{"id":"vidhyamitra:city-day:perth:2027-05-18:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/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":"perth","name":"Perth, Australia","lat":-31.9505,"lon":115.8605,"tz_offset_hours":8,"country":"AU","tier":"diaspora"},"tier2":{"city":{"slug":"perth","name":"Perth, Australia","lat":-31.9505,"lon":115.8605,"tz_offset_hours":8,"country":"AU","tier":"diaspora"},"sunriseLocal":"07:00","sunsetLocal":"17:26","solarNoonLocal":"12:13","dayLengthHours":10.444284940196006,"dayLengthDisplay":"10 Hours 26 Mins 39 Secs","nightLengthDisplay":"13 Hours 33 Mins 21 Secs","moonriseLocal":"15:48","moonsetLocal":"04:48","rahuKala":{"name":"Rāhu Kāla","start":"14:50","end":"16:08","startHours":14.825551531874506,"endHours":16.131087149399008,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"09:36","end":"10:55","startHours":9.603409061776503,"endHours":10.908944679301005,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"12:13","end":"13:31","startHours":12.214480296825506,"endHours":13.520015914350006,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:26","end":"09:47","startHours":9.429337646106571,"endHours":9.777480477446437,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:26","end":"07:42","startHours":7.427516365902336,"endHours":7.7060306309742295,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:52","end":"12:34","startHours":11.866337465485639,"endHours":12.562623128165374,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:36","end":"06:18","startHours":5.599766501368035,"endHours":6.296052164047769,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"06:07","end":"07:00","startHours":6.121980748377835,"endHours":6.9923378267275025,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"13:57","end":"14:39","startHours":13.95519445352484,"endHours":14.651480116204572,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:14","end":"17:38","startHours":17.23662276692351,"endHours":17.63662276692351,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:26","end":"17:52","startHours":17.43662276692351,"endHours":17.871801306098344,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:11","end":"18:56","startHours":17.18662276692351,"endHours":18.93662276692351,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:52","end":"00:34","startHours":23.86633746548564,"endHours":24.562623128165374,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Roga","start":"07:00","end":"08:18","startHours":6.9923378267275025,"endHours":8.297873444252003,"quality":"inauspicious"},{"name":"Udveg","start":"08:18","end":"09:36","startHours":8.297873444252003,"endHours":9.603409061776503,"quality":"inauspicious"},{"name":"Chala","start":"09:36","end":"10:55","startHours":9.603409061776503,"endHours":10.908944679301005,"quality":"neutral"},{"name":"Labha","start":"10:55","end":"12:13","startHours":10.908944679301005,"endHours":12.214480296825506,"quality":"auspicious"},{"name":"Amṛta","start":"12:13","end":"13:31","startHours":12.214480296825506,"endHours":13.520015914350006,"quality":"auspicious"},{"name":"Kāla","start":"13:31","end":"14:50","startHours":13.520015914350006,"endHours":14.825551531874506,"quality":"inauspicious"},{"name":"Śubha","start":"14:50","end":"16:08","startHours":14.825551531874506,"endHours":16.131087149399008,"quality":"auspicious"},{"name":"Roga","start":"16:08","end":"17:26","startHours":16.131087149399008,"endHours":17.43662276692351,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Kāla","start":"17:26","end":"19:08","startHours":17.43662276692351,"endHours":19.131087149399008,"quality":"inauspicious"},{"name":"Śubha","start":"19:08","end":"20:50","startHours":19.131087149399008,"endHours":20.82555153187451,"quality":"auspicious"},{"name":"Roga","start":"20:50","end":"22:31","startHours":20.82555153187451,"endHours":22.520015914350008,"quality":"inauspicious"},{"name":"Udveg","start":"22:31","end":"00:13","startHours":22.520015914350008,"endHours":24.214480296825506,"quality":"inauspicious"},{"name":"Chala","start":"00:13","end":"01:55","startHours":24.214480296825506,"endHours":25.908944679301005,"quality":"neutral"},{"name":"Labha","start":"01:55","end":"03:36","startHours":25.908944679301005,"endHours":27.603409061776503,"quality":"auspicious"},{"name":"Amṛta","start":"03:36","end":"05:18","startHours":27.603409061776503,"endHours":29.297873444252005,"quality":"auspicious"},{"name":"Kāla","start":"05:18","end":"07:00","startHours":29.297873444252005,"endHours":30.992337826727503,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"07:00","end":"08:00","startHours":6.9923378267275025,"endHours":7.9923378267275025,"planetary_lord":"Mars"},{"name":"Hora 2","start":"08:00","end":"09:00","startHours":7.9923378267275025,"endHours":8.992337826727503,"planetary_lord":"Jupiter"},{"name":"Hora 3","start":"09:00","end":"10:00","startHours":8.992337826727503,"endHours":9.992337826727503,"planetary_lord":"Saturn"},{"name":"Hora 4","start":"10:00","end":"11:00","startHours":9.992337826727503,"endHours":10.992337826727503,"planetary_lord":"Moon"},{"name":"Hora 5","start":"11:00","end":"12:00","startHours":10.992337826727503,"endHours":11.992337826727503,"planetary_lord":"Mercury"},{"name":"Hora 6","start":"12:00","end":"13:00","startHours":11.992337826727503,"endHours":12.992337826727503,"planetary_lord":"Venus"},{"name":"Hora 7","start":"13:00","end":"14:00","startHours":12.992337826727503,"endHours":13.992337826727503,"planetary_lord":"Sun"},{"name":"Hora 8","start":"14:00","end":"15:00","startHours":13.992337826727503,"endHours":14.992337826727503,"planetary_lord":"Mars"},{"name":"Hora 9","start":"15:00","end":"16:00","startHours":14.992337826727503,"endHours":15.992337826727503,"planetary_lord":"Jupiter"},{"name":"Hora 10","start":"16:00","end":"17:00","startHours":15.992337826727503,"endHours":16.992337826727503,"planetary_lord":"Saturn"},{"name":"Hora 11","start":"17:00","end":"18:00","startHours":16.992337826727503,"endHours":17.992337826727503,"planetary_lord":"Moon"},{"name":"Hora 12","start":"18:00","end":"19:00","startHours":17.992337826727503,"endHours":18.992337826727503,"planetary_lord":"Mercury"},{"name":"Hora 13","start":"19:00","end":"20:00","startHours":18.992337826727503,"endHours":19.992337826727503,"planetary_lord":"Venus"},{"name":"Hora 14","start":"20:00","end":"21:00","startHours":19.992337826727503,"endHours":20.992337826727503,"planetary_lord":"Sun"},{"name":"Hora 15","start":"21:00","end":"22:00","startHours":20.992337826727503,"endHours":21.992337826727503,"planetary_lord":"Mars"},{"name":"Hora 16","start":"22:00","end":"23:00","startHours":21.992337826727503,"endHours":22.992337826727503,"planetary_lord":"Jupiter"},{"name":"Hora 17","start":"23:00","end":"00:00","startHours":22.992337826727503,"endHours":23.992337826727503,"planetary_lord":"Saturn"},{"name":"Hora 18","start":"00:00","end":"01:00","startHours":23.992337826727503,"endHours":24.992337826727503,"planetary_lord":"Moon"},{"name":"Hora 19","start":"01:00","end":"02:00","startHours":24.992337826727503,"endHours":25.992337826727503,"planetary_lord":"Mercury"},{"name":"Hora 20","start":"02:00","end":"03:00","startHours":25.992337826727503,"endHours":26.992337826727503,"planetary_lord":"Venus"},{"name":"Hora 21","start":"03:00","end":"04:00","startHours":26.992337826727503,"endHours":27.992337826727503,"planetary_lord":"Sun"},{"name":"Hora 22","start":"04:00","end":"05:00","startHours":27.992337826727503,"endHours":28.992337826727503,"planetary_lord":"Mars"},{"name":"Hora 23","start":"05:00","end":"06:00","startHours":28.992337826727503,"endHours":29.992337826727503,"planetary_lord":"Jupiter"},{"name":"Hora 24","start":"06:00","end":"07:00","startHours":29.992337826727503,"endHours":30.992337826727503,"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":"perth"},"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 · Perth, Australia · Vidhyamitra","description":"May 18, 2027 CE for Perth, Australia: Śukla Trayodaśī, sūryodaya 07:00, sūryāsta 17:26.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/2027-05-18","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/2027-05-18","sa":"https://sa.vidhyamitra.com/city/perth/2027-05-18","hi":"https://hi.vidhyamitra.com/city/perth/2027-05-18","x-default":"https://vidhyamitra.com/city/perth/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":"2026-05-14T16:30:38.990Z","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":"2026-05-14T16:30:38.990Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-14T16:30:38.990Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}