{"id":"vidhyamitra:city-day:erode:1931-02-01:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/erode/1931-02-01","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1931-02-01","date_display":"February 1, 1931 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":1931,"month":2,"day":1,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2426373.770833,"kali_year":5032,"ahargana":1837908.2708,"sun":{"sidereal_longitude":288.5093,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":81.4246,"rashi":3,"rashi_name":"Mithuna"},"tithi":{"number":13,"name":"Trayodaśī","paksha":"Śukla","full_name":"Śukla Trayodaśī","elongation_degrees":152.9153,"elapsed_within_tithi_degrees":8.9153},"nakshatra":{"number":7,"name":"Punarvasu","pada":1,"moon_longitude":81.4246,"elapsed_within_degrees":1.4246},"yoga":{"number":1,"name":"Viṣkambha","sum_longitude":9.9338},"karana":{"half_tithi_index":25,"name":"Taitila"},"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":1931,"month":2,"day":1,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2426373.770833,"ahargana":1837908.2708,"kali_year":5032,"ayanamsa_lahiri":22.8903,"grahas":{"sun":{"sidereal_longitude":288.330236,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":3},"retrograde":false},"moon":{"sidereal_longitude":80.83403599999997,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":7,"name":"Punarvasu","pada":1},"retrograde":false,"latitude":4.4629},"mars":{"sidereal_longitude":103.29673600000001,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":3},"retrograde":true},"mercury":{"sidereal_longitude":264.556236,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":80.09203600000001,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":7,"name":"Punarvasu","pada":1},"retrograde":true},"venus":{"sidereal_longitude":242.37843599999997,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":1},"retrograde":false},"saturn":{"sidereal_longitude":264.7973360000001,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":4},"retrograde":false},"rahu":{"sidereal_longitude":358.7752,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":178.7752,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","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":1931,"month":2,"day":1,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2426373.770833,"kali_year":5032,"ahargana":1837908.2708,"sun":{"sidereal_longitude":288.5093,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":81.4246,"rashi":3,"rashi_name":"Mithuna"},"tithi":{"number":13,"name":"Trayodaśī","paksha":"Śukla","full_name":"Śukla Trayodaśī","elongation_degrees":152.9153,"elapsed_within_tithi_degrees":8.9153},"nakshatra":{"number":7,"name":"Punarvasu","pada":1,"moon_longitude":81.4246,"elapsed_within_degrees":1.4246},"yoga":{"number":1,"name":"Viṣkambha","sum_longitude":9.9338},"karana":{"half_tithi_index":25,"name":"Taitila"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":4.463,"elongation":152.915},"lunar":{"type":"lunar","occurs":false,"moon_latitude":4.463,"opposition_distance":27.085}},"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":"06:44","sunsetLocal":"18:22","solarNoonLocal":"12:33","dayLengthHours":11.638194386243505,"dayLengthDisplay":"11 Hours 38 Mins 17 Secs","nightLengthDisplay":"12 Hours 21 Mins 43 Secs","moonriseLocal":"16:21","moonsetLocal":"05:05","rahuKala":{"name":"Rāhu Kāla","start":"16:55","end":"18:22","startHours":16.91133203013124,"endHours":18.36610632841168,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"12:33","end":"14:00","startHours":12.547009135289926,"endHours":14.001783433570363,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"15:27","end":"16:55","startHours":15.456557731850802,"endHours":16.91133203013124,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:27","end":"09:50","startHours":9.443490632291658,"endHours":9.831430445166442,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:13","end":"07:31","startHours":7.212836708261653,"endHours":7.52318855856148,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:10","end":"12:56","startHours":12.159069322415142,"endHours":12.93494894816471,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:11","end":"05:57","startHours":5.176152690669039,"endHours":5.952032316418606,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:45","end":"06:44","startHours":5.758062409981215,"endHours":6.7279119421681735,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:29","end":"15:16","startHours":14.486708199663845,"endHours":15.262587825413412,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:10","end":"18:34","startHours":18.16610632841168,"endHours":18.566106328411678,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:22","end":"18:51","startHours":18.36610632841168,"endHours":18.851031094505156,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:07","end":"19:52","startHours":18.11610632841168,"endHours":19.86610632841168,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:10","end":"00:56","startHours":24.159069322415142,"endHours":24.93494894816471,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Udveg","start":"06:44","end":"08:11","startHours":6.7279119421681735,"endHours":8.18268624044861,"quality":"inauspicious"},{"name":"Chala","start":"08:11","end":"09:38","startHours":8.18268624044861,"endHours":9.63746053872905,"quality":"neutral"},{"name":"Labha","start":"09:38","end":"11:06","startHours":9.63746053872905,"endHours":11.092234837009489,"quality":"auspicious"},{"name":"Amṛta","start":"11:06","end":"12:33","startHours":11.092234837009489,"endHours":12.547009135289926,"quality":"auspicious"},{"name":"Kāla","start":"12:33","end":"14:00","startHours":12.547009135289926,"endHours":14.001783433570363,"quality":"inauspicious"},{"name":"Śubha","start":"14:00","end":"15:27","startHours":14.001783433570363,"endHours":15.456557731850802,"quality":"auspicious"},{"name":"Roga","start":"15:27","end":"16:55","startHours":15.456557731850802,"endHours":16.91133203013124,"quality":"inauspicious"},{"name":"Udveg","start":"16:55","end":"18:22","startHours":16.91133203013124,"endHours":18.36610632841168,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Śubha","start":"18:22","end":"19:55","startHours":18.36610632841168,"endHours":19.91133203013124,"quality":"auspicious"},{"name":"Roga","start":"19:55","end":"21:27","startHours":19.91133203013124,"endHours":21.4565577318508,"quality":"inauspicious"},{"name":"Udveg","start":"21:27","end":"23:00","startHours":21.4565577318508,"endHours":23.001783433570363,"quality":"inauspicious"},{"name":"Chala","start":"23:00","end":"00:33","startHours":23.001783433570363,"endHours":24.547009135289926,"quality":"neutral"},{"name":"Labha","start":"00:33","end":"02:06","startHours":24.547009135289926,"endHours":26.09223483700949,"quality":"auspicious"},{"name":"Amṛta","start":"02:06","end":"03:38","startHours":26.09223483700949,"endHours":27.63746053872905,"quality":"auspicious"},{"name":"Kāla","start":"03:38","end":"05:11","startHours":27.63746053872905,"endHours":29.18268624044861,"quality":"inauspicious"},{"name":"Śubha","start":"05:11","end":"06:44","startHours":29.18268624044861,"endHours":30.727911942168173,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"06:44","end":"07:44","startHours":6.7279119421681735,"endHours":7.7279119421681735,"planetary_lord":"Sun"},{"name":"Hora 2","start":"07:44","end":"08:44","startHours":7.7279119421681735,"endHours":8.727911942168173,"planetary_lord":"Mars"},{"name":"Hora 3","start":"08:44","end":"09:44","startHours":8.727911942168173,"endHours":9.727911942168173,"planetary_lord":"Jupiter"},{"name":"Hora 4","start":"09:44","end":"10:44","startHours":9.727911942168173,"endHours":10.727911942168173,"planetary_lord":"Saturn"},{"name":"Hora 5","start":"10:44","end":"11:44","startHours":10.727911942168173,"endHours":11.727911942168173,"planetary_lord":"Moon"},{"name":"Hora 6","start":"11:44","end":"12:44","startHours":11.727911942168173,"endHours":12.727911942168173,"planetary_lord":"Mercury"},{"name":"Hora 7","start":"12:44","end":"13:44","startHours":12.727911942168173,"endHours":13.727911942168173,"planetary_lord":"Venus"},{"name":"Hora 8","start":"13:44","end":"14:44","startHours":13.727911942168173,"endHours":14.727911942168173,"planetary_lord":"Sun"},{"name":"Hora 9","start":"14:44","end":"15:44","startHours":14.727911942168173,"endHours":15.727911942168173,"planetary_lord":"Mars"},{"name":"Hora 10","start":"15:44","end":"16:44","startHours":15.727911942168173,"endHours":16.727911942168173,"planetary_lord":"Jupiter"},{"name":"Hora 11","start":"16:44","end":"17:44","startHours":16.727911942168173,"endHours":17.727911942168173,"planetary_lord":"Saturn"},{"name":"Hora 12","start":"17:44","end":"18:44","startHours":17.727911942168173,"endHours":18.727911942168173,"planetary_lord":"Moon"},{"name":"Hora 13","start":"18:44","end":"19:44","startHours":18.727911942168173,"endHours":19.727911942168173,"planetary_lord":"Mercury"},{"name":"Hora 14","start":"19:44","end":"20:44","startHours":19.727911942168173,"endHours":20.727911942168173,"planetary_lord":"Venus"},{"name":"Hora 15","start":"20:44","end":"21:44","startHours":20.727911942168173,"endHours":21.727911942168173,"planetary_lord":"Sun"},{"name":"Hora 16","start":"21:44","end":"22:44","startHours":21.727911942168173,"endHours":22.727911942168173,"planetary_lord":"Mars"},{"name":"Hora 17","start":"22:44","end":"23:44","startHours":22.727911942168173,"endHours":23.727911942168173,"planetary_lord":"Jupiter"},{"name":"Hora 18","start":"23:44","end":"00:44","startHours":23.727911942168173,"endHours":24.727911942168173,"planetary_lord":"Saturn"},{"name":"Hora 19","start":"00:44","end":"01:44","startHours":24.727911942168173,"endHours":25.727911942168173,"planetary_lord":"Moon"},{"name":"Hora 20","start":"01:44","end":"02:44","startHours":25.727911942168173,"endHours":26.727911942168173,"planetary_lord":"Mercury"},{"name":"Hora 21","start":"02:44","end":"03:44","startHours":26.727911942168173,"endHours":27.727911942168173,"planetary_lord":"Venus"},{"name":"Hora 22","start":"03:44","end":"04:44","startHours":27.727911942168173,"endHours":28.727911942168173,"planetary_lord":"Sun"},{"name":"Hora 23","start":"04:44","end":"05:44","startHours":28.727911942168173,"endHours":29.727911942168173,"planetary_lord":"Mars"},{"name":"Hora 24","start":"05:44","end":"06:44","startHours":29.727911942168173,"endHours":30.727911942168173,"planetary_lord":"Jupiter"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Puṣya","Aśleṣā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Rohiṇī","Mṛgaśirā","Ārdrā","Punarvasu","Hasta","Citrā","Svātī","Viśākhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Meṣa","Mithuna","Siṃha","Vṛścika","Dhanu","Mīna"],"unfavorable_rashis":["Vṛṣabha","Karka","Kanyā","Tulā","Makara","Kumbha"]},"dishaShool":"West (Paścim)","chandraVasa":"South","rahuVasa":"North-East","anandadiYoga":{"name":"Dhvaja","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":-17.407512909011874,"eotMinutes":-13.689348117395623,"ayanamsa":22.8903}},"calendars":{"vikram_samvat":1988,"vikram_samvatsara":"Tāraṇa","saka_samvat":1853,"saka_samvatsara":"Prajāpati","bengali_samvat":1338,"malayalam_era":1107,"nanakshahi_year":462,"lunar_month":"Māgha","lunar_month_paksha_full":"Māgha Śukla Pakṣa","solar_month":"Makara (Tai)","ritu":"Śiśira (Winter)","display_summary":"Māgha Śukla Trayodaśī · Vikram 1988 Tāraṇa · Śaka 1853 Prajāpati"},"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},{"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":"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":[{"historical_date":"-1626101-04-03","event":"Bhagavān Rāma's birth at Ayodhyā","chart_id":"rama","shared_marker":"same Punarvasu","url":"/day/-1626101-04-03","relevance":0.5}]},"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 February 1, 1931 CE · Erode, Tamil Nadu · Vidhyamitra","description":"February 1, 1931 CE for Erode, Tamil Nadu: Śukla Trayodaśī, sūryodaya 06:44, sūryāsta 18:22.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/erode/1931-02-01","hreflang_alternates":{"en":"https://vidhyamitra.com/city/erode/1931-02-01","sa":"https://sa.vidhyamitra.com/city/erode/1931-02-01","hi":"https://hi.vidhyamitra.com/city/erode/1931-02-01","x-default":"https://vidhyamitra.com/city/erode/1931-02-01"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-23T03:09:23.995Z","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":"2026-05-23T03:09:23.995Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-23T03:09:23.995Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}