{"id":"vidhyamitra:day:1921-05-15:en","page_class":"VM-1-day","url":"https://vidhyamitra.com/day/1921-05-15","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1921-05-15","date_display":"May 15, 1921 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":1921,"month":5,"day":15,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2422824.770833,"kali_year":5023,"ahargana":1834359.2708,"sun":{"sidereal_longitude":31.0696,"rashi":2,"rashi_name":"Vṛṣabha"},"moon":{"sidereal_longitude":125.2835,"rashi":5,"rashi_name":"Siṃha"},"tithi":{"number":8,"name":"Aṣṭamī","paksha":"Śukla","full_name":"Śukla Aṣṭamī","elongation_degrees":94.2139,"elapsed_within_tithi_degrees":10.2139},"nakshatra":{"number":10,"name":"Maghā","pada":2,"moon_longitude":125.2835,"elapsed_within_degrees":5.2835},"yoga":{"number":12,"name":"Dhruva","sum_longitude":156.3531},"karana":{"half_tithi_index":15,"name":"Bava"},"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":1921,"month":5,"day":15,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2422824.770833,"ahargana":1834359.2708,"kali_year":5023,"ayanamsa_lahiri":22.7546,"grahas":{"sun":{"sidereal_longitude":30.90643399999999,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":3,"name":"Kṛttikā","pada":2},"retrograde":false},"moon":{"sidereal_longitude":126.197834,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":2},"retrograde":false,"latitude":-3.9551},"mars":{"sidereal_longitude":44.59393399999999,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":2},"retrograde":false},"mercury":{"sidereal_longitude":37.45073400000001,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":3,"name":"Kṛttikā","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":136.955134,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":2},"retrograde":false},"venus":{"sidereal_longitude":2.2253339999999753,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":1},"retrograde":false},"saturn":{"sidereal_longitude":145.61173399999996,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":4},"retrograde":true},"rahu":{"sidereal_longitude":186.8183,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":6.8183,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","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":1921,"month":5,"day":15,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2422824.770833,"kali_year":5023,"ahargana":1834359.2708,"sun":{"sidereal_longitude":31.0696,"rashi":2,"rashi_name":"Vṛṣabha"},"moon":{"sidereal_longitude":125.2835,"rashi":5,"rashi_name":"Siṃha"},"tithi":{"number":8,"name":"Aṣṭamī","paksha":"Śukla","full_name":"Śukla Aṣṭamī","elongation_degrees":94.2139,"elapsed_within_tithi_degrees":10.2139},"nakshatra":{"number":10,"name":"Maghā","pada":2,"moon_longitude":125.2835,"elapsed_within_degrees":5.2835},"yoga":{"number":12,"name":"Dhruva","sum_longitude":156.3531},"karana":{"half_tithi_index":15,"name":"Bava"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-3.955,"elongation":94.214},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-3.955,"opposition_distance":85.786}},"eclipse_window_40days":[{"offset_days":-7,"type":"solar","occurs":true,"moon_latitude":-1.406,"elongation":1.055}]},"calendars":{"vikram_samvat":1978,"vikram_samvatsara":"Bhāva","saka_samvat":1843,"saka_samvatsara":"Durmati","bengali_samvat":1328,"malayalam_era":1097,"nanakshahi_year":452,"lunar_month":"Jyeṣṭha","lunar_month_paksha_full":"Jyeṣṭha Śukla Pakṣa","solar_month":"Vṛṣabha (Vaikāsi)","ritu":"Grīṣma (Summer)","display_summary":"Jyeṣṭha Śukla Aṣṭamī · Vikram 1978 Bhāva · Śaka 1843 Durmati"},"festivals":[{"id":"vrishabha-sankranti","name":"Vṛṣabha Saṅkrānti","name_sanskrit":"वृषभ सङ्क्रान्ति","tradition":"Pan-Hindu","significance":"Sun enters Taurus.","vrata":false,"detection":{"sun_rashi":"Vṛṣabha"},"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":[{"historical_date":"-3137-12-25","event":"Bhīṣma's Mahaprasthan","chart_id":"bhishma","shared_marker":"same Śukla Aṣṭamī","url":"/day/-3137-12-25","relevance":0.5}]},"validity":{"eternal":false,"valid_from":"1921-05-15T00:00:00Z"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate; Vidhyamitra substrate"},"seo":{"title":"Pañchāṅga May 15, 1921 CE · Vidhyamitra","description":"Vedic pañchāṅga for May 15, 1921 CE: Śukla Aṣṭamī · Maghā.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/day/1921-05-15","hreflang_alternates":{"en":"https://vidhyamitra.com/day/1921-05-15","sa":"https://sa.vidhyamitra.com/day/1921-05-15","hi":"https://hi.vidhyamitra.com/day/1921-05-15","x-default":"https://vidhyamitra.com/day/1921-05-15"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-14T06:12:07.658Z","verification":{"type":"multi-marker","confidence":"canonical"}}],"meta":{"generated_at":"2026-05-14T06:12:07.658Z","pillar_versions":{"BOB-History":"Pūrṇa"}}}