{"id":"vidhyamitra:city-day:vrindavan:1981-02-01:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/vrindavan/1981-02-01","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-02-01","date_display":"February 1, 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":2,"day":1,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444636.770833,"kali_year":5082,"ahargana":1856171.2708,"sun":{"sidereal_longitude":288.5728,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":240.9906,"rashi":9,"rashi_name":"Dhanu"},"tithi":{"number":27,"name":"Dvādaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Dvādaśī","elongation_degrees":312.4178,"elapsed_within_tithi_degrees":0.4178},"nakshatra":{"number":19,"name":"Mūla","pada":1,"moon_longitude":240.9906,"elapsed_within_degrees":0.9906},"yoga":{"number":13,"name":"Vyāghāta","sum_longitude":169.5634},"karana":{"half_tithi_index":52,"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":2,"day":1,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444636.770833,"ahargana":1856171.2708,"kali_year":5082,"ayanamsa_lahiri":23.5888,"grahas":{"sun":{"sidereal_longitude":288.5093549999999,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":3},"retrograde":false},"moon":{"sidereal_longitude":241.33475499999997,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":1},"retrograde":false,"latitude":3.4519},"mars":{"sidereal_longitude":302.03965500000004,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":307.05585500000007,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":1},"retrograde":false},"jupiter":{"sidereal_longitude":166.770755,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":3},"retrograde":true},"venus":{"sidereal_longitude":272.671555,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":165.81035500000007,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":true},"rahu":{"sidereal_longitude":111.1135,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":291.1135,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","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":2,"day":1,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444636.770833,"kali_year":5082,"ahargana":1856171.2708,"sun":{"sidereal_longitude":288.5728,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":240.9906,"rashi":9,"rashi_name":"Dhanu"},"tithi":{"number":27,"name":"Dvādaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Dvādaśī","elongation_degrees":312.4178,"elapsed_within_tithi_degrees":0.4178},"nakshatra":{"number":19,"name":"Mūla","pada":1,"moon_longitude":240.9906,"elapsed_within_degrees":0.9906},"yoga":{"number":13,"name":"Vyāghāta","sum_longitude":169.5634},"karana":{"half_tithi_index":52,"name":"Kaulava"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":3.452,"elongation":47.582},"lunar":{"type":"lunar","occurs":false,"moon_latitude":3.452,"opposition_distance":132.418}},"eclipse_window_40days":[{"offset_days":-12,"type":"lunar","occurs":true,"moon_latitude":-1.332,"opposition_distance":1.776},{"offset_days":4,"type":"solar","occurs":true,"moon_latitude":-0.15,"elongation":0.162}]},"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":"07:06","sunsetLocal":"18:00","solarNoonLocal":"12:33","dayLengthHours":10.895537091507205,"dayLengthDisplay":"10 Hours 53 Mins 44 Secs","nightLengthDisplay":"13 Hours 06 Mins 16 Secs","moonriseLocal":"04:13","moonsetLocal":"14:35","rahuKala":{"name":"Rāhu Kāla","start":"16:38","end":"18:00","startHours":16.63669554460513,"endHours":17.99863768104353,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"12:33","end":"13:55","startHours":12.550869135289929,"endHours":13.91281127172833,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"15:16","end":"16:38","startHours":15.274753408166728,"endHours":16.63669554460513,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:39","end":"10:01","startHours":9.645392577554674,"endHours":10.00857714727158,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:33","end":"07:51","startHours":7.55708130168246,"endHours":7.847628957455985,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:11","end":"12:55","startHours":12.18768456557302,"endHours":12.914053705006834,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:39","end":"06:23","startHours":5.650362310668699,"endHours":6.376731450102512,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"06:12","end":"07:06","startHours":6.195139165244059,"endHours":7.103100589536326,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:22","end":"15:06","startHours":14.366791983874464,"endHours":15.093161123308278,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:48","end":"18:12","startHours":17.79863768104353,"endHours":18.19863768104353,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:00","end":"18:27","startHours":17.99863768104353,"endHours":18.452618393189663,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:45","end":"19:30","startHours":17.74863768104353,"endHours":19.49863768104353,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:11","end":"00:55","startHours":24.187684565573022,"endHours":24.914053705006836,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Udveg","start":"07:06","end":"08:28","startHours":7.103100589536326,"endHours":8.465042725974726,"quality":"inauspicious"},{"name":"Chala","start":"08:28","end":"09:50","startHours":8.465042725974726,"endHours":9.826984862413127,"quality":"neutral"},{"name":"Labha","start":"09:50","end":"11:11","startHours":9.826984862413127,"endHours":11.188926998851528,"quality":"auspicious"},{"name":"Amṛta","start":"11:11","end":"12:33","startHours":11.188926998851528,"endHours":12.550869135289929,"quality":"auspicious"},{"name":"Kāla","start":"12:33","end":"13:55","startHours":12.550869135289929,"endHours":13.91281127172833,"quality":"inauspicious"},{"name":"Śubha","start":"13:55","end":"15:16","startHours":13.91281127172833,"endHours":15.274753408166728,"quality":"auspicious"},{"name":"Roga","start":"15:16","end":"16:38","startHours":15.274753408166728,"endHours":16.63669554460513,"quality":"inauspicious"},{"name":"Udveg","start":"16:38","end":"18:00","startHours":16.63669554460513,"endHours":17.99863768104353,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Śubha","start":"18:00","end":"19:38","startHours":17.99863768104353,"endHours":19.63669554460513,"quality":"auspicious"},{"name":"Roga","start":"19:38","end":"21:16","startHours":19.63669554460513,"endHours":21.274753408166728,"quality":"inauspicious"},{"name":"Udveg","start":"21:16","end":"22:55","startHours":21.274753408166728,"endHours":22.91281127172833,"quality":"inauspicious"},{"name":"Chala","start":"22:55","end":"00:33","startHours":22.91281127172833,"endHours":24.55086913528993,"quality":"neutral"},{"name":"Labha","start":"00:33","end":"02:11","startHours":24.55086913528993,"endHours":26.188926998851528,"quality":"auspicious"},{"name":"Amṛta","start":"02:11","end":"03:50","startHours":26.188926998851528,"endHours":27.826984862413127,"quality":"auspicious"},{"name":"Kāla","start":"03:50","end":"05:28","startHours":27.826984862413127,"endHours":29.465042725974726,"quality":"inauspicious"},{"name":"Śubha","start":"05:28","end":"07:06","startHours":29.465042725974726,"endHours":31.103100589536325,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"07:06","end":"08:06","startHours":7.103100589536326,"endHours":8.103100589536325,"planetary_lord":"Sun"},{"name":"Hora 2","start":"08:06","end":"09:06","startHours":8.103100589536325,"endHours":9.103100589536325,"planetary_lord":"Mars"},{"name":"Hora 3","start":"09:06","end":"10:06","startHours":9.103100589536325,"endHours":10.103100589536325,"planetary_lord":"Jupiter"},{"name":"Hora 4","start":"10:06","end":"11:06","startHours":10.103100589536325,"endHours":11.103100589536325,"planetary_lord":"Saturn"},{"name":"Hora 5","start":"11:06","end":"12:06","startHours":11.103100589536325,"endHours":12.103100589536325,"planetary_lord":"Moon"},{"name":"Hora 6","start":"12:06","end":"13:06","startHours":12.103100589536325,"endHours":13.103100589536325,"planetary_lord":"Mercury"},{"name":"Hora 7","start":"13:06","end":"14:06","startHours":13.103100589536325,"endHours":14.103100589536325,"planetary_lord":"Venus"},{"name":"Hora 8","start":"14:06","end":"15:06","startHours":14.103100589536325,"endHours":15.103100589536325,"planetary_lord":"Sun"},{"name":"Hora 9","start":"15:06","end":"16:06","startHours":15.103100589536325,"endHours":16.103100589536325,"planetary_lord":"Mars"},{"name":"Hora 10","start":"16:06","end":"17:06","startHours":16.103100589536325,"endHours":17.103100589536325,"planetary_lord":"Jupiter"},{"name":"Hora 11","start":"17:06","end":"18:06","startHours":17.103100589536325,"endHours":18.103100589536325,"planetary_lord":"Saturn"},{"name":"Hora 12","start":"18:06","end":"19:06","startHours":18.103100589536325,"endHours":19.103100589536325,"planetary_lord":"Moon"},{"name":"Hora 13","start":"19:06","end":"20:06","startHours":19.103100589536325,"endHours":20.103100589536325,"planetary_lord":"Mercury"},{"name":"Hora 14","start":"20:06","end":"21:06","startHours":20.103100589536325,"endHours":21.103100589536325,"planetary_lord":"Venus"},{"name":"Hora 15","start":"21:06","end":"22:06","startHours":21.103100589536325,"endHours":22.103100589536325,"planetary_lord":"Sun"},{"name":"Hora 16","start":"22:06","end":"23:06","startHours":22.103100589536325,"endHours":23.103100589536325,"planetary_lord":"Mars"},{"name":"Hora 17","start":"23:06","end":"00:06","startHours":23.103100589536325,"endHours":24.103100589536325,"planetary_lord":"Jupiter"},{"name":"Hora 18","start":"00:06","end":"01:06","startHours":24.103100589536325,"endHours":25.103100589536325,"planetary_lord":"Saturn"},{"name":"Hora 19","start":"01:06","end":"02:06","startHours":25.103100589536325,"endHours":26.103100589536325,"planetary_lord":"Moon"},{"name":"Hora 20","start":"02:06","end":"03:06","startHours":26.103100589536325,"endHours":27.103100589536325,"planetary_lord":"Mercury"},{"name":"Hora 21","start":"03:06","end":"04:06","startHours":27.103100589536325,"endHours":28.103100589536325,"planetary_lord":"Venus"},{"name":"Hora 22","start":"04:06","end":"05:06","startHours":28.103100589536325,"endHours":29.103100589536325,"planetary_lord":"Sun"},{"name":"Hora 23","start":"05:06","end":"06:06","startHours":29.103100589536325,"endHours":30.103100589536325,"planetary_lord":"Mars"},{"name":"Hora 24","start":"06:06","end":"07:06","startHours":30.103100589536325,"endHours":31.103100589536325,"planetary_lord":"Jupiter"}],"taraBala":{"favorable_nakshatras":["Bharaṇī","Kṛttikā","Rohiṇī","Mṛgaśirā","Ārdrā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Citrā","Svātī","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj"],"unfavorable_nakshatras":["Aśvinī","Punarvasu","Puṣya","Aśleṣā","Maghā","Viśākhā","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Vṛṣabha","Mithuna","Kanyā","Tulā","Dhanu","Kumbha"],"unfavorable_rashis":["Meṣa","Karka","Siṃha","Vṛścika","Makara","Mīna"]},"dishaShool":"West (Paścim)","chandraVasa":"East","rahuVasa":"North-East","anandadiYoga":{"name":"Siddhi","quality":"Auspicious"},"drikRitu":"Śiśira (Winter) (Drik)","vedicRitu":"Hemanta (Pre-winter)","drikAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":-17.16452117423323,"eotMinutes":-13.689348117395623,"ayanamsa":23.5888}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Māgha","lunar_month_paksha_full":"Māgha Kṛṣṇa Pakṣa","solar_month":"Makara (Tai)","ritu":"Śiśira (Winter)","display_summary":"Māgha Kṛṣṇa Dvādaśī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"makara-sankranti","name":"Makara Saṅkrānti (Uttarāyaṇa)","name_sanskrit":"मकर सङ्क्रान्ति","tradition":"Pan-Hindu","associated_deity":"Sūrya Bhagavān","significance":"Sun enters Capricorn; Uttarāyaṇa (north-going) begins. Bhīṣma's chosen mahaprasthāna time.","vrata":true,"detection":{"sun_rashi":"Makara"},"precedence":1,"sources":["Mahābhārata Bhīṣma-Stuti","Sūrya-Siddhānta"]},{"id":"pongal","name":"Pongal / Thai Pongal","name_sanskrit":"पोङ्गल","tradition":"Regional","associated_deity":"Sūrya Bhagavān","significance":"Tamil 4-day harvest festival; coincides with Makara Saṅkrānti.","vrata":false,"detection":{"sun_rashi":"Makara"},"precedence":2}],"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":"vrindavan"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga February 1, 1981 CE · Vṛndāvana · Vidhyamitra","description":"February 1, 1981 CE for Vṛndāvana: Kṛṣṇa Dvādaśī, sūryodaya 07:06, sūryāsta 18:00.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/vrindavan/1981-02-01","hreflang_alternates":{"en":"https://vidhyamitra.com/city/vrindavan/1981-02-01","sa":"https://sa.vidhyamitra.com/city/vrindavan/1981-02-01","hi":"https://hi.vidhyamitra.com/city/vrindavan/1981-02-01","x-default":"https://vidhyamitra.com/city/vrindavan/1981-02-01"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-18T11:51:13.261Z","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":"2026-05-18T11:51:13.261Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-18T11:51:13.261Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}