{"id":"vidhyamitra:city-day:rishikesh:2091-08-18:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/rishikesh/2091-08-18","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"2091-08-18","date_display":"August 18, 2091 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":2091,"month":8,"day":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2485011.770833,"kali_year":5193,"ahargana":1896546.2708,"sun":{"sidereal_longitude":119.4398,"rashi":4,"rashi_name":"Karka"},"moon":{"sidereal_longitude":157.912,"rashi":6,"rashi_name":"Kanyā"},"tithi":{"number":4,"name":"Caturthī","paksha":"Śukla","full_name":"Śukla Caturthī","elongation_degrees":38.4722,"elapsed_within_tithi_degrees":2.4722},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4,"moon_longitude":157.912,"elapsed_within_degrees":11.2453},"yoga":{"number":21,"name":"Siddha","sum_longitude":277.3517},"karana":{"half_tithi_index":6,"name":"Vaṇija"},"vara":{"number":1,"name":"Śanivāra (Saturday)"}},"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":2091,"month":8,"day":18,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2485011.770833,"ahargana":1896546.2708,"kali_year":5193,"ayanamsa_lahiri":25.133,"grahas":{"sun":{"sidereal_longitude":120.284134,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":1},"retrograde":false},"moon":{"sidereal_longitude":160.71473400000002,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":1},"retrograde":false,"latitude":1.9753},"mars":{"sidereal_longitude":181.14513399999998,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":14,"name":"Citrā","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":100.43343400000003,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":3},"retrograde":false},"jupiter":{"sidereal_longitude":257.250234,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":2},"retrograde":true},"venus":{"sidereal_longitude":125.62213400000002,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":70.24613399999998,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":6,"name":"Ārdrā","pada":2},"retrograde":false},"rahu":{"sidereal_longitude":131.8518,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":311.8518,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","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":2091,"month":8,"day":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2485011.770833,"kali_year":5193,"ahargana":1896546.2708,"sun":{"sidereal_longitude":119.4398,"rashi":4,"rashi_name":"Karka"},"moon":{"sidereal_longitude":157.912,"rashi":6,"rashi_name":"Kanyā"},"tithi":{"number":4,"name":"Caturthī","paksha":"Śukla","full_name":"Śukla Caturthī","elongation_degrees":38.4722,"elapsed_within_tithi_degrees":2.4722},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4,"moon_longitude":157.912,"elapsed_within_degrees":11.2453},"yoga":{"number":21,"name":"Siddha","sum_longitude":277.3517},"karana":{"half_tithi_index":6,"name":"Vaṇija"},"vara":{"number":1,"name":"Śanivāra (Saturday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":1.975,"elongation":38.472},"lunar":{"type":"lunar","occurs":false,"moon_latitude":1.975,"opposition_distance":141.528}},"eclipse_window_40days":[{"offset_days":-3,"type":"solar","occurs":true,"moon_latitude":-1.268,"elongation":0.94},{"offset_days":11,"type":"lunar","occurs":true,"moon_latitude":-0.052,"opposition_distance":1.943}]},"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":"05:46","sunsetLocal":"18:55","solarNoonLocal":"12:20","dayLengthHours":13.161910029996115,"dayLengthDisplay":"13 Hours 09 Mins 43 Secs","nightLengthDisplay":"10 Hours 50 Mins 17 Secs","moonriseLocal":"09:05","moonsetLocal":"20:59","rahuKala":{"name":"Rāhu Kāla","start":"09:03","end":"10:42","startHours":9.050483454516147,"endHours":10.69572220826566,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"13:59","end":"15:38","startHours":13.986199715764688,"endHours":15.631438469514205,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"05:46","end":"07:24","startHours":5.760005947017118,"endHours":7.405244700766632,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:50","end":"09:16","startHours":8.831118287349543,"endHours":9.269848621682748,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:19","end":"06:40","startHours":6.308418864933622,"endHours":6.659403132400185,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:54","end":"12:47","startHours":11.90223062768197,"endHours":12.779691296348378,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:00","end":"04:53","startHours":4.005084609684302,"endHours":4.88254527835071,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:40","end":"05:46","startHours":4.663180111184108,"endHours":5.760005947017118,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:32","end":"15:25","startHours":14.534612633681192,"endHours":15.412073302347599,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:43","end":"19:07","startHours":18.721915977013232,"endHours":19.12191597701323,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:55","end":"19:28","startHours":18.92191597701323,"endHours":19.470328894929736,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:40","end":"20:25","startHours":18.67191597701323,"endHours":20.42191597701323,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:54","end":"00:47","startHours":23.90223062768197,"endHours":24.77969129634838,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Kāla","start":"05:46","end":"07:24","startHours":5.760005947017118,"endHours":7.405244700766632,"quality":"inauspicious"},{"name":"Śubha","start":"07:24","end":"09:03","startHours":7.405244700766632,"endHours":9.050483454516147,"quality":"auspicious"},{"name":"Roga","start":"09:03","end":"10:42","startHours":9.050483454516147,"endHours":10.69572220826566,"quality":"inauspicious"},{"name":"Udveg","start":"10:42","end":"12:20","startHours":10.69572220826566,"endHours":12.340960962015174,"quality":"inauspicious"},{"name":"Chala","start":"12:20","end":"13:59","startHours":12.340960962015174,"endHours":13.986199715764688,"quality":"neutral"},{"name":"Labha","start":"13:59","end":"15:38","startHours":13.986199715764688,"endHours":15.631438469514205,"quality":"auspicious"},{"name":"Amṛta","start":"15:38","end":"17:17","startHours":15.631438469514205,"endHours":17.276677223263718,"quality":"auspicious"},{"name":"Kāla","start":"17:17","end":"18:55","startHours":17.276677223263718,"endHours":18.92191597701323,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Labha","start":"18:55","end":"20:17","startHours":18.92191597701323,"endHours":20.276677223263718,"quality":"auspicious"},{"name":"Amṛta","start":"20:17","end":"21:38","startHours":20.276677223263718,"endHours":21.6314384695142,"quality":"auspicious"},{"name":"Kāla","start":"21:38","end":"22:59","startHours":21.6314384695142,"endHours":22.986199715764688,"quality":"inauspicious"},{"name":"Śubha","start":"22:59","end":"00:20","startHours":22.986199715764688,"endHours":24.340960962015174,"quality":"auspicious"},{"name":"Roga","start":"00:20","end":"01:42","startHours":24.340960962015174,"endHours":25.69572220826566,"quality":"inauspicious"},{"name":"Udveg","start":"01:42","end":"03:03","startHours":25.69572220826566,"endHours":27.050483454516147,"quality":"inauspicious"},{"name":"Chala","start":"03:03","end":"04:24","startHours":27.050483454516147,"endHours":28.40524470076663,"quality":"neutral"},{"name":"Labha","start":"04:24","end":"05:46","startHours":28.40524470076663,"endHours":29.760005947017117,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"05:46","end":"06:46","startHours":5.760005947017118,"endHours":6.760005947017118,"planetary_lord":"Saturn"},{"name":"Hora 2","start":"06:46","end":"07:46","startHours":6.760005947017118,"endHours":7.760005947017118,"planetary_lord":"Moon"},{"name":"Hora 3","start":"07:46","end":"08:46","startHours":7.760005947017118,"endHours":8.760005947017117,"planetary_lord":"Mercury"},{"name":"Hora 4","start":"08:46","end":"09:46","startHours":8.760005947017117,"endHours":9.760005947017117,"planetary_lord":"Venus"},{"name":"Hora 5","start":"09:46","end":"10:46","startHours":9.760005947017117,"endHours":10.760005947017117,"planetary_lord":"Sun"},{"name":"Hora 6","start":"10:46","end":"11:46","startHours":10.760005947017117,"endHours":11.760005947017117,"planetary_lord":"Mars"},{"name":"Hora 7","start":"11:46","end":"12:46","startHours":11.760005947017117,"endHours":12.760005947017117,"planetary_lord":"Jupiter"},{"name":"Hora 8","start":"12:46","end":"13:46","startHours":12.760005947017117,"endHours":13.760005947017117,"planetary_lord":"Saturn"},{"name":"Hora 9","start":"13:46","end":"14:46","startHours":13.760005947017117,"endHours":14.760005947017117,"planetary_lord":"Moon"},{"name":"Hora 10","start":"14:46","end":"15:46","startHours":14.760005947017117,"endHours":15.760005947017117,"planetary_lord":"Mercury"},{"name":"Hora 11","start":"15:46","end":"16:46","startHours":15.760005947017117,"endHours":16.760005947017117,"planetary_lord":"Venus"},{"name":"Hora 12","start":"16:46","end":"17:46","startHours":16.760005947017117,"endHours":17.760005947017117,"planetary_lord":"Sun"},{"name":"Hora 13","start":"17:46","end":"18:46","startHours":17.760005947017117,"endHours":18.760005947017117,"planetary_lord":"Mars"},{"name":"Hora 14","start":"18:46","end":"19:46","startHours":18.760005947017117,"endHours":19.760005947017117,"planetary_lord":"Jupiter"},{"name":"Hora 15","start":"19:46","end":"20:46","startHours":19.760005947017117,"endHours":20.760005947017117,"planetary_lord":"Saturn"},{"name":"Hora 16","start":"20:46","end":"21:46","startHours":20.760005947017117,"endHours":21.760005947017117,"planetary_lord":"Moon"},{"name":"Hora 17","start":"21:46","end":"22:46","startHours":21.760005947017117,"endHours":22.760005947017117,"planetary_lord":"Mercury"},{"name":"Hora 18","start":"22:46","end":"23:46","startHours":22.760005947017117,"endHours":23.760005947017117,"planetary_lord":"Venus"},{"name":"Hora 19","start":"23:46","end":"00:46","startHours":23.760005947017117,"endHours":24.760005947017117,"planetary_lord":"Sun"},{"name":"Hora 20","start":"00:46","end":"01:46","startHours":24.760005947017117,"endHours":25.760005947017117,"planetary_lord":"Mars"},{"name":"Hora 21","start":"01:46","end":"02:46","startHours":25.760005947017117,"endHours":26.760005947017117,"planetary_lord":"Jupiter"},{"name":"Hora 22","start":"02:46","end":"03:46","startHours":26.760005947017117,"endHours":27.760005947017117,"planetary_lord":"Saturn"},{"name":"Hora 23","start":"03:46","end":"04:46","startHours":27.760005947017117,"endHours":28.760005947017117,"planetary_lord":"Moon"},{"name":"Hora 24","start":"04:46","end":"05:46","startHours":28.760005947017117,"endHours":29.760005947017117,"planetary_lord":"Mercury"}],"taraBala":{"favorable_nakshatras":["Rohiṇī","Mṛgaśirā","Ārdrā","Punarvasu","Puṣya","Hasta","Citrā","Svātī","Viśākhā","Anurādhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā"],"unfavorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Aśleṣā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Revatī"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Mithuna","Karka","Kanyā","Vṛścika","Kumbha","Mīna"],"unfavorable_rashis":["Meṣa","Vṛṣabha","Siṃha","Tulā","Dhanu","Makara"]},"dishaShool":"East (Pūrva)","chandraVasa":"North-West","rahuVasa":"East","anandadiYoga":{"name":"Śrīvatsa","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":13.047101016308448,"eotMinutes":-3.5280577209103767,"ayanamsa":25.133}},"calendars":{"vikram_samvat":2148,"vikram_samvatsara":"Raktākṣī","saka_samvat":2013,"saka_samvatsara":"Virodhakṛt","bengali_samvat":1498,"malayalam_era":1267,"nanakshahi_year":622,"lunar_month":"Bhādrapada","lunar_month_paksha_full":"Bhādrapada Śukla Pakṣa","solar_month":"Siṃha (Āvaṇi)","ritu":"Varṣā (Monsoon)","display_summary":"Bhādrapada Śukla Caturthī · Vikram 2148 Raktākṣī · Śaka 2013 Virodhakṛt"},"festivals":[{"id":"ganesha-chaturthi","name":"Gaṇeśa Caturthī","name_sanskrit":"गणेश चतुर्थी","tradition":"Pan-Hindu","associated_deity":"Gaṇeśa","significance":"Gaṇeśa's birth day; 11-day festival in Maharashtra.","vrata":false,"detection":{"tithi_number":4,"tithi_paksha":"Śukla","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},{"id":"vinayaka-chaturthi","name":"Vināyaka Caturthī (monthly)","name_sanskrit":"विनायक चतुर्थी","tradition":"Pan-Hindu","associated_deity":"Gaṇeśa","significance":"Monthly Śukla-pakṣa Caturthī; auspicious for new ventures.","vrata":true,"detection":{"tithi_number":4,"tithi_paksha":"Śukla"},"precedence":6}],"todays_walk":{"walk":{"id":"shani-walk","name":"Śani Walk","name_sanskrit":"शनि यात्रा","type":"graha","description":"Tapas + endurance + BG 17.14-19.","step_count":7,"url":"/walk/shani-walk"},"reason":"Śanivāra (Saturday) — its presiding graha's walk."},"cosmic_resonances":[]},"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, 2091 CE · Ṛṣikeśa · Vidhyamitra","description":"August 18, 2091 CE for Ṛṣikeśa: Śukla Caturthī, sūryodaya 05:46, sūryāsta 18:55.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/rishikesh/2091-08-18","hreflang_alternates":{"en":"https://vidhyamitra.com/city/rishikesh/2091-08-18","sa":"https://sa.vidhyamitra.com/city/rishikesh/2091-08-18","hi":"https://hi.vidhyamitra.com/city/rishikesh/2091-08-18","x-default":"https://vidhyamitra.com/city/rishikesh/2091-08-18"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-20T00:06:00.855Z","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":"2026-05-20T00:06:00.855Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-20T00:06:00.855Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}