{"id":"vidhyamitra:city-day:rishikesh:2031-08-18:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/rishikesh/2031-08-18","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"2031-08-18","date_display":"August 18, 2031 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":2031,"month":8,"day":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2463096.770833,"kali_year":5133,"ahargana":1874631.2708,"sun":{"sidereal_longitude":119.9423,"rashi":4,"rashi_name":"Karka"},"moon":{"sidereal_longitude":118.5962,"rashi":4,"rashi_name":"Karka"},"tithi":{"number":30,"name":"Amāvasyā","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Amāvasyā","elongation_degrees":358.6538,"elapsed_within_tithi_degrees":10.6538},"nakshatra":{"number":9,"name":"Āśleṣā","pada":4,"moon_longitude":118.5962,"elapsed_within_degrees":11.9295},"yoga":{"number":18,"name":"Varīyān","sum_longitude":238.5385},"karana":{"half_tithi_index":59,"name":"Nāga"},"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":2031,"month":8,"day":18,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2463096.770833,"ahargana":1874631.2708,"kali_year":5133,"ayanamsa_lahiri":24.2948,"grahas":{"sun":{"sidereal_longitude":120.64324799999997,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":1},"retrograde":false},"moon":{"sidereal_longitude":118.942048,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Aśleṣā","pada":4},"retrograde":false,"latitude":-4.4866},"mars":{"sidereal_longitude":211.14394800000002,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":16,"name":"Viśākhā","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":110.565448,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Aśleṣā","pada":2},"retrograde":false},"jupiter":{"sidereal_longitude":234.826548,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":18,"name":"Jyeṣṭhā","pada":3},"retrograde":true},"venus":{"sidereal_longitude":109.317948,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Aśleṣā","pada":1},"retrograde":false},"saturn":{"sidereal_longitude":56.536248,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":5,"name":"Mr̥gaśirā","pada":1},"retrograde":false},"rahu":{"sidereal_longitude":213.0139,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":16,"name":"Viśākhā","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":33.0139,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":3,"name":"Kṛttikā","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":2031,"month":8,"day":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2463096.770833,"kali_year":5133,"ahargana":1874631.2708,"sun":{"sidereal_longitude":119.9423,"rashi":4,"rashi_name":"Karka"},"moon":{"sidereal_longitude":118.5962,"rashi":4,"rashi_name":"Karka"},"tithi":{"number":30,"name":"Amāvasyā","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Amāvasyā","elongation_degrees":358.6538,"elapsed_within_tithi_degrees":10.6538},"nakshatra":{"number":9,"name":"Āśleṣā","pada":4,"moon_longitude":118.5962,"elapsed_within_degrees":11.9295},"yoga":{"number":18,"name":"Varīyān","sum_longitude":238.5385},"karana":{"half_tithi_index":59,"name":"Nāga"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-4.487,"elongation":1.346},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-4.487,"opposition_distance":178.654}},"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":"05:45","sunsetLocal":"18:56","solarNoonLocal":"12:20","dayLengthHours":13.175234751402023,"dayLengthDisplay":"13 Hours 10 Mins 31 Secs","nightLengthDisplay":"10 Hours 49 Mins 29 Secs","moonriseLocal":"05:38","moonsetLocal":"18:49","rahuKala":{"name":"Rāhu Kāla","start":"07:24","end":"09:03","startHours":7.400247930239416,"endHours":9.04715227416467,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"10:42","end":"12:20","startHours":10.694056618089922,"endHours":12.340960962015174,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"13:59","end":"15:38","startHours":13.987865305940428,"endHours":15.634769649865682,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:50","end":"09:16","startHours":8.82756502830797,"endHours":9.26673952002137,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:18","end":"06:39","startHours":6.302311700955914,"endHours":6.653651294326635,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:54","end":"12:47","startHours":11.901786470301774,"endHours":12.780135453728574,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:00","end":"04:52","startHours":3.99664561946056,"endHours":4.874994602887362,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:39","end":"05:45","startHours":4.655407357030661,"endHours":5.7533435863141635,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:32","end":"15:25","startHours":14.53683342058218,"endHours":15.415182404008982,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:44","end":"19:08","startHours":18.728578337716186,"endHours":19.128578337716185,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:56","end":"19:29","startHours":18.928578337716186,"endHours":19.477546452357938,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:41","end":"20:26","startHours":18.678578337716186,"endHours":20.428578337716186,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:54","end":"00:47","startHours":23.901786470301772,"endHours":24.780135453728576,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Amṛta","start":"05:45","end":"07:24","startHours":5.7533435863141635,"endHours":7.400247930239416,"quality":"auspicious"},{"name":"Kāla","start":"07:24","end":"09:03","startHours":7.400247930239416,"endHours":9.04715227416467,"quality":"inauspicious"},{"name":"Śubha","start":"09:03","end":"10:42","startHours":9.04715227416467,"endHours":10.694056618089922,"quality":"auspicious"},{"name":"Roga","start":"10:42","end":"12:20","startHours":10.694056618089922,"endHours":12.340960962015174,"quality":"inauspicious"},{"name":"Udveg","start":"12:20","end":"13:59","startHours":12.340960962015174,"endHours":13.987865305940428,"quality":"inauspicious"},{"name":"Chala","start":"13:59","end":"15:38","startHours":13.987865305940428,"endHours":15.634769649865682,"quality":"neutral"},{"name":"Labha","start":"15:38","end":"17:17","startHours":15.634769649865682,"endHours":17.281673993790932,"quality":"auspicious"},{"name":"Amṛta","start":"17:17","end":"18:56","startHours":17.281673993790932,"endHours":18.928578337716186,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Chala","start":"18:56","end":"20:17","startHours":18.928578337716186,"endHours":20.281673993790932,"quality":"neutral"},{"name":"Labha","start":"20:17","end":"21:38","startHours":20.281673993790932,"endHours":21.63476964986568,"quality":"auspicious"},{"name":"Amṛta","start":"21:38","end":"22:59","startHours":21.63476964986568,"endHours":22.987865305940428,"quality":"auspicious"},{"name":"Kāla","start":"22:59","end":"00:20","startHours":22.987865305940428,"endHours":24.340960962015174,"quality":"inauspicious"},{"name":"Śubha","start":"00:20","end":"01:42","startHours":24.340960962015174,"endHours":25.69405661808992,"quality":"auspicious"},{"name":"Roga","start":"01:42","end":"03:03","startHours":25.69405661808992,"endHours":27.047152274164667,"quality":"inauspicious"},{"name":"Udveg","start":"03:03","end":"04:24","startHours":27.047152274164667,"endHours":28.400247930239416,"quality":"inauspicious"},{"name":"Chala","start":"04:24","end":"05:45","startHours":28.400247930239416,"endHours":29.753343586314163,"quality":"neutral"}],"horas":[{"name":"Hora 1","start":"05:45","end":"06:45","startHours":5.7533435863141635,"endHours":6.7533435863141635,"planetary_lord":"Moon"},{"name":"Hora 2","start":"06:45","end":"07:45","startHours":6.7533435863141635,"endHours":7.7533435863141635,"planetary_lord":"Mercury"},{"name":"Hora 3","start":"07:45","end":"08:45","startHours":7.7533435863141635,"endHours":8.753343586314163,"planetary_lord":"Venus"},{"name":"Hora 4","start":"08:45","end":"09:45","startHours":8.753343586314163,"endHours":9.753343586314163,"planetary_lord":"Sun"},{"name":"Hora 5","start":"09:45","end":"10:45","startHours":9.753343586314163,"endHours":10.753343586314163,"planetary_lord":"Mars"},{"name":"Hora 6","start":"10:45","end":"11:45","startHours":10.753343586314163,"endHours":11.753343586314163,"planetary_lord":"Jupiter"},{"name":"Hora 7","start":"11:45","end":"12:45","startHours":11.753343586314163,"endHours":12.753343586314163,"planetary_lord":"Saturn"},{"name":"Hora 8","start":"12:45","end":"13:45","startHours":12.753343586314163,"endHours":13.753343586314163,"planetary_lord":"Moon"},{"name":"Hora 9","start":"13:45","end":"14:45","startHours":13.753343586314163,"endHours":14.753343586314163,"planetary_lord":"Mercury"},{"name":"Hora 10","start":"14:45","end":"15:45","startHours":14.753343586314163,"endHours":15.753343586314163,"planetary_lord":"Venus"},{"name":"Hora 11","start":"15:45","end":"16:45","startHours":15.753343586314163,"endHours":16.753343586314163,"planetary_lord":"Sun"},{"name":"Hora 12","start":"16:45","end":"17:45","startHours":16.753343586314163,"endHours":17.753343586314163,"planetary_lord":"Mars"},{"name":"Hora 13","start":"17:45","end":"18:45","startHours":17.753343586314163,"endHours":18.753343586314163,"planetary_lord":"Jupiter"},{"name":"Hora 14","start":"18:45","end":"19:45","startHours":18.753343586314163,"endHours":19.753343586314163,"planetary_lord":"Saturn"},{"name":"Hora 15","start":"19:45","end":"20:45","startHours":19.753343586314163,"endHours":20.753343586314163,"planetary_lord":"Moon"},{"name":"Hora 16","start":"20:45","end":"21:45","startHours":20.753343586314163,"endHours":21.753343586314163,"planetary_lord":"Mercury"},{"name":"Hora 17","start":"21:45","end":"22:45","startHours":21.753343586314163,"endHours":22.753343586314163,"planetary_lord":"Venus"},{"name":"Hora 18","start":"22:45","end":"23:45","startHours":22.753343586314163,"endHours":23.753343586314163,"planetary_lord":"Sun"},{"name":"Hora 19","start":"23:45","end":"00:45","startHours":23.753343586314163,"endHours":24.753343586314163,"planetary_lord":"Mars"},{"name":"Hora 20","start":"00:45","end":"01:45","startHours":24.753343586314163,"endHours":25.753343586314163,"planetary_lord":"Jupiter"},{"name":"Hora 21","start":"01:45","end":"02:45","startHours":25.753343586314163,"endHours":26.753343586314163,"planetary_lord":"Saturn"},{"name":"Hora 22","start":"02:45","end":"03:45","startHours":26.753343586314163,"endHours":27.753343586314163,"planetary_lord":"Moon"},{"name":"Hora 23","start":"03:45","end":"04:45","startHours":27.753343586314163,"endHours":28.753343586314163,"planetary_lord":"Mercury"},{"name":"Hora 24","start":"04:45","end":"05:45","startHours":28.753343586314163,"endHours":29.753343586314163,"planetary_lord":"Venus"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Rohiṇī","Mṛgaśirā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Citrā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā"],"unfavorable_nakshatras":["Ārdrā","Punarvasu","Puṣya","Aśleṣā","Svātī","Viśākhā","Anurādhā","Jyeṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Meṣa","Vṛṣabha","Karka","Kanyā","Dhanu","Makara"],"unfavorable_rashis":["Mithuna","Siṃha","Tulā","Vṛścika","Kumbha","Mīna"]},"dishaShool":"East (Pūrva)","chandraVasa":"South-West","rahuVasa":"North-East","anandadiYoga":{"name":"Mānasa","quality":"Auspicious"},"drikRitu":"Varṣā (Monsoon)","vedicRitu":"Varṣā (Monsoon)","drikAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":13.207723942885863,"eotMinutes":-3.5280577209103767,"ayanamsa":24.2948}},"calendars":{"vikram_samvat":2088,"vikram_samvatsara":"Raktākṣī","saka_samvat":1953,"saka_samvatsara":"Virodhakṛt","bengali_samvat":1438,"malayalam_era":1207,"nanakshahi_year":562,"lunar_month":"Bhādrapada","lunar_month_paksha_full":"Bhādrapada Kṛṣṇa Pakṣa","solar_month":"Siṃha (Āvaṇi)","ritu":"Varṣā (Monsoon)","display_summary":"Bhādrapada Kṛṣṇa Amāvasyā · Vikram 2088 Raktākṣī · Śaka 1953 Virodhakṛt"},"festivals":[{"id":"mahalaya-amavasya","name":"Mahālaya Amāvasyā (Sarvapitṛ Amāvasyā)","name_sanskrit":"महालय अमावस्या","tradition":"Pan-Hindu","associated_deity":"Pitṛ-deva","significance":"Final day of Pitṛ-Pakṣa; tarpaṇa for all ancestors.","vrata":true,"detection":{"tithi_number":30,"tithi_paksha":"Kṛṣṇa","lunar_month":"Bhādrapada"},"precedence":1},{"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":[{"historical_date":"-3137-10-20","event":"Karṇa-Vadha (Mahābhārata Day 17)","chart_id":"karna","shared_marker":"same Kṛṣṇa Amāvasyā","url":"/day/-3137-10-20","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 August 18, 2031 CE · Ṛṣikeśa · Vidhyamitra","description":"August 18, 2031 CE for Ṛṣikeśa: Kṛṣṇa Amāvasyā, sūryodaya 05:45, sūryāsta 18:56.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/rishikesh/2031-08-18","hreflang_alternates":{"en":"https://vidhyamitra.com/city/rishikesh/2031-08-18","sa":"https://sa.vidhyamitra.com/city/rishikesh/2031-08-18","hi":"https://hi.vidhyamitra.com/city/rishikesh/2031-08-18","x-default":"https://vidhyamitra.com/city/rishikesh/2031-08-18"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-15T12:44:23.369Z","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":"2026-05-15T12:44:23.370Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-15T12:44:23.370Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}