{"id":"vidhyamitra:city-day:jamnagar:1981-09-13:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/jamnagar/1981-09-13","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-09-13","date_display":"September 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":9,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444860.770833,"kali_year":5083,"ahargana":1856395.2708,"sun":{"sidereal_longitude":145.8959,"rashi":5,"rashi_name":"Siṃha"},"moon":{"sidereal_longitude":311.0289,"rashi":11,"rashi_name":"Kumbha"},"tithi":{"number":14,"name":"Caturdaśī","paksha":"Śukla","full_name":"Śukla Caturdaśī","elongation_degrees":165.1331,"elapsed_within_tithi_degrees":9.1331},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":2,"moon_longitude":311.0289,"elapsed_within_degrees":4.3623},"yoga":{"number":8,"name":"Dhṛti","sum_longitude":96.9248},"karana":{"half_tithi_index":27,"name":"Vaṇija"},"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":9,"day":13,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444860.770833,"ahargana":1856395.2708,"kali_year":5083,"ayanamsa_lahiri":23.5974,"grahas":{"sun":{"sidereal_longitude":146.57449699999995,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":4},"retrograde":false},"moon":{"sidereal_longitude":312.351497,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":2},"retrograde":false,"latitude":-2.3685},"mars":{"sidereal_longitude":103.57719700000001,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":171.02979700000003,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":170.833797,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":4},"retrograde":false},"venus":{"sidereal_longitude":186.77119700000003,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":1},"retrograde":false},"saturn":{"sidereal_longitude":166.12749699999995,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":false},"rahu":{"sidereal_longitude":99.245,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":279.245,"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":9,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444860.770833,"kali_year":5083,"ahargana":1856395.2708,"sun":{"sidereal_longitude":145.8959,"rashi":5,"rashi_name":"Siṃha"},"moon":{"sidereal_longitude":311.0289,"rashi":11,"rashi_name":"Kumbha"},"tithi":{"number":14,"name":"Caturdaśī","paksha":"Śukla","full_name":"Śukla Caturdaśī","elongation_degrees":165.1331,"elapsed_within_tithi_degrees":9.1331},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":2,"moon_longitude":311.0289,"elapsed_within_degrees":4.3623},"yoga":{"number":8,"name":"Dhṛti","sum_longitude":96.9248},"karana":{"half_tithi_index":27,"name":"Vaṇija"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-2.368,"elongation":165.133},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-2.368,"opposition_distance":14.867}},"eclipse_window_40days":[]},"city":{"slug":"jamnagar","name":"Jamnagar, Gujarat","lat":22.4707,"lon":70.0577,"tz_offset_hours":5.5,"state":"Gujarat","country":"IN","tier":"tier-1"},"tier2":{"city":{"slug":"jamnagar","name":"Jamnagar, Gujarat","lat":22.4707,"lon":70.0577,"tz_offset_hours":5.5,"state":"Gujarat","country":"IN","tier":"tier-1"},"sunriseLocal":"06:35","sunsetLocal":"18:55","solarNoonLocal":"12:45","dayLengthHours":12.33558781749805,"dayLengthDisplay":"12 Hours 20 Mins 08 Secs","nightLengthDisplay":"11 Hours 39 Mins 52 Secs","moonriseLocal":"18:01","moonsetLocal":"05:35","rahuKala":{"name":"Rāhu Kāla","start":"17:23","end":"18:55","startHours":17.376100916064004,"endHours":18.91804939325126,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"12:45","end":"14:18","startHours":12.750255484502233,"endHours":14.292203961689491,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"15:50","end":"17:23","startHours":15.834152438876746,"endHours":17.376100916064004,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:28","end":"09:52","startHours":9.460765399836088,"endHours":9.871951660419356,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:06","end":"07:26","startHours":7.0964444014822945,"endHours":7.425393409948909,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:20","end":"13:10","startHours":12.339069223918965,"endHours":13.1614417450855,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:56","end":"05:46","startHours":4.937716533420136,"endHours":5.760089054586672,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:33","end":"06:35","startHours":5.554495924295038,"endHours":6.582461575753209,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:48","end":"15:38","startHours":14.806186787418577,"endHours":15.628559308585114,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:43","end":"19:07","startHours":18.71804939325126,"endHours":19.11804939325126,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:55","end":"19:26","startHours":18.91804939325126,"endHours":19.432032218980346,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:40","end":"20:25","startHours":18.66804939325126,"endHours":20.41804939325126,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:20","end":"01:10","startHours":24.339069223918965,"endHours":25.1614417450855,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Udveg","start":"06:35","end":"08:07","startHours":6.582461575753209,"endHours":8.124410052940465,"quality":"inauspicious"},{"name":"Chala","start":"08:07","end":"09:40","startHours":8.124410052940465,"endHours":9.666358530127722,"quality":"neutral"},{"name":"Labha","start":"09:40","end":"11:12","startHours":9.666358530127722,"endHours":11.208307007314978,"quality":"auspicious"},{"name":"Amṛta","start":"11:12","end":"12:45","startHours":11.208307007314978,"endHours":12.750255484502233,"quality":"auspicious"},{"name":"Kāla","start":"12:45","end":"14:18","startHours":12.750255484502233,"endHours":14.292203961689491,"quality":"inauspicious"},{"name":"Śubha","start":"14:18","end":"15:50","startHours":14.292203961689491,"endHours":15.834152438876746,"quality":"auspicious"},{"name":"Roga","start":"15:50","end":"17:23","startHours":15.834152438876746,"endHours":17.376100916064004,"quality":"inauspicious"},{"name":"Udveg","start":"17:23","end":"18:55","startHours":17.376100916064004,"endHours":18.91804939325126,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Śubha","start":"18:55","end":"20:23","startHours":18.91804939325126,"endHours":20.376100916064004,"quality":"auspicious"},{"name":"Roga","start":"20:23","end":"21:50","startHours":20.376100916064004,"endHours":21.834152438876746,"quality":"inauspicious"},{"name":"Udveg","start":"21:50","end":"23:18","startHours":21.834152438876746,"endHours":23.29220396168949,"quality":"inauspicious"},{"name":"Chala","start":"23:18","end":"00:45","startHours":23.29220396168949,"endHours":24.750255484502233,"quality":"neutral"},{"name":"Labha","start":"00:45","end":"02:12","startHours":24.750255484502233,"endHours":26.20830700731498,"quality":"auspicious"},{"name":"Amṛta","start":"02:12","end":"03:40","startHours":26.20830700731498,"endHours":27.666358530127724,"quality":"auspicious"},{"name":"Kāla","start":"03:40","end":"05:07","startHours":27.666358530127724,"endHours":29.124410052940465,"quality":"inauspicious"},{"name":"Śubha","start":"05:07","end":"06:35","startHours":29.124410052940465,"endHours":30.582461575753207,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"06:35","end":"07:35","startHours":6.582461575753209,"endHours":7.582461575753209,"planetary_lord":"Sun"},{"name":"Hora 2","start":"07:35","end":"08:35","startHours":7.582461575753209,"endHours":8.582461575753209,"planetary_lord":"Mars"},{"name":"Hora 3","start":"08:35","end":"09:35","startHours":8.582461575753209,"endHours":9.582461575753209,"planetary_lord":"Jupiter"},{"name":"Hora 4","start":"09:35","end":"10:35","startHours":9.582461575753209,"endHours":10.582461575753209,"planetary_lord":"Saturn"},{"name":"Hora 5","start":"10:35","end":"11:35","startHours":10.582461575753209,"endHours":11.582461575753209,"planetary_lord":"Moon"},{"name":"Hora 6","start":"11:35","end":"12:35","startHours":11.582461575753209,"endHours":12.582461575753209,"planetary_lord":"Mercury"},{"name":"Hora 7","start":"12:35","end":"13:35","startHours":12.582461575753209,"endHours":13.582461575753209,"planetary_lord":"Venus"},{"name":"Hora 8","start":"13:35","end":"14:35","startHours":13.582461575753209,"endHours":14.582461575753209,"planetary_lord":"Sun"},{"name":"Hora 9","start":"14:35","end":"15:35","startHours":14.582461575753209,"endHours":15.582461575753209,"planetary_lord":"Mars"},{"name":"Hora 10","start":"15:35","end":"16:35","startHours":15.582461575753209,"endHours":16.582461575753207,"planetary_lord":"Jupiter"},{"name":"Hora 11","start":"16:35","end":"17:35","startHours":16.582461575753207,"endHours":17.582461575753207,"planetary_lord":"Saturn"},{"name":"Hora 12","start":"17:35","end":"18:35","startHours":17.582461575753207,"endHours":18.582461575753207,"planetary_lord":"Moon"},{"name":"Hora 13","start":"18:35","end":"19:35","startHours":18.582461575753207,"endHours":19.582461575753207,"planetary_lord":"Mercury"},{"name":"Hora 14","start":"19:35","end":"20:35","startHours":19.582461575753207,"endHours":20.582461575753207,"planetary_lord":"Venus"},{"name":"Hora 15","start":"20:35","end":"21:35","startHours":20.582461575753207,"endHours":21.582461575753207,"planetary_lord":"Sun"},{"name":"Hora 16","start":"21:35","end":"22:35","startHours":21.582461575753207,"endHours":22.582461575753207,"planetary_lord":"Mars"},{"name":"Hora 17","start":"22:35","end":"23:35","startHours":22.582461575753207,"endHours":23.582461575753207,"planetary_lord":"Jupiter"},{"name":"Hora 18","start":"23:35","end":"00:35","startHours":23.582461575753207,"endHours":24.582461575753207,"planetary_lord":"Saturn"},{"name":"Hora 19","start":"00:35","end":"01:35","startHours":24.582461575753207,"endHours":25.582461575753207,"planetary_lord":"Moon"},{"name":"Hora 20","start":"01:35","end":"02:35","startHours":25.582461575753207,"endHours":26.582461575753207,"planetary_lord":"Mercury"},{"name":"Hora 21","start":"02:35","end":"03:35","startHours":26.582461575753207,"endHours":27.582461575753207,"planetary_lord":"Venus"},{"name":"Hora 22","start":"03:35","end":"04:35","startHours":27.582461575753207,"endHours":28.582461575753207,"planetary_lord":"Sun"},{"name":"Hora 23","start":"04:35","end":"05:35","startHours":28.582461575753207,"endHours":29.582461575753207,"planetary_lord":"Mars"},{"name":"Hora 24","start":"05:35","end":"06:35","startHours":29.582461575753207,"endHours":30.582461575753207,"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","Karka","Siṃha","Vṛścika","Dhanu","Kumbha"],"unfavorable_rashis":["Vṛṣabha","Mithuna","Kanyā","Tulā","Makara","Mīna"]},"dishaShool":"West (Paścim)","chandraVasa":"South","rahuVasa":"North-East","anandadiYoga":{"name":"Mātaṇga","quality":"Auspicious"},"drikRitu":"Varṣā (Monsoon) (Drik)","vedicRitu":"Varṣā (Monsoon)","drikAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":3.892808873060617,"eotMinutes":4.753870929866006,"ayanamsa":23.5974}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Bhādrapada","lunar_month_paksha_full":"Bhādrapada Śukla Pakṣa","solar_month":"Siṃha (Āvaṇi)","ritu":"Varṣā (Monsoon)","display_summary":"Bhādrapada Śukla Caturdaśī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"simha-sankranti","name":"Siṁha Saṅkrānti","name_sanskrit":"सिंह सङ्क्रान्ति","tradition":"Pan-Hindu","significance":"Sun enters Leo.","vrata":false,"detection":{"sun_rashi":"Siṃha"},"precedence":5}],"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":"jamnagar"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga September 13, 1981 CE · Jamnagar, Gujarat · Vidhyamitra","description":"September 13, 1981 CE for Jamnagar, Gujarat: Śukla Caturdaśī, sūryodaya 06:35, sūryāsta 18:55.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/jamnagar/1981-09-13","hreflang_alternates":{"en":"https://vidhyamitra.com/city/jamnagar/1981-09-13","sa":"https://sa.vidhyamitra.com/city/jamnagar/1981-09-13","hi":"https://hi.vidhyamitra.com/city/jamnagar/1981-09-13","x-default":"https://vidhyamitra.com/city/jamnagar/1981-09-13"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-19T20:39:24.156Z","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":"2026-05-19T20:39:24.156Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-19T20:39:24.156Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}