{"id":"vidhyamitra:city-day:rishikesh:2026-12-17:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/rishikesh/2026-12-17","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"2026-12-17","date_display":"December 17, 2026 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":2026,"month":12,"day":17,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2461391.770833,"kali_year":5128,"ahargana":1872926.2708,"sun":{"sidereal_longitude":240.4284,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":332.1626,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":8,"name":"Aṣṭamī","paksha":"Śukla","full_name":"Śukla Aṣṭamī","elongation_degrees":91.7342,"elapsed_within_tithi_degrees":7.7342},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":4,"moon_longitude":332.1626,"elapsed_within_degrees":12.1626},"yoga":{"number":16,"name":"Siddhi","sum_longitude":212.5911},"karana":{"half_tithi_index":15,"name":"Bava"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"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":2026,"month":12,"day":17,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2461391.770833,"ahargana":1872926.2708,"kali_year":5128,"ayanamsa_lahiri":24.2296,"grahas":{"sun":{"sidereal_longitude":240.86429099999998,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":1},"retrograde":false},"moon":{"sidereal_longitude":328.55789100000004,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":3},"retrograde":false,"latitude":2.1668},"mars":{"sidereal_longitude":132.41649099999995,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":231.732391,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":18,"name":"Jyeṣṭhā","pada":2},"retrograde":false},"jupiter":{"sidereal_longitude":122.54659099999998,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":1},"retrograde":false},"venus":{"sidereal_longitude":194.91049099999998,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":343.790791,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":4},"retrograde":false},"rahu":{"sidereal_longitude":303.353,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":123.353,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","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":2026,"month":12,"day":17,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2461391.770833,"kali_year":5128,"ahargana":1872926.2708,"sun":{"sidereal_longitude":240.4284,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":332.1626,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":8,"name":"Aṣṭamī","paksha":"Śukla","full_name":"Śukla Aṣṭamī","elongation_degrees":91.7342,"elapsed_within_tithi_degrees":7.7342},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":4,"moon_longitude":332.1626,"elapsed_within_degrees":12.1626},"yoga":{"number":16,"name":"Siddhi","sum_longitude":212.5911},"karana":{"half_tithi_index":15,"name":"Bava"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":2.167,"elongation":91.734},"lunar":{"type":"lunar","occurs":false,"moon_latitude":2.167,"opposition_distance":88.266}},"eclipse_window_40days":[]},"city":{"slug":"rishikesh","name":"Ṛṣikeśa","lat":30.0869,"lon":78.2676,"tz_offset_hours":5.5,"state":"Uttarakhand","country":"IN","tier":"tirtha"},"tier2":{"city":{"slug":"rishikesh","name":"Ṛṣikeśa","lat":30.0869,"lon":78.2676,"tz_offset_hours":5.5,"state":"Uttarakhand","country":"IN","tier":"tirtha"},"sunriseLocal":"07:07","sunsetLocal":"17:20","solarNoonLocal":"12:14","dayLengthHours":10.213207443905189,"dayLengthDisplay":"10 Hours 12 Mins 48 Secs","nightLengthDisplay":"13 Hours 47 Mins 12 Secs","moonriseLocal":"12:08","moonsetLocal":"00:01","rahuKala":{"name":"Rāhu Kāla","start":"13:30","end":"14:47","startHours":13.504588115869677,"endHours":14.781239046357825,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"07:07","end":"08:24","startHours":7.121333463428934,"endHours":8.397984393917083,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"09:40","end":"10:57","startHours":9.674635324405232,"endHours":10.951286254893379,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:30","end":"09:51","startHours":9.504415200340144,"endHours":9.844855448470318,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:33","end":"07:49","startHours":7.5468837735916505,"endHours":7.819235972095789,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:53","end":"12:34","startHours":11.887496937251354,"endHours":12.568377433511701,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:46","end":"06:26","startHours":5.7595724709082425,"endHours":6.440452967168588,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"06:16","end":"07:07","startHours":6.270232843103502,"endHours":7.121333463428934,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"13:56","end":"14:37","startHours":13.930138426032393,"endHours":14.61101892229274,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:08","end":"17:32","startHours":17.134540907334124,"endHours":17.534540907334122,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:20","end":"17:46","startHours":17.334540907334123,"endHours":17.76009121749684,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:05","end":"18:50","startHours":17.084540907334123,"endHours":18.834540907334123,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:53","end":"00:34","startHours":23.887496937251356,"endHours":24.5683774335117,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Śubha","start":"07:07","end":"08:24","startHours":7.121333463428934,"endHours":8.397984393917083,"quality":"auspicious"},{"name":"Roga","start":"08:24","end":"09:40","startHours":8.397984393917083,"endHours":9.674635324405232,"quality":"inauspicious"},{"name":"Udveg","start":"09:40","end":"10:57","startHours":9.674635324405232,"endHours":10.951286254893379,"quality":"inauspicious"},{"name":"Chala","start":"10:57","end":"12:14","startHours":10.951286254893379,"endHours":12.227937185381528,"quality":"neutral"},{"name":"Labha","start":"12:14","end":"13:30","startHours":12.227937185381528,"endHours":13.504588115869677,"quality":"auspicious"},{"name":"Amṛta","start":"13:30","end":"14:47","startHours":13.504588115869677,"endHours":14.781239046357825,"quality":"auspicious"},{"name":"Kāla","start":"14:47","end":"16:03","startHours":14.781239046357825,"endHours":16.057889976845974,"quality":"inauspicious"},{"name":"Śubha","start":"16:03","end":"17:20","startHours":16.057889976845974,"endHours":17.334540907334123,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Amṛta","start":"17:20","end":"19:03","startHours":17.334540907334123,"endHours":19.057889976845974,"quality":"auspicious"},{"name":"Kāla","start":"19:03","end":"20:47","startHours":19.057889976845974,"endHours":20.781239046357825,"quality":"inauspicious"},{"name":"Śubha","start":"20:47","end":"22:30","startHours":20.781239046357825,"endHours":22.504588115869677,"quality":"auspicious"},{"name":"Roga","start":"22:30","end":"00:14","startHours":22.504588115869677,"endHours":24.227937185381528,"quality":"inauspicious"},{"name":"Udveg","start":"00:14","end":"01:57","startHours":24.227937185381528,"endHours":25.951286254893382,"quality":"inauspicious"},{"name":"Chala","start":"01:57","end":"03:40","startHours":25.951286254893382,"endHours":27.67463532440523,"quality":"neutral"},{"name":"Labha","start":"03:40","end":"05:24","startHours":27.67463532440523,"endHours":29.397984393917085,"quality":"auspicious"},{"name":"Amṛta","start":"05:24","end":"07:07","startHours":29.397984393917085,"endHours":31.121333463428932,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"07:07","end":"08:07","startHours":7.121333463428934,"endHours":8.121333463428934,"planetary_lord":"Jupiter"},{"name":"Hora 2","start":"08:07","end":"09:07","startHours":8.121333463428934,"endHours":9.121333463428934,"planetary_lord":"Saturn"},{"name":"Hora 3","start":"09:07","end":"10:07","startHours":9.121333463428934,"endHours":10.121333463428934,"planetary_lord":"Moon"},{"name":"Hora 4","start":"10:07","end":"11:07","startHours":10.121333463428934,"endHours":11.121333463428934,"planetary_lord":"Mercury"},{"name":"Hora 5","start":"11:07","end":"12:07","startHours":11.121333463428934,"endHours":12.121333463428934,"planetary_lord":"Venus"},{"name":"Hora 6","start":"12:07","end":"13:07","startHours":12.121333463428934,"endHours":13.121333463428934,"planetary_lord":"Sun"},{"name":"Hora 7","start":"13:07","end":"14:07","startHours":13.121333463428934,"endHours":14.121333463428934,"planetary_lord":"Mars"},{"name":"Hora 8","start":"14:07","end":"15:07","startHours":14.121333463428934,"endHours":15.121333463428934,"planetary_lord":"Jupiter"},{"name":"Hora 9","start":"15:07","end":"16:07","startHours":15.121333463428934,"endHours":16.121333463428932,"planetary_lord":"Saturn"},{"name":"Hora 10","start":"16:07","end":"17:07","startHours":16.121333463428932,"endHours":17.121333463428932,"planetary_lord":"Moon"},{"name":"Hora 11","start":"17:07","end":"18:07","startHours":17.121333463428932,"endHours":18.121333463428932,"planetary_lord":"Mercury"},{"name":"Hora 12","start":"18:07","end":"19:07","startHours":18.121333463428932,"endHours":19.121333463428932,"planetary_lord":"Venus"},{"name":"Hora 13","start":"19:07","end":"20:07","startHours":19.121333463428932,"endHours":20.121333463428932,"planetary_lord":"Sun"},{"name":"Hora 14","start":"20:07","end":"21:07","startHours":20.121333463428932,"endHours":21.121333463428932,"planetary_lord":"Mars"},{"name":"Hora 15","start":"21:07","end":"22:07","startHours":21.121333463428932,"endHours":22.121333463428932,"planetary_lord":"Jupiter"},{"name":"Hora 16","start":"22:07","end":"23:07","startHours":22.121333463428932,"endHours":23.121333463428932,"planetary_lord":"Saturn"},{"name":"Hora 17","start":"23:07","end":"00:07","startHours":23.121333463428932,"endHours":24.121333463428932,"planetary_lord":"Moon"},{"name":"Hora 18","start":"00:07","end":"01:07","startHours":24.121333463428932,"endHours":25.121333463428932,"planetary_lord":"Mercury"},{"name":"Hora 19","start":"01:07","end":"02:07","startHours":25.121333463428932,"endHours":26.121333463428932,"planetary_lord":"Venus"},{"name":"Hora 20","start":"02:07","end":"03:07","startHours":26.121333463428932,"endHours":27.121333463428932,"planetary_lord":"Sun"},{"name":"Hora 21","start":"03:07","end":"04:07","startHours":27.121333463428932,"endHours":28.121333463428932,"planetary_lord":"Mars"},{"name":"Hora 22","start":"04:07","end":"05:07","startHours":28.121333463428932,"endHours":29.121333463428932,"planetary_lord":"Jupiter"},{"name":"Hora 23","start":"05:07","end":"06:07","startHours":29.121333463428932,"endHours":30.121333463428932,"planetary_lord":"Saturn"},{"name":"Hora 24","start":"06:07","end":"07:07","startHours":30.121333463428932,"endHours":31.121333463428932,"planetary_lord":"Moon"}],"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","Karka","Siṃha","Vṛścika","Dhanu","Kumbha"],"unfavorable_rashis":["Vṛṣabha","Mithuna","Kanyā","Tulā","Makara","Mīna"]},"dishaShool":"South (Dakṣiṇa)","chandraVasa":"South","rahuVasa":"North-West","anandadiYoga":{"name":"Mānasa","quality":"Auspicious"},"drikRitu":"Hemanta (Pre-winter)","vedicRitu":"Hemanta (Pre-winter)","drikAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":-23.345531418778254,"eotMinutes":3.253368877108411,"ayanamsa":24.2296}},"calendars":{"vikram_samvat":2083,"vikram_samvatsara":"Siddhārthī","saka_samvat":1948,"saka_samvatsara":"Parābhava","bengali_samvat":1433,"malayalam_era":1202,"nanakshahi_year":557,"lunar_month":"Pauṣa","lunar_month_paksha_full":"Pauṣa Śukla Pakṣa","solar_month":"Dhanus (Mārgaḻi)","ritu":"Hemanta (Pre-winter)","display_summary":"Pauṣa Śukla Aṣṭamī · Vikram 2083 Siddhārthī · Śaka 1948 Parābhava"},"festivals":[{"id":"lohri","name":"Lohri","name_sanskrit":"लोहड़ी","tradition":"Regional","significance":"Punjab harvest festival; eve of Makara Saṅkrānti. (Approximated as 13/14 January annually; correct via Sun in Dhanu/Makara cusp.)","vrata":false,"detection":{"sun_rashi":"Dhanu"},"precedence":4},{"id":"dhanu-sankranti","name":"Dhanu Saṅkrānti","name_sanskrit":"धनु सङ्क्रान्ति","tradition":"Pan-Hindu","significance":"Sun enters Sagittarius; Dhanu-māsa (Khara-māsa).","vrata":false,"detection":{"sun_rashi":"Dhanu"},"precedence":5}],"todays_walk":{"walk":{"id":"guru-walk","name":"Bṛhaspati Walk","name_sanskrit":"गुरु यात्रा","type":"graha","description":"Wisdom transmission + BG 4.34.","step_count":8,"url":"/walk/guru-walk"},"reason":"Guruvāra (Thursday) — 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,"location_specific":"rishikesh"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga December 17, 2026 CE · Ṛṣikeśa · Vidhyamitra","description":"December 17, 2026 CE for Ṛṣikeśa: Śukla Aṣṭamī, sūryodaya 07:07, sūryāsta 17:20.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/rishikesh/2026-12-17","hreflang_alternates":{"en":"https://vidhyamitra.com/city/rishikesh/2026-12-17","sa":"https://sa.vidhyamitra.com/city/rishikesh/2026-12-17","hi":"https://hi.vidhyamitra.com/city/rishikesh/2026-12-17","x-default":"https://vidhyamitra.com/city/rishikesh/2026-12-17"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-14T19:52:11.271Z","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":"2026-05-14T19:52:11.271Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-14T19:52:11.271Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}