{"id":"vidhyamitra:city-day:perth:1971-10-01:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1971-10-01","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1971-10-01","date_display":"October 1, 1971 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":1971,"month":10,"day":1,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2441225.770833,"kali_year":5073,"ahargana":1852760.2708,"sun":{"sidereal_longitude":163.0768,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":297.1493,"rashi":10,"rashi_name":"Makara"},"tithi":{"number":12,"name":"Dvādaśī","paksha":"Śukla","full_name":"Śukla Dvādaśī","elongation_degrees":134.0725,"elapsed_within_tithi_degrees":2.0725},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":2,"moon_longitude":297.1493,"elapsed_within_degrees":3.8159},"yoga":{"number":8,"name":"Dhṛti","sum_longitude":100.2261},"karana":{"half_tithi_index":22,"name":"Bava"},"vara":{"number":0,"name":"Śukravāra (Friday)"}},"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":1971,"month":10,"day":1,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2441225.770833,"ahargana":1852760.2708,"kali_year":5073,"ayanamsa_lahiri":23.4583,"grahas":{"sun":{"sidereal_longitude":163.75388099999998,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":false},"moon":{"sidereal_longitude":295.321181,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":1},"retrograde":false,"latitude":0.4156},"mars":{"sidereal_longitude":291.79208100000005,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":158.10308099999997,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":220.22518100000002,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","pada":3},"retrograde":false},"venus":{"sidereal_longitude":173.383781,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":1},"retrograde":false},"saturn":{"sidereal_longitude":43.317881,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":291.8447,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":111.8447,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","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":1971,"month":10,"day":1,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2441225.770833,"kali_year":5073,"ahargana":1852760.2708,"sun":{"sidereal_longitude":163.0768,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":297.1493,"rashi":10,"rashi_name":"Makara"},"tithi":{"number":12,"name":"Dvādaśī","paksha":"Śukla","full_name":"Śukla Dvādaśī","elongation_degrees":134.0725,"elapsed_within_tithi_degrees":2.0725},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":2,"moon_longitude":297.1493,"elapsed_within_degrees":3.8159},"yoga":{"number":8,"name":"Dhṛti","sum_longitude":100.2261},"karana":{"half_tithi_index":22,"name":"Bava"},"vara":{"number":0,"name":"Śukravāra (Friday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":0.416,"elongation":134.072},"lunar":{"type":"lunar","occurs":false,"moon_latitude":0.416,"opposition_distance":45.928}},"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":"05:54","sunsetLocal":"18:16","solarNoonLocal":"12:05","dayLengthHours":12.369401360820909,"dayLengthDisplay":"12 Hours 22 Mins 10 Secs","nightLengthDisplay":"11 Hours 37 Mins 50 Secs","moonriseLocal":"14:10","moonsetLocal":"03:34","rahuKala":{"name":"Rāhu Kāla","start":"10:33","end":"12:05","startHours":10.543662093454314,"endHours":12.089837263556927,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"15:11","end":"16:44","startHours":15.182187603762156,"endHours":16.728362773864767,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"07:27","end":"09:00","startHours":7.451311753249087,"endHours":8.997486923351701,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:47","end":"09:12","startHours":8.791330234004686,"endHours":9.203643612698716,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:25","end":"06:45","startHours":6.420528306514011,"endHours":6.750379009469235,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:41","end":"12:30","startHours":11.677523884862897,"endHours":12.502150642250957,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:15","end":"05:05","startHours":4.255883068370352,"endHours":5.080509825758412,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:52","end":"05:54","startHours":4.874353136411397,"endHours":5.905136583146473,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:09","end":"14:59","startHours":14.151404157027077,"endHours":14.976030914415137,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:04","end":"18:28","startHours":18.074537943967382,"endHours":18.47453794396738,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:16","end":"18:47","startHours":18.27453794396738,"endHours":18.78992966733492,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:01","end":"19:46","startHours":18.02453794396738,"endHours":19.77453794396738,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:41","end":"00:30","startHours":23.677523884862897,"endHours":24.502150642250957,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Chala","start":"05:54","end":"07:27","startHours":5.905136583146473,"endHours":7.451311753249087,"quality":"neutral"},{"name":"Labha","start":"07:27","end":"09:00","startHours":7.451311753249087,"endHours":8.997486923351701,"quality":"auspicious"},{"name":"Amṛta","start":"09:00","end":"10:33","startHours":8.997486923351701,"endHours":10.543662093454314,"quality":"auspicious"},{"name":"Kāla","start":"10:33","end":"12:05","startHours":10.543662093454314,"endHours":12.089837263556927,"quality":"inauspicious"},{"name":"Śubha","start":"12:05","end":"13:38","startHours":12.089837263556927,"endHours":13.636012433659541,"quality":"auspicious"},{"name":"Roga","start":"13:38","end":"15:11","startHours":13.636012433659541,"endHours":15.182187603762156,"quality":"inauspicious"},{"name":"Udveg","start":"15:11","end":"16:44","startHours":15.182187603762156,"endHours":16.728362773864767,"quality":"inauspicious"},{"name":"Chala","start":"16:44","end":"18:16","startHours":16.728362773864767,"endHours":18.27453794396738,"quality":"neutral"}],"nightChoghadiyas":[{"name":"Roga","start":"18:16","end":"19:44","startHours":18.27453794396738,"endHours":19.728362773864767,"quality":"inauspicious"},{"name":"Udveg","start":"19:44","end":"21:11","startHours":19.728362773864767,"endHours":21.182187603762152,"quality":"inauspicious"},{"name":"Chala","start":"21:11","end":"22:38","startHours":21.182187603762152,"endHours":22.63601243365954,"quality":"neutral"},{"name":"Labha","start":"22:38","end":"00:05","startHours":22.63601243365954,"endHours":24.089837263556927,"quality":"auspicious"},{"name":"Amṛta","start":"00:05","end":"01:33","startHours":24.089837263556927,"endHours":25.543662093454312,"quality":"auspicious"},{"name":"Kāla","start":"01:33","end":"03:00","startHours":25.543662093454312,"endHours":26.9974869233517,"quality":"inauspicious"},{"name":"Śubha","start":"03:00","end":"04:27","startHours":26.9974869233517,"endHours":28.451311753249087,"quality":"auspicious"},{"name":"Roga","start":"04:27","end":"05:54","startHours":28.451311753249087,"endHours":29.905136583146472,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"05:54","end":"06:54","startHours":5.905136583146473,"endHours":6.905136583146473,"planetary_lord":"Venus"},{"name":"Hora 2","start":"06:54","end":"07:54","startHours":6.905136583146473,"endHours":7.905136583146473,"planetary_lord":"Sun"},{"name":"Hora 3","start":"07:54","end":"08:54","startHours":7.905136583146473,"endHours":8.905136583146472,"planetary_lord":"Mars"},{"name":"Hora 4","start":"08:54","end":"09:54","startHours":8.905136583146472,"endHours":9.905136583146472,"planetary_lord":"Jupiter"},{"name":"Hora 5","start":"09:54","end":"10:54","startHours":9.905136583146472,"endHours":10.905136583146472,"planetary_lord":"Saturn"},{"name":"Hora 6","start":"10:54","end":"11:54","startHours":10.905136583146472,"endHours":11.905136583146472,"planetary_lord":"Moon"},{"name":"Hora 7","start":"11:54","end":"12:54","startHours":11.905136583146472,"endHours":12.905136583146472,"planetary_lord":"Mercury"},{"name":"Hora 8","start":"12:54","end":"13:54","startHours":12.905136583146472,"endHours":13.905136583146472,"planetary_lord":"Venus"},{"name":"Hora 9","start":"13:54","end":"14:54","startHours":13.905136583146472,"endHours":14.905136583146472,"planetary_lord":"Sun"},{"name":"Hora 10","start":"14:54","end":"15:54","startHours":14.905136583146472,"endHours":15.905136583146472,"planetary_lord":"Mars"},{"name":"Hora 11","start":"15:54","end":"16:54","startHours":15.905136583146472,"endHours":16.905136583146472,"planetary_lord":"Jupiter"},{"name":"Hora 12","start":"16:54","end":"17:54","startHours":16.905136583146472,"endHours":17.905136583146472,"planetary_lord":"Saturn"},{"name":"Hora 13","start":"17:54","end":"18:54","startHours":17.905136583146472,"endHours":18.905136583146472,"planetary_lord":"Moon"},{"name":"Hora 14","start":"18:54","end":"19:54","startHours":18.905136583146472,"endHours":19.905136583146472,"planetary_lord":"Mercury"},{"name":"Hora 15","start":"19:54","end":"20:54","startHours":19.905136583146472,"endHours":20.905136583146472,"planetary_lord":"Venus"},{"name":"Hora 16","start":"20:54","end":"21:54","startHours":20.905136583146472,"endHours":21.905136583146472,"planetary_lord":"Sun"},{"name":"Hora 17","start":"21:54","end":"22:54","startHours":21.905136583146472,"endHours":22.905136583146472,"planetary_lord":"Mars"},{"name":"Hora 18","start":"22:54","end":"23:54","startHours":22.905136583146472,"endHours":23.905136583146472,"planetary_lord":"Jupiter"},{"name":"Hora 19","start":"23:54","end":"00:54","startHours":23.905136583146472,"endHours":24.905136583146472,"planetary_lord":"Saturn"},{"name":"Hora 20","start":"00:54","end":"01:54","startHours":24.905136583146472,"endHours":25.905136583146472,"planetary_lord":"Moon"},{"name":"Hora 21","start":"01:54","end":"02:54","startHours":25.905136583146472,"endHours":26.905136583146472,"planetary_lord":"Mercury"},{"name":"Hora 22","start":"02:54","end":"03:54","startHours":26.905136583146472,"endHours":27.905136583146472,"planetary_lord":"Venus"},{"name":"Hora 23","start":"03:54","end":"04:54","startHours":27.905136583146472,"endHours":28.905136583146472,"planetary_lord":"Sun"},{"name":"Hora 24","start":"04:54","end":"05:54","startHours":28.905136583146472,"endHours":29.905136583146472,"planetary_lord":"Mars"}],"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":["Mithuna","Karka","Tulā","Vṛścika","Makara","Mīna"],"unfavorable_rashis":["Meṣa","Vṛṣabha","Siṃha","Kanyā","Dhanu","Kumbha"]},"dishaShool":"West (Paścim)","chandraVasa":"South-East","rahuVasa":"South-East","anandadiYoga":{"name":"Lumba","quality":"Auspicious"},"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":-2.8621394986911426,"eotMinutes":11.167764186584405,"ayanamsa":23.4583}},"calendars":{"vikram_samvat":2028,"vikram_samvatsara":"Raktākṣī","saka_samvat":1893,"saka_samvatsara":"Virodhakṛt","bengali_samvat":1378,"malayalam_era":1147,"nanakshahi_year":502,"lunar_month":"Āśvina","lunar_month_paksha_full":"Āśvina Śukla Pakṣa","solar_month":"Kanyā (Puraṭṭāsi)","ritu":"Śarad (Autumn)","display_summary":"Āśvina Śukla Dvādaśī · Vikram 2028 Raktākṣī · Śaka 1893 Virodhakṛt"},"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":"shukra-walk","name":"Śukra Walk","name_sanskrit":"शुक्र यात्रा","type":"graha","description":"Beauty + creativity in dharma + BG 10.36.","step_count":5,"url":"/walk/shukra-walk"},"reason":"Śukravāra (Friday) — 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 1, 1971 CE · Perth, Australia · Vidhyamitra","description":"October 1, 1971 CE for Perth, Australia: Śukla Dvādaśī, sūryodaya 05:54, sūryāsta 18:16.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1971-10-01","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1971-10-01","sa":"https://sa.vidhyamitra.com/city/perth/1971-10-01","hi":"https://hi.vidhyamitra.com/city/perth/1971-10-01","x-default":"https://vidhyamitra.com/city/perth/1971-10-01"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-20T01:07:23.951Z","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":"2026-05-20T01:07:23.951Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-20T01:07:23.951Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}