{"id":"vidhyamitra:city-day:surat:1981-06-13:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/surat/1981-06-13","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-06-13","date_display":"June 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":6,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444768.770833,"kali_year":5083,"ahargana":1856303.2708,"sun":{"sidereal_longitude":58.1954,"rashi":2,"rashi_name":"Vṛṣabha"},"moon":{"sidereal_longitude":185.7979,"rashi":7,"rashi_name":"Tulā"},"tithi":{"number":11,"name":"Ekādaśī","paksha":"Śukla","full_name":"Śukla Ekādaśī","elongation_degrees":127.6025,"elapsed_within_tithi_degrees":7.6025},"nakshatra":{"number":14,"name":"Citrā","pada":4,"moon_longitude":185.7979,"elapsed_within_degrees":12.4646},"yoga":{"number":19,"name":"Parigha","sum_longitude":243.9933},"karana":{"half_tithi_index":21,"name":"Viṣṭi"},"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":6,"day":13,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444768.770833,"ahargana":1856303.2708,"kali_year":5083,"ayanamsa_lahiri":23.5938,"grahas":{"sun":{"sidereal_longitude":58.361312,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":5,"name":"Mr̥gaśirā","pada":2},"retrograde":false},"moon":{"sidereal_longitude":187.95211199999994,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":1},"retrograde":false,"latitude":4.4525},"mars":{"sidereal_longitude":42.20411200000001,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":1},"retrograde":false},"mercury":{"sidereal_longitude":71.50741199999999,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":6,"name":"Ārdrā","pada":2},"retrograde":true},"jupiter":{"sidereal_longitude":157.45621200000005,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":false},"venus":{"sidereal_longitude":76.192812,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":6,"name":"Ārdrā","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":159.199112,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":false},"rahu":{"sidereal_longitude":104.1196,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":284.1196,"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":6,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444768.770833,"kali_year":5083,"ahargana":1856303.2708,"sun":{"sidereal_longitude":58.1954,"rashi":2,"rashi_name":"Vṛṣabha"},"moon":{"sidereal_longitude":185.7979,"rashi":7,"rashi_name":"Tulā"},"tithi":{"number":11,"name":"Ekādaśī","paksha":"Śukla","full_name":"Śukla Ekādaśī","elongation_degrees":127.6025,"elapsed_within_tithi_degrees":7.6025},"nakshatra":{"number":14,"name":"Citrā","pada":4,"moon_longitude":185.7979,"elapsed_within_degrees":12.4646},"yoga":{"number":19,"name":"Parigha","sum_longitude":243.9933},"karana":{"half_tithi_index":21,"name":"Viṣṭi"},"vara":{"number":1,"name":"Śanivāra (Saturday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":4.453,"elongation":127.603},"lunar":{"type":"lunar","occurs":false,"moon_latitude":4.453,"opposition_distance":52.397}},"eclipse_window_40days":[]},"city":{"slug":"surat","name":"Surat, Gujarat","lat":21.1702,"lon":72.8311,"tz_offset_hours":5.5,"state":"Gujarat","country":"IN","tier":"mega","elevation_m":13},"tier2":{"city":{"slug":"surat","name":"Surat, Gujarat","lat":21.1702,"lon":72.8311,"tz_offset_hours":5.5,"state":"Gujarat","country":"IN","tier":"mega","elevation_m":13},"sunriseLocal":"05:56","sunsetLocal":"19:21","solarNoonLocal":"12:38","dayLengthHours":13.40505424907014,"dayLengthDisplay":"13 Hours 24 Mins 18 Secs","nightLengthDisplay":"10 Hours 35 Mins 42 Secs","moonriseLocal":"15:33","moonsetLocal":"03:00","rahuKala":{"name":"Rāhu Kāla","start":"09:17","end":"10:58","startHours":9.289743444422449,"endHours":10.965375225556217,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"14:19","end":"16:00","startHours":14.316638787823752,"endHours":15.992270568957519,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"05:56","end":"07:37","startHours":5.9384798821549145,"endHours":7.614111663288682,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:04","end":"09:31","startHours":9.066325873604614,"endHours":9.513161015240286,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:30","end":"06:51","startHours":6.497023809199503,"endHours":6.854491922508041,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:12","end":"13:05","startHours":12.194171865054313,"endHours":13.087842148325658,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:09","end":"05:03","startHours":4.151139315612229,"endHours":5.044809598883572,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:49","end":"05:56","startHours":4.821392028065736,"endHours":5.9384798821549145,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:53","end":"15:46","startHours":14.875182714868341,"endHours":15.768852998139684,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"19:09","end":"19:33","startHours":19.143534131225056,"endHours":19.543534131225055,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"19:21","end":"19:54","startHours":19.343534131225056,"endHours":19.902078058269645,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"19:06","end":"20:51","startHours":19.093534131225056,"endHours":20.843534131225056,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:12","end":"01:05","startHours":24.194171865054315,"endHours":25.087842148325656,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Kāla","start":"05:56","end":"07:37","startHours":5.9384798821549145,"endHours":7.614111663288682,"quality":"inauspicious"},{"name":"Śubha","start":"07:37","end":"09:17","startHours":7.614111663288682,"endHours":9.289743444422449,"quality":"auspicious"},{"name":"Roga","start":"09:17","end":"10:58","startHours":9.289743444422449,"endHours":10.965375225556217,"quality":"inauspicious"},{"name":"Udveg","start":"10:58","end":"12:38","startHours":10.965375225556217,"endHours":12.641007006689986,"quality":"inauspicious"},{"name":"Chala","start":"12:38","end":"14:19","startHours":12.641007006689986,"endHours":14.316638787823752,"quality":"neutral"},{"name":"Labha","start":"14:19","end":"16:00","startHours":14.316638787823752,"endHours":15.992270568957519,"quality":"auspicious"},{"name":"Amṛta","start":"16:00","end":"17:40","startHours":15.992270568957519,"endHours":17.66790235009129,"quality":"auspicious"},{"name":"Kāla","start":"17:40","end":"19:21","startHours":17.66790235009129,"endHours":19.343534131225056,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Labha","start":"19:21","end":"20:40","startHours":19.343534131225056,"endHours":20.66790235009129,"quality":"auspicious"},{"name":"Amṛta","start":"20:40","end":"22:00","startHours":20.66790235009129,"endHours":21.992270568957522,"quality":"auspicious"},{"name":"Kāla","start":"22:00","end":"23:19","startHours":21.992270568957522,"endHours":23.316638787823752,"quality":"inauspicious"},{"name":"Śubha","start":"23:19","end":"00:38","startHours":23.316638787823752,"endHours":24.641007006689986,"quality":"auspicious"},{"name":"Roga","start":"00:38","end":"01:58","startHours":24.641007006689986,"endHours":25.96537522555622,"quality":"inauspicious"},{"name":"Udveg","start":"01:58","end":"03:17","startHours":25.96537522555622,"endHours":27.28974344442245,"quality":"inauspicious"},{"name":"Chala","start":"03:17","end":"04:37","startHours":27.28974344442245,"endHours":28.614111663288682,"quality":"neutral"},{"name":"Labha","start":"04:37","end":"05:56","startHours":28.614111663288682,"endHours":29.938479882154915,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"05:56","end":"06:56","startHours":5.9384798821549145,"endHours":6.9384798821549145,"planetary_lord":"Saturn"},{"name":"Hora 2","start":"06:56","end":"07:56","startHours":6.9384798821549145,"endHours":7.9384798821549145,"planetary_lord":"Moon"},{"name":"Hora 3","start":"07:56","end":"08:56","startHours":7.9384798821549145,"endHours":8.938479882154915,"planetary_lord":"Mercury"},{"name":"Hora 4","start":"08:56","end":"09:56","startHours":8.938479882154915,"endHours":9.938479882154915,"planetary_lord":"Venus"},{"name":"Hora 5","start":"09:56","end":"10:56","startHours":9.938479882154915,"endHours":10.938479882154915,"planetary_lord":"Sun"},{"name":"Hora 6","start":"10:56","end":"11:56","startHours":10.938479882154915,"endHours":11.938479882154915,"planetary_lord":"Mars"},{"name":"Hora 7","start":"11:56","end":"12:56","startHours":11.938479882154915,"endHours":12.938479882154915,"planetary_lord":"Jupiter"},{"name":"Hora 8","start":"12:56","end":"13:56","startHours":12.938479882154915,"endHours":13.938479882154915,"planetary_lord":"Saturn"},{"name":"Hora 9","start":"13:56","end":"14:56","startHours":13.938479882154915,"endHours":14.938479882154915,"planetary_lord":"Moon"},{"name":"Hora 10","start":"14:56","end":"15:56","startHours":14.938479882154915,"endHours":15.938479882154915,"planetary_lord":"Mercury"},{"name":"Hora 11","start":"15:56","end":"16:56","startHours":15.938479882154915,"endHours":16.938479882154915,"planetary_lord":"Venus"},{"name":"Hora 12","start":"16:56","end":"17:56","startHours":16.938479882154915,"endHours":17.938479882154915,"planetary_lord":"Sun"},{"name":"Hora 13","start":"17:56","end":"18:56","startHours":17.938479882154915,"endHours":18.938479882154915,"planetary_lord":"Mars"},{"name":"Hora 14","start":"18:56","end":"19:56","startHours":18.938479882154915,"endHours":19.938479882154915,"planetary_lord":"Jupiter"},{"name":"Hora 15","start":"19:56","end":"20:56","startHours":19.938479882154915,"endHours":20.938479882154915,"planetary_lord":"Saturn"},{"name":"Hora 16","start":"20:56","end":"21:56","startHours":20.938479882154915,"endHours":21.938479882154915,"planetary_lord":"Moon"},{"name":"Hora 17","start":"21:56","end":"22:56","startHours":21.938479882154915,"endHours":22.938479882154915,"planetary_lord":"Mercury"},{"name":"Hora 18","start":"22:56","end":"23:56","startHours":22.938479882154915,"endHours":23.938479882154915,"planetary_lord":"Venus"},{"name":"Hora 19","start":"23:56","end":"00:56","startHours":23.938479882154915,"endHours":24.938479882154915,"planetary_lord":"Sun"},{"name":"Hora 20","start":"00:56","end":"01:56","startHours":24.938479882154915,"endHours":25.938479882154915,"planetary_lord":"Mars"},{"name":"Hora 21","start":"01:56","end":"02:56","startHours":25.938479882154915,"endHours":26.938479882154915,"planetary_lord":"Jupiter"},{"name":"Hora 22","start":"02:56","end":"03:56","startHours":26.938479882154915,"endHours":27.938479882154915,"planetary_lord":"Saturn"},{"name":"Hora 23","start":"03:56","end":"04:56","startHours":27.938479882154915,"endHours":28.938479882154915,"planetary_lord":"Moon"},{"name":"Hora 24","start":"04:56","end":"05:56","startHours":28.938479882154915,"endHours":29.938479882154915,"planetary_lord":"Mercury"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Ārdrā","Punarvasu","Puṣya","Aśleṣā","Maghā","Svātī","Viśākhā","Anurādhā","Jyeṣṭhā","Mūla","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Bharaṇī","Kṛttikā","Rohiṇī","Mṛgaśirā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Citrā","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Meṣa","Karka","Siṃha","Tulā","Dhanu","Mīna"],"unfavorable_rashis":["Vṛṣabha","Mithuna","Kanyā","Vṛścika","Makara","Kumbha"]},"dishaShool":"East (Pūrva)","chandraVasa":"North","rahuVasa":"East","anandadiYoga":{"name":"Mudgara","quality":"Inauspicious"},"tropicalRitu":"Grīṣma (Summer) (tropical)","vedicRitu":"Vasanta (Spring)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":23.192292878813518,"eotMinutes":0.2151795986009022,"ayanamsa":23.5938}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Jyeṣṭha","lunar_month_paksha_full":"Jyeṣṭha Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Jyeṣṭha","lunar_month_amanta":"Jyeṣṭha","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Vṛṣabha (Vaikāsi)","ritu":"Grīṣma (Summer)","display_summary":"Jyeṣṭha Śukla Ekādaśī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"nirjala-ekadashi","name":"Nirjalā Ekādaśī","name_sanskrit":"निर्जला एकादशी","tradition":"Vaishnava","associated_deity":"Bhagavān Viṣṇu","significance":"Strictest Ekādaśī (no water for 24 hours); Bhīma's vrata. Confers fruit of all 24 Ekādaśīs.","vrata":true,"detection":{"tithi_number":11,"tithi_paksha":"Śukla","lunar_month":"Jyeṣṭha"},"precedence":1,"sources":["Mahābhārata, Anuśāsana Parva"]},{"id":"ekadashi","name":"Ekādaśī","name_sanskrit":"एकादशी","tradition":"Vaishnava","associated_deity":"Bhagavān Viṣṇu","significance":"Sacred to Bhagavān Viṣṇu; vrata for purification.","vrata":true,"detection":{"any_of":[{"tithi_number":11},{"tithi_number":26}]},"precedence":5}],"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":"surat"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga June 13, 1981 CE · Surat, Gujarat · Vidhyamitra","description":"June 13, 1981 CE for Surat, Gujarat: Śukla Ekādaśī, sūryodaya 05:56, sūryāsta 19:21.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/surat/1981-06-13","hreflang_alternates":{"en":"https://vidhyamitra.com/city/surat/1981-06-13","sa":"https://sa.vidhyamitra.com/city/surat/1981-06-13","hi":"https://hi.vidhyamitra.com/city/surat/1981-06-13","x-default":"https://vidhyamitra.com/city/surat/1981-06-13"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-02T09:46:28.583Z","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":"2026-06-02T09:46:28.583Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-02T09:46:28.583Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}