{"id":"vidhyamitra:city-day:howrah:1981-04-18:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/howrah/1981-04-18","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-04-18","date_display":"April 18, 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":4,"day":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444712.770833,"kali_year":5083,"ahargana":1856247.2708,"sun":{"sidereal_longitude":4.498,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":170.6426,"rashi":6,"rashi_name":"Kanyā"},"tithi":{"number":14,"name":"Caturdaśī","paksha":"Śukla","full_name":"Śukla Caturdaśī","elongation_degrees":166.1446,"elapsed_within_tithi_degrees":10.1446},"nakshatra":{"number":13,"name":"Hasta","pada":4,"moon_longitude":170.6426,"elapsed_within_degrees":10.6426},"yoga":{"number":14,"name":"Harṣaṇa","sum_longitude":175.1407},"karana":{"half_tithi_index":27,"name":"Vaṇija"},"vara":{"number":1,"name":"Śanivāra (Saturday)"}},"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":4,"day":18,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444712.770833,"ahargana":1856247.2708,"kali_year":5083,"ayanamsa_lahiri":23.5917,"grahas":{"sun":{"sidereal_longitude":4.33675199999999,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":2},"retrograde":false},"moon":{"sidereal_longitude":170.18495200000007,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":4},"retrograde":false,"latitude":4.0283},"mars":{"sidereal_longitude":1.1870519999999942,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":1},"retrograde":false},"mercury":{"sidereal_longitude":354.070152,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":3},"retrograde":false},"jupiter":{"sidereal_longitude":159.24335199999996,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":true},"venus":{"sidereal_longitude":7.363051999999982,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":160.98885199999995,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":107.0867,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":287.0867,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","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":4,"day":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444712.770833,"kali_year":5083,"ahargana":1856247.2708,"sun":{"sidereal_longitude":4.498,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":170.6426,"rashi":6,"rashi_name":"Kanyā"},"tithi":{"number":14,"name":"Caturdaśī","paksha":"Śukla","full_name":"Śukla Caturdaśī","elongation_degrees":166.1446,"elapsed_within_tithi_degrees":10.1446},"nakshatra":{"number":13,"name":"Hasta","pada":4,"moon_longitude":170.6426,"elapsed_within_degrees":10.6426},"yoga":{"number":14,"name":"Harṣaṇa","sum_longitude":175.1407},"karana":{"half_tithi_index":27,"name":"Vaṇija"},"vara":{"number":1,"name":"Śanivāra (Saturday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":4.028,"elongation":166.145},"lunar":{"type":"lunar","occurs":false,"moon_latitude":4.028,"opposition_distance":13.855}},"eclipse_window_40days":[]},"city":{"slug":"howrah","name":"Howrah, West Bengal","lat":22.5958,"lon":88.2636,"tz_offset_hours":5.5,"state":"West Bengal","country":"IN","tier":"tier-1"},"tier2":{"city":{"slug":"howrah","name":"Howrah, West Bengal","lat":22.5958,"lon":88.2636,"tz_offset_hours":5.5,"state":"West Bengal","country":"IN","tier":"tier-1"},"sunriseLocal":"05:15","sunsetLocal":"17:58","solarNoonLocal":"11:36","dayLengthHours":12.726349401814154,"dayLengthDisplay":"12 Hours 43 Mins 35 Secs","nightLengthDisplay":"11 Hours 16 Mins 25 Secs","moonriseLocal":"16:46","moonsetLocal":"04:33","rahuKala":{"name":"Rāhu Kāla","start":"08:26","end":"10:01","startHours":8.425741267948403,"endHours":10.016534943175174,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"13:12","end":"14:47","startHours":13.198122293628712,"endHours":14.78891596885548,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"05:15","end":"06:50","startHours":5.244153917494866,"endHours":6.834947592721635,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:13","end":"08:38","startHours":8.213635444584835,"endHours":8.637847091311974,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"05:46","end":"06:07","startHours":5.774418475903789,"endHours":6.1137877932855,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:11","end":"12:02","startHours":11.183116971674805,"endHours":12.031540265129083,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:33","end":"04:24","startHours":3.547307330586312,"endHours":4.3957306240405885,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:11","end":"05:15","startHours":4.18362480067702,"endHours":5.244153917494866,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"13:44","end":"14:35","startHours":13.728386852037634,"endHours":14.57681014549191,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:46","end":"18:10","startHours":17.77050331930902,"endHours":18.17050331930902,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:58","end":"18:30","startHours":17.97050331930902,"endHours":18.500767877717944,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:43","end":"19:28","startHours":17.72050331930902,"endHours":19.47050331930902,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:11","end":"00:02","startHours":23.183116971674806,"endHours":24.03154026512908,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Kāla","start":"05:15","end":"06:50","startHours":5.244153917494866,"endHours":6.834947592721635,"quality":"inauspicious"},{"name":"Śubha","start":"06:50","end":"08:26","startHours":6.834947592721635,"endHours":8.425741267948403,"quality":"auspicious"},{"name":"Roga","start":"08:26","end":"10:01","startHours":8.425741267948403,"endHours":10.016534943175174,"quality":"inauspicious"},{"name":"Udveg","start":"10:01","end":"11:36","startHours":10.016534943175174,"endHours":11.607328618401944,"quality":"inauspicious"},{"name":"Chala","start":"11:36","end":"13:12","startHours":11.607328618401944,"endHours":13.198122293628712,"quality":"neutral"},{"name":"Labha","start":"13:12","end":"14:47","startHours":13.198122293628712,"endHours":14.78891596885548,"quality":"auspicious"},{"name":"Amṛta","start":"14:47","end":"16:23","startHours":14.78891596885548,"endHours":16.37970964408225,"quality":"auspicious"},{"name":"Kāla","start":"16:23","end":"17:58","startHours":16.37970964408225,"endHours":17.97050331930902,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Labha","start":"17:58","end":"19:23","startHours":17.97050331930902,"endHours":19.37970964408225,"quality":"auspicious"},{"name":"Amṛta","start":"19:23","end":"20:47","startHours":19.37970964408225,"endHours":20.788915968855484,"quality":"auspicious"},{"name":"Kāla","start":"20:47","end":"22:12","startHours":20.788915968855484,"endHours":22.198122293628714,"quality":"inauspicious"},{"name":"Śubha","start":"22:12","end":"23:36","startHours":22.198122293628714,"endHours":23.607328618401944,"quality":"auspicious"},{"name":"Roga","start":"23:36","end":"01:01","startHours":23.607328618401944,"endHours":25.016534943175174,"quality":"inauspicious"},{"name":"Udveg","start":"01:01","end":"02:26","startHours":25.016534943175174,"endHours":26.425741267948403,"quality":"inauspicious"},{"name":"Chala","start":"02:26","end":"03:50","startHours":26.425741267948403,"endHours":27.834947592721637,"quality":"neutral"},{"name":"Labha","start":"03:50","end":"05:15","startHours":27.834947592721637,"endHours":29.244153917494867,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"05:15","end":"06:15","startHours":5.244153917494866,"endHours":6.244153917494866,"planetary_lord":"Saturn"},{"name":"Hora 2","start":"06:15","end":"07:15","startHours":6.244153917494866,"endHours":7.244153917494866,"planetary_lord":"Moon"},{"name":"Hora 3","start":"07:15","end":"08:15","startHours":7.244153917494866,"endHours":8.244153917494867,"planetary_lord":"Mercury"},{"name":"Hora 4","start":"08:15","end":"09:15","startHours":8.244153917494867,"endHours":9.244153917494867,"planetary_lord":"Venus"},{"name":"Hora 5","start":"09:15","end":"10:15","startHours":9.244153917494867,"endHours":10.244153917494867,"planetary_lord":"Sun"},{"name":"Hora 6","start":"10:15","end":"11:15","startHours":10.244153917494867,"endHours":11.244153917494867,"planetary_lord":"Mars"},{"name":"Hora 7","start":"11:15","end":"12:15","startHours":11.244153917494867,"endHours":12.244153917494867,"planetary_lord":"Jupiter"},{"name":"Hora 8","start":"12:15","end":"13:15","startHours":12.244153917494867,"endHours":13.244153917494867,"planetary_lord":"Saturn"},{"name":"Hora 9","start":"13:15","end":"14:15","startHours":13.244153917494867,"endHours":14.244153917494867,"planetary_lord":"Moon"},{"name":"Hora 10","start":"14:15","end":"15:15","startHours":14.244153917494867,"endHours":15.244153917494867,"planetary_lord":"Mercury"},{"name":"Hora 11","start":"15:15","end":"16:15","startHours":15.244153917494867,"endHours":16.244153917494867,"planetary_lord":"Venus"},{"name":"Hora 12","start":"16:15","end":"17:15","startHours":16.244153917494867,"endHours":17.244153917494867,"planetary_lord":"Sun"},{"name":"Hora 13","start":"17:15","end":"18:15","startHours":17.244153917494867,"endHours":18.244153917494867,"planetary_lord":"Mars"},{"name":"Hora 14","start":"18:15","end":"19:15","startHours":18.244153917494867,"endHours":19.244153917494867,"planetary_lord":"Jupiter"},{"name":"Hora 15","start":"19:15","end":"20:15","startHours":19.244153917494867,"endHours":20.244153917494867,"planetary_lord":"Saturn"},{"name":"Hora 16","start":"20:15","end":"21:15","startHours":20.244153917494867,"endHours":21.244153917494867,"planetary_lord":"Moon"},{"name":"Hora 17","start":"21:15","end":"22:15","startHours":21.244153917494867,"endHours":22.244153917494867,"planetary_lord":"Mercury"},{"name":"Hora 18","start":"22:15","end":"23:15","startHours":22.244153917494867,"endHours":23.244153917494867,"planetary_lord":"Venus"},{"name":"Hora 19","start":"23:15","end":"00:15","startHours":23.244153917494867,"endHours":24.244153917494867,"planetary_lord":"Sun"},{"name":"Hora 20","start":"00:15","end":"01:15","startHours":24.244153917494867,"endHours":25.244153917494867,"planetary_lord":"Mars"},{"name":"Hora 21","start":"01:15","end":"02:15","startHours":25.244153917494867,"endHours":26.244153917494867,"planetary_lord":"Jupiter"},{"name":"Hora 22","start":"02:15","end":"03:15","startHours":26.244153917494867,"endHours":27.244153917494867,"planetary_lord":"Saturn"},{"name":"Hora 23","start":"03:15","end":"04:15","startHours":27.244153917494867,"endHours":28.244153917494867,"planetary_lord":"Moon"},{"name":"Hora 24","start":"04:15","end":"05:15","startHours":28.244153917494867,"endHours":29.244153917494867,"planetary_lord":"Mercury"}],"taraBala":{"favorable_nakshatras":["Mṛgaśirā","Ārdrā","Punarvasu","Puṣya","Aśleṣā","Citrā","Svātī","Viśākhā","Anurādhā","Jyeṣṭhā","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Rohiṇī","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Mithuna","Karka","Kanyā","Vṛścika","Kumbha","Mīna"],"unfavorable_rashis":["Meṣa","Vṛṣabha","Siṃha","Tulā","Dhanu","Makara"]},"dishaShool":"East (Pūrva)","chandraVasa":"North-West","rahuVasa":"East","anandadiYoga":{"name":"Vajra","quality":"Inauspicious"},"tropicalRitu":"Vasanta (Spring)","vedicRitu":"Vasanta (Spring)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":10.736083426606916,"eotMinutes":0.5058828958834352,"ayanamsa":23.5917}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Caitra","lunar_month_paksha_full":"Caitra Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Caitra","lunar_month_amanta":"Caitra","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":"Caitra Śukla Caturdaśī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[],"todays_walk":{"walk":{"id":"shani-walk","name":"Śani Walk","name_sanskrit":"शनि यात्रा","type":"graha","description":"Tapas + endurance + BG 17.14-19.","step_count":7,"url":"/walk/shani-walk"},"reason":"Śanivāra (Saturday) — its presiding graha's walk."},"cosmic_resonances":[]},"validity":{"eternal":false,"location_specific":"howrah"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga April 18, 1981 CE · Howrah, West Bengal · Vidhyamitra","description":"April 18, 1981 CE for Howrah, West Bengal: Śukla Caturdaśī, sūryodaya 05:15, sūryāsta 17:58.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/howrah/1981-04-18","hreflang_alternates":{"en":"https://vidhyamitra.com/city/howrah/1981-04-18","sa":"https://sa.vidhyamitra.com/city/howrah/1981-04-18","hi":"https://hi.vidhyamitra.com/city/howrah/1981-04-18","x-default":"https://vidhyamitra.com/city/howrah/1981-04-18"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-31T01:44:56.497Z","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":"2026-05-31T01:44:56.497Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-31T01:44:56.497Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}