{"id":"vidhyamitra:city-day:perth:1981-10-02:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1981-10-02","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-10-02","date_display":"October 2, 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":2,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444879.770833,"kali_year":5083,"ahargana":1856414.2708,"sun":{"sidereal_longitude":164.4657,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":211.1129,"rashi":8,"rashi_name":"Vṛścika"},"tithi":{"number":4,"name":"Caturthī","paksha":"Śukla","full_name":"Śukla Caturthī","elongation_degrees":46.6473,"elapsed_within_tithi_degrees":10.6473},"nakshatra":{"number":16,"name":"Viśākhā","pada":4,"moon_longitude":211.1129,"elapsed_within_degrees":11.1129},"yoga":{"number":2,"name":"Prīti","sum_longitude":15.5786},"karana":{"half_tithi_index":7,"name":"Viṣṭi"},"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":1981,"month":10,"day":2,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444879.770833,"ahargana":1856414.2708,"kali_year":5083,"ayanamsa_lahiri":23.5981,"grahas":{"sun":{"sidereal_longitude":165.16727100000003,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":false},"moon":{"sidereal_longitude":208.51727099999994,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":16,"name":"Viśākhā","pada":3},"retrograde":false,"latitude":4.1455},"mars":{"sidereal_longitude":115.29867100000001,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Aśleṣā","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":189.74157100000002,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":1},"retrograde":true},"jupiter":{"sidereal_longitude":174.87197100000003,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":1},"retrograde":false},"venus":{"sidereal_longitude":208.77807099999995,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":16,"name":"Viśākhā","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":168.42077100000006,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":3},"retrograde":false},"rahu":{"sidereal_longitude":98.2382,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":278.2382,"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":2,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444879.770833,"kali_year":5083,"ahargana":1856414.2708,"sun":{"sidereal_longitude":164.4657,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":211.1129,"rashi":8,"rashi_name":"Vṛścika"},"tithi":{"number":4,"name":"Caturthī","paksha":"Śukla","full_name":"Śukla Caturthī","elongation_degrees":46.6473,"elapsed_within_tithi_degrees":10.6473},"nakshatra":{"number":16,"name":"Viśākhā","pada":4,"moon_longitude":211.1129,"elapsed_within_degrees":11.1129},"yoga":{"number":2,"name":"Prīti","sum_longitude":15.5786},"karana":{"half_tithi_index":7,"name":"Viṣṭi"},"vara":{"number":0,"name":"Śukravāra (Friday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":4.145,"elongation":46.647},"lunar":{"type":"lunar","occurs":false,"moon_latitude":4.145,"opposition_distance":133.353}},"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":"05:52","sunsetLocal":"18:18","solarNoonLocal":"12:05","dayLengthHours":12.420652068371949,"dayLengthDisplay":"12 Hours 25 Mins 14 Secs","nightLengthDisplay":"11 Hours 34 Mins 46 Secs","moonriseLocal":"08:08","moonsetLocal":"21:49","rahuKala":{"name":"Rāhu Kāla","start":"10:32","end":"12:05","startHours":10.531977825922876,"endHours":12.084559334469368,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"15:11","end":"16:45","startHours":15.189722351562356,"endHours":16.742303860108848,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"07:26","end":"08:59","startHours":7.426814808829889,"endHours":8.979396317376382,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:46","end":"09:11","startHours":8.772385449570184,"endHours":9.186407185182581,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:24","end":"06:43","startHours":6.391760469798893,"endHours":6.722977858288812,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:40","end":"12:30","startHours":11.67053759885697,"endHours":12.498581070081766,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:13","end":"05:03","startHours":4.218146357833802,"endHours":5.046189829058598,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:50","end":"05:52","startHours":4.839178961252399,"endHours":5.874233300283395,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:09","end":"14:59","startHours":14.154668012531362,"endHours":14.982711483756159,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:06","end":"18:30","startHours":18.094885368655344,"endHours":18.494885368655343,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:18","end":"18:49","startHours":18.294885368655343,"endHours":18.81241253817084,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:03","end":"19:48","startHours":18.044885368655343,"endHours":19.794885368655343,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:40","end":"00:30","startHours":23.67053759885697,"endHours":24.498581070081766,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Chala","start":"05:52","end":"07:26","startHours":5.874233300283395,"endHours":7.426814808829889,"quality":"neutral"},{"name":"Labha","start":"07:26","end":"08:59","startHours":7.426814808829889,"endHours":8.979396317376382,"quality":"auspicious"},{"name":"Amṛta","start":"08:59","end":"10:32","startHours":8.979396317376382,"endHours":10.531977825922876,"quality":"auspicious"},{"name":"Kāla","start":"10:32","end":"12:05","startHours":10.531977825922876,"endHours":12.084559334469368,"quality":"inauspicious"},{"name":"Śubha","start":"12:05","end":"13:38","startHours":12.084559334469368,"endHours":13.637140843015864,"quality":"auspicious"},{"name":"Roga","start":"13:38","end":"15:11","startHours":13.637140843015864,"endHours":15.189722351562356,"quality":"inauspicious"},{"name":"Udveg","start":"15:11","end":"16:45","startHours":15.189722351562356,"endHours":16.742303860108848,"quality":"inauspicious"},{"name":"Chala","start":"16:45","end":"18:18","startHours":16.742303860108848,"endHours":18.294885368655343,"quality":"neutral"}],"nightChoghadiyas":[{"name":"Roga","start":"18:18","end":"19:45","startHours":18.294885368655343,"endHours":19.74230386010885,"quality":"inauspicious"},{"name":"Udveg","start":"19:45","end":"21:11","startHours":19.74230386010885,"endHours":21.189722351562356,"quality":"inauspicious"},{"name":"Chala","start":"21:11","end":"22:38","startHours":21.189722351562356,"endHours":22.637140843015864,"quality":"neutral"},{"name":"Labha","start":"22:38","end":"00:05","startHours":22.637140843015864,"endHours":24.08455933446937,"quality":"auspicious"},{"name":"Amṛta","start":"00:05","end":"01:32","startHours":24.08455933446937,"endHours":25.531977825922876,"quality":"auspicious"},{"name":"Kāla","start":"01:32","end":"02:59","startHours":25.531977825922876,"endHours":26.979396317376384,"quality":"inauspicious"},{"name":"Śubha","start":"02:59","end":"04:26","startHours":26.979396317376384,"endHours":28.42681480882989,"quality":"auspicious"},{"name":"Roga","start":"04:26","end":"05:52","startHours":28.42681480882989,"endHours":29.874233300283393,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"05:52","end":"06:52","startHours":5.874233300283395,"endHours":6.874233300283395,"planetary_lord":"Venus"},{"name":"Hora 2","start":"06:52","end":"07:52","startHours":6.874233300283395,"endHours":7.874233300283395,"planetary_lord":"Sun"},{"name":"Hora 3","start":"07:52","end":"08:52","startHours":7.874233300283395,"endHours":8.874233300283395,"planetary_lord":"Mars"},{"name":"Hora 4","start":"08:52","end":"09:52","startHours":8.874233300283395,"endHours":9.874233300283395,"planetary_lord":"Jupiter"},{"name":"Hora 5","start":"09:52","end":"10:52","startHours":9.874233300283395,"endHours":10.874233300283395,"planetary_lord":"Saturn"},{"name":"Hora 6","start":"10:52","end":"11:52","startHours":10.874233300283395,"endHours":11.874233300283395,"planetary_lord":"Moon"},{"name":"Hora 7","start":"11:52","end":"12:52","startHours":11.874233300283395,"endHours":12.874233300283395,"planetary_lord":"Mercury"},{"name":"Hora 8","start":"12:52","end":"13:52","startHours":12.874233300283395,"endHours":13.874233300283395,"planetary_lord":"Venus"},{"name":"Hora 9","start":"13:52","end":"14:52","startHours":13.874233300283395,"endHours":14.874233300283395,"planetary_lord":"Sun"},{"name":"Hora 10","start":"14:52","end":"15:52","startHours":14.874233300283395,"endHours":15.874233300283395,"planetary_lord":"Mars"},{"name":"Hora 11","start":"15:52","end":"16:52","startHours":15.874233300283395,"endHours":16.874233300283393,"planetary_lord":"Jupiter"},{"name":"Hora 12","start":"16:52","end":"17:52","startHours":16.874233300283393,"endHours":17.874233300283393,"planetary_lord":"Saturn"},{"name":"Hora 13","start":"17:52","end":"18:52","startHours":17.874233300283393,"endHours":18.874233300283393,"planetary_lord":"Moon"},{"name":"Hora 14","start":"18:52","end":"19:52","startHours":18.874233300283393,"endHours":19.874233300283393,"planetary_lord":"Mercury"},{"name":"Hora 15","start":"19:52","end":"20:52","startHours":19.874233300283393,"endHours":20.874233300283393,"planetary_lord":"Venus"},{"name":"Hora 16","start":"20:52","end":"21:52","startHours":20.874233300283393,"endHours":21.874233300283393,"planetary_lord":"Sun"},{"name":"Hora 17","start":"21:52","end":"22:52","startHours":21.874233300283393,"endHours":22.874233300283393,"planetary_lord":"Mars"},{"name":"Hora 18","start":"22:52","end":"23:52","startHours":22.874233300283393,"endHours":23.874233300283393,"planetary_lord":"Jupiter"},{"name":"Hora 19","start":"23:52","end":"00:52","startHours":23.874233300283393,"endHours":24.874233300283393,"planetary_lord":"Saturn"},{"name":"Hora 20","start":"00:52","end":"01:52","startHours":24.874233300283393,"endHours":25.874233300283393,"planetary_lord":"Moon"},{"name":"Hora 21","start":"01:52","end":"02:52","startHours":25.874233300283393,"endHours":26.874233300283393,"planetary_lord":"Mercury"},{"name":"Hora 22","start":"02:52","end":"03:52","startHours":26.874233300283393,"endHours":27.874233300283393,"planetary_lord":"Venus"},{"name":"Hora 23","start":"03:52","end":"04:52","startHours":27.874233300283393,"endHours":28.874233300283393,"planetary_lord":"Sun"},{"name":"Hora 24","start":"04:52","end":"05:52","startHours":28.874233300283393,"endHours":29.874233300283393,"planetary_lord":"Mars"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Puṣya","Aśleṣā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Rohiṇī","Mṛgaśirā","Ārdrā","Punarvasu","Hasta","Citrā","Svātī","Viśākhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā"],"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":"West (Paścim)","chandraVasa":"North","rahuVasa":"South-East","anandadiYoga":{"name":"Śrīvatsa","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":-3.474819243039522,"eotMinutes":11.484439931837855,"ayanamsa":23.5981}},"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 Caturthī · 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},{"id":"vinayaka-chaturthi","name":"Vināyaka Caturthī (monthly)","name_sanskrit":"विनायक चतुर्थी","tradition":"Pan-Hindu","associated_deity":"Gaṇeśa","significance":"Monthly Śukla-pakṣa Caturthī; auspicious for new ventures.","vrata":true,"detection":{"tithi_number":4,"tithi_paksha":"Śukla"},"precedence":6}],"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":[{"historical_date":"-0562-04-11","event":"Bhagavān Buddha's birth at Lumbinī","chart_id":"buddha","shared_marker":"same Viśākhā","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 2, 1981 CE · Perth, Australia · Vidhyamitra","description":"October 2, 1981 CE for Perth, Australia: Śukla Caturthī, sūryodaya 05:52, sūryāsta 18:18.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1981-10-02","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1981-10-02","sa":"https://sa.vidhyamitra.com/city/perth/1981-10-02","hi":"https://hi.vidhyamitra.com/city/perth/1981-10-02","x-default":"https://vidhyamitra.com/city/perth/1981-10-02"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-23T03:41:53.202Z","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":"2026-05-23T03:41:53.202Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-23T03:41:53.202Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}