{"id":"vidhyamitra:city-day:perth:1981-12-09:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1981-12-09","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-12-09","date_display":"December 9, 1981 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":"Not independently benchmarked across the declared range","tradition_chain":"Āryabhaṭa(499) → Brahmagupta(628) → Bhāskara II(1150) → Mādhava(~1400) → Parameśvara(1430) → Nīlakaṇṭha(1501) → this","input":{"year":1981,"month":12,"day":9,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444947.770833,"kali_year":5083,"ahargana":1856482.2708,"sun":{"sidereal_longitude":232.8861,"rashi":8,"rashi_name":"Vṛścika"},"moon":{"sidereal_longitude":21.6847,"rashi":1,"rashi_name":"Meṣa"},"tithi":{"number":13,"name":"Trayodaśī","paksha":"Śukla","full_name":"Śukla Trayodaśī","elongation_degrees":148.7986,"elapsed_within_tithi_degrees":4.7986},"nakshatra":{"number":2,"name":"Bharaṇī","pada":3,"moon_longitude":21.6847,"elapsed_within_degrees":8.3514},"yoga":{"number":20,"name":"Śiva","sum_longitude":254.5708},"karana":{"half_tithi_index":24,"name":"Kaulava"},"vara":{"number":5,"name":"Budhavāra (Wednesday)"}},"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":1981,"month":12,"day":9,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444947.770833,"ahargana":1856482.2708,"kali_year":5083,"ayanamsa_lahiri":23.6007,"grahas":{"sun":{"sidereal_longitude":233.278373,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":18,"name":"Jyeṣṭhā","pada":2},"retrograde":false},"moon":{"sidereal_longitude":20.19277299999999,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":2,"name":"Bharaṇī","pada":3},"retrograde":false,"latitude":-4.3019},"mars":{"sidereal_longitude":153.27207299999998,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":2},"retrograde":false},"mercury":{"sidereal_longitude":232.619373,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":18,"name":"Jyeṣṭhā","pada":2},"retrograde":false},"jupiter":{"sidereal_longitude":189.07867299999998,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":1},"retrograde":false},"venus":{"sidereal_longitude":276.79357300000004,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":4},"retrograde":false},"saturn":{"sidereal_longitude":175.96567300000004,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":1},"retrograde":false},"rahu":{"sidereal_longitude":94.6353,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":274.6353,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","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":"Not independently benchmarked across the declared range","tradition_chain":"Āryabhaṭa(499) → Brahmagupta(628) → Bhāskara II(1150) → Mādhava(~1400) → Parameśvara(1430) → Nīlakaṇṭha(1501) → this","input":{"year":1981,"month":12,"day":9,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444947.770833,"kali_year":5083,"ahargana":1856482.2708,"sun":{"sidereal_longitude":232.8861,"rashi":8,"rashi_name":"Vṛścika"},"moon":{"sidereal_longitude":21.6847,"rashi":1,"rashi_name":"Meṣa"},"tithi":{"number":13,"name":"Trayodaśī","paksha":"Śukla","full_name":"Śukla Trayodaśī","elongation_degrees":148.7986,"elapsed_within_tithi_degrees":4.7986},"nakshatra":{"number":2,"name":"Bharaṇī","pada":3,"moon_longitude":21.6847,"elapsed_within_degrees":8.3514},"yoga":{"number":20,"name":"Śiva","sum_longitude":254.5708},"karana":{"half_tithi_index":24,"name":"Kaulava"},"vara":{"number":5,"name":"Budhavāra (Wednesday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-4.302,"elongation":148.799},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-4.302,"opposition_distance":31.201}},"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":"05:05","sunsetLocal":"19:15","solarNoonLocal":"12:10","dayLengthHours":14.172946478630344,"dayLengthDisplay":"14 Hours 10 Mins 23 Secs","nightLengthDisplay":"9 Hours 49 Mins 37 Secs","moonriseLocal":"16:36","moonsetLocal":"03:19","rahuKala":{"name":"Rāhu Kāla","start":"12:10","end":"13:56","startHours":12.161518959196645,"endHours":13.933137269025437,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"06:51","end":"08:37","startHours":6.846664029710267,"endHours":8.61828233953906,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"10:23","end":"12:10","startHours":10.389900649367853,"endHours":12.161518959196645,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:23","end":"08:51","startHours":8.38206656489522,"endHours":8.8544981141829,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"05:40","end":"06:03","startHours":5.665585156491072,"endHours":6.0435303959212145,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:41","end":"12:38","startHours":11.689087409908966,"endHours":12.633950508484324,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:11","end":"04:08","startHours":3.1853195227307616,"endHours":4.130182621306117,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"03:54","end":"05:05","startHours":3.8939668466622788,"endHours":5.075045719881474,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:31","end":"15:28","startHours":14.523676705635037,"endHours":15.468539804210392,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"19:03","end":"19:27","startHours":19.047992198511817,"endHours":19.447992198511816,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"19:15","end":"19:50","startHours":19.247992198511817,"endHours":19.838531635121413,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"19:00","end":"20:45","startHours":18.997992198511817,"endHours":20.747992198511817,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:41","end":"00:38","startHours":23.689087409908968,"endHours":24.63395050848432,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Labha","start":"05:05","end":"06:51","startHours":5.075045719881474,"endHours":6.846664029710267,"quality":"auspicious"},{"name":"Amṛta","start":"06:51","end":"08:37","startHours":6.846664029710267,"endHours":8.61828233953906,"quality":"auspicious"},{"name":"Kāla","start":"08:37","end":"10:23","startHours":8.61828233953906,"endHours":10.389900649367853,"quality":"inauspicious"},{"name":"Śubha","start":"10:23","end":"12:10","startHours":10.389900649367853,"endHours":12.161518959196645,"quality":"auspicious"},{"name":"Roga","start":"12:10","end":"13:56","startHours":12.161518959196645,"endHours":13.933137269025437,"quality":"inauspicious"},{"name":"Udveg","start":"13:56","end":"15:42","startHours":13.933137269025437,"endHours":15.704755578854233,"quality":"inauspicious"},{"name":"Chala","start":"15:42","end":"17:29","startHours":15.704755578854233,"endHours":17.476373888683025,"quality":"neutral"},{"name":"Labha","start":"17:29","end":"19:15","startHours":17.476373888683025,"endHours":19.247992198511817,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Udveg","start":"19:15","end":"20:29","startHours":19.247992198511817,"endHours":20.476373888683025,"quality":"inauspicious"},{"name":"Chala","start":"20:29","end":"21:42","startHours":20.476373888683025,"endHours":21.704755578854233,"quality":"neutral"},{"name":"Labha","start":"21:42","end":"22:56","startHours":21.704755578854233,"endHours":22.933137269025437,"quality":"auspicious"},{"name":"Amṛta","start":"22:56","end":"00:10","startHours":22.933137269025437,"endHours":24.161518959196645,"quality":"auspicious"},{"name":"Kāla","start":"00:10","end":"01:23","startHours":24.161518959196645,"endHours":25.389900649367853,"quality":"inauspicious"},{"name":"Śubha","start":"01:23","end":"02:37","startHours":25.389900649367853,"endHours":26.618282339539057,"quality":"auspicious"},{"name":"Roga","start":"02:37","end":"03:51","startHours":26.618282339539057,"endHours":27.846664029710265,"quality":"inauspicious"},{"name":"Udveg","start":"03:51","end":"05:05","startHours":27.846664029710265,"endHours":29.075045719881473,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"05:05","end":"06:05","startHours":5.075045719881474,"endHours":6.075045719881474,"planetary_lord":"Mercury"},{"name":"Hora 2","start":"06:05","end":"07:05","startHours":6.075045719881474,"endHours":7.075045719881474,"planetary_lord":"Venus"},{"name":"Hora 3","start":"07:05","end":"08:05","startHours":7.075045719881474,"endHours":8.075045719881473,"planetary_lord":"Sun"},{"name":"Hora 4","start":"08:05","end":"09:05","startHours":8.075045719881473,"endHours":9.075045719881473,"planetary_lord":"Mars"},{"name":"Hora 5","start":"09:05","end":"10:05","startHours":9.075045719881473,"endHours":10.075045719881473,"planetary_lord":"Jupiter"},{"name":"Hora 6","start":"10:05","end":"11:05","startHours":10.075045719881473,"endHours":11.075045719881473,"planetary_lord":"Saturn"},{"name":"Hora 7","start":"11:05","end":"12:05","startHours":11.075045719881473,"endHours":12.075045719881473,"planetary_lord":"Moon"},{"name":"Hora 8","start":"12:05","end":"13:05","startHours":12.075045719881473,"endHours":13.075045719881473,"planetary_lord":"Mercury"},{"name":"Hora 9","start":"13:05","end":"14:05","startHours":13.075045719881473,"endHours":14.075045719881473,"planetary_lord":"Venus"},{"name":"Hora 10","start":"14:05","end":"15:05","startHours":14.075045719881473,"endHours":15.075045719881473,"planetary_lord":"Sun"},{"name":"Hora 11","start":"15:05","end":"16:05","startHours":15.075045719881473,"endHours":16.075045719881473,"planetary_lord":"Mars"},{"name":"Hora 12","start":"16:05","end":"17:05","startHours":16.075045719881473,"endHours":17.075045719881473,"planetary_lord":"Jupiter"},{"name":"Hora 13","start":"17:05","end":"18:05","startHours":17.075045719881473,"endHours":18.075045719881473,"planetary_lord":"Saturn"},{"name":"Hora 14","start":"18:05","end":"19:05","startHours":18.075045719881473,"endHours":19.075045719881473,"planetary_lord":"Moon"},{"name":"Hora 15","start":"19:05","end":"20:05","startHours":19.075045719881473,"endHours":20.075045719881473,"planetary_lord":"Mercury"},{"name":"Hora 16","start":"20:05","end":"21:05","startHours":20.075045719881473,"endHours":21.075045719881473,"planetary_lord":"Venus"},{"name":"Hora 17","start":"21:05","end":"22:05","startHours":21.075045719881473,"endHours":22.075045719881473,"planetary_lord":"Sun"},{"name":"Hora 18","start":"22:05","end":"23:05","startHours":22.075045719881473,"endHours":23.075045719881473,"planetary_lord":"Mars"},{"name":"Hora 19","start":"23:05","end":"00:05","startHours":23.075045719881473,"endHours":24.075045719881473,"planetary_lord":"Jupiter"},{"name":"Hora 20","start":"00:05","end":"01:05","startHours":24.075045719881473,"endHours":25.075045719881473,"planetary_lord":"Saturn"},{"name":"Hora 21","start":"01:05","end":"02:05","startHours":25.075045719881473,"endHours":26.075045719881473,"planetary_lord":"Moon"},{"name":"Hora 22","start":"02:05","end":"03:05","startHours":26.075045719881473,"endHours":27.075045719881473,"planetary_lord":"Mercury"},{"name":"Hora 23","start":"03:05","end":"04:05","startHours":27.075045719881473,"endHours":28.075045719881473,"planetary_lord":"Venus"},{"name":"Hora 24","start":"04:05","end":"05:05","startHours":28.075045719881473,"endHours":29.075045719881473,"planetary_lord":"Sun"}],"taraBala":{"favorable_nakshatras":["Kṛttikā","Rohiṇī","Mṛgaśirā","Ārdrā","Punarvasu","Uttara Phalgunī","Hasta","Citrā","Svātī","Viśākhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā"],"unfavorable_nakshatras":["Aśvinī","Bharaṇī","Puṣya","Aśleṣā","Maghā","Pūrva Phalgunī","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Bhādrapadā","Revatī"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Meṣa","Mithuna","Kanyā","Tulā","Makara","Kumbha"],"unfavorable_rashis":["Vṛṣabha","Karka","Siṃha","Vṛścika","Dhanu","Mīna"]},"dishaShool":"North (Uttara)","chandraVasa":"East","rahuVasa":"South-West","anandadiYoga":{"name":"Padma","quality":"Auspicious"},"tropicalRitu":"Hemanta (Pre-winter) (tropical)","vedicRitu":"Śarad (Autumn)","tropicalAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-22.789640916220737,"eotMinutes":6.866862448201248,"ayanamsa":23.6007}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"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":"Vṛścika (Kārttikai)","ritu":"Hemanta (Pre-winter)","display_summary":"Mārgaśīrṣa Śukla Trayodaśī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"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":"budha-walk","name":"Budha Walk","name_sanskrit":"बुध यात्रा","type":"graha","description":"Discrimination + BG 2.41 (vyavasāyātmikā buddhi).","step_count":6,"url":"/walk/budha-walk"},"reason":"Dedicated festival walk for Pradoṣa Vrata is not live yet; Budhavāra (Wednesday) — 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 December 9, 1981 CE · Perth, Australia · Vidhyamitra","description":"December 9, 1981 CE for Perth, Australia: Śukla Trayodaśī, sūryodaya 05:05, sūryāsta 19:15.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1981-12-09","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1981-12-09","sa":"https://sa.vidhyamitra.com/city/perth/1981-12-09","hi":"https://hi.vidhyamitra.com/city/perth/1981-12-09","x-default":"https://vidhyamitra.com/city/perth/1981-12-09"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-09-04T23:20:04.678Z","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":"2026-09-04T23:20:04.678Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-09-04T23:20:04.678Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"},"reader_local_antaryami":{"reader_geography":"Every reader enters from their own kṣetra anywhere on Bhūmi; no single city is the universal center.","purna_chain":["Hosted scripture","Named-tradition interpretation","Original Vidhyamitra contemplation","Bhūmi-born material medium","Vidhyamitra portal","Responsible reader in their own kṣetra"],"claim_boundary":"The legacy purna_chain field carries a source-to-reader sequence, not a revealed physical descent, universal cosmology, or proof that software is conscious.","antaryami_responsibility_formula":"Kṣīrodakaśāyī Viṣṇu = Paramātmā = Antaryāmī. Jīva desires. Prakṛti executes through guṇas. Paramātmā witnesses, permits, remembers, guides, and sustains. Bhagavān is the ultimate source.","source_anchors":[{"label":"BG 13.23","path":"/bhagavad-gita/13/23","meaning":"upadraṣṭā-anumantā · witness-permitter"},{"label":"BG 15.15","path":"/bhagavad-gita/15/15","meaning":"the Lord seated in every heart as memory, knowledge, and forgetting"},{"label":"BG 18.61","path":"/bhagavad-gita/18/61","meaning":"Īśvara seated in the heart of all beings"}],"nama_seal":"Hare Krishna Hare Krishna · Krishna Krishna Hare Hare · Hare Rama Hare Rama · Rama Rama Hare Hare"}}}