{"id":"vidhyamitra:city-day:colombo:1981-05-13:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/colombo/1981-05-13","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-05-13","date_display":"May 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":5,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444737.770833,"kali_year":5083,"ahargana":1856272.2708,"sun":{"sidereal_longitude":28.6487,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":140.4045,"rashi":5,"rashi_name":"Siṃha"},"tithi":{"number":10,"name":"Daśamī","paksha":"Śukla","full_name":"Śukla Daśamī","elongation_degrees":111.7558,"elapsed_within_tithi_degrees":3.7558},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":3,"moon_longitude":140.4045,"elapsed_within_degrees":7.0711},"yoga":{"number":13,"name":"Vyāghāta","sum_longitude":169.0532},"karana":{"half_tithi_index":18,"name":"Taitila"},"vara":{"number":5,"name":"Budhavāra (Wednesday)"}},"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":5,"day":13,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444737.770833,"ahargana":1856272.2708,"kali_year":5083,"ayanamsa_lahiri":23.5926,"grahas":{"sun":{"sidereal_longitude":28.611597000000017,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":3,"name":"Kṛttikā","pada":1},"retrograde":false},"moon":{"sidereal_longitude":142.95909700000004,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":3},"retrograde":false,"latitude":2.5563},"mars":{"sidereal_longitude":19.835497000000032,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":2,"name":"Bharaṇī","pada":2},"retrograde":false},"mercury":{"sidereal_longitude":45.545897000000025,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":2},"retrograde":false},"jupiter":{"sidereal_longitude":157.33869700000002,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":true},"venus":{"sidereal_longitude":38.18359700000002,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":3,"name":"Kṛttikā","pada":4},"retrograde":false},"saturn":{"sidereal_longitude":159.61299699999995,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":true},"rahu":{"sidereal_longitude":105.7621,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":285.7621,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":2},"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":5,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444737.770833,"kali_year":5083,"ahargana":1856272.2708,"sun":{"sidereal_longitude":28.6487,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":140.4045,"rashi":5,"rashi_name":"Siṃha"},"tithi":{"number":10,"name":"Daśamī","paksha":"Śukla","full_name":"Śukla Daśamī","elongation_degrees":111.7558,"elapsed_within_tithi_degrees":3.7558},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":3,"moon_longitude":140.4045,"elapsed_within_degrees":7.0711},"yoga":{"number":13,"name":"Vyāghāta","sum_longitude":169.0532},"karana":{"half_tithi_index":18,"name":"Taitila"},"vara":{"number":5,"name":"Budhavāra (Wednesday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":2.556,"elongation":111.756},"lunar":{"type":"lunar","occurs":false,"moon_latitude":2.556,"opposition_distance":68.244}},"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":"05:54","sunsetLocal":"18:20","solarNoonLocal":"12:07","dayLengthHours":12.425344629313205,"dayLengthDisplay":"12 Hours 25 Mins 31 Secs","nightLengthDisplay":"11 Hours 34 Mins 29 Secs","moonriseLocal":"13:39","moonsetLocal":"01:49","rahuKala":{"name":"Rāhu Kāla","start":"12:07","end":"13:40","startHours":12.113362687607392,"endHours":13.666530766271542,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"07:27","end":"09:00","startHours":7.453858451614941,"endHours":9.007026530279092,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"10:34","end":"12:07","startHours":10.560194608943242,"endHours":12.113362687607392,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:48","end":"09:13","startHours":8.79993745312387,"endHours":9.214115607434312,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:25","end":"06:45","startHours":6.41841306583884,"endHours":6.749755589287193,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:42","end":"12:32","startHours":11.699184533296954,"endHours":12.527540841917833,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:15","end":"05:04","startHours":4.24397775570903,"endHours":5.07233406432991,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:52","end":"05:54","startHours":4.865244987174689,"endHours":5.90069037295079,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:11","end":"15:01","startHours":14.184253459159596,"endHours":15.012609767780477,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:08","end":"18:32","startHours":18.126035002263997,"endHours":18.526035002263995,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:20","end":"18:51","startHours":18.326035002263996,"endHours":18.843757695152046,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:05","end":"19:50","startHours":18.076035002263996,"endHours":19.826035002263996,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:42","end":"00:32","startHours":23.69918453329695,"endHours":24.527540841917833,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Labha","start":"05:54","end":"07:27","startHours":5.90069037295079,"endHours":7.453858451614941,"quality":"auspicious"},{"name":"Amṛta","start":"07:27","end":"09:00","startHours":7.453858451614941,"endHours":9.007026530279092,"quality":"auspicious"},{"name":"Kāla","start":"09:00","end":"10:34","startHours":9.007026530279092,"endHours":10.560194608943242,"quality":"inauspicious"},{"name":"Śubha","start":"10:34","end":"12:07","startHours":10.560194608943242,"endHours":12.113362687607392,"quality":"auspicious"},{"name":"Roga","start":"12:07","end":"13:40","startHours":12.113362687607392,"endHours":13.666530766271542,"quality":"inauspicious"},{"name":"Udveg","start":"13:40","end":"15:13","startHours":13.666530766271542,"endHours":15.219698844935696,"quality":"inauspicious"},{"name":"Chala","start":"15:13","end":"16:46","startHours":15.219698844935696,"endHours":16.772866923599846,"quality":"neutral"},{"name":"Labha","start":"16:46","end":"18:20","startHours":16.772866923599846,"endHours":18.326035002263996,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Udveg","start":"18:20","end":"19:46","startHours":18.326035002263996,"endHours":19.772866923599846,"quality":"inauspicious"},{"name":"Chala","start":"19:46","end":"21:13","startHours":19.772866923599846,"endHours":21.219698844935696,"quality":"neutral"},{"name":"Labha","start":"21:13","end":"22:40","startHours":21.219698844935696,"endHours":22.666530766271542,"quality":"auspicious"},{"name":"Amṛta","start":"22:40","end":"00:07","startHours":22.666530766271542,"endHours":24.113362687607392,"quality":"auspicious"},{"name":"Kāla","start":"00:07","end":"01:34","startHours":24.113362687607392,"endHours":25.56019460894324,"quality":"inauspicious"},{"name":"Śubha","start":"01:34","end":"03:00","startHours":25.56019460894324,"endHours":27.00702653027909,"quality":"auspicious"},{"name":"Roga","start":"03:00","end":"04:27","startHours":27.00702653027909,"endHours":28.45385845161494,"quality":"inauspicious"},{"name":"Udveg","start":"04:27","end":"05:54","startHours":28.45385845161494,"endHours":29.90069037295079,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"05:54","end":"06:54","startHours":5.90069037295079,"endHours":6.90069037295079,"planetary_lord":"Mercury"},{"name":"Hora 2","start":"06:54","end":"07:54","startHours":6.90069037295079,"endHours":7.90069037295079,"planetary_lord":"Venus"},{"name":"Hora 3","start":"07:54","end":"08:54","startHours":7.90069037295079,"endHours":8.900690372950791,"planetary_lord":"Sun"},{"name":"Hora 4","start":"08:54","end":"09:54","startHours":8.900690372950791,"endHours":9.900690372950791,"planetary_lord":"Mars"},{"name":"Hora 5","start":"09:54","end":"10:54","startHours":9.900690372950791,"endHours":10.900690372950791,"planetary_lord":"Jupiter"},{"name":"Hora 6","start":"10:54","end":"11:54","startHours":10.900690372950791,"endHours":11.900690372950791,"planetary_lord":"Saturn"},{"name":"Hora 7","start":"11:54","end":"12:54","startHours":11.900690372950791,"endHours":12.900690372950791,"planetary_lord":"Moon"},{"name":"Hora 8","start":"12:54","end":"13:54","startHours":12.900690372950791,"endHours":13.900690372950791,"planetary_lord":"Mercury"},{"name":"Hora 9","start":"13:54","end":"14:54","startHours":13.900690372950791,"endHours":14.900690372950791,"planetary_lord":"Venus"},{"name":"Hora 10","start":"14:54","end":"15:54","startHours":14.900690372950791,"endHours":15.900690372950791,"planetary_lord":"Sun"},{"name":"Hora 11","start":"15:54","end":"16:54","startHours":15.900690372950791,"endHours":16.90069037295079,"planetary_lord":"Mars"},{"name":"Hora 12","start":"16:54","end":"17:54","startHours":16.90069037295079,"endHours":17.90069037295079,"planetary_lord":"Jupiter"},{"name":"Hora 13","start":"17:54","end":"18:54","startHours":17.90069037295079,"endHours":18.90069037295079,"planetary_lord":"Saturn"},{"name":"Hora 14","start":"18:54","end":"19:54","startHours":18.90069037295079,"endHours":19.90069037295079,"planetary_lord":"Moon"},{"name":"Hora 15","start":"19:54","end":"20:54","startHours":19.90069037295079,"endHours":20.90069037295079,"planetary_lord":"Mercury"},{"name":"Hora 16","start":"20:54","end":"21:54","startHours":20.90069037295079,"endHours":21.90069037295079,"planetary_lord":"Venus"},{"name":"Hora 17","start":"21:54","end":"22:54","startHours":21.90069037295079,"endHours":22.90069037295079,"planetary_lord":"Sun"},{"name":"Hora 18","start":"22:54","end":"23:54","startHours":22.90069037295079,"endHours":23.90069037295079,"planetary_lord":"Mars"},{"name":"Hora 19","start":"23:54","end":"00:54","startHours":23.90069037295079,"endHours":24.90069037295079,"planetary_lord":"Jupiter"},{"name":"Hora 20","start":"00:54","end":"01:54","startHours":24.90069037295079,"endHours":25.90069037295079,"planetary_lord":"Saturn"},{"name":"Hora 21","start":"01:54","end":"02:54","startHours":25.90069037295079,"endHours":26.90069037295079,"planetary_lord":"Moon"},{"name":"Hora 22","start":"02:54","end":"03:54","startHours":26.90069037295079,"endHours":27.90069037295079,"planetary_lord":"Mercury"},{"name":"Hora 23","start":"03:54","end":"04:54","startHours":27.90069037295079,"endHours":28.90069037295079,"planetary_lord":"Venus"},{"name":"Hora 24","start":"04:54","end":"05:54","startHours":28.90069037295079,"endHours":29.90069037295079,"planetary_lord":"Sun"}],"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":"North (Uttara)","chandraVasa":"West","rahuVasa":"South-West","anandadiYoga":{"name":"Gada","quality":"Inauspicious"},"tropicalRitu":"Vasanta (Spring) (tropical)","vedicRitu":"Vasanta (Spring)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":18.317845637567157,"eotMinutes":3.7534387435564067,"ayanamsa":23.5926}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Vaiśākha","lunar_month_paksha_full":"Vaiśākha Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Vaiśākha","lunar_month_amanta":"Vaiśākha","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Mēsha (Cittirai / Vaiśākhī)","ritu":"Vasanta (Spring)","display_summary":"Vaiśākha Śukla Daśamī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[],"todays_walk":{"walk":{"id":"budha-walk","name":"Budha Walk","name_sanskrit":"बुध यात्रा","type":"graha","description":"Discrimination + BG 2.41 (vyavasāyātmikā buddhi).","step_count":6,"url":"/walk/budha-walk"},"reason":"Budhavāra (Wednesday) — 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 May 13, 1981 CE · Colombo, Sri Lanka · Vidhyamitra","description":"May 13, 1981 CE for Colombo, Sri Lanka: Śukla Daśamī, sūryodaya 05:54, sūryāsta 18:20.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/colombo/1981-05-13","hreflang_alternates":{"en":"https://vidhyamitra.com/city/colombo/1981-05-13","sa":"https://sa.vidhyamitra.com/city/colombo/1981-05-13","hi":"https://hi.vidhyamitra.com/city/colombo/1981-05-13","x-default":"https://vidhyamitra.com/city/colombo/1981-05-13"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-02T01:30:10.524Z","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":"2026-06-02T01:30:10.524Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-02T01:30:10.524Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}