{"id":"vidhyamitra:city-day:rishikesh:1988-01-31:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/rishikesh/1988-01-31","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1988-01-31","date_display":"January 31, 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":1,"day":31,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2447191.770833,"kali_year":5089,"ahargana":1858726.2708,"sun":{"sidereal_longitude":286.7217,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":74.6549,"rashi":3,"rashi_name":"Mithuna"},"tithi":{"number":13,"name":"Trayodaśī","paksha":"Śukla","full_name":"Śukla Trayodaśī","elongation_degrees":147.9332,"elapsed_within_tithi_degrees":3.9332},"nakshatra":{"number":6,"name":"Ārdrā","pada":3,"moon_longitude":74.6549,"elapsed_within_degrees":7.9882},"yoga":{"number":1,"name":"Viṣkambha","sum_longitude":1.3766},"karana":{"half_tithi_index":24,"name":"Kaulava"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"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":1,"day":31,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2447191.770833,"ahargana":1858726.2708,"kali_year":5089,"ayanamsa_lahiri":23.6865,"grahas":{"sun":{"sidereal_longitude":286.687136,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":3},"retrograde":false},"moon":{"sidereal_longitude":75.78693599999997,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":6,"name":"Ārdrā","pada":3},"retrograde":false,"latitude":4.4455},"mars":{"sidereal_longitude":231.46603600000003,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":18,"name":"Jyeṣṭhā","pada":2},"retrograde":false},"mercury":{"sidereal_longitude":304.140036,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":0.2427359999999794,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":1},"retrograde":false},"venus":{"sidereal_longitude":325.1196359999999,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":244.70643600000005,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":2},"retrograde":false},"rahu":{"sidereal_longitude":335.7374,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":155.7374,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":3},"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":1,"day":31,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2447191.770833,"kali_year":5089,"ahargana":1858726.2708,"sun":{"sidereal_longitude":286.7217,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":74.6549,"rashi":3,"rashi_name":"Mithuna"},"tithi":{"number":13,"name":"Trayodaśī","paksha":"Śukla","full_name":"Śukla Trayodaśī","elongation_degrees":147.9332,"elapsed_within_tithi_degrees":3.9332},"nakshatra":{"number":6,"name":"Ārdrā","pada":3,"moon_longitude":74.6549,"elapsed_within_degrees":7.9882},"yoga":{"number":1,"name":"Viṣkambha","sum_longitude":1.3766},"karana":{"half_tithi_index":24,"name":"Kaulava"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":4.445,"elongation":147.933},"lunar":{"type":"lunar","occurs":false,"moon_latitude":4.445,"opposition_distance":32.067}},"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":"07:09","sunsetLocal":"17:52","solarNoonLocal":"12:30","dayLengthHours":10.72143094928501,"dayLengthDisplay":"10 Hours 43 Mins 17 Secs","nightLengthDisplay":"13 Hours 16 Mins 43 Secs","moonriseLocal":"15:27","moonsetLocal":"05:27","rahuKala":{"name":"Rāhu Kāla","start":"16:32","end":"17:52","startHours":16.528189748345913,"endHours":17.86836861700654,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"12:30","end":"13:51","startHours":12.507653142364035,"endHours":13.84783201102466,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"15:11","end":"16:32","startHours":15.188010879685287,"endHours":16.528189748345913,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:39","end":"10:00","startHours":9.648604889221364,"endHours":10.005985920864198,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:36","end":"07:53","startHours":7.593663957275071,"endHours":7.879568782589338,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:09","end":"12:52","startHours":12.1502721107212,"endHours":12.865034174006869,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:43","end":"06:26","startHours":5.7174135411501945,"endHours":6.432175604435862,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"06:15","end":"07:09","startHours":6.253485088614445,"endHours":7.146937667721529,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:18","end":"15:01","startHours":14.294558300578203,"endHours":15.00932036386387,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:40","end":"18:04","startHours":17.66836861700654,"endHours":18.068368617006538,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:52","end":"18:19","startHours":17.86836861700654,"endHours":18.31509490656008,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:37","end":"19:22","startHours":17.61836861700654,"endHours":19.36836861700654,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:09","end":"00:52","startHours":24.1502721107212,"endHours":24.86503417400687,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Udveg","start":"07:09","end":"08:29","startHours":7.146937667721529,"endHours":8.487116536382155,"quality":"inauspicious"},{"name":"Chala","start":"08:29","end":"09:50","startHours":8.487116536382155,"endHours":9.827295405042781,"quality":"neutral"},{"name":"Labha","start":"09:50","end":"11:10","startHours":9.827295405042781,"endHours":11.167474273703409,"quality":"auspicious"},{"name":"Amṛta","start":"11:10","end":"12:30","startHours":11.167474273703409,"endHours":12.507653142364035,"quality":"auspicious"},{"name":"Kāla","start":"12:30","end":"13:51","startHours":12.507653142364035,"endHours":13.84783201102466,"quality":"inauspicious"},{"name":"Śubha","start":"13:51","end":"15:11","startHours":13.84783201102466,"endHours":15.188010879685287,"quality":"auspicious"},{"name":"Roga","start":"15:11","end":"16:32","startHours":15.188010879685287,"endHours":16.528189748345913,"quality":"inauspicious"},{"name":"Udveg","start":"16:32","end":"17:52","startHours":16.528189748345913,"endHours":17.86836861700654,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Śubha","start":"17:52","end":"19:32","startHours":17.86836861700654,"endHours":19.528189748345913,"quality":"auspicious"},{"name":"Roga","start":"19:32","end":"21:11","startHours":19.528189748345913,"endHours":21.188010879685287,"quality":"inauspicious"},{"name":"Udveg","start":"21:11","end":"22:51","startHours":21.188010879685287,"endHours":22.84783201102466,"quality":"inauspicious"},{"name":"Chala","start":"22:51","end":"00:30","startHours":22.84783201102466,"endHours":24.507653142364035,"quality":"neutral"},{"name":"Labha","start":"00:30","end":"02:10","startHours":24.507653142364035,"endHours":26.167474273703405,"quality":"auspicious"},{"name":"Amṛta","start":"02:10","end":"03:50","startHours":26.167474273703405,"endHours":27.827295405042783,"quality":"auspicious"},{"name":"Kāla","start":"03:50","end":"05:29","startHours":27.827295405042783,"endHours":29.487116536382153,"quality":"inauspicious"},{"name":"Śubha","start":"05:29","end":"07:09","startHours":29.487116536382153,"endHours":31.14693766772153,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"07:09","end":"08:09","startHours":7.146937667721529,"endHours":8.146937667721529,"planetary_lord":"Sun"},{"name":"Hora 2","start":"08:09","end":"09:09","startHours":8.146937667721529,"endHours":9.146937667721529,"planetary_lord":"Mars"},{"name":"Hora 3","start":"09:09","end":"10:09","startHours":9.146937667721529,"endHours":10.146937667721529,"planetary_lord":"Jupiter"},{"name":"Hora 4","start":"10:09","end":"11:09","startHours":10.146937667721529,"endHours":11.146937667721529,"planetary_lord":"Saturn"},{"name":"Hora 5","start":"11:09","end":"12:09","startHours":11.146937667721529,"endHours":12.146937667721529,"planetary_lord":"Moon"},{"name":"Hora 6","start":"12:09","end":"13:09","startHours":12.146937667721529,"endHours":13.146937667721529,"planetary_lord":"Mercury"},{"name":"Hora 7","start":"13:09","end":"14:09","startHours":13.146937667721529,"endHours":14.146937667721529,"planetary_lord":"Venus"},{"name":"Hora 8","start":"14:09","end":"15:09","startHours":14.146937667721529,"endHours":15.146937667721529,"planetary_lord":"Sun"},{"name":"Hora 9","start":"15:09","end":"16:09","startHours":15.146937667721529,"endHours":16.14693766772153,"planetary_lord":"Mars"},{"name":"Hora 10","start":"16:09","end":"17:09","startHours":16.14693766772153,"endHours":17.14693766772153,"planetary_lord":"Jupiter"},{"name":"Hora 11","start":"17:09","end":"18:09","startHours":17.14693766772153,"endHours":18.14693766772153,"planetary_lord":"Saturn"},{"name":"Hora 12","start":"18:09","end":"19:09","startHours":18.14693766772153,"endHours":19.14693766772153,"planetary_lord":"Moon"},{"name":"Hora 13","start":"19:09","end":"20:09","startHours":19.14693766772153,"endHours":20.14693766772153,"planetary_lord":"Mercury"},{"name":"Hora 14","start":"20:09","end":"21:09","startHours":20.14693766772153,"endHours":21.14693766772153,"planetary_lord":"Venus"},{"name":"Hora 15","start":"21:09","end":"22:09","startHours":21.14693766772153,"endHours":22.14693766772153,"planetary_lord":"Sun"},{"name":"Hora 16","start":"22:09","end":"23:09","startHours":22.14693766772153,"endHours":23.14693766772153,"planetary_lord":"Mars"},{"name":"Hora 17","start":"23:09","end":"00:09","startHours":23.14693766772153,"endHours":24.14693766772153,"planetary_lord":"Jupiter"},{"name":"Hora 18","start":"00:09","end":"01:09","startHours":24.14693766772153,"endHours":25.14693766772153,"planetary_lord":"Saturn"},{"name":"Hora 19","start":"01:09","end":"02:09","startHours":25.14693766772153,"endHours":26.14693766772153,"planetary_lord":"Moon"},{"name":"Hora 20","start":"02:09","end":"03:09","startHours":26.14693766772153,"endHours":27.14693766772153,"planetary_lord":"Mercury"},{"name":"Hora 21","start":"03:09","end":"04:09","startHours":27.14693766772153,"endHours":28.14693766772153,"planetary_lord":"Venus"},{"name":"Hora 22","start":"04:09","end":"05:09","startHours":28.14693766772153,"endHours":29.14693766772153,"planetary_lord":"Sun"},{"name":"Hora 23","start":"05:09","end":"06:09","startHours":29.14693766772153,"endHours":30.14693766772153,"planetary_lord":"Mars"},{"name":"Hora 24","start":"06:09","end":"07:09","startHours":30.14693766772153,"endHours":31.14693766772153,"planetary_lord":"Jupiter"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Punarvasu","Puṣya","Aśleṣā","Maghā","Pūrva Phalgunī","Viśākhā","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Kṛttikā","Rohiṇī","Mṛgaśirā","Ārdrā","Uttara Phalgunī","Hasta","Citrā","Svātī","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Meṣa","Mithuna","Siṃha","Vṛścika","Dhanu","Mīna"],"unfavorable_rashis":["Vṛṣabha","Karka","Kanyā","Tulā","Makara","Kumbha"]},"dishaShool":"West (Paścim)","chandraVasa":"South","rahuVasa":"North-East","anandadiYoga":{"name":"Dhvānkṣa","quality":"Inauspicious"},"tropicalRitu":"Śiśira (Winter) (tropical)","vedicRitu":"Hemanta (Pre-winter)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-17.63830559045693,"eotMinutes":-13.52958854184206,"ayanamsa":23.6865}},"calendars":{"vikram_samvat":2045,"vikram_samvatsara":"Vṛṣa","saka_samvat":1910,"saka_samvatsara":"Vibhava","bengali_samvat":1395,"malayalam_era":1164,"nanakshahi_year":519,"lunar_month":"Māgha","lunar_month_paksha_full":"Māgha Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Māgha","lunar_month_amanta":"Māgha","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Makara (Tai)","ritu":"Śiśira (Winter)","display_summary":"Māgha Śukla Trayodaśī · Vikram 2045 Vṛṣa · Śaka 1910 Vibhava"},"festivals":[{"id":"pradosha-vrata","name":"Pradoṣa Vrata","name_sanskrit":"प्रदोष व्रत","tradition":"Shaiva","associated_deity":"Śiva","significance":"Twilight worship of Śiva on Trayodaśī.","vrata":true,"detection":{"any_of":[{"tithi_number":13},{"tithi_number":28}]},"precedence":7}],"todays_walk":{"walk":{"id":"surya-walk","name":"Sūrya Walk","name_sanskrit":"सूर्य यात्रा","type":"graha","description":"Self-illumination + BG 4.1 (Sun-lineage of Gītā transmission).","step_count":6,"url":"/walk/surya-walk"},"reason":"Ravivāra (Sunday) — 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 January 31, 1988 CE · Ṛṣikeśa · Vidhyamitra","description":"January 31, 1988 CE for Ṛṣikeśa: Śukla Trayodaśī, sūryodaya 07:09, sūryāsta 17:52.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/rishikesh/1988-01-31","hreflang_alternates":{"en":"https://vidhyamitra.com/city/rishikesh/1988-01-31","sa":"https://sa.vidhyamitra.com/city/rishikesh/1988-01-31","hi":"https://hi.vidhyamitra.com/city/rishikesh/1988-01-31","x-default":"https://vidhyamitra.com/city/rishikesh/1988-01-31"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-01T18:58:43.256Z","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":"2026-06-01T18:58:43.256Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-01T18:58:43.256Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}