{"id":"vidhyamitra:city-day:vrindavan:1981-10-21:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/vrindavan/1981-10-21","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-10-21","date_display":"October 21, 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":21,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444898.770833,"kali_year":5083,"ahargana":1856433.2708,"sun":{"sidereal_longitude":183.2849,"rashi":7,"rashi_name":"Tulā"},"moon":{"sidereal_longitude":101.7807,"rashi":4,"rashi_name":"Karka"},"tithi":{"number":24,"name":"Navamī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Navamī","elongation_degrees":278.4958,"elapsed_within_tithi_degrees":2.4958},"nakshatra":{"number":8,"name":"Puṣya","pada":3,"moon_longitude":101.7807,"elapsed_within_degrees":8.4474},"yoga":{"number":22,"name":"Sādhya","sum_longitude":285.0656},"karana":{"half_tithi_index":46,"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":10,"day":21,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444898.770833,"ahargana":1856433.2708,"kali_year":5083,"ayanamsa_lahiri":23.5988,"grahas":{"sun":{"sidereal_longitude":183.96124499999996,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":14,"name":"Citrā","pada":4},"retrograde":false},"moon":{"sidereal_longitude":105.048745,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":4},"retrograde":false,"latitude":0.3566},"mars":{"sidereal_longitude":126.62834499999997,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":2},"retrograde":false},"mercury":{"sidereal_longitude":178.73704499999997,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":2},"retrograde":true},"jupiter":{"sidereal_longitude":179.00744499999996,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":2},"retrograde":false},"venus":{"sidereal_longitude":230.13394500000004,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":18,"name":"Jyeṣṭhā","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":170.74344499999995,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":4},"retrograde":false},"rahu":{"sidereal_longitude":97.2315,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":277.2315,"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":21,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444898.770833,"kali_year":5083,"ahargana":1856433.2708,"sun":{"sidereal_longitude":183.2849,"rashi":7,"rashi_name":"Tulā"},"moon":{"sidereal_longitude":101.7807,"rashi":4,"rashi_name":"Karka"},"tithi":{"number":24,"name":"Navamī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Navamī","elongation_degrees":278.4958,"elapsed_within_tithi_degrees":2.4958},"nakshatra":{"number":8,"name":"Puṣya","pada":3,"moon_longitude":101.7807,"elapsed_within_degrees":8.4474},"yoga":{"number":22,"name":"Sādhya","sum_longitude":285.0656},"karana":{"half_tithi_index":46,"name":"Taitila"},"vara":{"number":5,"name":"Budhavāra (Wednesday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":0.357,"elongation":81.504},"lunar":{"type":"lunar","occurs":false,"moon_latitude":0.357,"opposition_distance":98.496}},"eclipse_window_40days":[]},"city":{"slug":"vrindavan","name":"Vṛndāvana","lat":27.565,"lon":77.6593,"tz_offset_hours":5.5,"state":"Uttar Pradesh","country":"IN","tier":"tirtha"},"tier2":{"city":{"slug":"vrindavan","name":"Vṛndāvana","lat":27.565,"lon":77.6593,"tz_offset_hours":5.5,"state":"Uttar Pradesh","country":"IN","tier":"tirtha"},"sunriseLocal":"06:22","sunsetLocal":"17:45","solarNoonLocal":"12:04","dayLengthHours":11.380176437003229,"dayLengthDisplay":"11 Hours 22 Mins 49 Secs","nightLengthDisplay":"12 Hours 37 Mins 11 Secs","moonriseLocal":"00:06","moonsetLocal":"13:30","rahuKala":{"name":"Rāhu Kāla","start":"12:04","end":"13:29","startHours":12.058889657221588,"endHours":13.481411711846992,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"07:47","end":"09:13","startHours":7.791323493345376,"endHours":9.21384554797078,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"10:38","end":"12:04","startHours":10.636367602596184,"endHours":12.058889657221588,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:01","end":"09:24","startHours":9.024175940687392,"endHours":9.403515155254167,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:51","end":"07:09","startHours":6.842975456928441,"endHours":7.14644682858186,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:41","end":"12:26","startHours":11.679550442654813,"endHours":12.438228871788363,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:51","end":"05:37","startHours":4.851444580452876,"endHours":5.610123009586424,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:25","end":"06:22","startHours":5.420453402303037,"endHours":6.368801438719973,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"13:57","end":"14:43","startHours":13.955585730055457,"endHours":14.714264159189005,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:33","end":"17:57","startHours":17.548977875723203,"endHours":17.9489778757232,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:45","end":"18:13","startHours":17.748977875723202,"endHours":18.22315189393167,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:30","end":"19:15","startHours":17.498977875723202,"endHours":19.248977875723202,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:41","end":"00:26","startHours":23.679550442654815,"endHours":24.43822887178836,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Labha","start":"06:22","end":"07:47","startHours":6.368801438719973,"endHours":7.791323493345376,"quality":"auspicious"},{"name":"Amṛta","start":"07:47","end":"09:13","startHours":7.791323493345376,"endHours":9.21384554797078,"quality":"auspicious"},{"name":"Kāla","start":"09:13","end":"10:38","startHours":9.21384554797078,"endHours":10.636367602596184,"quality":"inauspicious"},{"name":"Śubha","start":"10:38","end":"12:04","startHours":10.636367602596184,"endHours":12.058889657221588,"quality":"auspicious"},{"name":"Roga","start":"12:04","end":"13:29","startHours":12.058889657221588,"endHours":13.481411711846992,"quality":"inauspicious"},{"name":"Udveg","start":"13:29","end":"14:54","startHours":13.481411711846992,"endHours":14.903933766472395,"quality":"inauspicious"},{"name":"Chala","start":"14:54","end":"16:20","startHours":14.903933766472395,"endHours":16.3264558210978,"quality":"neutral"},{"name":"Labha","start":"16:20","end":"17:45","startHours":16.3264558210978,"endHours":17.748977875723202,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Udveg","start":"17:45","end":"19:20","startHours":17.748977875723202,"endHours":19.3264558210978,"quality":"inauspicious"},{"name":"Chala","start":"19:20","end":"20:54","startHours":19.3264558210978,"endHours":20.903933766472395,"quality":"neutral"},{"name":"Labha","start":"20:54","end":"22:29","startHours":20.903933766472395,"endHours":22.48141171184699,"quality":"auspicious"},{"name":"Amṛta","start":"22:29","end":"00:04","startHours":22.48141171184699,"endHours":24.058889657221588,"quality":"auspicious"},{"name":"Kāla","start":"00:04","end":"01:38","startHours":24.058889657221588,"endHours":25.636367602596184,"quality":"inauspicious"},{"name":"Śubha","start":"01:38","end":"03:13","startHours":25.636367602596184,"endHours":27.21384554797078,"quality":"auspicious"},{"name":"Roga","start":"03:13","end":"04:47","startHours":27.21384554797078,"endHours":28.791323493345377,"quality":"inauspicious"},{"name":"Udveg","start":"04:47","end":"06:22","startHours":28.791323493345377,"endHours":30.368801438719974,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"06:22","end":"07:22","startHours":6.368801438719973,"endHours":7.368801438719973,"planetary_lord":"Mercury"},{"name":"Hora 2","start":"07:22","end":"08:22","startHours":7.368801438719973,"endHours":8.368801438719974,"planetary_lord":"Venus"},{"name":"Hora 3","start":"08:22","end":"09:22","startHours":8.368801438719974,"endHours":9.368801438719974,"planetary_lord":"Sun"},{"name":"Hora 4","start":"09:22","end":"10:22","startHours":9.368801438719974,"endHours":10.368801438719974,"planetary_lord":"Mars"},{"name":"Hora 5","start":"10:22","end":"11:22","startHours":10.368801438719974,"endHours":11.368801438719974,"planetary_lord":"Jupiter"},{"name":"Hora 6","start":"11:22","end":"12:22","startHours":11.368801438719974,"endHours":12.368801438719974,"planetary_lord":"Saturn"},{"name":"Hora 7","start":"12:22","end":"13:22","startHours":12.368801438719974,"endHours":13.368801438719974,"planetary_lord":"Moon"},{"name":"Hora 8","start":"13:22","end":"14:22","startHours":13.368801438719974,"endHours":14.368801438719974,"planetary_lord":"Mercury"},{"name":"Hora 9","start":"14:22","end":"15:22","startHours":14.368801438719974,"endHours":15.368801438719974,"planetary_lord":"Venus"},{"name":"Hora 10","start":"15:22","end":"16:22","startHours":15.368801438719974,"endHours":16.368801438719974,"planetary_lord":"Sun"},{"name":"Hora 11","start":"16:22","end":"17:22","startHours":16.368801438719974,"endHours":17.368801438719974,"planetary_lord":"Mars"},{"name":"Hora 12","start":"17:22","end":"18:22","startHours":17.368801438719974,"endHours":18.368801438719974,"planetary_lord":"Jupiter"},{"name":"Hora 13","start":"18:22","end":"19:22","startHours":18.368801438719974,"endHours":19.368801438719974,"planetary_lord":"Saturn"},{"name":"Hora 14","start":"19:22","end":"20:22","startHours":19.368801438719974,"endHours":20.368801438719974,"planetary_lord":"Moon"},{"name":"Hora 15","start":"20:22","end":"21:22","startHours":20.368801438719974,"endHours":21.368801438719974,"planetary_lord":"Mercury"},{"name":"Hora 16","start":"21:22","end":"22:22","startHours":21.368801438719974,"endHours":22.368801438719974,"planetary_lord":"Venus"},{"name":"Hora 17","start":"22:22","end":"23:22","startHours":22.368801438719974,"endHours":23.368801438719974,"planetary_lord":"Sun"},{"name":"Hora 18","start":"23:22","end":"00:22","startHours":23.368801438719974,"endHours":24.368801438719974,"planetary_lord":"Mars"},{"name":"Hora 19","start":"00:22","end":"01:22","startHours":24.368801438719974,"endHours":25.368801438719974,"planetary_lord":"Jupiter"},{"name":"Hora 20","start":"01:22","end":"02:22","startHours":25.368801438719974,"endHours":26.368801438719974,"planetary_lord":"Saturn"},{"name":"Hora 21","start":"02:22","end":"03:22","startHours":26.368801438719974,"endHours":27.368801438719974,"planetary_lord":"Moon"},{"name":"Hora 22","start":"03:22","end":"04:22","startHours":27.368801438719974,"endHours":28.368801438719974,"planetary_lord":"Mercury"},{"name":"Hora 23","start":"04:22","end":"05:22","startHours":28.368801438719974,"endHours":29.368801438719974,"planetary_lord":"Venus"},{"name":"Hora 24","start":"05:22","end":"06:22","startHours":29.368801438719974,"endHours":30.368801438719974,"planetary_lord":"Sun"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Rohiṇī","Aśleṣā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Revatī"],"unfavorable_nakshatras":["Mṛgaśirā","Ārdrā","Punarvasu","Puṣya","Citrā","Svātī","Viśākhā","Anurādhā","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Meṣa","Vṛṣabha","Karka","Kanyā","Dhanu","Makara"],"unfavorable_rashis":["Mithuna","Siṃha","Tulā","Vṛścika","Kumbha","Mīna"]},"dishaShool":"North (Uttara)","chandraVasa":"South-West","rahuVasa":"South-West","anandadiYoga":{"name":"Śubha","quality":"Auspicious"},"drikRitu":"Śarad (Autumn)","vedicRitu":"Śarad (Autumn)","drikAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":-10.604120110199053,"eotMinutes":15.829420566704727,"ayanamsa":23.5988}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Kārtika","lunar_month_paksha_full":"Kārtika Kṛṣṇa Pakṣa","solar_month":"Tulā (Aippasi)","ritu":"Śarad (Autumn)","display_summary":"Kārtika Kṛṣṇa Navamī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"tula-sankranti","name":"Tulā Saṅkrānti","name_sanskrit":"तुला सङ्क्रान्ति","tradition":"Pan-Hindu","significance":"Sun enters Libra.","vrata":false,"detection":{"sun_rashi":"Tulā"},"precedence":5}],"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":"vrindavan"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga October 21, 1981 CE · Vṛndāvana · Vidhyamitra","description":"October 21, 1981 CE for Vṛndāvana: Kṛṣṇa Navamī, sūryodaya 06:22, sūryāsta 17:45.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/vrindavan/1981-10-21","hreflang_alternates":{"en":"https://vidhyamitra.com/city/vrindavan/1981-10-21","sa":"https://sa.vidhyamitra.com/city/vrindavan/1981-10-21","hi":"https://hi.vidhyamitra.com/city/vrindavan/1981-10-21","x-default":"https://vidhyamitra.com/city/vrindavan/1981-10-21"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-19T20:44:38.536Z","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":"2026-05-19T20:44:38.536Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-19T20:44:38.536Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}