"name":"Hora 6","start":"10:57","end":"11:57","startHours":10.942815690250974,"endHours":11.942815690250974,"planetary_lord":"Mercury"},{"name":"Hora 7","start":"11:57","end":"12:57","startHours":11.942815690250974,"endHours":12.942815690250974,"planetary_lord":"Venus"},{"name":"Hora 8","start":"12:57","end":"13:57","startHours":12.942815690250974,"endHours":13.942815690250974,"planetary_lord":"Sun"},{"name":"Hora 9","start":"13:57","end":"14:57","startHours":13.942815690250974,"endHours":14.942815690250974,"planetary_lord":"Mars"},{"name":"Hora 10","start":"14:57","end":"15:57","startHours":14.942815690250974,"endHours":15.942815690250974,"planetary_lord":"Jupiter"},{"name":"Hora 11","start":"15:57","end":"16:57","startHours":15.942815690250974,"endHours":16.942815690250974,"planetary_lord":"Saturn"},{"name":"Hora 12","start":"16:57","end":"17:57","startHours":16.942815690250974,"endHours":17.942815690250974,"planetary_lord":"Moon"},{"name":"Hora 13","start":"17:57","end":"18:57","startHours":17.942815690250974,"endHours":18.942815690250974,"planetary_lord":"Mercury"},{"name":"Hora 14","start":"18:57","end":"19:57","startHours":18.942815690250974,"endHours":19.942815690250974,"planetary_lord":"Venus"},{"name":"Hora 15","start":"19:57","end":"20:57","startHours":19.942815690250974,"endHours":20.942815690250974,"planetary_lord":"Sun"},{"name":"Hora 16","start":"20:57","end":"21:57","startHours":20.942815690250974,"endHours":21.942815690250974,"planetary_lord":"Mars"},{"name":"Hora 17","start":"21:57","end":"22:57","startHours":21.942815690250974,"endHours":22.942815690250974,"planetary_lord":"Jupiter"},{"name":"Hora 18","start":"22:57","end":"23:57","startHours":22.942815690250974,"endHours":23.942815690250974,"planetary_lord":"Saturn"},{"name":"Hora 19","start":"23:57","end":"00:57","startHours":23.942815690250974,"endHours":24.942815690250974,"planetary_lord":"Moon"},{"name":"Hora 20","start":"00:57","end":"01:57","startHours":24.942815690250974,"endHours":25.942815690250974,"planetary_lord":"Mercury"},{"name":"Hora 21","start":"01:57","end":"02:57","startHours":25.942815690250974,"endHours":26.942815690250974,"planetary_lord":"Venus"},{"name":"Hora 22","start":"02:57","end":"03:57","startHours":26.942815690250974,"endHours":27.942815690250974,"planetary_lord":"Sun"},{"name":"Hora 23","start":"03:57","end":"04:57","startHours":27.942815690250974,"endHours":28.942815690250974,"planetary_lord":"Mars"},{"name":"Hora 24","start":"04:57","end":"05:57","startHours":28.942815690250974,"endHours":29.942815690250974,"planetary_lord":"Jupiter"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Puṣya","Aśleṣā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Rohiṇī","Mṛgaśirā","Ārdrā","Punarvasu","Hasta","Citrā","Svātī","Viśākhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Meṣa","Karka","Siṃha","Vṛścika","Dhanu","Kumbha"],"unfavorable_rashis":["Vṛṣabha","Mithuna","Kanyā","Tulā","Makara","Mīna"]},"dishaShool":"West (Paścim)","chandraVasa":"South","rahuVasa":"North-East","anandadiYoga":{"name":"Rākṣasa","quality":"Inauspicious"},"tropicalRitu":"Śarad (Autumn) (tropical)","vedicRitu":"Varṣā (Monsoon)","tropicalAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-6.923595493347793,"eotMinutes":13.986373996230075,"ayanamsa":23.5984}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Āśvina","lunar_month_paksha_full":"Āśvina Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Āśvina","lunar_month_amanta":"Āśvina","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Kanyā (Puraṭṭāsi)","ritu":"Śarad (Autumn)","display_summary":"Āśvina Śukla Trayodaśī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"pradosha-vrata","name":"Pradoṣa Vrata","name_sanskrit":"प्रदोष व्रत","tradition":"Shaiva","associated_deity":"Śiva","significance":"Twilight worship of Śiva on Trayodaśī.","vrata":true,"detection":{"any_of":[{"tithi_number":13},{"tithi_number":28}]},"precedence":7}],"todays_walk":{"walk":{"id":"surya-walk","name":"Sūrya Walk","name_sanskrit":"सूर्य यात्रा","type":"graha","description":"Self-illumination + BG 4.1 (Sun-lineage of Gītā transmission).","step_count":6,"url":"/walk/surya-walk"},"reason":"Ravivāra (Sunday) — 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 October 11, 1981 CE · Colombo, Sri Lanka · Vidhyamitra","description":"October 11, 1981 CE for Colombo, Sri Lanka: Śukla Trayodaśī, sūryodaya 05:57, sūryāsta 17:57.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/colombo/1981-10-11","hreflang_alternates":{"en":"https://vidhyamitra.com/city/colombo/1981-10-11","sa":"https://sa.vidhyamitra.com/city/colombo/1981-10-11","hi":"https://hi.vidhyamitra.com/city/colombo/1981-10-11","x-default":"https://vidhyamitra.com/city/colombo/1981-10-11"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-02T04:00:29.309Z","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":"2026-06-02T04:00:29.309Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-02T04:00:29.309Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}