{"id":"vidhyamitra:city-day:vellore:1981-12-13:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/vellore/1981-12-13","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-12-13","date_display":"December 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":12,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444951.770833,"kali_year":5083,"ahargana":1856486.2708,"sun":{"sidereal_longitude":236.9856,"rashi":8,"rashi_name":"Vṛścika"},"moon":{"sidereal_longitude":79.4444,"rashi":3,"rashi_name":"Mithuna"},"tithi":{"number":17,"name":"Dvitīyā","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Dvitīyā","elongation_degrees":202.4588,"elapsed_within_tithi_degrees":10.4588},"nakshatra":{"number":6,"name":"Ārdrā","pada":4,"moon_longitude":79.4444,"elapsed_within_degrees":12.7777},"yoga":{"number":24,"name":"Śukla","sum_longitude":316.43},"karana":{"half_tithi_index":33,"name":"Gara"},"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":12,"day":13,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444951.770833,"ahargana":1856486.2708,"kali_year":5083,"ayanamsa_lahiri":23.6008,"grahas":{"sun":{"sidereal_longitude":237.34381999999994,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":18,"name":"Jyeṣṭhā","pada":4},"retrograde":false},"moon":{"sidereal_longitude":81.00382000000002,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":7,"name":"Punarvasu","pada":1},"retrograde":false,"latitude":-1.162},"mars":{"sidereal_longitude":155.21101999999996,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":238.92941999999994,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":18,"name":"Jyeṣṭhā","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":189.80251999999996,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":1},"retrograde":false},"venus":{"sidereal_longitude":279.3609200000001,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":4},"retrograde":false},"saturn":{"sidereal_longitude":176.29422,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":1},"retrograde":false},"rahu":{"sidereal_longitude":94.4233,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":274.4233,"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":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444951.770833,"kali_year":5083,"ahargana":1856486.2708,"sun":{"sidereal_longitude":236.9856,"rashi":8,"rashi_name":"Vṛścika"},"moon":{"sidereal_longitude":79.4444,"rashi":3,"rashi_name":"Mithuna"},"tithi":{"number":17,"name":"Dvitīyā","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Dvitīyā","elongation_degrees":202.4588,"elapsed_within_tithi_degrees":10.4588},"nakshatra":{"number":6,"name":"Ārdrā","pada":4,"moon_longitude":79.4444,"elapsed_within_degrees":12.7777},"yoga":{"number":24,"name":"Śukla","sum_longitude":316.43},"karana":{"half_tithi_index":33,"name":"Gara"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-1.162,"elongation":157.541},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-1.162,"opposition_distance":22.459}},"eclipse_window_40days":[]},"city":{"slug":"vellore","name":"Vellore, Tamil Nadu","lat":12.9165,"lon":79.1325,"tz_offset_hours":5.5,"state":"Tamil Nadu","country":"IN","tier":"tier-1"},"tier2":{"city":{"slug":"vellore","name":"Vellore, Tamil Nadu","lat":12.9165,"lon":79.1325,"tz_offset_hours":5.5,"state":"Tamil Nadu","country":"IN","tier":"tier-1"},"sunriseLocal":"06:27","sunsetLocal":"17:50","solarNoonLocal":"12:08","dayLengthHours":11.374936462385513,"dayLengthDisplay":"11 Hours 22 Mins 30 Secs","nightLengthDisplay":"12 Hours 37 Mins 30 Secs","moonriseLocal":"19:18","moonsetLocal":"08:08","rahuKala":{"name":"Rāhu Kāla","start":"16:24","end":"17:50","startHours":16.405257002570934,"endHours":17.827124060369123,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"12:08","end":"13:34","startHours":12.139655829176366,"endHours":13.561522886974554,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"14:59","end":"16:24","startHours":14.983389944772743,"endHours":16.405257002570934,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:06","end":"09:29","startHours":9.106339439206895,"endHours":9.485503987953079,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:56","end":"07:14","startHours":6.926143283916338,"endHours":7.229474922913285,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:46","end":"12:31","startHours":11.760491280430182,"endHours":12.51882037792255,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:56","end":"05:42","startHours":4.935529402998874,"endHours":5.693858500491241,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:30","end":"06:27","startHours":5.504276226118149,"endHours":6.452187597983609,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:02","end":"14:48","startHours":14.035478572907284,"endHours":14.793807670399651,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:38","end":"18:02","startHours":17.627124060369123,"endHours":18.027124060369122,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:50","end":"18:18","startHours":17.827124060369123,"endHours":18.301079746301852,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:35","end":"19:20","startHours":17.577124060369123,"endHours":19.327124060369123,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:46","end":"00:31","startHours":23.760491280430184,"endHours":24.518820377922548,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Udveg","start":"06:27","end":"07:52","startHours":6.452187597983609,"endHours":7.874054655781798,"quality":"inauspicious"},{"name":"Chala","start":"07:52","end":"09:18","startHours":7.874054655781798,"endHours":9.295921713579986,"quality":"neutral"},{"name":"Labha","start":"09:18","end":"10:43","startHours":9.295921713579986,"endHours":10.717788771378176,"quality":"auspicious"},{"name":"Amṛta","start":"10:43","end":"12:08","startHours":10.717788771378176,"endHours":12.139655829176366,"quality":"auspicious"},{"name":"Kāla","start":"12:08","end":"13:34","startHours":12.139655829176366,"endHours":13.561522886974554,"quality":"inauspicious"},{"name":"Śubha","start":"13:34","end":"14:59","startHours":13.561522886974554,"endHours":14.983389944772743,"quality":"auspicious"},{"name":"Roga","start":"14:59","end":"16:24","startHours":14.983389944772743,"endHours":16.405257002570934,"quality":"inauspicious"},{"name":"Udveg","start":"16:24","end":"17:50","startHours":16.405257002570934,"endHours":17.827124060369123,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Śubha","start":"17:50","end":"19:24","startHours":17.827124060369123,"endHours":19.405257002570934,"quality":"auspicious"},{"name":"Roga","start":"19:24","end":"20:59","startHours":19.405257002570934,"endHours":20.983389944772746,"quality":"inauspicious"},{"name":"Udveg","start":"20:59","end":"22:34","startHours":20.983389944772746,"endHours":22.561522886974554,"quality":"inauspicious"},{"name":"Chala","start":"22:34","end":"00:08","startHours":22.561522886974554,"endHours":24.139655829176366,"quality":"neutral"},{"name":"Labha","start":"00:08","end":"01:43","startHours":24.139655829176366,"endHours":25.717788771378178,"quality":"auspicious"},{"name":"Amṛta","start":"01:43","end":"03:18","startHours":25.717788771378178,"endHours":27.295921713579986,"quality":"auspicious"},{"name":"Kāla","start":"03:18","end":"04:52","startHours":27.295921713579986,"endHours":28.874054655781798,"quality":"inauspicious"},{"name":"Śubha","start":"04:52","end":"06:27","startHours":28.874054655781798,"endHours":30.45218759798361,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"06:27","end":"07:27","startHours":6.452187597983609,"endHours":7.452187597983609,"planetary_lord":"Sun"},{"name":"Hora 2","start":"07:27","end":"08:27","startHours":7.452187597983609,"endHours":8.45218759798361,"planetary_lord":"Mars"},{"name":"Hora 3","start":"08:27","end":"09:27","startHours":8.45218759798361,"endHours":9.45218759798361,"planetary_lord":"Jupiter"},{"name":"Hora 4","start":"09:27","end":"10:27","startHours":9.45218759798361,"endHours":10.45218759798361,"planetary_lord":"Saturn"},{"name":"Hora 5","start":"10:27","end":"11:27","startHours":10.45218759798361,"endHours":11.45218759798361,"planetary_lord":"Moon"},{"name":"Hora 6","start":"11:27","end":"12:27","startHours":11.45218759798361,"endHours":12.45218759798361,"planetary_lord":"Mercury"},{"name":"Hora 7","start":"12:27","end":"13:27","startHours":12.45218759798361,"endHours":13.45218759798361,"planetary_lord":"Venus"},{"name":"Hora 8","start":"13:27","end":"14:27","startHours":13.45218759798361,"endHours":14.45218759798361,"planetary_lord":"Sun"},{"name":"Hora 9","start":"14:27","end":"15:27","startHours":14.45218759798361,"endHours":15.45218759798361,"planetary_lord":"Mars"},{"name":"Hora 10","start":"15:27","end":"16:27","startHours":15.45218759798361,"endHours":16.45218759798361,"planetary_lord":"Jupiter"},{"name":"Hora 11","start":"16:27","end":"17:27","startHours":16.45218759798361,"endHours":17.45218759798361,"planetary_lord":"Saturn"},{"name":"Hora 12","start":"17:27","end":"18:27","startHours":17.45218759798361,"endHours":18.45218759798361,"planetary_lord":"Moon"},{"name":"Hora 13","start":"18:27","end":"19:27","startHours":18.45218759798361,"endHours":19.45218759798361,"planetary_lord":"Mercury"},{"name":"Hora 14","start":"19:27","end":"20:27","startHours":19.45218759798361,"endHours":20.45218759798361,"planetary_lord":"Venus"},{"name":"Hora 15","start":"20:27","end":"21:27","startHours":20.45218759798361,"endHours":21.45218759798361,"planetary_lord":"Sun"},{"name":"Hora 16","start":"21:27","end":"22:27","startHours":21.45218759798361,"endHours":22.45218759798361,"planetary_lord":"Mars"},{"name":"Hora 17","start":"22:27","end":"23:27","startHours":22.45218759798361,"endHours":23.45218759798361,"planetary_lord":"Jupiter"},{"name":"Hora 18","start":"23:27","end":"00:27","startHours":23.45218759798361,"endHours":24.45218759798361,"planetary_lord":"Saturn"},{"name":"Hora 19","start":"00:27","end":"01:27","startHours":24.45218759798361,"endHours":25.45218759798361,"planetary_lord":"Moon"},{"name":"Hora 20","start":"01:27","end":"02:27","startHours":25.45218759798361,"endHours":26.45218759798361,"planetary_lord":"Mercury"},{"name":"Hora 21","start":"02:27","end":"03:27","startHours":26.45218759798361,"endHours":27.45218759798361,"planetary_lord":"Venus"},{"name":"Hora 22","start":"03:27","end":"04:27","startHours":27.45218759798361,"endHours":28.45218759798361,"planetary_lord":"Sun"},{"name":"Hora 23","start":"04:27","end":"05:27","startHours":28.45218759798361,"endHours":29.45218759798361,"planetary_lord":"Mars"},{"name":"Hora 24","start":"05:27","end":"06:27","startHours":29.45218759798361,"endHours":30.45218759798361,"planetary_lord":"Jupiter"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Punarvasu","Puṣya","Aśleṣā","Maghā","Pūrva Phalgunī","Viśākhā","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Kṛttikā","Rohiṇī","Mṛgaśirā","Ārdrā","Uttara Phalgunī","Hasta","Citrā","Svātī","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Meṣa","Mithuna","Siṃha","Vṛścika","Dhanu","Mīna"],"unfavorable_rashis":["Vṛṣabha","Karka","Kanyā","Tulā","Makara","Kumbha"]},"dishaShool":"West (Paścim)","chandraVasa":"South","rahuVasa":"North-East","anandadiYoga":{"name":"Dhvānkṣa","quality":"Inauspicious"},"tropicalRitu":"Hemanta (Pre-winter) (tropical)","vedicRitu":"Śarad (Autumn)","tropicalAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-23.12730302270558,"eotMinutes":5.090650249418121,"ayanamsa":23.6008}},"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":"Vṛścika (Kārttikai)","ritu":"Hemanta (Pre-winter)","display_summary":"Pauṣa Kṛṣṇa Dvitīyā · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[],"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":"vellore"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga December 13, 1981 CE · Vellore, Tamil Nadu · Vidhyamitra","description":"December 13, 1981 CE for Vellore, Tamil Nadu: Kṛṣṇa Dvitīyā, sūryodaya 06:27, sūryāsta 17:50.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/vellore/1981-12-13","hreflang_alternates":{"en":"https://vidhyamitra.com/city/vellore/1981-12-13","sa":"https://sa.vidhyamitra.com/city/vellore/1981-12-13","hi":"https://hi.vidhyamitra.com/city/vellore/1981-12-13","x-default":"https://vidhyamitra.com/city/vellore/1981-12-13"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-02T04:23:36.835Z","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":"2026-06-02T04:23:36.835Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-02T04:23:36.835Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}