{"id":"vidhyamitra:city-day:perth:1971-10-20:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1971-10-20","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1971-10-20","date_display":"October 20, 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":20,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2441244.770833,"kali_year":5073,"ahargana":1852779.2708,"sun":{"sidereal_longitude":181.8771,"rashi":7,"rashi_name":"Tulā"},"moon":{"sidereal_longitude":190.983,"rashi":7,"rashi_name":"Tulā"},"tithi":{"number":1,"name":"Pratipada","paksha":"Śukla","full_name":"Śukla Pratipada","elongation_degrees":9.1058,"elapsed_within_tithi_degrees":9.1058},"nakshatra":{"number":15,"name":"Svātī","pada":2,"moon_longitude":190.983,"elapsed_within_degrees":4.3163},"yoga":{"number":1,"name":"Viṣkambha","sum_longitude":12.8601},"karana":{"half_tithi_index":1,"name":"Bava"},"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":1971,"month":10,"day":20,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2441244.770833,"ahargana":1852779.2708,"kali_year":5073,"ayanamsa_lahiri":23.4591,"grahas":{"sun":{"sidereal_longitude":182.533055,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":14,"name":"Citrā","pada":3},"retrograde":false},"moon":{"sidereal_longitude":190.303855,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":2},"retrograde":false,"latitude":-4.4335},"mars":{"sidereal_longitude":298.5177550000001,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":2},"retrograde":false},"mercury":{"sidereal_longitude":190.54575499999999,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":2},"retrograde":false},"jupiter":{"sidereal_longitude":223.69545500000004,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","pada":4},"retrograde":false},"venus":{"sidereal_longitude":197.05605500000001,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":4},"retrograde":false},"saturn":{"sidereal_longitude":42.60425499999997,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":290.838,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":110.838,"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":20,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2441244.770833,"kali_year":5073,"ahargana":1852779.2708,"sun":{"sidereal_longitude":181.8771,"rashi":7,"rashi_name":"Tulā"},"moon":{"sidereal_longitude":190.983,"rashi":7,"rashi_name":"Tulā"},"tithi":{"number":1,"name":"Pratipada","paksha":"Śukla","full_name":"Śukla Pratipada","elongation_degrees":9.1058,"elapsed_within_tithi_degrees":9.1058},"nakshatra":{"number":15,"name":"Svātī","pada":2,"moon_longitude":190.983,"elapsed_within_degrees":4.3163},"yoga":{"number":1,"name":"Viṣkambha","sum_longitude":12.8601},"karana":{"half_tithi_index":1,"name":"Bava"},"vara":{"number":5,"name":"Budhavāra (Wednesday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-4.433,"elongation":9.106},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-4.433,"opposition_distance":170.894}},"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":"05:31","sunsetLocal":"18:30","solarNoonLocal":"12:01","dayLengthHours":12.9789899693493,"dayLengthDisplay":"12 Hours 58 Mins 44 Secs","nightLengthDisplay":"11 Hours 01 Mins 16 Secs","moonriseLocal":"05:57","moonsetLocal":"19:07","rahuKala":{"name":"Rāhu Kāla","start":"12:01","end":"13:38","startHours":12.014352145929479,"endHours":13.636725892098141,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"07:09","end":"08:46","startHours":7.147230907423491,"endHours":8.769604653592154,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"10:24","end":"12:01","startHours":10.391978399760816,"endHours":12.014352145929479,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:33","end":"08:59","startHours":8.553288154102999,"endHours":8.985921153081309,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:04","end":"06:25","startHours":6.065648409977716,"endHours":6.411754809160364,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:35","end":"12:27","startHours":11.581719146951169,"endHours":12.446985144907789,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:48","end":"04:40","startHours":3.794325165341589,"endHours":4.659591163298209,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:27","end":"05:31","startHours":4.443274663809055,"endHours":5.524857161254829,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:11","end":"15:03","startHours":14.177517140821028,"endHours":15.042783138777647,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:18","end":"18:42","startHours":18.30384713060413,"endHours":18.703847130604128,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:30","end":"19:03","startHours":18.50384713060413,"endHours":19.044638379327015,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:15","end":"20:00","startHours":18.25384713060413,"endHours":20.00384713060413,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:35","end":"00:27","startHours":23.58171914695117,"endHours":24.44698514490779,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Labha","start":"05:31","end":"07:09","startHours":5.524857161254829,"endHours":7.147230907423491,"quality":"auspicious"},{"name":"Amṛta","start":"07:09","end":"08:46","startHours":7.147230907423491,"endHours":8.769604653592154,"quality":"auspicious"},{"name":"Kāla","start":"08:46","end":"10:24","startHours":8.769604653592154,"endHours":10.391978399760816,"quality":"inauspicious"},{"name":"Śubha","start":"10:24","end":"12:01","startHours":10.391978399760816,"endHours":12.014352145929479,"quality":"auspicious"},{"name":"Roga","start":"12:01","end":"13:38","startHours":12.014352145929479,"endHours":13.636725892098141,"quality":"inauspicious"},{"name":"Udveg","start":"13:38","end":"15:16","startHours":13.636725892098141,"endHours":15.259099638266804,"quality":"inauspicious"},{"name":"Chala","start":"15:16","end":"16:53","startHours":15.259099638266804,"endHours":16.881473384435466,"quality":"neutral"},{"name":"Labha","start":"16:53","end":"18:30","startHours":16.881473384435466,"endHours":18.50384713060413,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Udveg","start":"18:30","end":"19:53","startHours":18.50384713060413,"endHours":19.881473384435466,"quality":"inauspicious"},{"name":"Chala","start":"19:53","end":"21:16","startHours":19.881473384435466,"endHours":21.259099638266804,"quality":"neutral"},{"name":"Labha","start":"21:16","end":"22:38","startHours":21.259099638266804,"endHours":22.63672589209814,"quality":"auspicious"},{"name":"Amṛta","start":"22:38","end":"00:01","startHours":22.63672589209814,"endHours":24.01435214592948,"quality":"auspicious"},{"name":"Kāla","start":"00:01","end":"01:24","startHours":24.01435214592948,"endHours":25.391978399760816,"quality":"inauspicious"},{"name":"Śubha","start":"01:24","end":"02:46","startHours":25.391978399760816,"endHours":26.769604653592154,"quality":"auspicious"},{"name":"Roga","start":"02:46","end":"04:09","startHours":26.769604653592154,"endHours":28.14723090742349,"quality":"inauspicious"},{"name":"Udveg","start":"04:09","end":"05:31","startHours":28.14723090742349,"endHours":29.52485716125483,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"05:31","end":"06:31","startHours":5.524857161254829,"endHours":6.524857161254829,"planetary_lord":"Mercury"},{"name":"Hora 2","start":"06:31","end":"07:31","startHours":6.524857161254829,"endHours":7.524857161254829,"planetary_lord":"Venus"},{"name":"Hora 3","start":"07:31","end":"08:31","startHours":7.524857161254829,"endHours":8.524857161254829,"planetary_lord":"Sun"},{"name":"Hora 4","start":"08:31","end":"09:31","startHours":8.524857161254829,"endHours":9.524857161254829,"planetary_lord":"Mars"},{"name":"Hora 5","start":"09:31","end":"10:31","startHours":9.524857161254829,"endHours":10.524857161254829,"planetary_lord":"Jupiter"},{"name":"Hora 6","start":"10:31","end":"11:31","startHours":10.524857161254829,"endHours":11.524857161254829,"planetary_lord":"Saturn"},{"name":"Hora 7","start":"11:31","end":"12:31","startHours":11.524857161254829,"endHours":12.524857161254829,"planetary_lord":"Moon"},{"name":"Hora 8","start":"12:31","end":"13:31","startHours":12.524857161254829,"endHours":13.524857161254829,"planetary_lord":"Mercury"},{"name":"Hora 9","start":"13:31","end":"14:31","startHours":13.524857161254829,"endHours":14.524857161254829,"planetary_lord":"Venus"},{"name":"Hora 10","start":"14:31","end":"15:31","startHours":14.524857161254829,"endHours":15.524857161254829,"planetary_lord":"Sun"},{"name":"Hora 11","start":"15:31","end":"16:31","startHours":15.524857161254829,"endHours":16.52485716125483,"planetary_lord":"Mars"},{"name":"Hora 12","start":"16:31","end":"17:31","startHours":16.52485716125483,"endHours":17.52485716125483,"planetary_lord":"Jupiter"},{"name":"Hora 13","start":"17:31","end":"18:31","startHours":17.52485716125483,"endHours":18.52485716125483,"planetary_lord":"Saturn"},{"name":"Hora 14","start":"18:31","end":"19:31","startHours":18.52485716125483,"endHours":19.52485716125483,"planetary_lord":"Moon"},{"name":"Hora 15","start":"19:31","end":"20:31","startHours":19.52485716125483,"endHours":20.52485716125483,"planetary_lord":"Mercury"},{"name":"Hora 16","start":"20:31","end":"21:31","startHours":20.52485716125483,"endHours":21.52485716125483,"planetary_lord":"Venus"},{"name":"Hora 17","start":"21:31","end":"22:31","startHours":21.52485716125483,"endHours":22.52485716125483,"planetary_lord":"Sun"},{"name":"Hora 18","start":"22:31","end":"23:31","startHours":22.52485716125483,"endHours":23.52485716125483,"planetary_lord":"Mars"},{"name":"Hora 19","start":"23:31","end":"00:31","startHours":23.52485716125483,"endHours":24.52485716125483,"planetary_lord":"Jupiter"},{"name":"Hora 20","start":"00:31","end":"01:31","startHours":24.52485716125483,"endHours":25.52485716125483,"planetary_lord":"Saturn"},{"name":"Hora 21","start":"01:31","end":"02:31","startHours":25.52485716125483,"endHours":26.52485716125483,"planetary_lord":"Moon"},{"name":"Hora 22","start":"02:31","end":"03:31","startHours":26.52485716125483,"endHours":27.52485716125483,"planetary_lord":"Mercury"},{"name":"Hora 23","start":"03:31","end":"04:31","startHours":27.52485716125483,"endHours":28.52485716125483,"planetary_lord":"Venus"},{"name":"Hora 24","start":"04:31","end":"05:31","startHours":28.52485716125483,"endHours":29.52485716125483,"planetary_lord":"Sun"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Punarvasu","Puṣya","Aśleṣā","Maghā","Pūrva Phalgunī","Viśākhā","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Kṛttikā","Rohiṇī","Mṛgaśirā","Ārdrā","Uttara Phalgunī","Hasta","Citrā","Svātī","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Meṣa","Karka","Siṃha","Tulā","Dhanu","Mīna"],"unfavorable_rashis":["Vṛṣabha","Mithuna","Kanyā","Vṛścika","Makara","Kumbha"]},"dishaShool":"North (Uttara)","chandraVasa":"North","rahuVasa":"South-West","anandadiYoga":{"name":"Sushira","quality":"Auspicious"},"tropicalRitu":"Śarad (Autumn)","vedicRitu":"Śarad (Autumn)","tropicalAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-10.038244286136269,"eotMinutes":15.696871244231174,"ayanamsa":23.4591}},"calendars":{"vikram_samvat":2028,"vikram_samvatsara":"Raktākṣī","saka_samvat":1893,"saka_samvatsara":"Virodhakṛt","bengali_samvat":1378,"malayalam_era":1147,"nanakshahi_year":502,"lunar_month":"Kārtika","lunar_month_paksha_full":"Kārtika Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Kārtika","lunar_month_amanta":"Kārtika","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Tulā (Aippasi)","ritu":"Śarad (Autumn)","display_summary":"Kārtika Śukla Pratipada · Vikram 2028 Raktākṣī · Śaka 1893 Virodhakṛt"},"festivals":[{"id":"govardhana-puja","name":"Govardhana Pūjā (Annakūṭa)","name_sanskrit":"गोवर्धन पूजा","tradition":"Vaishnava","associated_deity":"Krishna (Govardhana-dhārī)","significance":"Krishna lifted Govardhana to protect Vraja from Indra's wrath. Day 4 of Diwali.","vrata":true,"detection":{"tithi_number":1,"tithi_paksha":"Śukla","lunar_month":"Kārtika"},"precedence":2,"sources":["Bhāgavata 10.24-27"]}],"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":"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 October 20, 1971 CE · Perth, Australia · Vidhyamitra","description":"October 20, 1971 CE for Perth, Australia: Śukla Pratipada, sūryodaya 05:31, sūryāsta 18:30.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1971-10-20","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1971-10-20","sa":"https://sa.vidhyamitra.com/city/perth/1971-10-20","hi":"https://hi.vidhyamitra.com/city/perth/1971-10-20","x-default":"https://vidhyamitra.com/city/perth/1971-10-20"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-03T05:51:19.106Z","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":"2026-06-03T05:51:19.106Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-03T05:51:19.106Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}