{"id":"vidhyamitra:city-day:perth:1971-10-18:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1971-10-18","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1971-10-18","date_display":"October 18, 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":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2441242.770833,"kali_year":5073,"ahargana":1852777.2708,"sun":{"sidereal_longitude":179.8862,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":165.7766,"rashi":6,"rashi_name":"Kanyā"},"tithi":{"number":29,"name":"Caturdaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Caturdaśī","elongation_degrees":345.8904,"elapsed_within_tithi_degrees":9.8904},"nakshatra":{"number":13,"name":"Hasta","pada":2,"moon_longitude":165.7766,"elapsed_within_degrees":5.7766},"yoga":{"number":26,"name":"Indra","sum_longitude":345.6627},"karana":{"half_tithi_index":57,"name":"Śakuni"},"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":18,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2441242.770833,"ahargana":1852777.2708,"kali_year":5073,"ayanamsa_lahiri":23.459,"grahas":{"sun":{"sidereal_longitude":180.54653099999996,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":14,"name":"Citrā","pada":3},"retrograde":false},"moon":{"sidereal_longitude":166.53703100000007,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":false,"latitude":-3.6774},"mars":{"sidereal_longitude":297.67243099999996,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":2},"retrograde":false},"mercury":{"sidereal_longitude":187.32163100000002,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":1},"retrograde":false},"jupiter":{"sidereal_longitude":223.30713100000003,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","pada":3},"retrograde":false},"venus":{"sidereal_longitude":194.564031,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":42.706631000000016,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":290.944,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":110.944,"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":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2441242.770833,"kali_year":5073,"ahargana":1852777.2708,"sun":{"sidereal_longitude":179.8862,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":165.7766,"rashi":6,"rashi_name":"Kanyā"},"tithi":{"number":29,"name":"Caturdaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Caturdaśī","elongation_degrees":345.8904,"elapsed_within_tithi_degrees":9.8904},"nakshatra":{"number":13,"name":"Hasta","pada":2,"moon_longitude":165.7766,"elapsed_within_degrees":5.7766},"yoga":{"number":26,"name":"Indra","sum_longitude":345.6627},"karana":{"half_tithi_index":57,"name":"Śakuni"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-3.677,"elongation":14.11},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-3.677,"opposition_distance":165.89}},"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":"05:34","sunsetLocal":"18:29","solarNoonLocal":"12:01","dayLengthHours":12.916056477730422,"dayLengthDisplay":"12 Hours 54 Mins 58 Secs","nightLengthDisplay":"11 Hours 05 Mins 02 Secs","moonriseLocal":"04:52","moonsetLocal":"17:18","rahuKala":{"name":"Rāhu Kāla","start":"07:11","end":"08:47","startHours":7.175851184130784,"endHours":8.790358243847088,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"10:24","end":"12:01","startHours":10.40486530356339,"endHours":12.019372363279693,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"13:38","end":"15:15","startHours":13.633879422995996,"endHours":15.248386482712299,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:35","end":"09:00","startHours":8.575090635884912,"endHours":9.00562585180926,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:06","end":"06:27","startHours":6.099513144319916,"endHours":6.4439413170593935,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:35","end":"12:27","startHours":11.588837147355346,"endHours":12.44990757920404,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:50","end":"04:42","startHours":3.839203260717092,"endHours":4.700273692565787,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:29","end":"05:34","startHours":4.485006084603613,"endHours":5.5613441244144814,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:10","end":"15:02","startHours":14.172048442901431,"endHours":15.033118874750127,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:17","end":"18:41","startHours":18.277400602144905,"endHours":18.677400602144903,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:29","end":"19:01","startHours":18.477400602144904,"endHours":19.01556962205034,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:14","end":"19:59","startHours":18.227400602144904,"endHours":19.977400602144904,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:35","end":"00:27","startHours":23.588837147355346,"endHours":24.44990757920404,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Amṛta","start":"05:34","end":"07:11","startHours":5.5613441244144814,"endHours":7.175851184130784,"quality":"auspicious"},{"name":"Kāla","start":"07:11","end":"08:47","startHours":7.175851184130784,"endHours":8.790358243847088,"quality":"inauspicious"},{"name":"Śubha","start":"08:47","end":"10:24","startHours":8.790358243847088,"endHours":10.40486530356339,"quality":"auspicious"},{"name":"Roga","start":"10:24","end":"12:01","startHours":10.40486530356339,"endHours":12.019372363279693,"quality":"inauspicious"},{"name":"Udveg","start":"12:01","end":"13:38","startHours":12.019372363279693,"endHours":13.633879422995996,"quality":"inauspicious"},{"name":"Chala","start":"13:38","end":"15:15","startHours":13.633879422995996,"endHours":15.248386482712299,"quality":"neutral"},{"name":"Labha","start":"15:15","end":"16:52","startHours":15.248386482712299,"endHours":16.8628935424286,"quality":"auspicious"},{"name":"Amṛta","start":"16:52","end":"18:29","startHours":16.8628935424286,"endHours":18.477400602144904,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Chala","start":"18:29","end":"19:52","startHours":18.477400602144904,"endHours":19.8628935424286,"quality":"neutral"},{"name":"Labha","start":"19:52","end":"21:15","startHours":19.8628935424286,"endHours":21.2483864827123,"quality":"auspicious"},{"name":"Amṛta","start":"21:15","end":"22:38","startHours":21.2483864827123,"endHours":22.633879422995996,"quality":"auspicious"},{"name":"Kāla","start":"22:38","end":"00:01","startHours":22.633879422995996,"endHours":24.019372363279693,"quality":"inauspicious"},{"name":"Śubha","start":"00:01","end":"01:24","startHours":24.019372363279693,"endHours":25.40486530356339,"quality":"auspicious"},{"name":"Roga","start":"01:24","end":"02:47","startHours":25.40486530356339,"endHours":26.790358243847088,"quality":"inauspicious"},{"name":"Udveg","start":"02:47","end":"04:11","startHours":26.790358243847088,"endHours":28.175851184130785,"quality":"inauspicious"},{"name":"Chala","start":"04:11","end":"05:34","startHours":28.175851184130785,"endHours":29.561344124414482,"quality":"neutral"}],"horas":[{"name":"Hora 1","start":"05:34","end":"06:34","startHours":5.5613441244144814,"endHours":6.5613441244144814,"planetary_lord":"Moon"},{"name":"Hora 2","start":"06:34","end":"07:34","startHours":6.5613441244144814,"endHours":7.5613441244144814,"planetary_lord":"Mercury"},{"name":"Hora 3","start":"07:34","end":"08:34","startHours":7.5613441244144814,"endHours":8.561344124414482,"planetary_lord":"Venus"},{"name":"Hora 4","start":"08:34","end":"09:34","startHours":8.561344124414482,"endHours":9.561344124414482,"planetary_lord":"Sun"},{"name":"Hora 5","start":"09:34","end":"10:34","startHours":9.561344124414482,"endHours":10.561344124414482,"planetary_lord":"Mars"},{"name":"Hora 6","start":"10:34","end":"11:34","startHours":10.561344124414482,"endHours":11.561344124414482,"planetary_lord":"Jupiter"},{"name":"Hora 7","start":"11:34","end":"12:34","startHours":11.561344124414482,"endHours":12.561344124414482,"planetary_lord":"Saturn"},{"name":"Hora 8","start":"12:34","end":"13:34","startHours":12.561344124414482,"endHours":13.561344124414482,"planetary_lord":"Moon"},{"name":"Hora 9","start":"13:34","end":"14:34","startHours":13.561344124414482,"endHours":14.561344124414482,"planetary_lord":"Mercury"},{"name":"Hora 10","start":"14:34","end":"15:34","startHours":14.561344124414482,"endHours":15.561344124414482,"planetary_lord":"Venus"},{"name":"Hora 11","start":"15:34","end":"16:34","startHours":15.561344124414482,"endHours":16.561344124414482,"planetary_lord":"Sun"},{"name":"Hora 12","start":"16:34","end":"17:34","startHours":16.561344124414482,"endHours":17.561344124414482,"planetary_lord":"Mars"},{"name":"Hora 13","start":"17:34","end":"18:34","startHours":17.561344124414482,"endHours":18.561344124414482,"planetary_lord":"Jupiter"},{"name":"Hora 14","start":"18:34","end":"19:34","startHours":18.561344124414482,"endHours":19.561344124414482,"planetary_lord":"Saturn"},{"name":"Hora 15","start":"19:34","end":"20:34","startHours":19.561344124414482,"endHours":20.561344124414482,"planetary_lord":"Moon"},{"name":"Hora 16","start":"20:34","end":"21:34","startHours":20.561344124414482,"endHours":21.561344124414482,"planetary_lord":"Mercury"},{"name":"Hora 17","start":"21:34","end":"22:34","startHours":21.561344124414482,"endHours":22.561344124414482,"planetary_lord":"Venus"},{"name":"Hora 18","start":"22:34","end":"23:34","startHours":22.561344124414482,"endHours":23.561344124414482,"planetary_lord":"Sun"},{"name":"Hora 19","start":"23:34","end":"00:34","startHours":23.561344124414482,"endHours":24.561344124414482,"planetary_lord":"Mars"},{"name":"Hora 20","start":"00:34","end":"01:34","startHours":24.561344124414482,"endHours":25.561344124414482,"planetary_lord":"Jupiter"},{"name":"Hora 21","start":"01:34","end":"02:34","startHours":25.561344124414482,"endHours":26.561344124414482,"planetary_lord":"Saturn"},{"name":"Hora 22","start":"02:34","end":"03:34","startHours":26.561344124414482,"endHours":27.561344124414482,"planetary_lord":"Moon"},{"name":"Hora 23","start":"03:34","end":"04:34","startHours":27.561344124414482,"endHours":28.561344124414482,"planetary_lord":"Mercury"},{"name":"Hora 24","start":"04:34","end":"05:34","startHours":28.561344124414482,"endHours":29.561344124414482,"planetary_lord":"Venus"}],"taraBala":{"favorable_nakshatras":["Mṛgaśirā","Ārdrā","Punarvasu","Puṣya","Aśleṣā","Citrā","Svātī","Viśākhā","Anurādhā","Jyeṣṭhā","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Rohiṇī","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Mithuna","Karka","Kanyā","Vṛścika","Kumbha","Mīna"],"unfavorable_rashis":["Meṣa","Vṛṣabha","Siṃha","Tulā","Dhanu","Makara"]},"dishaShool":"East (Pūrva)","chandraVasa":"North-West","rahuVasa":"North-East","anandadiYoga":{"name":"Mṛtyu","quality":"Inauspicious"},"tropicalRitu":"Śarad (Autumn)","vedicRitu":"Śarad (Autumn)","tropicalAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-9.311822134795271,"eotMinutes":15.395658203218455,"ayanamsa":23.459}},"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 Kṛṣṇa Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Kārtika","lunar_month_amanta":"Āśvina","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 Kṛṣṇa Caturdaśī · Vikram 2028 Raktākṣī · Śaka 1893 Virodhakṛt"},"festivals":[{"id":"naraka-chaturdashi","name":"Naraka Caturdaśī (Choṭī Diwālī)","name_sanskrit":"नरक चतुर्दशी","tradition":"Vaishnava","associated_deity":"Krishna (Narakāsura-vadha)","significance":"Krishna slew Narakāsura, freeing 16,000 captive princesses. Day 2 of Diwali.","vrata":true,"detection":{"tithi_number":29,"tithi_paksha":"Kṛṣṇa","lunar_month":"Kārtika"},"precedence":2,"sources":["Bhāgavata 10.59"]},{"id":"tula-sankranti","name":"Tulā Saṅkrānti","name_sanskrit":"तुला सङ्क्रान्ति","tradition":"Pan-Hindu","significance":"Sun enters Libra.","vrata":false,"detection":{"sun_rashi_ingress":"Tulā"},"precedence":5},{"id":"masika-shivaratri","name":"Māsika Śivarātri","name_sanskrit":"मासिक शिवरात्रि","tradition":"Shaiva","associated_deity":"Śiva","significance":"Monthly Śiva observance.","vrata":true,"detection":{"tithi_number":29,"tithi_paksha":"Kṛṣṇa"},"precedence":6}],"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 18, 1971 CE · Perth, Australia · Vidhyamitra","description":"October 18, 1971 CE for Perth, Australia: Kṛṣṇa Caturdaśī, sūryodaya 05:34, sūryāsta 18:29.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1971-10-18","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1971-10-18","sa":"https://sa.vidhyamitra.com/city/perth/1971-10-18","hi":"https://hi.vidhyamitra.com/city/perth/1971-10-18","x-default":"https://vidhyamitra.com/city/perth/1971-10-18"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-02T20:27:42.975Z","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":"2026-06-02T20:27:42.975Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-02T20:27:42.975Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}