{"id":"vidhyamitra:city-day:perth:1981-10-01:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1981-10-01","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-10-01","date_display":"October 1, 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":1,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444878.770833,"kali_year":5083,"ahargana":1856413.2708,"sun":{"sidereal_longitude":163.4822,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":198.8883,"rashi":7,"rashi_name":"Tulā"},"tithi":{"number":3,"name":"Tṛtīyā","paksha":"Śukla","full_name":"Śukla Tṛtīyā","elongation_degrees":35.406,"elapsed_within_tithi_degrees":11.406},"nakshatra":{"number":15,"name":"Svātī","pada":4,"moon_longitude":198.8883,"elapsed_within_degrees":12.2216},"yoga":{"number":1,"name":"Viṣkambha","sum_longitude":2.3705},"karana":{"half_tithi_index":5,"name":"Gara"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"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":1,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444878.770833,"ahargana":1856413.2708,"kali_year":5083,"ayanamsa_lahiri":23.598,"grahas":{"sun":{"sidereal_longitude":164.18370900000002,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":false},"moon":{"sidereal_longitude":196.537109,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":3},"retrograde":false,"latitude":4.4231},"mars":{"sidereal_longitude":114.69100900000001,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Aśleṣā","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":189.24150899999995,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":1},"retrograde":true},"jupiter":{"sidereal_longitude":174.65580899999998,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":1},"retrograde":false},"venus":{"sidereal_longitude":207.63300900000002,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":16,"name":"Viśākhā","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":168.29820900000004,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":3},"retrograde":false},"rahu":{"sidereal_longitude":98.2912,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":278.2912,"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":1,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444878.770833,"kali_year":5083,"ahargana":1856413.2708,"sun":{"sidereal_longitude":163.4822,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":198.8883,"rashi":7,"rashi_name":"Tulā"},"tithi":{"number":3,"name":"Tṛtīyā","paksha":"Śukla","full_name":"Śukla Tṛtīyā","elongation_degrees":35.406,"elapsed_within_tithi_degrees":11.406},"nakshatra":{"number":15,"name":"Svātī","pada":4,"moon_longitude":198.8883,"elapsed_within_degrees":12.2216},"yoga":{"number":1,"name":"Viṣkambha","sum_longitude":2.3705},"karana":{"half_tithi_index":5,"name":"Gara"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":4.423,"elongation":35.406},"lunar":{"type":"lunar","occurs":false,"moon_latitude":4.423,"opposition_distance":144.594}},"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":"18:17","solarNoonLocal":"12:05","dayLengthHours":12.388202277919001,"dayLengthDisplay":"12 Hours 23 Mins 18 Secs","nightLengthDisplay":"11 Hours 36 Mins 42 Secs","moonriseLocal":"07:34","moonsetLocal":"20:56","rahuKala":{"name":"Rāhu Kāla","start":"13:38","end":"15:11","startHours":13.6383625482968,"endHours":15.186887833036677,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"05:54","end":"07:27","startHours":5.895736124597425,"endHours":7.4442614093373,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"09:00","end":"10:32","startHours":8.992786694077175,"endHours":10.54131197881705,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:47","end":"09:12","startHours":8.78631665611186,"endHours":9.199256732042493,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:25","end":"06:45","startHours":6.411911219510717,"endHours":6.742263280255224,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:41","end":"12:30","startHours":11.676897187626293,"endHours":12.50277733948756,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:15","end":"05:04","startHours":4.2439758208748914,"endHours":5.069855972736159,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:52","end":"05:54","startHours":4.863385934770841,"endHours":5.895736124597425,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:09","end":"14:59","startHours":14.154537643210093,"endHours":14.980417795071359,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:05","end":"18:29","startHours":18.083938402516427,"endHours":18.483938402516426,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:17","end":"18:48","startHours":18.283938402516426,"endHours":18.800113497429717,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:02","end":"19:47","startHours":18.033938402516426,"endHours":19.783938402516426,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:41","end":"00:30","startHours":23.67689718762629,"endHours":24.50277733948756,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Śubha","start":"05:54","end":"07:27","startHours":5.895736124597425,"endHours":7.4442614093373,"quality":"auspicious"},{"name":"Roga","start":"07:27","end":"09:00","startHours":7.4442614093373,"endHours":8.992786694077175,"quality":"inauspicious"},{"name":"Udveg","start":"09:00","end":"10:32","startHours":8.992786694077175,"endHours":10.54131197881705,"quality":"inauspicious"},{"name":"Chala","start":"10:32","end":"12:05","startHours":10.54131197881705,"endHours":12.089837263556927,"quality":"neutral"},{"name":"Labha","start":"12:05","end":"13:38","startHours":12.089837263556927,"endHours":13.6383625482968,"quality":"auspicious"},{"name":"Amṛta","start":"13:38","end":"15:11","startHours":13.6383625482968,"endHours":15.186887833036677,"quality":"auspicious"},{"name":"Kāla","start":"15:11","end":"16:44","startHours":15.186887833036677,"endHours":16.735413117776552,"quality":"inauspicious"},{"name":"Śubha","start":"16:44","end":"18:17","startHours":16.735413117776552,"endHours":18.283938402516426,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Amṛta","start":"18:17","end":"19:44","startHours":18.283938402516426,"endHours":19.735413117776552,"quality":"auspicious"},{"name":"Kāla","start":"19:44","end":"21:11","startHours":19.735413117776552,"endHours":21.186887833036675,"quality":"inauspicious"},{"name":"Śubha","start":"21:11","end":"22:38","startHours":21.186887833036675,"endHours":22.6383625482968,"quality":"auspicious"},{"name":"Roga","start":"22:38","end":"00:05","startHours":22.6383625482968,"endHours":24.089837263556927,"quality":"inauspicious"},{"name":"Udveg","start":"00:05","end":"01:32","startHours":24.089837263556927,"endHours":25.54131197881705,"quality":"inauspicious"},{"name":"Chala","start":"01:32","end":"03:00","startHours":25.54131197881705,"endHours":26.992786694077175,"quality":"neutral"},{"name":"Labha","start":"03:00","end":"04:27","startHours":26.992786694077175,"endHours":28.4442614093373,"quality":"auspicious"},{"name":"Amṛta","start":"04:27","end":"05:54","startHours":28.4442614093373,"endHours":29.895736124597427,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"05:54","end":"06:54","startHours":5.895736124597425,"endHours":6.895736124597425,"planetary_lord":"Jupiter"},{"name":"Hora 2","start":"06:54","end":"07:54","startHours":6.895736124597425,"endHours":7.895736124597425,"planetary_lord":"Saturn"},{"name":"Hora 3","start":"07:54","end":"08:54","startHours":7.895736124597425,"endHours":8.895736124597425,"planetary_lord":"Moon"},{"name":"Hora 4","start":"08:54","end":"09:54","startHours":8.895736124597425,"endHours":9.895736124597425,"planetary_lord":"Mercury"},{"name":"Hora 5","start":"09:54","end":"10:54","startHours":9.895736124597425,"endHours":10.895736124597425,"planetary_lord":"Venus"},{"name":"Hora 6","start":"10:54","end":"11:54","startHours":10.895736124597425,"endHours":11.895736124597425,"planetary_lord":"Sun"},{"name":"Hora 7","start":"11:54","end":"12:54","startHours":11.895736124597425,"endHours":12.895736124597425,"planetary_lord":"Mars"},{"name":"Hora 8","start":"12:54","end":"13:54","startHours":12.895736124597425,"endHours":13.895736124597425,"planetary_lord":"Jupiter"},{"name":"Hora 9","start":"13:54","end":"14:54","startHours":13.895736124597425,"endHours":14.895736124597425,"planetary_lord":"Saturn"},{"name":"Hora 10","start":"14:54","end":"15:54","startHours":14.895736124597425,"endHours":15.895736124597425,"planetary_lord":"Moon"},{"name":"Hora 11","start":"15:54","end":"16:54","startHours":15.895736124597425,"endHours":16.895736124597427,"planetary_lord":"Mercury"},{"name":"Hora 12","start":"16:54","end":"17:54","startHours":16.895736124597427,"endHours":17.895736124597427,"planetary_lord":"Venus"},{"name":"Hora 13","start":"17:54","end":"18:54","startHours":17.895736124597427,"endHours":18.895736124597427,"planetary_lord":"Sun"},{"name":"Hora 14","start":"18:54","end":"19:54","startHours":18.895736124597427,"endHours":19.895736124597427,"planetary_lord":"Mars"},{"name":"Hora 15","start":"19:54","end":"20:54","startHours":19.895736124597427,"endHours":20.895736124597427,"planetary_lord":"Jupiter"},{"name":"Hora 16","start":"20:54","end":"21:54","startHours":20.895736124597427,"endHours":21.895736124597427,"planetary_lord":"Saturn"},{"name":"Hora 17","start":"21:54","end":"22:54","startHours":21.895736124597427,"endHours":22.895736124597427,"planetary_lord":"Moon"},{"name":"Hora 18","start":"22:54","end":"23:54","startHours":22.895736124597427,"endHours":23.895736124597427,"planetary_lord":"Mercury"},{"name":"Hora 19","start":"23:54","end":"00:54","startHours":23.895736124597427,"endHours":24.895736124597427,"planetary_lord":"Venus"},{"name":"Hora 20","start":"00:54","end":"01:54","startHours":24.895736124597427,"endHours":25.895736124597427,"planetary_lord":"Sun"},{"name":"Hora 21","start":"01:54","end":"02:54","startHours":25.895736124597427,"endHours":26.895736124597427,"planetary_lord":"Mars"},{"name":"Hora 22","start":"02:54","end":"03:54","startHours":26.895736124597427,"endHours":27.895736124597427,"planetary_lord":"Jupiter"},{"name":"Hora 23","start":"03:54","end":"04:54","startHours":27.895736124597427,"endHours":28.895736124597427,"planetary_lord":"Saturn"},{"name":"Hora 24","start":"04:54","end":"05:54","startHours":28.895736124597427,"endHours":29.895736124597427,"planetary_lord":"Moon"}],"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":"South (Dakṣiṇa)","chandraVasa":"North","rahuVasa":"North-West","anandadiYoga":{"name":"Dhūmra","quality":"Inauspicious"},"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":-3.0870251583370667,"eotMinutes":11.167764186584405,"ayanamsa":23.598}},"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 Tṛtīyā · 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}],"todays_walk":{"walk":{"id":"guru-walk","name":"Bṛhaspati Walk","name_sanskrit":"गुरु यात्रा","type":"graha","description":"Wisdom transmission + BG 4.34.","step_count":8,"url":"/walk/guru-walk"},"reason":"Guruvāra (Thursday) — 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, 1981 CE · Perth, Australia · Vidhyamitra","description":"October 1, 1981 CE for Perth, Australia: Śukla Tṛtīyā, sūryodaya 05:54, sūryāsta 18:17.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1981-10-01","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1981-10-01","sa":"https://sa.vidhyamitra.com/city/perth/1981-10-01","hi":"https://hi.vidhyamitra.com/city/perth/1981-10-01","x-default":"https://vidhyamitra.com/city/perth/1981-10-01"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-18T10:44:56.611Z","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":"2026-05-18T10:44:56.611Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-18T10:44:56.611Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}