{"id":"vidhyamitra:day:2257-09-21:en","page_class":"VM-1-day","url":"https://vidhyamitra.com/day/2257-09-21","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"2257-09-21","date_display":"September 21, 2257 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":2257,"month":9,"day":21,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2545675.770833,"kali_year":5359,"ahargana":1957210.2708,"sun":{"sidereal_longitude":149.3797,"rashi":5,"rashi_name":"Siṃha"},"moon":{"sidereal_longitude":289.4996,"rashi":10,"rashi_name":"Makara"},"tithi":{"number":12,"name":"Dvādaśī","paksha":"Śukla","full_name":"Śukla Dvādaśī","elongation_degrees":140.1199,"elapsed_within_tithi_degrees":8.1199},"nakshatra":{"number":22,"name":"Śravaṇa","pada":3,"moon_longitude":289.4996,"elapsed_within_degrees":9.4996},"yoga":{"number":6,"name":"Atigaṇḍa","sum_longitude":78.8794},"karana":{"half_tithi_index":23,"name":"Bālava"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"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":2257,"month":9,"day":21,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2545675.770833,"ahargana":1957210.2708,"kali_year":5359,"ayanamsa_lahiri":27.4531,"grahas":{"sun":{"sidereal_longitude":150.738523,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":2},"retrograde":false},"moon":{"sidereal_longitude":292.00182300000006,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":4},"retrograde":false,"latitude":3.3469},"mars":{"sidereal_longitude":9.804422999999986,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":3},"retrograde":true},"mercury":{"sidereal_longitude":171.72822300000007,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":251.92792299999996,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":4},"retrograde":false},"venus":{"sidereal_longitude":137.61672299999998,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":284.95792299999994,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":2},"retrograde":true},"rahu":{"sidereal_longitude":157.5811,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":337.5811,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","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":2257,"month":9,"day":21,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2545675.770833,"kali_year":5359,"ahargana":1957210.2708,"sun":{"sidereal_longitude":149.3797,"rashi":5,"rashi_name":"Siṃha"},"moon":{"sidereal_longitude":289.4996,"rashi":10,"rashi_name":"Makara"},"tithi":{"number":12,"name":"Dvādaśī","paksha":"Śukla","full_name":"Śukla Dvādaśī","elongation_degrees":140.1199,"elapsed_within_tithi_degrees":8.1199},"nakshatra":{"number":22,"name":"Śravaṇa","pada":3,"moon_longitude":289.4996,"elapsed_within_degrees":9.4996},"yoga":{"number":6,"name":"Atigaṇḍa","sum_longitude":78.8794},"karana":{"half_tithi_index":23,"name":"Bālava"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":3.347,"elongation":140.12},"lunar":{"type":"lunar","occurs":false,"moon_latitude":3.347,"opposition_distance":39.88}},"eclipse_window_40days":[]},"calendars":{"vikram_samvat":2314,"vikram_samvatsara":"Sādhāraṇa","saka_samvat":2179,"saka_samvatsara":"Hemalambī","bengali_samvat":1664,"malayalam_era":1433,"nanakshahi_year":788,"lunar_month":"Āśvina","lunar_month_paksha_full":"Āśvina Śukla Pakṣa","solar_month":"Kanyā (Puraṭṭāsi)","ritu":"Śarad (Autumn)","display_summary":"Āśvina Śukla Dvādaśī · Vikram 2314 Sādhāraṇa · Śaka 2179 Hemalambī"},"festivals":[{"id":"kanya-sankranti","name":"Kanyā Saṅkrānti (Mahālaya begins)","name_sanskrit":"कन्या सङ्क्रान्ति","tradition":"Pan-Hindu","significance":"Sun enters Virgo; Mahālaya / Pitṛ-Pakṣa solar marker.","vrata":false,"detection":{"sun_rashi":"Kanyā"},"precedence":4}],"todays_walk":{"walk":{"id":"chandra-walk","name":"Candra Walk","name_sanskrit":"चन्द्र यात्रा","type":"graha","description":"Manas-control + BG 6.5-7.","step_count":5,"url":"/walk/chandra-walk"},"reason":"Somavāra (Monday) — its presiding graha's walk."},"cosmic_resonances":[]},"validity":{"eternal":false,"valid_from":"2257-09-21T00:00:00Z"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate; Vidhyamitra substrate"},"seo":{"title":"Pañchāṅga September 21, 2257 CE · Vidhyamitra","description":"Vedic pañchāṅga for September 21, 2257 CE: Śukla Dvādaśī · Śravaṇa.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/day/2257-09-21","hreflang_alternates":{"en":"https://vidhyamitra.com/day/2257-09-21","sa":"https://sa.vidhyamitra.com/day/2257-09-21","hi":"https://hi.vidhyamitra.com/day/2257-09-21","x-default":"https://vidhyamitra.com/day/2257-09-21"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-28T10:02:51.909Z","verification":{"type":"multi-marker","confidence":"canonical"}}],"meta":{"generated_at":"2026-05-28T10:02:51.909Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa"}}}