{"id":"vidhyamitra:city-day:erode:1981-04-17:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/erode/1981-04-17","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-04-17","date_display":"April 17, 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":17,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444711.770833,"kali_year":5083,"ahargana":1856246.2708,"sun":{"sidereal_longitude":3.5242,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":157.8658,"rashi":6,"rashi_name":"Kanyā"},"tithi":{"number":13,"name":"Trayodaśī","paksha":"Śukla","full_name":"Śukla Trayodaśī","elongation_degrees":154.3416,"elapsed_within_tithi_degrees":10.3416},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4,"moon_longitude":157.8658,"elapsed_within_degrees":11.1992},"yoga":{"number":13,"name":"Vyāghāta","sum_longitude":161.39},"karana":{"half_tithi_index":25,"name":"Taitila"},"vara":{"number":0,"name":"Śukravāra (Friday)"}},"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":17,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444711.770833,"ahargana":1856246.2708,"kali_year":5083,"ayanamsa_lahiri":23.5917,"grahas":{"sun":{"sidereal_longitude":3.3591900000000123,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":2},"retrograde":false},"moon":{"sidereal_longitude":158.11369000000002,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":false,"latitude":3.4821},"mars":{"sidereal_longitude":0.43049000000002025,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":1},"retrograde":false},"mercury":{"sidereal_longitude":352.14829,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":2},"retrograde":false},"jupiter":{"sidereal_longitude":159.34969,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":true},"venus":{"sidereal_longitude":6.126890000000003,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":161.05818999999997,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":107.1397,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":287.1397,"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":17,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444711.770833,"kali_year":5083,"ahargana":1856246.2708,"sun":{"sidereal_longitude":3.5242,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":157.8658,"rashi":6,"rashi_name":"Kanyā"},"tithi":{"number":13,"name":"Trayodaśī","paksha":"Śukla","full_name":"Śukla Trayodaśī","elongation_degrees":154.3416,"elapsed_within_tithi_degrees":10.3416},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4,"moon_longitude":157.8658,"elapsed_within_degrees":11.1992},"yoga":{"number":13,"name":"Vyāghāta","sum_longitude":161.39},"karana":{"half_tithi_index":25,"name":"Taitila"},"vara":{"number":0,"name":"Śukravāra (Friday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":3.482,"elongation":154.342},"lunar":{"type":"lunar","occurs":false,"moon_latitude":3.482,"opposition_distance":25.658}},"eclipse_window_40days":[]},"city":{"slug":"erode","name":"Erode, Tamil Nadu","lat":11.341,"lon":77.7172,"tz_offset_hours":5.5,"state":"Tamil Nadu","country":"IN","tier":"tier-1"},"tier2":{"city":{"slug":"erode","name":"Erode, Tamil Nadu","lat":11.341,"lon":77.7172,"tz_offset_hours":5.5,"state":"Tamil Nadu","country":"IN","tier":"tier-1"},"sunriseLocal":"06:07","sunsetLocal":"18:31","solarNoonLocal":"12:19","dayLengthHours":12.39613660045123,"dayLengthDisplay":"12 Hours 23 Mins 46 Secs","nightLengthDisplay":"11 Hours 36 Mins 14 Secs","moonriseLocal":"16:36","moonsetLocal":"04:40","rahuKala":{"name":"Rāhu Kāla","start":"10:46","end":"12:19","startHours":10.7649354419481,"endHours":12.314452517004504,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"15:25","end":"16:58","startHours":15.413486667117311,"endHours":16.963003742173715,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"07:40","end":"09:13","startHours":7.665901291835292,"endHours":9.215418366891695,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:01","end":"09:25","startHours":9.008816090217508,"endHours":9.422020643565883,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:38","end":"06:58","startHours":6.632889908464357,"endHours":6.963453551143056,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:54","end":"12:44","startHours":11.901247963656129,"endHours":12.727657070352876,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:28","end":"05:17","startHours":4.463566003385391,"endHours":5.289975110082139,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:05","end":"06:07","startHours":5.083372833407952,"endHours":6.116384216778888,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:23","end":"15:12","startHours":14.380475283746376,"endHours":15.206884390443125,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:19","end":"18:43","startHours":18.31252081723012,"endHours":18.712520817230118,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:31","end":"19:02","startHours":18.51252081723012,"endHours":19.029026508915585,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:16","end":"20:01","startHours":18.26252081723012,"endHours":20.01252081723012,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:54","end":"00:44","startHours":23.90124796365613,"endHours":24.72765707035288,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Chala","start":"06:07","end":"07:40","startHours":6.116384216778888,"endHours":7.665901291835292,"quality":"neutral"},{"name":"Labha","start":"07:40","end":"09:13","startHours":7.665901291835292,"endHours":9.215418366891695,"quality":"auspicious"},{"name":"Amṛta","start":"09:13","end":"10:46","startHours":9.215418366891695,"endHours":10.7649354419481,"quality":"auspicious"},{"name":"Kāla","start":"10:46","end":"12:19","startHours":10.7649354419481,"endHours":12.314452517004504,"quality":"inauspicious"},{"name":"Śubha","start":"12:19","end":"13:52","startHours":12.314452517004504,"endHours":13.863969592060908,"quality":"auspicious"},{"name":"Roga","start":"13:52","end":"15:25","startHours":13.863969592060908,"endHours":15.413486667117311,"quality":"inauspicious"},{"name":"Udveg","start":"15:25","end":"16:58","startHours":15.413486667117311,"endHours":16.963003742173715,"quality":"inauspicious"},{"name":"Chala","start":"16:58","end":"18:31","startHours":16.963003742173715,"endHours":18.51252081723012,"quality":"neutral"}],"nightChoghadiyas":[{"name":"Roga","start":"18:31","end":"19:58","startHours":18.51252081723012,"endHours":19.963003742173715,"quality":"inauspicious"},{"name":"Udveg","start":"19:58","end":"21:25","startHours":19.963003742173715,"endHours":21.41348666711731,"quality":"inauspicious"},{"name":"Chala","start":"21:25","end":"22:52","startHours":21.41348666711731,"endHours":22.863969592060908,"quality":"neutral"},{"name":"Labha","start":"22:52","end":"00:19","startHours":22.863969592060908,"endHours":24.314452517004504,"quality":"auspicious"},{"name":"Amṛta","start":"00:19","end":"01:46","startHours":24.314452517004504,"endHours":25.7649354419481,"quality":"auspicious"},{"name":"Kāla","start":"01:46","end":"03:13","startHours":25.7649354419481,"endHours":27.215418366891697,"quality":"inauspicious"},{"name":"Śubha","start":"03:13","end":"04:40","startHours":27.215418366891697,"endHours":28.66590129183529,"quality":"auspicious"},{"name":"Roga","start":"04:40","end":"06:07","startHours":28.66590129183529,"endHours":30.11638421677889,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"06:07","end":"07:07","startHours":6.116384216778888,"endHours":7.116384216778888,"planetary_lord":"Venus"},{"name":"Hora 2","start":"07:07","end":"08:07","startHours":7.116384216778888,"endHours":8.116384216778888,"planetary_lord":"Sun"},{"name":"Hora 3","start":"08:07","end":"09:07","startHours":8.116384216778888,"endHours":9.116384216778888,"planetary_lord":"Mars"},{"name":"Hora 4","start":"09:07","end":"10:07","startHours":9.116384216778888,"endHours":10.116384216778888,"planetary_lord":"Jupiter"},{"name":"Hora 5","start":"10:07","end":"11:07","startHours":10.116384216778888,"endHours":11.116384216778888,"planetary_lord":"Saturn"},{"name":"Hora 6","start":"11:07","end":"12:07","startHours":11.116384216778888,"endHours":12.116384216778888,"planetary_lord":"Moon"},{"name":"Hora 7","start":"12:07","end":"13:07","startHours":12.116384216778888,"endHours":13.116384216778888,"planetary_lord":"Mercury"},{"name":"Hora 8","start":"13:07","end":"14:07","startHours":13.116384216778888,"endHours":14.116384216778888,"planetary_lord":"Venus"},{"name":"Hora 9","start":"14:07","end":"15:07","startHours":14.116384216778888,"endHours":15.116384216778888,"planetary_lord":"Sun"},{"name":"Hora 10","start":"15:07","end":"16:07","startHours":15.116384216778888,"endHours":16.11638421677889,"planetary_lord":"Mars"},{"name":"Hora 11","start":"16:07","end":"17:07","startHours":16.11638421677889,"endHours":17.11638421677889,"planetary_lord":"Jupiter"},{"name":"Hora 12","start":"17:07","end":"18:07","startHours":17.11638421677889,"endHours":18.11638421677889,"planetary_lord":"Saturn"},{"name":"Hora 13","start":"18:07","end":"19:07","startHours":18.11638421677889,"endHours":19.11638421677889,"planetary_lord":"Moon"},{"name":"Hora 14","start":"19:07","end":"20:07","startHours":19.11638421677889,"endHours":20.11638421677889,"planetary_lord":"Mercury"},{"name":"Hora 15","start":"20:07","end":"21:07","startHours":20.11638421677889,"endHours":21.11638421677889,"planetary_lord":"Venus"},{"name":"Hora 16","start":"21:07","end":"22:07","startHours":21.11638421677889,"endHours":22.11638421677889,"planetary_lord":"Sun"},{"name":"Hora 17","start":"22:07","end":"23:07","startHours":22.11638421677889,"endHours":23.11638421677889,"planetary_lord":"Mars"},{"name":"Hora 18","start":"23:07","end":"00:07","startHours":23.11638421677889,"endHours":24.11638421677889,"planetary_lord":"Jupiter"},{"name":"Hora 19","start":"00:07","end":"01:07","startHours":24.11638421677889,"endHours":25.11638421677889,"planetary_lord":"Saturn"},{"name":"Hora 20","start":"01:07","end":"02:07","startHours":25.11638421677889,"endHours":26.11638421677889,"planetary_lord":"Moon"},{"name":"Hora 21","start":"02:07","end":"03:07","startHours":26.11638421677889,"endHours":27.11638421677889,"planetary_lord":"Mercury"},{"name":"Hora 22","start":"03:07","end":"04:07","startHours":27.11638421677889,"endHours":28.11638421677889,"planetary_lord":"Venus"},{"name":"Hora 23","start":"04:07","end":"05:07","startHours":28.11638421677889,"endHours":29.11638421677889,"planetary_lord":"Sun"},{"name":"Hora 24","start":"05:07","end":"06:07","startHours":29.11638421677889,"endHours":30.11638421677889,"planetary_lord":"Mars"}],"taraBala":{"favorable_nakshatras":["Rohiṇī","Mṛgaśirā","Ārdrā","Punarvasu","Puṣya","Hasta","Citrā","Svātī","Viśākhā","Anurādhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā"],"unfavorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Aśleṣā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Revatī"],"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":"West (Paścim)","chandraVasa":"North-West","rahuVasa":"South-East","anandadiYoga":{"name":"Prajāpati","quality":"Auspicious"},"drikRitu":"Vasanta (Spring)","vedicRitu":"Vasanta (Spring)","drikAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":10.385075713561033,"eotMinutes":0.2640489797298191,"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":"Vaiśākha","lunar_month_paksha_full":"Vaiśākha Śukla Pakṣa","solar_month":"Mēsha (Cittirai / Vaiśākhī)","ritu":"Vasanta (Spring)","display_summary":"Vaiśākha Śukla Trayodaśī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"mesha-sankranti","name":"Meṣa Saṅkrānti (Vaiśākhī / Vishu / Pohelā Boishākh / Bihu)","name_sanskrit":"मेष सङ्क्रान्ति","tradition":"Pan-Hindu","associated_deity":"Sūrya Bhagavān","significance":"Sun enters Aries; solar new year. Regional: Vaiśākhī (Punjab) · Vishu (Kerala) · Pohelā Boishākh (Bengal) · Bihu (Assam) · Tamil Puthāṇḍu.","vrata":false,"detection":{"sun_rashi":"Meṣa"},"precedence":1},{"id":"baisakhi","name":"Baisakhi (Vaiśākhī)","name_sanskrit":"वैशाखी","tradition":"Regional","associated_deity":"Sūrya + Khalsa Pantha (Sikh)","significance":"Punjab New Year + Sikh Khalsa founding day.","vrata":false,"detection":{"sun_rashi":"Meṣa"},"precedence":2},{"id":"pradosha-vrata","name":"Pradoṣa Vrata","name_sanskrit":"प्रदोष व्रत","tradition":"Shaiva","associated_deity":"Śiva","significance":"Twilight worship of Śiva on Trayodaśī.","vrata":true,"detection":{"any_of":[{"tithi_number":13},{"tithi_number":28}]},"precedence":7}],"todays_walk":{"walk":{"id":"shukra-walk","name":"Śukra Walk","name_sanskrit":"शुक्र यात्रा","type":"graha","description":"Beauty + creativity in dharma + BG 10.36.","step_count":5,"url":"/walk/shukra-walk"},"reason":"Śukravāra (Friday) — its presiding graha's walk."},"cosmic_resonances":[]},"validity":{"eternal":false,"location_specific":"erode"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga April 17, 1981 CE · Erode, Tamil Nadu · Vidhyamitra","description":"April 17, 1981 CE for Erode, Tamil Nadu: Śukla Trayodaśī, sūryodaya 06:07, sūryāsta 18:31.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/erode/1981-04-17","hreflang_alternates":{"en":"https://vidhyamitra.com/city/erode/1981-04-17","sa":"https://sa.vidhyamitra.com/city/erode/1981-04-17","hi":"https://hi.vidhyamitra.com/city/erode/1981-04-17","x-default":"https://vidhyamitra.com/city/erode/1981-04-17"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-18T11:54:48.954Z","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":"2026-05-18T11:54:48.954Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-18T11:54:48.954Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}