{"id":"vidhyamitra:day:1988-09-12:en","page_class":"VM-1-day","url":"https://vidhyamitra.com/day/1988-09-12","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1988-09-12","date_display":"September 12, 1988 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":1988,"month":9,"day":12,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2447416.770833,"kali_year":5090,"ahargana":1858951.2708,"sun":{"sidereal_longitude":145.1082,"rashi":5,"rashi_name":"Siṃha"},"moon":{"sidereal_longitude":155.8321,"rashi":6,"rashi_name":"Kanyā"},"tithi":{"number":1,"name":"Pratipada","paksha":"Śukla","full_name":"Śukla Pratipada","elongation_degrees":10.7239,"elapsed_within_tithi_degrees":10.7239},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":3,"moon_longitude":155.8321,"elapsed_within_degrees":9.1654},"yoga":{"number":23,"name":"Śubha","sum_longitude":300.9403},"karana":{"half_tithi_index":1,"name":"Bava"},"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":1988,"month":9,"day":12,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2447416.770833,"ahargana":1858951.2708,"kali_year":5090,"ayanamsa_lahiri":23.6951,"grahas":{"sun":{"sidereal_longitude":145.801739,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":4},"retrograde":false},"moon":{"sidereal_longitude":154.86623899999995,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":3},"retrograde":false,"latitude":-0.9359},"mars":{"sidereal_longitude":345.983439,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":4},"retrograde":true},"mercury":{"sidereal_longitude":172.26933899999995,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":42.69783899999999,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":1},"retrograde":false},"venus":{"sidereal_longitude":101.299939,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":242.08643900000004,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":1},"retrograde":false},"rahu":{"sidereal_longitude":323.8158,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":143.8158,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":4},"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":1988,"month":9,"day":12,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2447416.770833,"kali_year":5090,"ahargana":1858951.2708,"sun":{"sidereal_longitude":145.1082,"rashi":5,"rashi_name":"Siṃha"},"moon":{"sidereal_longitude":155.8321,"rashi":6,"rashi_name":"Kanyā"},"tithi":{"number":1,"name":"Pratipada","paksha":"Śukla","full_name":"Śukla Pratipada","elongation_degrees":10.7239,"elapsed_within_tithi_degrees":10.7239},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":3,"moon_longitude":155.8321,"elapsed_within_degrees":9.1654},"yoga":{"number":23,"name":"Śubha","sum_longitude":300.9403},"karana":{"half_tithi_index":1,"name":"Bava"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-0.936,"elongation":10.724},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-0.936,"opposition_distance":169.276}},"eclipse_window_40days":[{"offset_days":-1,"type":"solar","occurs":true,"moon_latitude":0.051,"elongation":0.916}]},"calendars":{"vikram_samvat":2045,"vikram_samvatsara":"Vṛṣa","saka_samvat":1910,"saka_samvatsara":"Vibhava","bengali_samvat":1395,"malayalam_era":1164,"nanakshahi_year":519,"lunar_month":"Bhādrapada","lunar_month_paksha_full":"Bhādrapada Śukla Pakṣa","solar_month":"Siṃha (Āvaṇi)","ritu":"Varṣā (Monsoon)","display_summary":"Bhādrapada Śukla Pratipada · Vikram 2045 Vṛṣa · Śaka 1910 Vibhava"},"festivals":[{"id":"simha-sankranti","name":"Siṁha Saṅkrānti","name_sanskrit":"सिंह सङ्क्रान्ति","tradition":"Pan-Hindu","significance":"Sun enters Leo.","vrata":false,"detection":{"sun_rashi":"Siṃha"},"precedence":5}],"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":"1988-09-12T00:00:00Z"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate; Vidhyamitra substrate"},"seo":{"title":"Pañchāṅga September 12, 1988 CE · Vidhyamitra","description":"Vedic pañchāṅga for September 12, 1988 CE: Śukla Pratipada · Uttara Phalgunī.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/day/1988-09-12","hreflang_alternates":{"en":"https://vidhyamitra.com/day/1988-09-12","sa":"https://sa.vidhyamitra.com/day/1988-09-12","hi":"https://hi.vidhyamitra.com/day/1988-09-12","x-default":"https://vidhyamitra.com/day/1988-09-12"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-14T08:36:00.958Z","verification":{"type":"multi-marker","confidence":"canonical"}}],"meta":{"generated_at":"2026-05-14T08:36:00.958Z","pillar_versions":{"BOB-History":"Pūrṇa"}}}