{"id":"vidhyamitra:city-day:chennai:2027-07-18:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/chennai/2027-07-18","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"2027-07-18","date_display":"July 18, 2027 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":2027,"month":7,"day":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2461604.770833,"kali_year":5129,"ahargana":1873139.2708,"sun":{"sidereal_longitude":90.4851,"rashi":4,"rashi_name":"Karka"},"moon":{"sidereal_longitude":264.4512,"rashi":9,"rashi_name":"Dhanu"},"tithi":{"number":15,"name":"Pūrṇimā","paksha":"Śukla","full_name":"Śukla Pūrṇimā","elongation_degrees":173.9661,"elapsed_within_tithi_degrees":5.9661},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":4,"moon_longitude":264.4512,"elapsed_within_degrees":11.1179},"yoga":{"number":27,"name":"Vaidhṛti","sum_longitude":354.9363},"karana":{"half_tithi_index":28,"name":"Viṣṭi"},"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":2027,"month":7,"day":18,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2461604.770833,"ahargana":1873139.2708,"kali_year":5129,"ayanamsa_lahiri":24.2377,"grahas":{"sun":{"sidereal_longitude":90.99605300000002,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":7,"name":"Punarvasu","pada":4},"retrograde":false},"moon":{"sidereal_longitude":264.28375299999993,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":4},"retrograde":false,"latitude":-2.0843},"mars":{"sidereal_longitude":157.028053,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":70.06145300000003,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":6,"name":"Ārdrā","pada":2},"retrograde":false},"jupiter":{"sidereal_longitude":123.902853,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":2},"retrograde":false},"venus":{"sidereal_longitude":83.74575299999998,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":7,"name":"Punarvasu","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":3.2233529999999746,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":1},"retrograde":false},"rahu":{"sidereal_longitude":292.0673,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":112.0673,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","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":2027,"month":7,"day":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2461604.770833,"kali_year":5129,"ahargana":1873139.2708,"sun":{"sidereal_longitude":90.4851,"rashi":4,"rashi_name":"Karka"},"moon":{"sidereal_longitude":264.4512,"rashi":9,"rashi_name":"Dhanu"},"tithi":{"number":15,"name":"Pūrṇimā","paksha":"Śukla","full_name":"Śukla Pūrṇimā","elongation_degrees":173.9661,"elapsed_within_tithi_degrees":5.9661},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":4,"moon_longitude":264.4512,"elapsed_within_degrees":11.1179},"yoga":{"number":27,"name":"Vaidhṛti","sum_longitude":354.9363},"karana":{"half_tithi_index":28,"name":"Viṣṭi"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-2.084,"elongation":173.966},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-2.084,"opposition_distance":6.034}},"eclipse_window_40days":[]},"city":{"slug":"chennai","name":"Chennai, Tamil Nadu","lat":13.0827,"lon":80.2707,"tz_offset_hours":5.5,"state":"Tamil Nadu","country":"IN","tier":"mega","elevation_m":6},"tier2":{"city":{"slug":"chennai","name":"Chennai, Tamil Nadu","lat":13.0827,"lon":80.2707,"tz_offset_hours":5.5,"state":"Tamil Nadu","country":"IN","tier":"mega","elevation_m":6},"sunriseLocal":"05:51","sunsetLocal":"18:39","solarNoonLocal":"12:15","dayLengthHours":12.808276592738743,"dayLengthDisplay":"12 Hours 48 Mins 30 Secs","nightLengthDisplay":"11 Hours 11 Mins 30 Secs","moonriseLocal":"18:07","moonsetLocal":"05:29","rahuKala":{"name":"Rāhu Kāla","start":"17:03","end":"18:39","startHours":17.049322324285512,"endHours":18.650356898377854,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"12:15","end":"13:51","startHours":12.246218602008483,"endHours":13.847253176100825,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"15:27","end":"17:03","startHours":15.448287750193169,"endHours":17.049322324285512,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:50","end":"09:15","startHours":8.830678177278152,"endHours":9.257620730369442,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:23","end":"06:43","startHours":6.3757584970032255,"endHours":6.717312539476259,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:49","end":"12:40","startHours":11.81927604891719,"endHours":12.673161155099775,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:08","end":"04:59","startHours":4.134310093273946,"endHours":4.988195199456529,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:46","end":"05:51","startHours":4.774723922910883,"endHours":5.8420803056391115,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:23","end":"15:14","startHours":14.38093136746494,"endHours":15.234816473647523,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:27","end":"18:51","startHours":18.450356898377855,"endHours":18.850356898377854,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:39","end":"19:11","startHours":18.650356898377854,"endHours":19.18403508974197,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:24","end":"20:09","startHours":18.400356898377854,"endHours":20.150356898377854,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:49","end":"00:40","startHours":23.819276048917192,"endHours":24.673161155099773,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Udveg","start":"05:51","end":"07:27","startHours":5.8420803056391115,"endHours":7.443114879731454,"quality":"inauspicious"},{"name":"Chala","start":"07:27","end":"09:03","startHours":7.443114879731454,"endHours":9.044149453823797,"quality":"neutral"},{"name":"Labha","start":"09:03","end":"10:39","startHours":9.044149453823797,"endHours":10.645184027916141,"quality":"auspicious"},{"name":"Amṛta","start":"10:39","end":"12:15","startHours":10.645184027916141,"endHours":12.246218602008483,"quality":"auspicious"},{"name":"Kāla","start":"12:15","end":"13:51","startHours":12.246218602008483,"endHours":13.847253176100825,"quality":"inauspicious"},{"name":"Śubha","start":"13:51","end":"15:27","startHours":13.847253176100825,"endHours":15.448287750193169,"quality":"auspicious"},{"name":"Roga","start":"15:27","end":"17:03","startHours":15.448287750193169,"endHours":17.049322324285512,"quality":"inauspicious"},{"name":"Udveg","start":"17:03","end":"18:39","startHours":17.049322324285512,"endHours":18.650356898377854,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Śubha","start":"18:39","end":"20:03","startHours":18.650356898377854,"endHours":20.049322324285512,"quality":"auspicious"},{"name":"Roga","start":"20:03","end":"21:27","startHours":20.049322324285512,"endHours":21.448287750193167,"quality":"inauspicious"},{"name":"Udveg","start":"21:27","end":"22:51","startHours":21.448287750193167,"endHours":22.847253176100825,"quality":"inauspicious"},{"name":"Chala","start":"22:51","end":"00:15","startHours":22.847253176100825,"endHours":24.246218602008483,"quality":"neutral"},{"name":"Labha","start":"00:15","end":"01:39","startHours":24.246218602008483,"endHours":25.64518402791614,"quality":"auspicious"},{"name":"Amṛta","start":"01:39","end":"03:03","startHours":25.64518402791614,"endHours":27.0441494538238,"quality":"auspicious"},{"name":"Kāla","start":"03:03","end":"04:27","startHours":27.0441494538238,"endHours":28.443114879731453,"quality":"inauspicious"},{"name":"Śubha","start":"04:27","end":"05:51","startHours":28.443114879731453,"endHours":29.84208030563911,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"05:51","end":"06:51","startHours":5.8420803056391115,"endHours":6.8420803056391115,"planetary_lord":"Sun"},{"name":"Hora 2","start":"06:51","end":"07:51","startHours":6.8420803056391115,"endHours":7.8420803056391115,"planetary_lord":"Mars"},{"name":"Hora 3","start":"07:51","end":"08:51","startHours":7.8420803056391115,"endHours":8.842080305639112,"planetary_lord":"Jupiter"},{"name":"Hora 4","start":"08:51","end":"09:51","startHours":8.842080305639112,"endHours":9.842080305639112,"planetary_lord":"Saturn"},{"name":"Hora 5","start":"09:51","end":"10:51","startHours":9.842080305639112,"endHours":10.842080305639112,"planetary_lord":"Moon"},{"name":"Hora 6","start":"10:51","end":"11:51","startHours":10.842080305639112,"endHours":11.842080305639112,"planetary_lord":"Mercury"},{"name":"Hora 7","start":"11:51","end":"12:51","startHours":11.842080305639112,"endHours":12.842080305639112,"planetary_lord":"Venus"},{"name":"Hora 8","start":"12:51","end":"13:51","startHours":12.842080305639112,"endHours":13.842080305639112,"planetary_lord":"Sun"},{"name":"Hora 9","start":"13:51","end":"14:51","startHours":13.842080305639112,"endHours":14.842080305639112,"planetary_lord":"Mars"},{"name":"Hora 10","start":"14:51","end":"15:51","startHours":14.842080305639112,"endHours":15.842080305639112,"planetary_lord":"Jupiter"},{"name":"Hora 11","start":"15:51","end":"16:51","startHours":15.842080305639112,"endHours":16.84208030563911,"planetary_lord":"Saturn"},{"name":"Hora 12","start":"16:51","end":"17:51","startHours":16.84208030563911,"endHours":17.84208030563911,"planetary_lord":"Moon"},{"name":"Hora 13","start":"17:51","end":"18:51","startHours":17.84208030563911,"endHours":18.84208030563911,"planetary_lord":"Mercury"},{"name":"Hora 14","start":"18:51","end":"19:51","startHours":18.84208030563911,"endHours":19.84208030563911,"planetary_lord":"Venus"},{"name":"Hora 15","start":"19:51","end":"20:51","startHours":19.84208030563911,"endHours":20.84208030563911,"planetary_lord":"Sun"},{"name":"Hora 16","start":"20:51","end":"21:51","startHours":20.84208030563911,"endHours":21.84208030563911,"planetary_lord":"Mars"},{"name":"Hora 17","start":"21:51","end":"22:51","startHours":21.84208030563911,"endHours":22.84208030563911,"planetary_lord":"Jupiter"},{"name":"Hora 18","start":"22:51","end":"23:51","startHours":22.84208030563911,"endHours":23.84208030563911,"planetary_lord":"Saturn"},{"name":"Hora 19","start":"23:51","end":"00:51","startHours":23.84208030563911,"endHours":24.84208030563911,"planetary_lord":"Moon"},{"name":"Hora 20","start":"00:51","end":"01:51","startHours":24.84208030563911,"endHours":25.84208030563911,"planetary_lord":"Mercury"},{"name":"Hora 21","start":"01:51","end":"02:51","startHours":25.84208030563911,"endHours":26.84208030563911,"planetary_lord":"Venus"},{"name":"Hora 22","start":"02:51","end":"03:51","startHours":26.84208030563911,"endHours":27.84208030563911,"planetary_lord":"Sun"},{"name":"Hora 23","start":"03:51","end":"04:51","startHours":27.84208030563911,"endHours":28.84208030563911,"planetary_lord":"Mars"},{"name":"Hora 24","start":"04:51","end":"05:51","startHours":28.84208030563911,"endHours":29.84208030563911,"planetary_lord":"Jupiter"}],"taraBala":{"favorable_nakshatras":["Kṛttikā","Rohiṇī","Mṛgaśirā","Ārdrā","Punarvasu","Uttara Phalgunī","Hasta","Citrā","Svātī","Viśākhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā"],"unfavorable_nakshatras":["Aśvinī","Bharaṇī","Puṣya","Aśleṣā","Maghā","Pūrva Phalgunī","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Bhādrapadā","Revatī"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Vṛṣabha","Mithuna","Kanyā","Tulā","Dhanu","Kumbha"],"unfavorable_rashis":["Meṣa","Karka","Siṃha","Vṛścika","Makara","Mīna"]},"dishaShool":"West (Paścim)","chandraVasa":"East","rahuVasa":"North-East","anandadiYoga":{"name":"Śubha","quality":"Auspicious"},"tropicalRitu":"Grīṣma (Summer)","vedicRitu":"Grīṣma (Summer)","tropicalAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":21.08664061741532,"eotMinutes":-5.85591612050904,"ayanamsa":24.2377}},"calendars":{"vikram_samvat":2084,"vikram_samvatsara":"Raudra","saka_samvat":1949,"saka_samvatsara":"Plavaṅga","bengali_samvat":1434,"malayalam_era":1203,"nanakshahi_year":558,"lunar_month":"Āṣāḍha","lunar_month_paksha_full":"Āṣāḍha Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Āṣāḍha","lunar_month_amanta":"Āṣāḍha","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Karkaṭa (Āḍi)","ritu":"Grīṣma (Summer)","display_summary":"Āṣāḍha Śukla Pūrṇimā · Vikram 2084 Raudra · Śaka 1949 Plavaṅga"},"festivals":[{"id":"guru-purnima","name":"Guru Pūrṇimā / Vyāsa Pūrṇimā","name_sanskrit":"गुरु पूर्णिमा / व्यास पूर्णिमा","tradition":"Pan-Hindu","associated_deity":"Vyāsa-jī","significance":"Honor Vyāsa-jī and all gurus.","vrata":false,"detection":{"tithi_number":15,"tithi_paksha":"Śukla","lunar_month":"Āṣāḍha"},"precedence":1},{"id":"vyasa-purnima","name":"Vyāsa Pūrṇimā (= Guru Pūrṇimā)","name_sanskrit":"व्यास पूर्णिमा","tradition":"Pan-Hindu","associated_deity":"Veda-Vyāsa","significance":"Birth of Veda-Vyāsa; Mahābhārata-Purāṇa-vibhāga-kartā. = Guru Pūrṇimā.","vrata":true,"detection":{"tithi_number":15,"tithi_paksha":"Śukla","lunar_month":"Āṣāḍha"},"precedence":1,"related_chart":"vyasa"}],"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":"Dedicated festival walk for Guru Pūrṇimā / Vyāsa Pūrṇimā · Vyāsa Pūrṇimā (= Guru Pūrṇimā) is not live yet; Ravivāra (Sunday) — its presiding graha's walk."},"cosmic_resonances":[]},"validity":{"eternal":false,"location_specific":"chennai"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga July 18, 2027 CE · Chennai, Tamil Nadu · Vidhyamitra","description":"July 18, 2027 CE for Chennai, Tamil Nadu: Śukla Pūrṇimā, sūryodaya 05:51, sūryāsta 18:39.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/chennai/2027-07-18","hreflang_alternates":{"en":"https://vidhyamitra.com/city/chennai/2027-07-18","sa":"https://sa.vidhyamitra.com/city/chennai/2027-07-18","hi":"https://hi.vidhyamitra.com/city/chennai/2027-07-18","x-default":"https://vidhyamitra.com/city/chennai/2027-07-18"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-07-27T16:05:04.122Z","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":"2026-07-27T16:05:04.122Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-07-27T16:05:04.122Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"},"reader_local_antaryami":{"reader_geography":"Every reader enters from their own kṣetra anywhere on Bhūmi; no founder-city is the universal center.","purna_chain":["Goloka/Vraja Rādhā-Krishna","Vaikuṇṭha Lakṣmī-Nārāyaṇa","Mahāviṣṇu/Kāraṇodakaśāyī Viṣṇu","Garbhodakaśāyī Viṣṇu","Brahmā","Kṣīrodaka Paramātmā/Antaryāmī (Kṣīrodakaśāyī Viṣṇu)","Bhūmi","reader's own kṣetra anywhere on Bhūmi","exact reading kṣetra","Divyāṁśa-bhakta","chitta/vāṇī/aṅgulī","keyboard-silicon-pathways","Vidhyāmitra substrate","reader/seer","Krishna"],"antaryami_responsibility_formula":"Kṣīrodakaśāyī Viṣṇu = Paramātmā = Antaryāmī. Jīva desires. Prakṛti executes through guṇas. Paramātmā witnesses, permits, remembers, guides, and sustains. Bhagavān is the ultimate source.","source_anchors":[{"label":"BG 13.23","path":"/bhagavad-gita/13/23","meaning":"upadraṣṭā-anumantā · witness-permitter"},{"label":"BG 15.15","path":"/bhagavad-gita/15/15","meaning":"the Lord seated in every heart as memory, knowledge, and forgetting"},{"label":"BG 18.61","path":"/bhagavad-gita/18/61","meaning":"Īśvara seated in the heart of all beings"}],"nama_seal":"Hare Krishna Hare Krishna · Krishna Krishna Hare Hare · Hare Rama Hare Rama · Rama Rama Hare Hare"}}}