{"id":"vidhyamitra:city-day:perth:1981-10-12:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1981-10-12","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-10-12","date_display":"October 12, 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":"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":1981,"month":10,"day":12,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444889.770833,"kali_year":5083,"ahargana":1856424.2708,"sun":{"sidereal_longitude":174.3388,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":333.8344,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":14,"name":"Caturdaśī","paksha":"Śukla","full_name":"Śukla Caturdaśī","elongation_degrees":159.4956,"elapsed_within_tithi_degrees":3.4956},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":1,"moon_longitude":333.8344,"elapsed_within_degrees":0.5011},"yoga":{"number":12,"name":"Dhruva","sum_longitude":148.1732},"karana":{"half_tithi_index":26,"name":"Gara"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"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":10,"day":12,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444889.770833,"ahargana":1856424.2708,"kali_year":5083,"ayanamsa_lahiri":23.5985,"grahas":{"sun":{"sidereal_longitude":175.033589,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":1},"retrograde":false},"moon":{"sidereal_longitude":334.638189,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":1},"retrograde":false,"latitude":-3.735},"mars":{"sidereal_longitude":121.314889,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":1},"retrograde":false},"mercury":{"sidereal_longitude":188.73588900000004,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":1},"retrograde":true},"jupiter":{"sidereal_longitude":177.045389,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":2},"retrograde":false},"venus":{"sidereal_longitude":220.12308899999994,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":169.64748899999995,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":3},"retrograde":false},"rahu":{"sidereal_longitude":97.7084,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":277.7084,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":4},"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":1981,"month":10,"day":12,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444889.770833,"kali_year":5083,"ahargana":1856424.2708,"sun":{"sidereal_longitude":174.3388,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":333.8344,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":14,"name":"Caturdaśī","paksha":"Śukla","full_name":"Śukla Caturdaśī","elongation_degrees":159.4956,"elapsed_within_tithi_degrees":3.4956},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":1,"moon_longitude":333.8344,"elapsed_within_degrees":0.5011},"yoga":{"number":12,"name":"Dhruva","sum_longitude":148.1732},"karana":{"half_tithi_index":26,"name":"Gara"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-3.735,"elongation":159.496},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-3.735,"opposition_distance":20.504}},"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":"05:40","sunsetLocal":"18:25","solarNoonLocal":"12:02","dayLengthHours":12.743512877892673,"dayLengthDisplay":"12 Hours 44 Mins 37 Secs","nightLengthDisplay":"11 Hours 15 Mins 23 Secs","moonriseLocal":"16:36","moonsetLocal":"04:45","rahuKala":{"name":"Rāhu Kāla","start":"07:16","end":"08:51","startHours":7.26015822263725,"endHours":8.853097332373833,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"10:27","end":"12:02","startHours":10.446036442110419,"endHours":12.038975551847003,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"13:38","end":"15:13","startHours":13.631914661583586,"endHours":15.22485377132017,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:38","end":"09:04","startHours":8.640705451075622,"endHours":9.065489213672045,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:12","end":"06:32","startHours":6.198198816146193,"endHours":6.538025826223331,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:37","end":"12:28","startHours":11.614191789250578,"endHours":12.463759314443424,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:58","end":"04:49","startHours":3.9680840625149756,"endHours":4.81765158770782,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:36","end":"05:40","startHours":4.605259706409609,"endHours":5.667219112900665,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:10","end":"15:01","startHours":14.162894364829114,"endHours":15.012461890021958,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:13","end":"18:37","startHours":18.210731990793338,"endHours":18.610731990793337,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:25","end":"18:57","startHours":18.410731990793337,"endHours":18.941711694038865,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:10","end":"19:55","startHours":18.160731990793337,"endHours":19.910731990793337,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:37","end":"00:28","startHours":23.61419178925058,"endHours":24.463759314443426,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Amṛta","start":"05:40","end":"07:16","startHours":5.667219112900665,"endHours":7.26015822263725,"quality":"auspicious"},{"name":"Kāla","start":"07:16","end":"08:51","startHours":7.26015822263725,"endHours":8.853097332373833,"quality":"inauspicious"},{"name":"Śubha","start":"08:51","end":"10:27","startHours":8.853097332373833,"endHours":10.446036442110419,"quality":"auspicious"},{"name":"Roga","start":"10:27","end":"12:02","startHours":10.446036442110419,"endHours":12.038975551847003,"quality":"inauspicious"},{"name":"Udveg","start":"12:02","end":"13:38","startHours":12.038975551847003,"endHours":13.631914661583586,"quality":"inauspicious"},{"name":"Chala","start":"13:38","end":"15:13","startHours":13.631914661583586,"endHours":15.22485377132017,"quality":"neutral"},{"name":"Labha","start":"15:13","end":"16:49","startHours":15.22485377132017,"endHours":16.817792881056754,"quality":"auspicious"},{"name":"Amṛta","start":"16:49","end":"18:25","startHours":16.817792881056754,"endHours":18.410731990793337,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Chala","start":"18:25","end":"19:49","startHours":18.410731990793337,"endHours":19.817792881056754,"quality":"neutral"},{"name":"Labha","start":"19:49","end":"21:13","startHours":19.817792881056754,"endHours":21.22485377132017,"quality":"auspicious"},{"name":"Amṛta","start":"21:13","end":"22:38","startHours":21.22485377132017,"endHours":22.631914661583586,"quality":"auspicious"},{"name":"Kāla","start":"22:38","end":"00:02","startHours":22.631914661583586,"endHours":24.038975551847003,"quality":"inauspicious"},{"name":"Śubha","start":"00:02","end":"01:27","startHours":24.038975551847003,"endHours":25.44603644211042,"quality":"auspicious"},{"name":"Roga","start":"01:27","end":"02:51","startHours":25.44603644211042,"endHours":26.85309733237383,"quality":"inauspicious"},{"name":"Udveg","start":"02:51","end":"04:16","startHours":26.85309733237383,"endHours":28.260158222637248,"quality":"inauspicious"},{"name":"Chala","start":"04:16","end":"05:40","startHours":28.260158222637248,"endHours":29.667219112900664,"quality":"neutral"}],"horas":[{"name":"Hora 1","start":"05:40","end":"06:40","startHours":5.667219112900665,"endHours":6.667219112900665,"planetary_lord":"Moon"},{"name":"Hora 2","start":"06:40","end":"07:40","startHours":6.667219112900665,"endHours":7.667219112900665,"planetary_lord":"Mercury"},{"name":"Hora 3","start":"07:40","end":"08:40","startHours":7.667219112900665,"endHours":8.667219112900664,"planetary_lord":"Venus"},{"name":"Hora 4","start":"08:40","end":"09:40","startHours":8.667219112900664,"endHours":9.667219112900664,"planetary_lord":"Sun"},{"name":"Hora 5","start":"09:40","end":"10:40","startHours":9.667219112900664,"endHours":10.667219112900664,"planetary_lord":"Mars"},{"name":"Hora 6","start":"10:40","end":"11:40","startHours":10.667219112900664,"endHours":11.667219112900664,"planetary_lord":"Jupiter"},{"name":"Hora 7","start":"11:40","end":"12:40","startHours":11.667219112900664,"endHours":12.667219112900664,"planetary_lord":"Saturn"},{"name":"Hora 8","start":"12:40","end":"13:40","startHours":12.667219112900664,"endHours":13.667219112900664,"planetary_lord":"Moon"},{"name":"Hora 9","start":"13:40","end":"14:40","startHours":13.667219112900664,"endHours":14.667219112900664,"planetary_lord":"Mercury"},{"name":"Hora 10","start":"14:40","end":"15:40","startHours":14.667219112900664,"endHours":15.667219112900664,"planetary_lord":"Venus"},{"name":"Hora 11","start":"15:40","end":"16:40","startHours":15.667219112900664,"endHours":16.667219112900664,"planetary_lord":"Sun"},{"name":"Hora 12","start":"16:40","end":"17:40","startHours":16.667219112900664,"endHours":17.667219112900664,"planetary_lord":"Mars"},{"name":"Hora 13","start":"17:40","end":"18:40","startHours":17.667219112900664,"endHours":18.667219112900664,"planetary_lord":"Jupiter"},{"name":"Hora 14","start":"18:40","end":"19:40","startHours":18.667219112900664,"endHours":19.667219112900664,"planetary_lord":"Saturn"},{"name":"Hora 15","start":"19:40","end":"20:40","startHours":19.667219112900664,"endHours":20.667219112900664,"planetary_lord":"Moon"},{"name":"Hora 16","start":"20:40","end":"21:40","startHours":20.667219112900664,"endHours":21.667219112900664,"planetary_lord":"Mercury"},{"name":"Hora 17","start":"21:40","end":"22:40","startHours":21.667219112900664,"endHours":22.667219112900664,"planetary_lord":"Venus"},{"name":"Hora 18","start":"22:40","end":"23:40","startHours":22.667219112900664,"endHours":23.667219112900664,"planetary_lord":"Sun"},{"name":"Hora 19","start":"23:40","end":"00:40","startHours":23.667219112900664,"endHours":24.667219112900664,"planetary_lord":"Mars"},{"name":"Hora 20","start":"00:40","end":"01:40","startHours":24.667219112900664,"endHours":25.667219112900664,"planetary_lord":"Jupiter"},{"name":"Hora 21","start":"01:40","end":"02:40","startHours":25.667219112900664,"endHours":26.667219112900664,"planetary_lord":"Saturn"},{"name":"Hora 22","start":"02:40","end":"03:40","startHours":26.667219112900664,"endHours":27.667219112900664,"planetary_lord":"Moon"},{"name":"Hora 23","start":"03:40","end":"04:40","startHours":27.667219112900664,"endHours":28.667219112900664,"planetary_lord":"Mercury"},{"name":"Hora 24","start":"04:40","end":"05:40","startHours":28.667219112900664,"endHours":29.667219112900664,"planetary_lord":"Venus"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Rohiṇī","Aśleṣā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Revatī"],"unfavorable_nakshatras":["Mṛgaśirā","Ārdrā","Punarvasu","Puṣya","Citrā","Svātī","Viśākhā","Anurādhā","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Vṛṣabha","Siṃha","Kanyā","Dhanu","Makara","Mīna"],"unfavorable_rashis":["Meṣa","Mithuna","Karka","Tulā","Vṛścika","Kumbha"]},"dishaShool":"East (Pūrva)","chandraVasa":"South-West","rahuVasa":"North-East","anandadiYoga":{"name":"Kāladaṇḍa","quality":"Inauspicious"},"drikRitu":"Śarad (Autumn) (Drik)","vedicRitu":"Varṣā (Monsoon)","drikAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":-7.30040211532689,"eotMinutes":14.219466889179907,"ayanamsa":23.5985}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Āśvina","lunar_month_paksha_full":"Āśvina Śukla Pakṣa","solar_month":"Kanyā (Puraṭṭāsi)","ritu":"Śarad (Autumn)","display_summary":"Āśvina Śukla Caturdaśī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"kanya-sankranti","name":"Kanyā Saṅkrānti (Mahālaya begins)","name_sanskrit":"कन्या सङ्क्रान्ति","tradition":"Pan-Hindu","significance":"Sun enters Virgo; Mahālaya / Pitṛ-Pakṣa solar marker.","vrata":false,"detection":{"sun_rashi":"Kanyā"},"precedence":4}],"todays_walk":{"walk":{"id":"chandra-walk","name":"Candra Walk","name_sanskrit":"चन्द्र यात्रा","type":"graha","description":"Manas-control + BG 6.5-7.","step_count":5,"url":"/walk/chandra-walk"},"reason":"Somavāra (Monday) — 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 October 12, 1981 CE · Perth, Australia · Vidhyamitra","description":"October 12, 1981 CE for Perth, Australia: Śukla Caturdaśī, sūryodaya 05:40, sūryāsta 18:25.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1981-10-12","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1981-10-12","sa":"https://sa.vidhyamitra.com/city/perth/1981-10-12","hi":"https://hi.vidhyamitra.com/city/perth/1981-10-12","x-default":"https://vidhyamitra.com/city/perth/1981-10-12"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-18T10:03:55.350Z","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":"2026-05-18T10:03:55.350Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-18T10:03:55.350Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}