{"id":"vidhyamitra:city-day:perth:1983-04-17:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1983-04-17","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1983-04-17","date_display":"April 17, 1983 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":1983,"month":4,"day":17,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2445441.770833,"kali_year":5085,"ahargana":1856976.2708,"sun":{"sidereal_longitude":3.02,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":49.2155,"rashi":2,"rashi_name":"Vṛṣabha"},"tithi":{"number":4,"name":"Caturthī","paksha":"Śukla","full_name":"Śukla Caturthī","elongation_degrees":46.1955,"elapsed_within_tithi_degrees":10.1955},"nakshatra":{"number":4,"name":"Rohiṇī","pada":3,"moon_longitude":49.2155,"elapsed_within_degrees":9.2155},"yoga":{"number":4,"name":"Saubhāgya","sum_longitude":52.2355},"karana":{"half_tithi_index":7,"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":1983,"month":4,"day":17,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2445441.770833,"ahargana":1856976.2708,"kali_year":5085,"ayanamsa_lahiri":23.6196,"grahas":{"sun":{"sidereal_longitude":2.8579990000000066,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":1},"retrograde":false},"moon":{"sidereal_longitude":49.359999000000016,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":3},"retrograde":false,"latitude":-1.4819},"mars":{"sidereal_longitude":15.077698999999996,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":2,"name":"Bharaṇī","pada":1},"retrograde":false},"mercury":{"sidereal_longitude":22.272599000000014,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":2,"name":"Bharaṇī","pada":3},"retrograde":false},"jupiter":{"sidereal_longitude":227.44309899999996,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":18,"name":"Jyeṣṭhā","pada":1},"retrograde":true},"venus":{"sidereal_longitude":40.829699000000005,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":1},"retrograde":false},"saturn":{"sidereal_longitude":187.57779900000003,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":68.4608,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":6,"name":"Ārdrā","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":248.4608,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","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":1983,"month":4,"day":17,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2445441.770833,"kali_year":5085,"ahargana":1856976.2708,"sun":{"sidereal_longitude":3.02,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":49.2155,"rashi":2,"rashi_name":"Vṛṣabha"},"tithi":{"number":4,"name":"Caturthī","paksha":"Śukla","full_name":"Śukla Caturthī","elongation_degrees":46.1955,"elapsed_within_tithi_degrees":10.1955},"nakshatra":{"number":4,"name":"Rohiṇī","pada":3,"moon_longitude":49.2155,"elapsed_within_degrees":9.2155},"yoga":{"number":4,"name":"Saubhāgya","sum_longitude":52.2355},"karana":{"half_tithi_index":7,"name":"Viṣṭi"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-1.482,"elongation":46.195},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-1.482,"opposition_distance":133.805}},"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":"06:38","sunsetLocal":"17:54","solarNoonLocal":"12:16","dayLengthHours":11.273423476558222,"dayLengthDisplay":"11 Hours 16 Mins 24 Secs","nightLengthDisplay":"12 Hours 43 Mins 36 Secs","moonriseLocal":"10:19","moonsetLocal":"20:26","rahuKala":{"name":"Rāhu Kāla","start":"16:30","end":"17:54","startHours":16.499099654047168,"endHours":17.908277588616947,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"12:16","end":"13:41","startHours":12.271565850337836,"endHours":13.680743784907612,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"15:05","end":"16:30","startHours":15.089921719477392,"endHours":16.499099654047168,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:16","end":"09:38","startHours":9.26531958992231,"endHours":9.64110037247425,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:06","end":"07:24","startHours":7.104580090248651,"endHours":7.4052047162902035,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:54","end":"12:39","startHours":11.895785067785896,"endHours":12.647346632889777,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:08","end":"05:53","startHours":5.131730981850962,"endHours":5.883292546954843,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:42","end":"06:38","startHours":5.695402155678873,"endHours":6.634854112058725,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:09","end":"14:54","startHours":14.15046976309754,"endHours":14.90203132820142,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:42","end":"18:06","startHours":17.708277588616948,"endHours":18.108277588616946,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:54","end":"18:23","startHours":17.908277588616947,"endHours":18.378003566806875,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:39","end":"19:24","startHours":17.658277588616947,"endHours":19.408277588616947,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:54","end":"00:39","startHours":23.895785067785894,"endHours":24.64734663288978,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Udveg","start":"06:38","end":"08:03","startHours":6.634854112058725,"endHours":8.044032046628502,"quality":"inauspicious"},{"name":"Chala","start":"08:03","end":"09:27","startHours":8.044032046628502,"endHours":9.453209981198281,"quality":"neutral"},{"name":"Labha","start":"09:27","end":"10:52","startHours":9.453209981198281,"endHours":10.862387915768057,"quality":"auspicious"},{"name":"Amṛta","start":"10:52","end":"12:16","startHours":10.862387915768057,"endHours":12.271565850337836,"quality":"auspicious"},{"name":"Kāla","start":"12:16","end":"13:41","startHours":12.271565850337836,"endHours":13.680743784907612,"quality":"inauspicious"},{"name":"Śubha","start":"13:41","end":"15:05","startHours":13.680743784907612,"endHours":15.089921719477392,"quality":"auspicious"},{"name":"Roga","start":"15:05","end":"16:30","startHours":15.089921719477392,"endHours":16.499099654047168,"quality":"inauspicious"},{"name":"Udveg","start":"16:30","end":"17:54","startHours":16.499099654047168,"endHours":17.908277588616947,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Śubha","start":"17:54","end":"19:30","startHours":17.908277588616947,"endHours":19.49909965404717,"quality":"auspicious"},{"name":"Roga","start":"19:30","end":"21:05","startHours":19.49909965404717,"endHours":21.089921719477392,"quality":"inauspicious"},{"name":"Udveg","start":"21:05","end":"22:41","startHours":21.089921719477392,"endHours":22.680743784907612,"quality":"inauspicious"},{"name":"Chala","start":"22:41","end":"00:16","startHours":22.680743784907612,"endHours":24.271565850337836,"quality":"neutral"},{"name":"Labha","start":"00:16","end":"01:52","startHours":24.271565850337836,"endHours":25.86238791576806,"quality":"auspicious"},{"name":"Amṛta","start":"01:52","end":"03:27","startHours":25.86238791576806,"endHours":27.45320998119828,"quality":"auspicious"},{"name":"Kāla","start":"03:27","end":"05:03","startHours":27.45320998119828,"endHours":29.0440320466285,"quality":"inauspicious"},{"name":"Śubha","start":"05:03","end":"06:38","startHours":29.0440320466285,"endHours":30.634854112058726,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"06:38","end":"07:38","startHours":6.634854112058725,"endHours":7.634854112058725,"planetary_lord":"Sun"},{"name":"Hora 2","start":"07:38","end":"08:38","startHours":7.634854112058725,"endHours":8.634854112058726,"planetary_lord":"Mars"},{"name":"Hora 3","start":"08:38","end":"09:38","startHours":8.634854112058726,"endHours":9.634854112058726,"planetary_lord":"Jupiter"},{"name":"Hora 4","start":"09:38","end":"10:38","startHours":9.634854112058726,"endHours":10.634854112058726,"planetary_lord":"Saturn"},{"name":"Hora 5","start":"10:38","end":"11:38","startHours":10.634854112058726,"endHours":11.634854112058726,"planetary_lord":"Moon"},{"name":"Hora 6","start":"11:38","end":"12:38","startHours":11.634854112058726,"endHours":12.634854112058726,"planetary_lord":"Mercury"},{"name":"Hora 7","start":"12:38","end":"13:38","startHours":12.634854112058726,"endHours":13.634854112058726,"planetary_lord":"Venus"},{"name":"Hora 8","start":"13:38","end":"14:38","startHours":13.634854112058726,"endHours":14.634854112058726,"planetary_lord":"Sun"},{"name":"Hora 9","start":"14:38","end":"15:38","startHours":14.634854112058726,"endHours":15.634854112058726,"planetary_lord":"Mars"},{"name":"Hora 10","start":"15:38","end":"16:38","startHours":15.634854112058726,"endHours":16.634854112058726,"planetary_lord":"Jupiter"},{"name":"Hora 11","start":"16:38","end":"17:38","startHours":16.634854112058726,"endHours":17.634854112058726,"planetary_lord":"Saturn"},{"name":"Hora 12","start":"17:38","end":"18:38","startHours":17.634854112058726,"endHours":18.634854112058726,"planetary_lord":"Moon"},{"name":"Hora 13","start":"18:38","end":"19:38","startHours":18.634854112058726,"endHours":19.634854112058726,"planetary_lord":"Mercury"},{"name":"Hora 14","start":"19:38","end":"20:38","startHours":19.634854112058726,"endHours":20.634854112058726,"planetary_lord":"Venus"},{"name":"Hora 15","start":"20:38","end":"21:38","startHours":20.634854112058726,"endHours":21.634854112058726,"planetary_lord":"Sun"},{"name":"Hora 16","start":"21:38","end":"22:38","startHours":21.634854112058726,"endHours":22.634854112058726,"planetary_lord":"Mars"},{"name":"Hora 17","start":"22:38","end":"23:38","startHours":22.634854112058726,"endHours":23.634854112058726,"planetary_lord":"Jupiter"},{"name":"Hora 18","start":"23:38","end":"00:38","startHours":23.634854112058726,"endHours":24.634854112058726,"planetary_lord":"Saturn"},{"name":"Hora 19","start":"00:38","end":"01:38","startHours":24.634854112058726,"endHours":25.634854112058726,"planetary_lord":"Moon"},{"name":"Hora 20","start":"01:38","end":"02:38","startHours":25.634854112058726,"endHours":26.634854112058726,"planetary_lord":"Mercury"},{"name":"Hora 21","start":"02:38","end":"03:38","startHours":26.634854112058726,"endHours":27.634854112058726,"planetary_lord":"Venus"},{"name":"Hora 22","start":"03:38","end":"04:38","startHours":27.634854112058726,"endHours":28.634854112058726,"planetary_lord":"Sun"},{"name":"Hora 23","start":"04:38","end":"05:38","startHours":28.634854112058726,"endHours":29.634854112058726,"planetary_lord":"Mars"},{"name":"Hora 24","start":"05:38","end":"06:38","startHours":29.634854112058726,"endHours":30.634854112058726,"planetary_lord":"Jupiter"}],"taraBala":{"favorable_nakshatras":["Mṛgaśirā","Ārdrā","Punarvasu","Puṣya","Aśleṣā","Citrā","Svātī","Viśākhā","Anurādhā","Jyeṣṭhā","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Rohiṇī","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Vṛṣabha","Karka","Tulā","Vṛścika","Kumbha","Mīna"],"unfavorable_rashis":["Meṣa","Mithuna","Siṃha","Kanyā","Dhanu","Makara"]},"dishaShool":"West (Paścim)","chandraVasa":"South-East","rahuVasa":"North-East","anandadiYoga":{"name":"Prajāpati","quality":"Auspicious"},"tropicalRitu":"Vasanta (Spring)","vedicRitu":"Vasanta (Spring)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":10.214172175238037,"eotMinutes":0.2640489797298191,"ayanamsa":23.6196}},"calendars":{"vikram_samvat":2040,"vikram_samvatsara":"Dhātṛ","saka_samvat":1905,"saka_samvatsara":"Rudhirodgāri","bengali_samvat":1390,"malayalam_era":1159,"nanakshahi_year":514,"lunar_month":"Caitra","lunar_month_paksha_full":"Caitra Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Caitra","lunar_month_amanta":"Caitra","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Mēsha (Cittirai / Vaiśākhī)","ritu":"Vasanta (Spring)","display_summary":"Caitra Śukla Caturthī · Vikram 2040 Dhātṛ · Śaka 1905 Rudhirodgāri"},"festivals":[{"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":"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":"-3226-07-09","event":"Bhagavān Krishna's birth at Mathurā","chart_id":"krishna","shared_marker":"same Rohiṇī","url":"/day/-3226-07-09","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 April 17, 1983 CE · Perth, Australia · Vidhyamitra","description":"April 17, 1983 CE for Perth, Australia: Śukla Caturthī, sūryodaya 06:38, sūryāsta 17:54.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1983-04-17","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1983-04-17","sa":"https://sa.vidhyamitra.com/city/perth/1983-04-17","hi":"https://hi.vidhyamitra.com/city/perth/1983-04-17","x-default":"https://vidhyamitra.com/city/perth/1983-04-17"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-02T20:09:59.962Z","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":"2026-06-02T20:09:59.962Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-02T20:09:59.962Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}