{"id":"vidhyamitra:city-day:perth:1983-12-20:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1983-12-20","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1983-12-20","date_display":"December 20, 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":12,"day":20,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2445688.770833,"kali_year":5085,"ahargana":1857223.2708,"sun":{"sidereal_longitude":243.6382,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":61.7246,"rashi":3,"rashi_name":"Mithuna"},"tithi":{"number":15,"name":"Pūrṇimā","paksha":"Śukla","full_name":"Śukla Pūrṇimā","elongation_degrees":178.0864,"elapsed_within_tithi_degrees":10.0864},"nakshatra":{"number":5,"name":"Mṛgaśīrṣā","pada":3,"moon_longitude":61.7246,"elapsed_within_degrees":8.3913},"yoga":{"number":23,"name":"Śubha","sum_longitude":305.3628},"karana":{"half_tithi_index":29,"name":"Bava"},"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":1983,"month":12,"day":20,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2445688.770833,"ahargana":1857223.2708,"kali_year":5085,"ayanamsa_lahiri":23.629,"grahas":{"sun":{"sidereal_longitude":243.944661,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":2},"retrograde":false},"moon":{"sidereal_longitude":63.406361000000004,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":5,"name":"Mr̥gaśirā","pada":4},"retrograde":false,"latitude":0.4973},"mars":{"sidereal_longitude":174.70796100000007,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":1},"retrograde":false},"mercury":{"sidereal_longitude":263.042861,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":3},"retrograde":false},"jupiter":{"sidereal_longitude":240.48286099999996,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":1},"retrograde":false},"venus":{"sidereal_longitude":202.20566099999996,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":16,"name":"Viśākhā","pada":1},"retrograde":false},"saturn":{"sidereal_longitude":198.86116100000004,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":4},"retrograde":false},"rahu":{"sidereal_longitude":55.3735,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":5,"name":"Mṛgaśīrṣā","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":235.3735,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":18,"name":"Jyeṣṭhā","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":12,"day":20,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2445688.770833,"kali_year":5085,"ahargana":1857223.2708,"sun":{"sidereal_longitude":243.6382,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":61.7246,"rashi":3,"rashi_name":"Mithuna"},"tithi":{"number":15,"name":"Pūrṇimā","paksha":"Śukla","full_name":"Śukla Pūrṇimā","elongation_degrees":178.0864,"elapsed_within_tithi_degrees":10.0864},"nakshatra":{"number":5,"name":"Mṛgaśīrṣā","pada":3,"moon_longitude":61.7246,"elapsed_within_degrees":8.3913},"yoga":{"number":23,"name":"Śubha","sum_longitude":305.3628},"karana":{"half_tithi_index":29,"name":"Bava"},"vara":{"number":4,"name":"Maṅgalavāra (Tuesday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":0.497,"elongation":178.086},"lunar":{"type":"lunar","occurs":true,"moon_latitude":0.497,"opposition_distance":1.914}},"eclipse_window_40days":[{"offset_days":0,"type":"lunar","occurs":true,"moon_latitude":0.497,"opposition_distance":1.914}]},"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":"05:08","sunsetLocal":"19:22","solarNoonLocal":"12:15","dayLengthHours":14.237677519770664,"dayLengthDisplay":"14 Hours 14 Mins 16 Secs","nightLengthDisplay":"9 Hours 45 Mins 44 Secs","moonriseLocal":"19:12","moonsetLocal":"05:13","rahuKala":{"name":"Rāhu Kāla","start":"15:48","end":"17:35","startHours":15.804520754568186,"endHours":17.584230444539518,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"08:41","end":"10:28","startHours":8.685681994682854,"endHours":10.465391684654186,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"12:15","end":"14:01","startHours":12.24510137462552,"endHours":14.024811064596854,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:27","end":"08:55","startHours":8.448387369353343,"endHours":8.922976620012365,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"05:43","end":"06:06","startHours":5.719499178063966,"endHours":6.099170578591184,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:46","end":"12:43","startHours":11.770512123966498,"endHours":12.719690625284542,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:14","end":"04:11","startHours":3.2279056121040997,"endHours":4.1770841134221435,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"03:56","end":"05:08","startHours":3.9397894880926327,"endHours":5.126262614740188,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:37","end":"15:34","startHours":14.618047627920632,"endHours":15.567226129238676,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"19:10","end":"19:34","startHours":19.163940134510852,"endHours":19.56394013451085,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"19:22","end":"19:57","startHours":19.36394013451085,"endHours":19.95717669783463,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"19:07","end":"20:52","startHours":19.11394013451085,"endHours":20.86394013451085,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:46","end":"00:43","startHours":23.770512123966498,"endHours":24.719690625284542,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Roga","start":"05:08","end":"06:54","startHours":5.126262614740188,"endHours":6.905972304711521,"quality":"inauspicious"},{"name":"Udveg","start":"06:54","end":"08:41","startHours":6.905972304711521,"endHours":8.685681994682854,"quality":"inauspicious"},{"name":"Chala","start":"08:41","end":"10:28","startHours":8.685681994682854,"endHours":10.465391684654186,"quality":"neutral"},{"name":"Labha","start":"10:28","end":"12:15","startHours":10.465391684654186,"endHours":12.24510137462552,"quality":"auspicious"},{"name":"Amṛta","start":"12:15","end":"14:01","startHours":12.24510137462552,"endHours":14.024811064596854,"quality":"auspicious"},{"name":"Kāla","start":"14:01","end":"15:48","startHours":14.024811064596854,"endHours":15.804520754568186,"quality":"inauspicious"},{"name":"Śubha","start":"15:48","end":"17:35","startHours":15.804520754568186,"endHours":17.584230444539518,"quality":"auspicious"},{"name":"Roga","start":"17:35","end":"19:22","startHours":17.584230444539518,"endHours":19.36394013451085,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Kāla","start":"19:22","end":"20:35","startHours":19.36394013451085,"endHours":20.584230444539518,"quality":"inauspicious"},{"name":"Śubha","start":"20:35","end":"21:48","startHours":20.584230444539518,"endHours":21.804520754568188,"quality":"auspicious"},{"name":"Roga","start":"21:48","end":"23:01","startHours":21.804520754568188,"endHours":23.024811064596854,"quality":"inauspicious"},{"name":"Udveg","start":"23:01","end":"00:15","startHours":23.024811064596854,"endHours":24.24510137462552,"quality":"inauspicious"},{"name":"Chala","start":"00:15","end":"01:28","startHours":24.24510137462552,"endHours":25.465391684654186,"quality":"neutral"},{"name":"Labha","start":"01:28","end":"02:41","startHours":25.465391684654186,"endHours":26.685681994682852,"quality":"auspicious"},{"name":"Amṛta","start":"02:41","end":"03:54","startHours":26.685681994682852,"endHours":27.905972304711522,"quality":"auspicious"},{"name":"Kāla","start":"03:54","end":"05:08","startHours":27.905972304711522,"endHours":29.126262614740188,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"05:08","end":"06:08","startHours":5.126262614740188,"endHours":6.126262614740188,"planetary_lord":"Mars"},{"name":"Hora 2","start":"06:08","end":"07:08","startHours":6.126262614740188,"endHours":7.126262614740188,"planetary_lord":"Jupiter"},{"name":"Hora 3","start":"07:08","end":"08:08","startHours":7.126262614740188,"endHours":8.126262614740188,"planetary_lord":"Saturn"},{"name":"Hora 4","start":"08:08","end":"09:08","startHours":8.126262614740188,"endHours":9.126262614740188,"planetary_lord":"Moon"},{"name":"Hora 5","start":"09:08","end":"10:08","startHours":9.126262614740188,"endHours":10.126262614740188,"planetary_lord":"Mercury"},{"name":"Hora 6","start":"10:08","end":"11:08","startHours":10.126262614740188,"endHours":11.126262614740188,"planetary_lord":"Venus"},{"name":"Hora 7","start":"11:08","end":"12:08","startHours":11.126262614740188,"endHours":12.126262614740188,"planetary_lord":"Sun"},{"name":"Hora 8","start":"12:08","end":"13:08","startHours":12.126262614740188,"endHours":13.126262614740188,"planetary_lord":"Mars"},{"name":"Hora 9","start":"13:08","end":"14:08","startHours":13.126262614740188,"endHours":14.126262614740188,"planetary_lord":"Jupiter"},{"name":"Hora 10","start":"14:08","end":"15:08","startHours":14.126262614740188,"endHours":15.126262614740188,"planetary_lord":"Saturn"},{"name":"Hora 11","start":"15:08","end":"16:08","startHours":15.126262614740188,"endHours":16.126262614740188,"planetary_lord":"Moon"},{"name":"Hora 12","start":"16:08","end":"17:08","startHours":16.126262614740188,"endHours":17.126262614740188,"planetary_lord":"Mercury"},{"name":"Hora 13","start":"17:08","end":"18:08","startHours":17.126262614740188,"endHours":18.126262614740188,"planetary_lord":"Venus"},{"name":"Hora 14","start":"18:08","end":"19:08","startHours":18.126262614740188,"endHours":19.126262614740188,"planetary_lord":"Sun"},{"name":"Hora 15","start":"19:08","end":"20:08","startHours":19.126262614740188,"endHours":20.126262614740188,"planetary_lord":"Mars"},{"name":"Hora 16","start":"20:08","end":"21:08","startHours":20.126262614740188,"endHours":21.126262614740188,"planetary_lord":"Jupiter"},{"name":"Hora 17","start":"21:08","end":"22:08","startHours":21.126262614740188,"endHours":22.126262614740188,"planetary_lord":"Saturn"},{"name":"Hora 18","start":"22:08","end":"23:08","startHours":22.126262614740188,"endHours":23.126262614740188,"planetary_lord":"Moon"},{"name":"Hora 19","start":"23:08","end":"00:08","startHours":23.126262614740188,"endHours":24.126262614740188,"planetary_lord":"Mercury"},{"name":"Hora 20","start":"00:08","end":"01:08","startHours":24.126262614740188,"endHours":25.126262614740188,"planetary_lord":"Venus"},{"name":"Hora 21","start":"01:08","end":"02:08","startHours":25.126262614740188,"endHours":26.126262614740188,"planetary_lord":"Sun"},{"name":"Hora 22","start":"02:08","end":"03:08","startHours":26.126262614740188,"endHours":27.126262614740188,"planetary_lord":"Mars"},{"name":"Hora 23","start":"03:08","end":"04:08","startHours":27.126262614740188,"endHours":28.126262614740188,"planetary_lord":"Jupiter"},{"name":"Hora 24","start":"04:08","end":"05:08","startHours":28.126262614740188,"endHours":29.126262614740188,"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","Mithuna","Siṃha","Vṛścika","Dhanu","Mīna"],"unfavorable_rashis":["Vṛṣabha","Karka","Kanyā","Tulā","Makara","Kumbha"]},"dishaShool":"North (Uttara)","chandraVasa":"South","rahuVasa":"North","anandadiYoga":{"name":"Mānasa","quality":"Auspicious"},"tropicalRitu":"Hemanta (Pre-winter)","vedicRitu":"Hemanta (Pre-winter)","tropicalAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-23.41423446461783,"eotMinutes":1.851917522468745,"ayanamsa":23.629}},"calendars":{"vikram_samvat":2040,"vikram_samvatsara":"Dhātṛ","saka_samvat":1905,"saka_samvatsara":"Rudhirodgāri","bengali_samvat":1390,"malayalam_era":1159,"nanakshahi_year":514,"lunar_month":"Mārgaśīrṣa","lunar_month_paksha_full":"Mārgaśīrṣa Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Mārgaśīrṣa","lunar_month_amanta":"Mārgaśīrṣa","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Dhanus (Mārgaḻi)","ritu":"Hemanta (Pre-winter)","display_summary":"Mārgaśīrṣa Śukla Pūrṇimā · Vikram 2040 Dhātṛ · Śaka 1905 Rudhirodgāri"},"festivals":[{"id":"datta-jayanti","name":"Datta Jayantī","name_sanskrit":"दत्त जयन्ती","tradition":"Pan-Hindu","associated_deity":"Dattātreya (Brahmā + Viṣṇu + Śiva combined)","significance":"Birth of Dattātreya from Atri-Anusūyā; tri-mūrti unified avatāra.","vrata":true,"detection":{"tithi_number":15,"tithi_paksha":"Śukla","lunar_month":"Mārgaśīrṣa"},"precedence":2,"sources":["Mārkaṇḍeya Purāṇa","Bhāgavata 4.1.15"]},{"id":"annapurna-jayanti","name":"Annapūrṇā Jayantī","name_sanskrit":"अन्नपूर्णा जयन्ती","tradition":"Shakta","associated_deity":"Devī Annapūrṇā (Pārvatī as nourishing mother)","significance":"Devī Annapūrṇā's manifestation; food-grain pūjā; Mārgaśīrṣa Pūrṇimā tradition.","vrata":true,"detection":{"tithi_number":15,"tithi_paksha":"Śukla","lunar_month":"Mārgaśīrṣa"},"precedence":3,"sources":["Annapūrṇā-stotra by Śaṅkarācārya"]}],"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":"-3137-10-04","event":"Mahābhārata Day 1 (Bhagavad Gītā delivered)","chart_id":"krishna","shared_marker":"same Śukla Pūrṇimā","url":"/day/-3137-10-04","relevance":0.5},{"historical_date":"-0562-04-11","event":"Bhagavān Buddha's birth at Lumbinī","chart_id":"buddha","shared_marker":"same Śukla Pūrṇimā","url":"/day/-0562-04-11","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 December 20, 1983 CE · Perth, Australia · Vidhyamitra","description":"December 20, 1983 CE for Perth, Australia: Śukla Pūrṇimā, sūryodaya 05:08, sūryāsta 19:22.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1983-12-20","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1983-12-20","sa":"https://sa.vidhyamitra.com/city/perth/1983-12-20","hi":"https://hi.vidhyamitra.com/city/perth/1983-12-20","x-default":"https://vidhyamitra.com/city/perth/1983-12-20"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-01T21:41:17.811Z","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":"2026-06-01T21:41:17.811Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-01T21:41:17.811Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}