{"id":"vidhyamitra:city-day:rishikesh:2025-12-28:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/rishikesh/2025-12-28","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"2025-12-28","date_display":"December 28, 2025 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":2025,"month":12,"day":28,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2461037.770833,"kali_year":5127,"ahargana":1872572.2708,"sun":{"sidereal_longitude":251.9942,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":348.3161,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":9,"name":"Navamī","paksha":"Śukla","full_name":"Śukla Navamī","elongation_degrees":96.3218,"elapsed_within_tithi_degrees":0.3218},"nakshatra":{"number":27,"name":"Revatī","pada":1,"moon_longitude":348.3161,"elapsed_within_degrees":1.6494},"yoga":{"number":19,"name":"Parigha","sum_longitude":240.3103},"karana":{"half_tithi_index":16,"name":"Bālava"},"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":2025,"month":12,"day":28,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2461037.770833,"ahargana":1872572.2708,"kali_year":5127,"ayanamsa_lahiri":24.2161,"grahas":{"sun":{"sidereal_longitude":252.32761700000003,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":4},"retrograde":false},"moon":{"sidereal_longitude":345.386217,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":4},"retrograde":false,"latitude":1.9856},"mars":{"sidereal_longitude":255.06681700000001,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":1},"retrograde":false},"mercury":{"sidereal_longitude":238.03141700000003,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":18,"name":"Jyeṣṭhā","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":87.50811699999997,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":7,"name":"Punarvasu","pada":3},"retrograde":true},"venus":{"sidereal_longitude":249.67911700000002,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":331.81851700000004,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":4},"retrograde":false},"rahu":{"sidereal_longitude":322.1096,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":142.1096,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva 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":2025,"month":12,"day":28,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2461037.770833,"kali_year":5127,"ahargana":1872572.2708,"sun":{"sidereal_longitude":251.9942,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":348.3161,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":9,"name":"Navamī","paksha":"Śukla","full_name":"Śukla Navamī","elongation_degrees":96.3218,"elapsed_within_tithi_degrees":0.3218},"nakshatra":{"number":27,"name":"Revatī","pada":1,"moon_longitude":348.3161,"elapsed_within_degrees":1.6494},"yoga":{"number":19,"name":"Parigha","sum_longitude":240.3103},"karana":{"half_tithi_index":16,"name":"Bālava"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":1.986,"elongation":96.322},"lunar":{"type":"lunar","occurs":false,"moon_latitude":1.986,"opposition_distance":83.678}},"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":"07:12","sunsetLocal":"17:25","solarNoonLocal":"12:19","dayLengthHours":10.21979125781791,"dayLengthDisplay":"10 Hours 13 Mins 11 Secs","nightLengthDisplay":"13 Hours 46 Mins 49 Secs","moonriseLocal":"12:20","moonsetLocal":"00:43","rahuKala":{"name":"Rāhu Kāla","start":"16:09","end":"17:25","startHours":16.146033462753174,"endHours":17.423507369980413,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"12:19","end":"13:35","startHours":12.313611741071458,"endHours":13.591085648298698,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"14:52","end":"16:09","startHours":14.868559555525938,"endHours":16.146033462753174,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:35","end":"09:56","startHours":9.588334072320016,"endHours":9.928993780913947,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:38","end":"07:54","startHours":7.629540747904917,"endHours":7.902068514780061,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:58","end":"12:39","startHours":11.972952032477528,"endHours":12.654271449665389,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:50","end":"06:31","startHours":5.841077277786782,"endHours":6.522396694974644,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"06:21","end":"07:12","startHours":6.352066840677678,"endHours":7.203716112162504,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:01","end":"14:42","startHours":14.01691028404111,"endHours":14.698229701228971,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:13","end":"17:37","startHours":17.223507369980414,"endHours":17.623507369980413,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:25","end":"17:51","startHours":17.423507369980413,"endHours":17.849332005722825,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:10","end":"18:55","startHours":17.173507369980413,"endHours":18.923507369980413,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:58","end":"00:39","startHours":23.97295203247753,"endHours":24.654271449665387,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Udveg","start":"07:12","end":"08:29","startHours":7.203716112162504,"endHours":8.481190019389743,"quality":"inauspicious"},{"name":"Chala","start":"08:29","end":"09:46","startHours":8.481190019389743,"endHours":9.758663926616983,"quality":"neutral"},{"name":"Labha","start":"09:46","end":"11:02","startHours":9.758663926616983,"endHours":11.03613783384422,"quality":"auspicious"},{"name":"Amṛta","start":"11:02","end":"12:19","startHours":11.03613783384422,"endHours":12.313611741071458,"quality":"auspicious"},{"name":"Kāla","start":"12:19","end":"13:35","startHours":12.313611741071458,"endHours":13.591085648298698,"quality":"inauspicious"},{"name":"Śubha","start":"13:35","end":"14:52","startHours":13.591085648298698,"endHours":14.868559555525938,"quality":"auspicious"},{"name":"Roga","start":"14:52","end":"16:09","startHours":14.868559555525938,"endHours":16.146033462753174,"quality":"inauspicious"},{"name":"Udveg","start":"16:09","end":"17:25","startHours":16.146033462753174,"endHours":17.423507369980413,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Śubha","start":"17:25","end":"19:09","startHours":17.423507369980413,"endHours":19.146033462753174,"quality":"auspicious"},{"name":"Roga","start":"19:09","end":"20:52","startHours":19.146033462753174,"endHours":20.868559555525934,"quality":"inauspicious"},{"name":"Udveg","start":"20:52","end":"22:35","startHours":20.868559555525934,"endHours":22.591085648298698,"quality":"inauspicious"},{"name":"Chala","start":"22:35","end":"00:19","startHours":22.591085648298698,"endHours":24.31361174107146,"quality":"neutral"},{"name":"Labha","start":"00:19","end":"02:02","startHours":24.31361174107146,"endHours":26.03613783384422,"quality":"auspicious"},{"name":"Amṛta","start":"02:02","end":"03:46","startHours":26.03613783384422,"endHours":27.758663926616983,"quality":"auspicious"},{"name":"Kāla","start":"03:46","end":"05:29","startHours":27.758663926616983,"endHours":29.481190019389743,"quality":"inauspicious"},{"name":"Śubha","start":"05:29","end":"07:12","startHours":29.481190019389743,"endHours":31.203716112162503,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"07:12","end":"08:12","startHours":7.203716112162504,"endHours":8.203716112162503,"planetary_lord":"Sun"},{"name":"Hora 2","start":"08:12","end":"09:12","startHours":8.203716112162503,"endHours":9.203716112162503,"planetary_lord":"Mars"},{"name":"Hora 3","start":"09:12","end":"10:12","startHours":9.203716112162503,"endHours":10.203716112162503,"planetary_lord":"Jupiter"},{"name":"Hora 4","start":"10:12","end":"11:12","startHours":10.203716112162503,"endHours":11.203716112162503,"planetary_lord":"Saturn"},{"name":"Hora 5","start":"11:12","end":"12:12","startHours":11.203716112162503,"endHours":12.203716112162503,"planetary_lord":"Moon"},{"name":"Hora 6","start":"12:12","end":"13:12","startHours":12.203716112162503,"endHours":13.203716112162503,"planetary_lord":"Mercury"},{"name":"Hora 7","start":"13:12","end":"14:12","startHours":13.203716112162503,"endHours":14.203716112162503,"planetary_lord":"Venus"},{"name":"Hora 8","start":"14:12","end":"15:12","startHours":14.203716112162503,"endHours":15.203716112162503,"planetary_lord":"Sun"},{"name":"Hora 9","start":"15:12","end":"16:12","startHours":15.203716112162503,"endHours":16.203716112162503,"planetary_lord":"Mars"},{"name":"Hora 10","start":"16:12","end":"17:12","startHours":16.203716112162503,"endHours":17.203716112162503,"planetary_lord":"Jupiter"},{"name":"Hora 11","start":"17:12","end":"18:12","startHours":17.203716112162503,"endHours":18.203716112162503,"planetary_lord":"Saturn"},{"name":"Hora 12","start":"18:12","end":"19:12","startHours":18.203716112162503,"endHours":19.203716112162503,"planetary_lord":"Moon"},{"name":"Hora 13","start":"19:12","end":"20:12","startHours":19.203716112162503,"endHours":20.203716112162503,"planetary_lord":"Mercury"},{"name":"Hora 14","start":"20:12","end":"21:12","startHours":20.203716112162503,"endHours":21.203716112162503,"planetary_lord":"Venus"},{"name":"Hora 15","start":"21:12","end":"22:12","startHours":21.203716112162503,"endHours":22.203716112162503,"planetary_lord":"Sun"},{"name":"Hora 16","start":"22:12","end":"23:12","startHours":22.203716112162503,"endHours":23.203716112162503,"planetary_lord":"Mars"},{"name":"Hora 17","start":"23:12","end":"00:12","startHours":23.203716112162503,"endHours":24.203716112162503,"planetary_lord":"Jupiter"},{"name":"Hora 18","start":"00:12","end":"01:12","startHours":24.203716112162503,"endHours":25.203716112162503,"planetary_lord":"Saturn"},{"name":"Hora 19","start":"01:12","end":"02:12","startHours":25.203716112162503,"endHours":26.203716112162503,"planetary_lord":"Moon"},{"name":"Hora 20","start":"02:12","end":"03:12","startHours":26.203716112162503,"endHours":27.203716112162503,"planetary_lord":"Mercury"},{"name":"Hora 21","start":"03:12","end":"04:12","startHours":27.203716112162503,"endHours":28.203716112162503,"planetary_lord":"Venus"},{"name":"Hora 22","start":"04:12","end":"05:12","startHours":28.203716112162503,"endHours":29.203716112162503,"planetary_lord":"Sun"},{"name":"Hora 23","start":"05:12","end":"06:12","startHours":29.203716112162503,"endHours":30.203716112162503,"planetary_lord":"Mars"},{"name":"Hora 24","start":"06:12","end":"07:12","startHours":30.203716112162503,"endHours":31.203716112162503,"planetary_lord":"Jupiter"}],"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":["Vṛṣabha","Siṃha","Kanyā","Dhanu","Makara","Mīna"],"unfavorable_rashis":["Meṣa","Mithuna","Karka","Tulā","Vṛścika","Kumbha"]},"dishaShool":"West (Paścim)","chandraVasa":"South-West","rahuVasa":"North-East","anandadiYoga":{"name":"Sushira","quality":"Auspicious"},"drikRitu":"Hemanta (Pre-winter) (Drik)","vedicRitu":"Hemanta (Pre-winter)","drikAyana":"Uttarāyaṇa","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":-23.274787523123223,"eotMinutes":-1.8871044642874448,"ayanamsa":24.2161}},"calendars":{"vikram_samvat":2082,"vikram_samvatsara":"Kālayukta","saka_samvat":1947,"saka_samvatsara":"Viśvāvasu","bengali_samvat":1432,"malayalam_era":1201,"nanakshahi_year":556,"lunar_month":"Pauṣa","lunar_month_paksha_full":"Pauṣa Śukla Pakṣa","solar_month":"Dhanus (Mārgaḻi)","ritu":"Hemanta (Pre-winter)","display_summary":"Pauṣa Śukla Navamī · Vikram 2082 Kālayukta · Śaka 1947 Viśvāvasu"},"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":"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":[{"historical_date":"-1626101-04-03","event":"Bhagavān Rāma's birth at Ayodhyā","chart_id":"rama","shared_marker":"same Śukla Navamī","url":"/day/-1626101-04-03","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 28, 2025 CE · Ṛṣikeśa · Vidhyamitra","description":"December 28, 2025 CE for Ṛṣikeśa: Śukla Navamī, sūryodaya 07:12, sūryāsta 17:25.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/rishikesh/2025-12-28","hreflang_alternates":{"en":"https://vidhyamitra.com/city/rishikesh/2025-12-28","sa":"https://sa.vidhyamitra.com/city/rishikesh/2025-12-28","hi":"https://hi.vidhyamitra.com/city/rishikesh/2025-12-28","x-default":"https://vidhyamitra.com/city/rishikesh/2025-12-28"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-14T22:01:28.719Z","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":"2026-05-14T22:01:28.719Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-14T22:01:28.719Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}