{"id":"vidhyamitra:day:1661-03-21:en","page_class":"VM-1-day","url":"https://vidhyamitra.com/day/1661-03-21","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1661-03-21","date_display":"March 21, 1661 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":1661,"month":3,"day":21,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2327807.770833,"kali_year":4762,"ahargana":1739342.2708,"sun":{"sidereal_longitude":342.7228,"rashi":12,"rashi_name":"Mīna"},"moon":{"sidereal_longitude":222.7563,"rashi":8,"rashi_name":"Vṛścika"},"tithi":{"number":21,"name":"Ṣaṣṭhī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Ṣaṣṭhī","elongation_degrees":240.0336,"elapsed_within_tithi_degrees":0.0336},"nakshatra":{"number":17,"name":"Anurādhā","pada":3,"moon_longitude":222.7563,"elapsed_within_degrees":9.423},"yoga":{"number":16,"name":"Siddhi","sum_longitude":205.4791},"karana":{"half_tithi_index":40,"name":"Gara"},"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":1661,"month":3,"day":21,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2327807.770833,"ahargana":1739342.2708,"kali_year":4762,"ayanamsa_lahiri":19.1205,"grahas":{"sun":{"sidereal_longitude":341.765182,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":3},"retrograde":false},"moon":{"sidereal_longitude":218.52568199999996,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","pada":2},"retrograde":false,"latitude":2.9789},"mars":{"sidereal_longitude":312.827982,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":2},"retrograde":false},"mercury":{"sidereal_longitude":349.534282,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":1},"retrograde":false},"jupiter":{"sidereal_longitude":175.00268200000005,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":1},"retrograde":true},"venus":{"sidereal_longitude":318.90658200000007,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":4},"retrograde":false},"saturn":{"sidereal_longitude":219.21098200000006,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","pada":2},"retrograde":true},"rahu":{"sidereal_longitude":181.2762,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":14,"name":"Citrā","pada":3},"retrograde":false},"ketu":{"sidereal_longitude":1.2762,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":1},"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":1661,"month":3,"day":21,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2327807.770833,"kali_year":4762,"ahargana":1739342.2708,"sun":{"sidereal_longitude":342.7228,"rashi":12,"rashi_name":"Mīna"},"moon":{"sidereal_longitude":222.7563,"rashi":8,"rashi_name":"Vṛścika"},"tithi":{"number":21,"name":"Ṣaṣṭhī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Ṣaṣṭhī","elongation_degrees":240.0336,"elapsed_within_tithi_degrees":0.0336},"nakshatra":{"number":17,"name":"Anurādhā","pada":3,"moon_longitude":222.7563,"elapsed_within_degrees":9.423},"yoga":{"number":16,"name":"Siddhi","sum_longitude":205.4791},"karana":{"half_tithi_index":40,"name":"Gara"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":2.979,"elongation":119.966},"lunar":{"type":"lunar","occurs":false,"moon_latitude":2.979,"opposition_distance":60.034}},"eclipse_window_40days":[]},"calendars":{"vikram_samvat":1718,"vikram_samvatsara":"Ānanda","saka_samvat":1583,"saka_samvatsara":"Plava","bengali_samvat":1068,"malayalam_era":837,"nanakshahi_year":192,"lunar_month":"Caitra","lunar_month_paksha_full":"Caitra Kṛṣṇa Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Caitra","lunar_month_amanta":"Phālguna","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Mīna (Paṅkuṇi)","ritu":"Vasanta (Spring)","display_summary":"Caitra Kṛṣṇa Ṣaṣṭhī · Vikram 1718 Ānanda · Śaka 1583 Plava"},"festivals":[],"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":"1661-03-21T00:00:00Z"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate; Vidhyamitra substrate"},"seo":{"title":"Pañchāṅga March 21, 1661 CE · Vidhyamitra","description":"Vedic pañchāṅga for March 21, 1661 CE: Kṛṣṇa Ṣaṣṭhī · Anurādhā.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/day/1661-03-21","hreflang_alternates":{"en":"https://vidhyamitra.com/day/1661-03-21","sa":"https://sa.vidhyamitra.com/day/1661-03-21","hi":"https://hi.vidhyamitra.com/day/1661-03-21","x-default":"https://vidhyamitra.com/day/1661-03-21"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-05T01:58:34.237Z","verification":{"type":"multi-marker","confidence":"canonical"}}],"meta":{"generated_at":"2026-06-05T01:58:34.237Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa"}}}