{"id":"vidhyamitra:city-day:perth:1971-10-04:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1971-10-04","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1971-10-04","date_display":"October 4, 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":4,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2441228.770833,"kali_year":5073,"ahargana":1852763.2708,"sun":{"sidereal_longitude":166.0284,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":339.4613,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":15,"name":"Pūrṇimā","paksha":"Śukla","full_name":"Śukla Pūrṇimā","elongation_degrees":173.4329,"elapsed_within_tithi_degrees":5.4329},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":2,"moon_longitude":339.4613,"elapsed_within_degrees":6.1279},"yoga":{"number":11,"name":"Vṛddhi","sum_longitude":145.4897},"karana":{"half_tithi_index":28,"name":"Viṣṭi"},"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":1971,"month":10,"day":4,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2441228.770833,"ahargana":1852763.2708,"kali_year":5073,"ayanamsa_lahiri":23.4584,"grahas":{"sun":{"sidereal_longitude":166.70526599999994,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":3},"retrograde":false},"moon":{"sidereal_longitude":339.919766,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":2},"retrograde":false,"latitude":3.3308},"mars":{"sidereal_longitude":292.638066,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":163.494366,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":false},"jupiter":{"sidereal_longitude":220.73786599999994,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","pada":3},"retrograde":false},"venus":{"sidereal_longitude":177.120766,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":43.245566,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":291.6858,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":111.6858,"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":4,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2441228.770833,"kali_year":5073,"ahargana":1852763.2708,"sun":{"sidereal_longitude":166.0284,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":339.4613,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":15,"name":"Pūrṇimā","paksha":"Śukla","full_name":"Śukla Pūrṇimā","elongation_degrees":173.4329,"elapsed_within_tithi_degrees":5.4329},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":2,"moon_longitude":339.4613,"elapsed_within_degrees":6.1279},"yoga":{"number":11,"name":"Vṛddhi","sum_longitude":145.4897},"karana":{"half_tithi_index":28,"name":"Viṣṭi"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":3.331,"elongation":173.433},"lunar":{"type":"lunar","occurs":false,"moon_latitude":3.331,"opposition_distance":6.567}},"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":"05:50","sunsetLocal":"18:18","solarNoonLocal":"12:04","dayLengthHours":12.466723280587296,"dayLengthDisplay":"12 Hours 28 Mins 00 Secs","nightLengthDisplay":"11 Hours 32 Mins 00 Secs","moonriseLocal":"17:38","moonsetLocal":"05:37","rahuKala":{"name":"Rāhu Kāla","start":"07:24","end":"08:57","startHours":7.3993277166515945,"endHours":8.957668126725007,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"10:31","end":"12:04","startHours":10.516008536798418,"endHours":12.07434894687183,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"13:38","end":"15:11","startHours":13.632689356945242,"endHours":15.191029767018655,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:45","end":"09:10","startHours":8.749889405381886,"endHours":9.165446848068129,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:22","end":"06:42","startHours":6.360434109935986,"endHours":6.692880064084981,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:40","end":"12:29","startHours":11.658791504185587,"endHours":12.489906389558072,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:11","end":"05:01","startHours":4.17875753583321,"endHours":5.009872421205696,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:48","end":"05:50","startHours":4.802093699862574,"endHours":5.8409873065781825,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:09","end":"14:59","startHours":14.152136160303044,"endHours":14.98325104567553,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:06","end":"18:30","startHours":18.107710587165478,"endHours":18.507710587165477,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:18","end":"18:50","startHours":18.307710587165477,"endHours":18.827157390523283,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:03","end":"19:48","startHours":18.057710587165477,"endHours":19.807710587165477,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:40","end":"00:29","startHours":23.658791504185587,"endHours":24.489906389558072,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Amṛta","start":"05:50","end":"07:24","startHours":5.8409873065781825,"endHours":7.3993277166515945,"quality":"auspicious"},{"name":"Kāla","start":"07:24","end":"08:57","startHours":7.3993277166515945,"endHours":8.957668126725007,"quality":"inauspicious"},{"name":"Śubha","start":"08:57","end":"10:31","startHours":8.957668126725007,"endHours":10.516008536798418,"quality":"auspicious"},{"name":"Roga","start":"10:31","end":"12:04","startHours":10.516008536798418,"endHours":12.07434894687183,"quality":"inauspicious"},{"name":"Udveg","start":"12:04","end":"13:38","startHours":12.07434894687183,"endHours":13.632689356945242,"quality":"inauspicious"},{"name":"Chala","start":"13:38","end":"15:11","startHours":13.632689356945242,"endHours":15.191029767018655,"quality":"neutral"},{"name":"Labha","start":"15:11","end":"16:45","startHours":15.191029767018655,"endHours":16.749370177092064,"quality":"auspicious"},{"name":"Amṛta","start":"16:45","end":"18:18","startHours":16.749370177092064,"endHours":18.307710587165477,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Chala","start":"18:18","end":"19:45","startHours":18.307710587165477,"endHours":19.749370177092064,"quality":"neutral"},{"name":"Labha","start":"19:45","end":"21:11","startHours":19.749370177092064,"endHours":21.191029767018655,"quality":"auspicious"},{"name":"Amṛta","start":"21:11","end":"22:38","startHours":21.191029767018655,"endHours":22.632689356945242,"quality":"auspicious"},{"name":"Kāla","start":"22:38","end":"00:04","startHours":22.632689356945242,"endHours":24.07434894687183,"quality":"inauspicious"},{"name":"Śubha","start":"00:04","end":"01:31","startHours":24.07434894687183,"endHours":25.516008536798417,"quality":"auspicious"},{"name":"Roga","start":"01:31","end":"02:57","startHours":25.516008536798417,"endHours":26.957668126725004,"quality":"inauspicious"},{"name":"Udveg","start":"02:57","end":"04:24","startHours":26.957668126725004,"endHours":28.399327716651594,"quality":"inauspicious"},{"name":"Chala","start":"04:24","end":"05:50","startHours":28.399327716651594,"endHours":29.84098730657818,"quality":"neutral"}],"horas":[{"name":"Hora 1","start":"05:50","end":"06:50","startHours":5.8409873065781825,"endHours":6.8409873065781825,"planetary_lord":"Moon"},{"name":"Hora 2","start":"06:50","end":"07:50","startHours":6.8409873065781825,"endHours":7.8409873065781825,"planetary_lord":"Mercury"},{"name":"Hora 3","start":"07:50","end":"08:50","startHours":7.8409873065781825,"endHours":8.840987306578182,"planetary_lord":"Venus"},{"name":"Hora 4","start":"08:50","end":"09:50","startHours":8.840987306578182,"endHours":9.840987306578182,"planetary_lord":"Sun"},{"name":"Hora 5","start":"09:50","end":"10:50","startHours":9.840987306578182,"endHours":10.840987306578182,"planetary_lord":"Mars"},{"name":"Hora 6","start":"10:50","end":"11:50","startHours":10.840987306578182,"endHours":11.840987306578182,"planetary_lord":"Jupiter"},{"name":"Hora 7","start":"11:50","end":"12:50","startHours":11.840987306578182,"endHours":12.840987306578182,"planetary_lord":"Saturn"},{"name":"Hora 8","start":"12:50","end":"13:50","startHours":12.840987306578182,"endHours":13.840987306578182,"planetary_lord":"Moon"},{"name":"Hora 9","start":"13:50","end":"14:50","startHours":13.840987306578182,"endHours":14.840987306578182,"planetary_lord":"Mercury"},{"name":"Hora 10","start":"14:50","end":"15:50","startHours":14.840987306578182,"endHours":15.840987306578182,"planetary_lord":"Venus"},{"name":"Hora 11","start":"15:50","end":"16:50","startHours":15.840987306578182,"endHours":16.84098730657818,"planetary_lord":"Sun"},{"name":"Hora 12","start":"16:50","end":"17:50","startHours":16.84098730657818,"endHours":17.84098730657818,"planetary_lord":"Mars"},{"name":"Hora 13","start":"17:50","end":"18:50","startHours":17.84098730657818,"endHours":18.84098730657818,"planetary_lord":"Jupiter"},{"name":"Hora 14","start":"18:50","end":"19:50","startHours":18.84098730657818,"endHours":19.84098730657818,"planetary_lord":"Saturn"},{"name":"Hora 15","start":"19:50","end":"20:50","startHours":19.84098730657818,"endHours":20.84098730657818,"planetary_lord":"Moon"},{"name":"Hora 16","start":"20:50","end":"21:50","startHours":20.84098730657818,"endHours":21.84098730657818,"planetary_lord":"Mercury"},{"name":"Hora 17","start":"21:50","end":"22:50","startHours":21.84098730657818,"endHours":22.84098730657818,"planetary_lord":"Venus"},{"name":"Hora 18","start":"22:50","end":"23:50","startHours":22.84098730657818,"endHours":23.84098730657818,"planetary_lord":"Sun"},{"name":"Hora 19","start":"23:50","end":"00:50","startHours":23.84098730657818,"endHours":24.84098730657818,"planetary_lord":"Mars"},{"name":"Hora 20","start":"00:50","end":"01:50","startHours":24.84098730657818,"endHours":25.84098730657818,"planetary_lord":"Jupiter"},{"name":"Hora 21","start":"01:50","end":"02:50","startHours":25.84098730657818,"endHours":26.84098730657818,"planetary_lord":"Saturn"},{"name":"Hora 22","start":"02:50","end":"03:50","startHours":26.84098730657818,"endHours":27.84098730657818,"planetary_lord":"Moon"},{"name":"Hora 23","start":"03:50","end":"04:50","startHours":27.84098730657818,"endHours":28.84098730657818,"planetary_lord":"Mercury"},{"name":"Hora 24","start":"04:50","end":"05:50","startHours":28.84098730657818,"endHours":29.84098730657818,"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"},"tropicalRitu":"Śarad (Autumn) (tropical)","vedicRitu":"Varṣā (Monsoon)","tropicalAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-4.024561403372628,"eotMinutes":12.09706318769023,"ayanamsa":23.4584}},"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","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Āśvina","lunar_month_amanta":"Āśvina","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Kanyā (Puraṭṭāsi)","ritu":"Śarad (Autumn)","display_summary":"Āśvina Śukla Pūrṇimā · Vikram 2028 Raktākṣī · Śaka 1893 Virodhakṛt"},"festivals":[{"id":"sharad-purnima","name":"Śarad Pūrṇimā / Kojāgarī Pūrṇimā","name_sanskrit":"शरद पूर्णिमा","tradition":"Vaishnava","associated_deity":"Krishna + Lakṣmī","significance":"Krishna's Mahā-rāsa with the gopīs at Vṛndāvana. Lakṣmī wakes (\"ko jāgartti?\")","vrata":true,"primary_observance":"Night-long jāgaraṇa; offering of pāyasa under moonlight","detection":{"tithi_number":15,"tithi_paksha":"Śukla","lunar_month":"Āśvina"},"precedence":2,"sources":["Bhāgavata 10.29-33"]},{"id":"rasa-purnima","name":"Rāsa Pūrṇimā (Vraja Mahā-Rāsa)","name_sanskrit":"रास पूर्णिमा","tradition":"Vaishnava","associated_deity":"Krishna + Gopīs","significance":"Krishna's Mahā-rāsa with the gopīs at Vraja (Bhāgavata 10.29-33). Same as Śarad Pūrṇimā but emphasized in Vraja tradition.","vrata":false,"detection":{"tithi_number":15,"tithi_paksha":"Śukla","lunar_month":"Āśvina"},"precedence":2},{"id":"valmiki-jayanti","name":"Mahārṣi Vālmīki Jayantī","name_sanskrit":"महर्षि वाल्मीकि जयन्ती","tradition":"Pan-Hindu","associated_deity":"Maharṣi Vālmīki (ādi-kavi)","significance":"Composer of Vālmīki Rāmāyaṇa. Āśvina Pūrṇimā tradition.","vrata":false,"detection":{"tithi_number":15,"tithi_paksha":"Śukla","lunar_month":"Āśvina"},"precedence":3}],"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":[{"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 October 4, 1971 CE · Perth, Australia · Vidhyamitra","description":"October 4, 1971 CE for Perth, Australia: Śukla Pūrṇimā, sūryodaya 05:50, sūryāsta 18:18.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1971-10-04","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1971-10-04","sa":"https://sa.vidhyamitra.com/city/perth/1971-10-04","hi":"https://hi.vidhyamitra.com/city/perth/1971-10-04","x-default":"https://vidhyamitra.com/city/perth/1971-10-04"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-02T05:15:46.716Z","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":"2026-06-02T05:15:46.716Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-02T05:15:46.716Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}