{"id":"vidhyamitra:city-day:perth:1817-05-20:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1817-05-20","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1817-05-20","date_display":"May 20, 1817 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":1817,"month":5,"day":20,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2384844.770833,"kali_year":4919,"ahargana":1796379.2708,"sun":{"sidereal_longitude":37.6797,"rashi":2,"rashi_name":"Vṛṣabha"},"moon":{"sidereal_longitude":82.4948,"rashi":3,"rashi_name":"Mithuna"},"tithi":{"number":4,"name":"Caturthī","paksha":"Śukla","full_name":"Śukla Caturthī","elongation_degrees":44.815,"elapsed_within_tithi_degrees":8.815},"nakshatra":{"number":7,"name":"Punarvasu","pada":1,"moon_longitude":82.4948,"elapsed_within_degrees":2.4948},"yoga":{"number":10,"name":"Gaṇḍa","sum_longitude":120.1745},"karana":{"half_tithi_index":7,"name":"Viṣṭi"},"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":1817,"month":5,"day":20,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2384844.770833,"ahargana":1796379.2708,"kali_year":4919,"ayanamsa_lahiri":21.302,"grahas":{"sun":{"sidereal_longitude":37.314149999999984,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":3,"name":"Kṛttikā","pada":4},"retrograde":false},"moon":{"sidereal_longitude":79.22805,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":6,"name":"Ārdrā","pada":4},"retrograde":false,"latitude":3.0853},"mars":{"sidereal_longitude":338.2118499999999,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":2},"retrograde":false},"mercury":{"sidereal_longitude":62.12995000000001,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":5,"name":"Mr̥gaśirā","pada":3},"retrograde":false},"jupiter":{"sidereal_longitude":227.80764999999997,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":18,"name":"Jyeṣṭhā","pada":1},"retrograde":true},"venus":{"sidereal_longitude":43.05464999999998,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":1},"retrograde":true},"saturn":{"sidereal_longitude":315.88514999999995,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":3},"retrograde":false},"rahu":{"sidereal_longitude":39.1814,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":3,"name":"Kṛttikā","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":219.1814,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","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":1817,"month":5,"day":20,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2384844.770833,"kali_year":4919,"ahargana":1796379.2708,"sun":{"sidereal_longitude":37.6797,"rashi":2,"rashi_name":"Vṛṣabha"},"moon":{"sidereal_longitude":82.4948,"rashi":3,"rashi_name":"Mithuna"},"tithi":{"number":4,"name":"Caturthī","paksha":"Śukla","full_name":"Śukla Caturthī","elongation_degrees":44.815,"elapsed_within_tithi_degrees":8.815},"nakshatra":{"number":7,"name":"Punarvasu","pada":1,"moon_longitude":82.4948,"elapsed_within_degrees":2.4948},"yoga":{"number":10,"name":"Gaṇḍa","sum_longitude":120.1745},"karana":{"half_tithi_index":7,"name":"Viṣṭi"},"vara":{"number":4,"name":"Maṅgalavāra (Tuesday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":3.085,"elongation":44.815},"lunar":{"type":"lunar","occurs":false,"moon_latitude":3.085,"opposition_distance":135.185}},"eclipse_window_40days":[{"offset_days":-4,"type":"solar","occurs":true,"moon_latitude":-0.618,"elongation":2.359}]},"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":"07:01","sunsetLocal":"17:25","solarNoonLocal":"12:13","dayLengthHours":10.407729528503182,"dayLengthDisplay":"10 Hours 24 Mins 28 Secs","nightLengthDisplay":"13 Hours 35 Mins 32 Secs","moonriseLocal":"09:59","moonsetLocal":"20:02","rahuKala":{"name":"Rāhu Kāla","start":"14:49","end":"16:07","startHours":14.817927165189374,"endHours":16.118893356252272,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"09:37","end":"10:55","startHours":9.614062400937783,"endHours":10.91502859200068,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"12:13","end":"13:31","startHours":12.215994783063579,"endHours":13.516960974126476,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:26","end":"09:47","startHours":9.440600242129396,"endHours":9.787524559746169,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:27","end":"07:43","startHours":7.445785415832953,"endHours":7.723324869926371,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:52","end":"12:34","startHours":11.869070465446805,"endHours":12.562919100680352,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:37","end":"06:19","startHours":5.624432748344896,"endHours":6.318281383578441,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"06:09","end":"07:01","startHours":6.144819224770055,"endHours":7.012130018811987,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"13:57","end":"14:39","startHours":13.95061637114744,"endHours":14.644465006380985,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:13","end":"17:37","startHours":17.21985954731517,"endHours":17.61985954731517,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:25","end":"17:51","startHours":17.41985954731517,"endHours":17.853514944336137,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:10","end":"18:55","startHours":17.16985954731517,"endHours":18.91985954731517,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:52","end":"00:34","startHours":23.869070465446807,"endHours":24.56291910068035,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Roga","start":"07:01","end":"08:19","startHours":7.012130018811987,"endHours":8.313096209874885,"quality":"inauspicious"},{"name":"Udveg","start":"08:19","end":"09:37","startHours":8.313096209874885,"endHours":9.614062400937783,"quality":"inauspicious"},{"name":"Chala","start":"09:37","end":"10:55","startHours":9.614062400937783,"endHours":10.91502859200068,"quality":"neutral"},{"name":"Labha","start":"10:55","end":"12:13","startHours":10.91502859200068,"endHours":12.215994783063579,"quality":"auspicious"},{"name":"Amṛta","start":"12:13","end":"13:31","startHours":12.215994783063579,"endHours":13.516960974126476,"quality":"auspicious"},{"name":"Kāla","start":"13:31","end":"14:49","startHours":13.516960974126476,"endHours":14.817927165189374,"quality":"inauspicious"},{"name":"Śubha","start":"14:49","end":"16:07","startHours":14.817927165189374,"endHours":16.118893356252272,"quality":"auspicious"},{"name":"Roga","start":"16:07","end":"17:25","startHours":16.118893356252272,"endHours":17.41985954731517,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Kāla","start":"17:25","end":"19:07","startHours":17.41985954731517,"endHours":19.118893356252272,"quality":"inauspicious"},{"name":"Śubha","start":"19:07","end":"20:49","startHours":19.118893356252272,"endHours":20.817927165189374,"quality":"auspicious"},{"name":"Roga","start":"20:49","end":"22:31","startHours":20.817927165189374,"endHours":22.516960974126476,"quality":"inauspicious"},{"name":"Udveg","start":"22:31","end":"00:13","startHours":22.516960974126476,"endHours":24.21599478306358,"quality":"inauspicious"},{"name":"Chala","start":"00:13","end":"01:55","startHours":24.21599478306358,"endHours":25.91502859200068,"quality":"neutral"},{"name":"Labha","start":"01:55","end":"03:37","startHours":25.91502859200068,"endHours":27.614062400937783,"quality":"auspicious"},{"name":"Amṛta","start":"03:37","end":"05:19","startHours":27.614062400937783,"endHours":29.313096209874885,"quality":"auspicious"},{"name":"Kāla","start":"05:19","end":"07:01","startHours":29.313096209874885,"endHours":31.012130018811987,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"07:01","end":"08:01","startHours":7.012130018811987,"endHours":8.012130018811987,"planetary_lord":"Mars"},{"name":"Hora 2","start":"08:01","end":"09:01","startHours":8.012130018811987,"endHours":9.012130018811987,"planetary_lord":"Jupiter"},{"name":"Hora 3","start":"09:01","end":"10:01","startHours":9.012130018811987,"endHours":10.012130018811987,"planetary_lord":"Saturn"},{"name":"Hora 4","start":"10:01","end":"11:01","startHours":10.012130018811987,"endHours":11.012130018811987,"planetary_lord":"Moon"},{"name":"Hora 5","start":"11:01","end":"12:01","startHours":11.012130018811987,"endHours":12.012130018811987,"planetary_lord":"Mercury"},{"name":"Hora 6","start":"12:01","end":"13:01","startHours":12.012130018811987,"endHours":13.012130018811987,"planetary_lord":"Venus"},{"name":"Hora 7","start":"13:01","end":"14:01","startHours":13.012130018811987,"endHours":14.012130018811987,"planetary_lord":"Sun"},{"name":"Hora 8","start":"14:01","end":"15:01","startHours":14.012130018811987,"endHours":15.012130018811987,"planetary_lord":"Mars"},{"name":"Hora 9","start":"15:01","end":"16:01","startHours":15.012130018811987,"endHours":16.012130018811987,"planetary_lord":"Jupiter"},{"name":"Hora 10","start":"16:01","end":"17:01","startHours":16.012130018811987,"endHours":17.012130018811987,"planetary_lord":"Saturn"},{"name":"Hora 11","start":"17:01","end":"18:01","startHours":17.012130018811987,"endHours":18.012130018811987,"planetary_lord":"Moon"},{"name":"Hora 12","start":"18:01","end":"19:01","startHours":18.012130018811987,"endHours":19.012130018811987,"planetary_lord":"Mercury"},{"name":"Hora 13","start":"19:01","end":"20:01","startHours":19.012130018811987,"endHours":20.012130018811987,"planetary_lord":"Venus"},{"name":"Hora 14","start":"20:01","end":"21:01","startHours":20.012130018811987,"endHours":21.012130018811987,"planetary_lord":"Sun"},{"name":"Hora 15","start":"21:01","end":"22:01","startHours":21.012130018811987,"endHours":22.012130018811987,"planetary_lord":"Mars"},{"name":"Hora 16","start":"22:01","end":"23:01","startHours":22.012130018811987,"endHours":23.012130018811987,"planetary_lord":"Jupiter"},{"name":"Hora 17","start":"23:01","end":"00:01","startHours":23.012130018811987,"endHours":24.012130018811987,"planetary_lord":"Saturn"},{"name":"Hora 18","start":"00:01","end":"01:01","startHours":24.012130018811987,"endHours":25.012130018811987,"planetary_lord":"Moon"},{"name":"Hora 19","start":"01:01","end":"02:01","startHours":25.012130018811987,"endHours":26.012130018811987,"planetary_lord":"Mercury"},{"name":"Hora 20","start":"02:01","end":"03:01","startHours":26.012130018811987,"endHours":27.012130018811987,"planetary_lord":"Venus"},{"name":"Hora 21","start":"03:01","end":"04:01","startHours":27.012130018811987,"endHours":28.012130018811987,"planetary_lord":"Sun"},{"name":"Hora 22","start":"04:01","end":"05:01","startHours":28.012130018811987,"endHours":29.012130018811987,"planetary_lord":"Mars"},{"name":"Hora 23","start":"05:01","end":"06:01","startHours":29.012130018811987,"endHours":30.012130018811987,"planetary_lord":"Jupiter"},{"name":"Hora 24","start":"06:01","end":"07:01","startHours":30.012130018811987,"endHours":31.012130018811987,"planetary_lord":"Saturn"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Puṣya","Aśleṣā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Rohiṇī","Mṛgaśirā","Ārdrā","Punarvasu","Hasta","Citrā","Svātī","Viśākhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā"],"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":"North (Uttara)","chandraVasa":"South","rahuVasa":"North","anandadiYoga":{"name":"Lumba","quality":"Auspicious"},"tropicalRitu":"Vasanta (Spring)","vedicRitu":"Vasanta (Spring)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":19.84904919492421,"eotMinutes":3.5983130161851964,"ayanamsa":21.302}},"calendars":{"vikram_samvat":1874,"vikram_samvatsara":"Vikṛti","saka_samvat":1739,"saka_samvatsara":"Īśvara","bengali_samvat":1224,"malayalam_era":993,"nanakshahi_year":348,"lunar_month":"Jyeṣṭha","lunar_month_paksha_full":"Jyeṣṭha Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Jyeṣṭha","lunar_month_amanta":"Jyeṣṭha","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Vṛṣabha (Vaikāsi)","ritu":"Grīṣma (Summer)","display_summary":"Jyeṣṭha Śukla Caturthī · Vikram 1874 Vikṛti · Śaka 1739 Īśvara"},"festivals":[{"id":"angarika-chaturthi","name":"Aṅgāraka Caturthī (Tuesday Caturthī)","name_sanskrit":"अङ्गारक चतुर्थी","tradition":"Pan-Hindu","associated_deity":"Gaṇeśa + Maṅgala","significance":"Tuesday-Caturthī (rare); supremely auspicious for Maṅgala-doṣa-nivāraṇa.","vrata":true,"detection":{"any_of":[{"tithi_number":4,"vara_name":"Maṅgalavāra (Tuesday)"},{"tithi_number":19,"vara_name":"Maṅgalavāra (Tuesday)"}]},"precedence":3},{"id":"vinayaka-chaturthi","name":"Vināyaka Caturthī (monthly)","name_sanskrit":"विनायक चतुर्थी","tradition":"Pan-Hindu","associated_deity":"Gaṇeśa","significance":"Monthly Śukla-pakṣa Caturthī; auspicious for new ventures.","vrata":true,"detection":{"tithi_number":4,"tithi_paksha":"Śukla"},"precedence":6}],"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":[{"historical_date":"-1626101-04-03","event":"Bhagavān Rāma's birth at Ayodhyā","chart_id":"rama","shared_marker":"same Punarvasu","url":"/day/-1626101-04-03","relevance":0.5}]},"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 20, 1817 CE · Perth, Australia · Vidhyamitra","description":"May 20, 1817 CE for Perth, Australia: Śukla Caturthī, sūryodaya 07:01, sūryāsta 17:25.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1817-05-20","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1817-05-20","sa":"https://sa.vidhyamitra.com/city/perth/1817-05-20","hi":"https://hi.vidhyamitra.com/city/perth/1817-05-20","x-default":"https://vidhyamitra.com/city/perth/1817-05-20"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-05T00:49:54.962Z","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":"2026-06-05T00:49:54.962Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-05T00:49:54.962Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}