{"id":"vidhyamitra:city-day:chicago:2027-05-18:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/chicago/2027-05-18","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"2027-05-18","date_display":"May 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":5,"day":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2461543.770833,"kali_year":5129,"ahargana":1873078.2708,"sun":{"sidereal_longitude":32.5749,"rashi":2,"rashi_name":"Vṛṣabha"},"moon":{"sidereal_longitude":184.4169,"rashi":7,"rashi_name":"Tulā"},"tithi":{"number":13,"name":"Trayodaśī","paksha":"Śukla","full_name":"Śukla Trayodaśī","elongation_degrees":151.842,"elapsed_within_tithi_degrees":7.842},"nakshatra":{"number":14,"name":"Citrā","pada":4,"moon_longitude":184.4169,"elapsed_within_degrees":11.0836},"yoga":{"number":17,"name":"Vyatīpāta","sum_longitude":216.9918},"karana":{"half_tithi_index":25,"name":"Taitila"},"vara":{"number":4,"name":"Maṅgalavāra (Tuesday)"}},"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":5,"day":18,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2461543.770833,"ahargana":1873078.2708,"kali_year":5129,"ayanamsa_lahiri":24.2354,"grahas":{"sun":{"sidereal_longitude":32.67108400000001,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":3,"name":"Kṛttikā","pada":2},"retrograde":false},"moon":{"sidereal_longitude":183.89498400000002,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":14,"name":"Citrā","pada":4},"retrograde":false,"latitude":-4.2039},"mars":{"sidereal_longitude":126.69888400000002,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":51.797484,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":114.34848399999998,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Aśleṣā","pada":3},"retrograde":false},"venus":{"sidereal_longitude":9.25138400000003,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":358.374884,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":4},"retrograde":false},"rahu":{"sidereal_longitude":295.2993,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":115.2993,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","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":2027,"month":5,"day":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2461543.770833,"kali_year":5129,"ahargana":1873078.2708,"sun":{"sidereal_longitude":32.5749,"rashi":2,"rashi_name":"Vṛṣabha"},"moon":{"sidereal_longitude":184.4169,"rashi":7,"rashi_name":"Tulā"},"tithi":{"number":13,"name":"Trayodaśī","paksha":"Śukla","full_name":"Śukla Trayodaśī","elongation_degrees":151.842,"elapsed_within_tithi_degrees":7.842},"nakshatra":{"number":14,"name":"Citrā","pada":4,"moon_longitude":184.4169,"elapsed_within_degrees":11.0836},"yoga":{"number":17,"name":"Vyatīpāta","sum_longitude":216.9918},"karana":{"half_tithi_index":25,"name":"Taitila"},"vara":{"number":4,"name":"Maṅgalavāra (Tuesday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-4.204,"elongation":151.842},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-4.204,"opposition_distance":28.158}},"eclipse_window_40days":[]},"city":{"slug":"chicago","name":"Chicago, USA","lat":41.8781,"lon":-87.6298,"tz_offset_hours":-6,"country":"US","tier":"diaspora"},"tier2":{"city":{"slug":"chicago","name":"Chicago, USA","lat":41.8781,"lon":-87.6298,"tz_offset_hours":-6,"country":"US","tier":"diaspora"},"sunriseLocal":"04:28","sunsetLocal":"19:06","solarNoonLocal":"11:47","dayLengthHours":14.63044826536904,"dayLengthDisplay":"14 Hours 37 Mins 50 Secs","nightLengthDisplay":"9 Hours 22 Mins 10 Secs","moonriseLocal":"16:28","moonsetLocal":"03:16","rahuKala":{"name":"Rāhu Kāla","start":"15:26","end":"17:16","startHours":15.438112363167768,"endHours":17.266918396338898,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"08:07","end":"09:57","startHours":8.122888230483248,"endHours":9.951694263654378,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"11:47","end":"13:37","startHours":11.780500296825508,"endHours":13.609306329996638,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"07:53","end":"08:22","startHours":7.879047426060431,"endHours":8.366729034906065,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"05:04","end":"05:28","startHours":5.074878175198031,"endHours":5.465023462274539,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:18","end":"12:16","startHours":11.292818687979873,"endHours":12.268181905671144,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"02:31","end":"03:29","startHours":2.5145497287584497,"endHours":3.489912946449719,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"03:15","end":"04:28","startHours":3.246072142026901,"endHours":4.465276164140988,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:13","end":"15:12","startHours":14.218908341053682,"endHours":15.194271558744951,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:54","end":"19:18","startHours":18.89572442951003,"endHours":19.295724429510027,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"19:06","end":"19:42","startHours":19.095724429510028,"endHours":19.70532644056707,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:51","end":"20:36","startHours":18.845724429510028,"endHours":20.595724429510028,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:18","end":"00:16","startHours":23.292818687979874,"endHours":24.268181905671142,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Roga","start":"04:28","end":"06:18","startHours":4.465276164140988,"endHours":6.294082197312118,"quality":"inauspicious"},{"name":"Udveg","start":"06:18","end":"08:07","startHours":6.294082197312118,"endHours":8.122888230483248,"quality":"inauspicious"},{"name":"Chala","start":"08:07","end":"09:57","startHours":8.122888230483248,"endHours":9.951694263654378,"quality":"neutral"},{"name":"Labha","start":"09:57","end":"11:47","startHours":9.951694263654378,"endHours":11.780500296825508,"quality":"auspicious"},{"name":"Amṛta","start":"11:47","end":"13:37","startHours":11.780500296825508,"endHours":13.609306329996638,"quality":"auspicious"},{"name":"Kāla","start":"13:37","end":"15:26","startHours":13.609306329996638,"endHours":15.438112363167768,"quality":"inauspicious"},{"name":"Śubha","start":"15:26","end":"17:16","startHours":15.438112363167768,"endHours":17.266918396338898,"quality":"auspicious"},{"name":"Roga","start":"17:16","end":"19:06","startHours":17.266918396338898,"endHours":19.095724429510028,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Kāla","start":"19:06","end":"20:16","startHours":19.095724429510028,"endHours":20.266918396338898,"quality":"inauspicious"},{"name":"Śubha","start":"20:16","end":"21:26","startHours":20.266918396338898,"endHours":21.438112363167768,"quality":"auspicious"},{"name":"Roga","start":"21:26","end":"22:37","startHours":21.438112363167768,"endHours":22.609306329996638,"quality":"inauspicious"},{"name":"Udveg","start":"22:37","end":"23:47","startHours":22.609306329996638,"endHours":23.780500296825508,"quality":"inauspicious"},{"name":"Chala","start":"23:47","end":"00:57","startHours":23.780500296825508,"endHours":24.951694263654378,"quality":"neutral"},{"name":"Labha","start":"00:57","end":"02:07","startHours":24.951694263654378,"endHours":26.122888230483248,"quality":"auspicious"},{"name":"Amṛta","start":"02:07","end":"03:18","startHours":26.122888230483248,"endHours":27.294082197312118,"quality":"auspicious"},{"name":"Kāla","start":"03:18","end":"04:28","startHours":27.294082197312118,"endHours":28.465276164140988,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"04:28","end":"05:28","startHours":4.465276164140988,"endHours":5.465276164140988,"planetary_lord":"Mars"},{"name":"Hora 2","start":"05:28","end":"06:28","startHours":5.465276164140988,"endHours":6.465276164140988,"planetary_lord":"Jupiter"},{"name":"Hora 3","start":"06:28","end":"07:28","startHours":6.465276164140988,"endHours":7.465276164140988,"planetary_lord":"Saturn"},{"name":"Hora 4","start":"07:28","end":"08:28","startHours":7.465276164140988,"endHours":8.465276164140988,"planetary_lord":"Moon"},{"name":"Hora 5","start":"08:28","end":"09:28","startHours":8.465276164140988,"endHours":9.465276164140988,"planetary_lord":"Mercury"},{"name":"Hora 6","start":"09:28","end":"10:28","startHours":9.465276164140988,"endHours":10.465276164140988,"planetary_lord":"Venus"},{"name":"Hora 7","start":"10:28","end":"11:28","startHours":10.465276164140988,"endHours":11.465276164140988,"planetary_lord":"Sun"},{"name":"Hora 8","start":"11:28","end":"12:28","startHours":11.465276164140988,"endHours":12.465276164140988,"planetary_lord":"Mars"},{"name":"Hora 9","start":"12:28","end":"13:28","startHours":12.465276164140988,"endHours":13.465276164140988,"planetary_lord":"Jupiter"},{"name":"Hora 10","start":"13:28","end":"14:28","startHours":13.465276164140988,"endHours":14.465276164140988,"planetary_lord":"Saturn"},{"name":"Hora 11","start":"14:28","end":"15:28","startHours":14.465276164140988,"endHours":15.465276164140988,"planetary_lord":"Moon"},{"name":"Hora 12","start":"15:28","end":"16:28","startHours":15.465276164140988,"endHours":16.465276164140988,"planetary_lord":"Mercury"},{"name":"Hora 13","start":"16:28","end":"17:28","startHours":16.465276164140988,"endHours":17.465276164140988,"planetary_lord":"Venus"},{"name":"Hora 14","start":"17:28","end":"18:28","startHours":17.465276164140988,"endHours":18.465276164140988,"planetary_lord":"Sun"},{"name":"Hora 15","start":"18:28","end":"19:28","startHours":18.465276164140988,"endHours":19.465276164140988,"planetary_lord":"Mars"},{"name":"Hora 16","start":"19:28","end":"20:28","startHours":19.465276164140988,"endHours":20.465276164140988,"planetary_lord":"Jupiter"},{"name":"Hora 17","start":"20:28","end":"21:28","startHours":20.465276164140988,"endHours":21.465276164140988,"planetary_lord":"Saturn"},{"name":"Hora 18","start":"21:28","end":"22:28","startHours":21.465276164140988,"endHours":22.465276164140988,"planetary_lord":"Moon"},{"name":"Hora 19","start":"22:28","end":"23:28","startHours":22.465276164140988,"endHours":23.465276164140988,"planetary_lord":"Mercury"},{"name":"Hora 20","start":"23:28","end":"00:28","startHours":23.465276164140988,"endHours":24.465276164140988,"planetary_lord":"Venus"},{"name":"Hora 21","start":"00:28","end":"01:28","startHours":24.465276164140988,"endHours":25.465276164140988,"planetary_lord":"Sun"},{"name":"Hora 22","start":"01:28","end":"02:28","startHours":25.465276164140988,"endHours":26.465276164140988,"planetary_lord":"Mars"},{"name":"Hora 23","start":"02:28","end":"03:28","startHours":26.465276164140988,"endHours":27.465276164140988,"planetary_lord":"Jupiter"},{"name":"Hora 24","start":"03:28","end":"04:28","startHours":27.465276164140988,"endHours":28.465276164140988,"planetary_lord":"Saturn"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Ārdrā","Punarvasu","Puṣya","Aśleṣā","Maghā","Svātī","Viśākhā","Anurādhā","Jyeṣṭhā","Mūla","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Bharaṇī","Kṛttikā","Rohiṇī","Mṛgaśirā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Citrā","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Meṣa","Karka","Siṃha","Tulā","Dhanu","Mīna"],"unfavorable_rashis":["Vṛṣabha","Mithuna","Kanyā","Vṛścika","Makara","Kumbha"]},"dishaShool":"North (Uttara)","chandraVasa":"North","rahuVasa":"North","anandadiYoga":{"name":"Mausala","quality":"Inauspicious"},"drikRitu":"Vasanta (Spring)","vedicRitu":"Vasanta (Spring)","drikAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":19.46387789839689,"eotMinutes":3.6891821904695723,"ayanamsa":24.2354}},"calendars":{"vikram_samvat":2084,"vikram_samvatsara":"Raudra","saka_samvat":1949,"saka_samvatsara":"Plavaṅga","bengali_samvat":1434,"malayalam_era":1203,"nanakshahi_year":558,"lunar_month":"Jyeṣṭha","lunar_month_paksha_full":"Jyeṣṭha Śukla Pakṣa","solar_month":"Vṛṣabha (Vaikāsi)","ritu":"Grīṣma (Summer)","display_summary":"Jyeṣṭha Śukla Trayodaśī · Vikram 2084 Raudra · Śaka 1949 Plavaṅga"},"festivals":[{"id":"vrishabha-sankranti","name":"Vṛṣabha Saṅkrānti","name_sanskrit":"वृषभ सङ्क्रान्ति","tradition":"Pan-Hindu","significance":"Sun enters Taurus.","vrata":false,"detection":{"sun_rashi":"Vṛṣabha"},"precedence":5},{"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":"mangala-walk","name":"Maṅgala Walk","name_sanskrit":"मङ्गल यात्रा","type":"graha","description":"Right action + BG 2.31-38 (kṣatriya-dharma).","step_count":7,"url":"/walk/mangala-walk"},"reason":"Maṅgalavāra (Tuesday) — its presiding graha's walk."},"cosmic_resonances":[]},"validity":{"eternal":false,"location_specific":"chicago"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga May 18, 2027 CE · Chicago, USA · Vidhyamitra","description":"May 18, 2027 CE for Chicago, USA: Śukla Trayodaśī, sūryodaya 04:28, sūryāsta 19:06.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/chicago/2027-05-18","hreflang_alternates":{"en":"https://vidhyamitra.com/city/chicago/2027-05-18","sa":"https://sa.vidhyamitra.com/city/chicago/2027-05-18","hi":"https://hi.vidhyamitra.com/city/chicago/2027-05-18","x-default":"https://vidhyamitra.com/city/chicago/2027-05-18"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-14T17:23:24.382Z","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":"2026-05-14T17:23:24.382Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-14T17:23:24.382Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}