{"id":"vidhyamitra:city-day:perth:1981-09-06:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1981-09-06","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-09-06","date_display":"September 6, 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":9,"day":6,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444853.770833,"kali_year":5083,"ahargana":1856388.2708,"sun":{"sidereal_longitude":139.1129,"rashi":5,"rashi_name":"Siṃha"},"moon":{"sidereal_longitude":225.4352,"rashi":8,"rashi_name":"Vṛścika"},"tithi":{"number":8,"name":"Aṣṭamī","paksha":"Śukla","full_name":"Śukla Aṣṭamī","elongation_degrees":86.3223,"elapsed_within_tithi_degrees":2.3223},"nakshatra":{"number":17,"name":"Anurādhā","pada":4,"moon_longitude":225.4352,"elapsed_within_degrees":12.1019},"yoga":{"number":1,"name":"Viṣkambha","sum_longitude":4.5481},"karana":{"half_tithi_index":14,"name":"Viṣṭi"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"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":9,"day":6,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444853.770833,"ahargana":1856388.2708,"kali_year":5083,"ayanamsa_lahiri":23.5971,"grahas":{"sun":{"sidereal_longitude":139.772764,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":2},"retrograde":false},"moon":{"sidereal_longitude":224.08116399999994,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","pada":4},"retrograde":false,"latitude":3.6476},"mars":{"sidereal_longitude":99.17056400000001,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":2},"retrograde":false},"mercury":{"sidereal_longitude":161.247664,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":1},"retrograde":false},"jupiter":{"sidereal_longitude":169.39866400000005,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":3},"retrograde":false},"venus":{"sidereal_longitude":178.55386399999998,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":165.31446400000004,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":false},"rahu":{"sidereal_longitude":99.6158,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":279.6158,"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":9,"day":6,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444853.770833,"kali_year":5083,"ahargana":1856388.2708,"sun":{"sidereal_longitude":139.1129,"rashi":5,"rashi_name":"Siṃha"},"moon":{"sidereal_longitude":225.4352,"rashi":8,"rashi_name":"Vṛścika"},"tithi":{"number":8,"name":"Aṣṭamī","paksha":"Śukla","full_name":"Śukla Aṣṭamī","elongation_degrees":86.3223,"elapsed_within_tithi_degrees":2.3223},"nakshatra":{"number":17,"name":"Anurādhā","pada":4,"moon_longitude":225.4352,"elapsed_within_degrees":12.1019},"yoga":{"number":1,"name":"Viṣkambha","sum_longitude":4.5481},"karana":{"half_tithi_index":14,"name":"Viṣṭi"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":3.648,"elongation":86.322},"lunar":{"type":"lunar","occurs":false,"moon_latitude":3.648,"opposition_distance":93.678}},"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":"06:27","sunsetLocal":"18:02","solarNoonLocal":"12:14","dayLengthHours":11.585666421940381,"dayLengthDisplay":"11 Hours 35 Mins 08 Secs","nightLengthDisplay":"12 Hours 24 Mins 52 Secs","moonriseLocal":"10:51","moonsetLocal":"00:52","rahuKala":{"name":"Rāhu Kāla","start":"16:35","end":"18:02","startHours":16.583908112976967,"endHours":18.032116415719514,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"12:14","end":"13:41","startHours":12.239283204749324,"endHours":13.687491507491872,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"15:08","end":"16:35","startHours":15.13569981023442,"endHours":16.583908112976967,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:09","end":"09:32","startHours":9.149772158898557,"endHours":9.535961039629903,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:56","end":"07:14","startHours":6.929186094693317,"endHours":7.238137199278394,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:51","end":"12:38","startHours":11.853094324017977,"endHours":12.62547208548067,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:54","end":"05:40","startHours":4.90169447085375,"endHours":5.674072232316442,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:29","end":"06:27","startHours":5.480977791950769,"endHours":6.446449993779134,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:10","end":"14:57","startHours":14.170227608406055,"endHours":14.942605369868748,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:50","end":"18:14","startHours":17.832116415719515,"endHours":18.232116415719513,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:02","end":"18:31","startHours":18.032116415719514,"endHours":18.514852516633695,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:47","end":"19:32","startHours":17.782116415719514,"endHours":19.532116415719514,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:51","end":"00:38","startHours":23.853094324017977,"endHours":24.62547208548067,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Udveg","start":"06:27","end":"07:54","startHours":6.446449993779134,"endHours":7.894658296521682,"quality":"inauspicious"},{"name":"Chala","start":"07:54","end":"09:21","startHours":7.894658296521682,"endHours":9.34286659926423,"quality":"neutral"},{"name":"Labha","start":"09:21","end":"10:47","startHours":9.34286659926423,"endHours":10.791074902006777,"quality":"auspicious"},{"name":"Amṛta","start":"10:47","end":"12:14","startHours":10.791074902006777,"endHours":12.239283204749324,"quality":"auspicious"},{"name":"Kāla","start":"12:14","end":"13:41","startHours":12.239283204749324,"endHours":13.687491507491872,"quality":"inauspicious"},{"name":"Śubha","start":"13:41","end":"15:08","startHours":13.687491507491872,"endHours":15.13569981023442,"quality":"auspicious"},{"name":"Roga","start":"15:08","end":"16:35","startHours":15.13569981023442,"endHours":16.583908112976967,"quality":"inauspicious"},{"name":"Udveg","start":"16:35","end":"18:02","startHours":16.583908112976967,"endHours":18.032116415719514,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Śubha","start":"18:02","end":"19:35","startHours":18.032116415719514,"endHours":19.583908112976967,"quality":"auspicious"},{"name":"Roga","start":"19:35","end":"21:08","startHours":19.583908112976967,"endHours":21.13569981023442,"quality":"inauspicious"},{"name":"Udveg","start":"21:08","end":"22:41","startHours":21.13569981023442,"endHours":22.68749150749187,"quality":"inauspicious"},{"name":"Chala","start":"22:41","end":"00:14","startHours":22.68749150749187,"endHours":24.239283204749324,"quality":"neutral"},{"name":"Labha","start":"00:14","end":"01:47","startHours":24.239283204749324,"endHours":25.791074902006777,"quality":"auspicious"},{"name":"Amṛta","start":"01:47","end":"03:21","startHours":25.791074902006777,"endHours":27.342866599264227,"quality":"auspicious"},{"name":"Kāla","start":"03:21","end":"04:54","startHours":27.342866599264227,"endHours":28.89465829652168,"quality":"inauspicious"},{"name":"Śubha","start":"04:54","end":"06:27","startHours":28.89465829652168,"endHours":30.446449993779133,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"06:27","end":"07:27","startHours":6.446449993779134,"endHours":7.446449993779134,"planetary_lord":"Sun"},{"name":"Hora 2","start":"07:27","end":"08:27","startHours":7.446449993779134,"endHours":8.446449993779133,"planetary_lord":"Mars"},{"name":"Hora 3","start":"08:27","end":"09:27","startHours":8.446449993779133,"endHours":9.446449993779133,"planetary_lord":"Jupiter"},{"name":"Hora 4","start":"09:27","end":"10:27","startHours":9.446449993779133,"endHours":10.446449993779133,"planetary_lord":"Saturn"},{"name":"Hora 5","start":"10:27","end":"11:27","startHours":10.446449993779133,"endHours":11.446449993779133,"planetary_lord":"Moon"},{"name":"Hora 6","start":"11:27","end":"12:27","startHours":11.446449993779133,"endHours":12.446449993779133,"planetary_lord":"Mercury"},{"name":"Hora 7","start":"12:27","end":"13:27","startHours":12.446449993779133,"endHours":13.446449993779133,"planetary_lord":"Venus"},{"name":"Hora 8","start":"13:27","end":"14:27","startHours":13.446449993779133,"endHours":14.446449993779133,"planetary_lord":"Sun"},{"name":"Hora 9","start":"14:27","end":"15:27","startHours":14.446449993779133,"endHours":15.446449993779133,"planetary_lord":"Mars"},{"name":"Hora 10","start":"15:27","end":"16:27","startHours":15.446449993779133,"endHours":16.446449993779133,"planetary_lord":"Jupiter"},{"name":"Hora 11","start":"16:27","end":"17:27","startHours":16.446449993779133,"endHours":17.446449993779133,"planetary_lord":"Saturn"},{"name":"Hora 12","start":"17:27","end":"18:27","startHours":17.446449993779133,"endHours":18.446449993779133,"planetary_lord":"Moon"},{"name":"Hora 13","start":"18:27","end":"19:27","startHours":18.446449993779133,"endHours":19.446449993779133,"planetary_lord":"Mercury"},{"name":"Hora 14","start":"19:27","end":"20:27","startHours":19.446449993779133,"endHours":20.446449993779133,"planetary_lord":"Venus"},{"name":"Hora 15","start":"20:27","end":"21:27","startHours":20.446449993779133,"endHours":21.446449993779133,"planetary_lord":"Sun"},{"name":"Hora 16","start":"21:27","end":"22:27","startHours":21.446449993779133,"endHours":22.446449993779133,"planetary_lord":"Mars"},{"name":"Hora 17","start":"22:27","end":"23:27","startHours":22.446449993779133,"endHours":23.446449993779133,"planetary_lord":"Jupiter"},{"name":"Hora 18","start":"23:27","end":"00:27","startHours":23.446449993779133,"endHours":24.446449993779133,"planetary_lord":"Saturn"},{"name":"Hora 19","start":"00:27","end":"01:27","startHours":24.446449993779133,"endHours":25.446449993779133,"planetary_lord":"Moon"},{"name":"Hora 20","start":"01:27","end":"02:27","startHours":25.446449993779133,"endHours":26.446449993779133,"planetary_lord":"Mercury"},{"name":"Hora 21","start":"02:27","end":"03:27","startHours":26.446449993779133,"endHours":27.446449993779133,"planetary_lord":"Venus"},{"name":"Hora 22","start":"03:27","end":"04:27","startHours":27.446449993779133,"endHours":28.446449993779133,"planetary_lord":"Sun"},{"name":"Hora 23","start":"04:27","end":"05:27","startHours":28.446449993779133,"endHours":29.446449993779133,"planetary_lord":"Mars"},{"name":"Hora 24","start":"05:27","end":"06:27","startHours":29.446449993779133,"endHours":30.446449993779133,"planetary_lord":"Jupiter"}],"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":["Meṣa","Vṛṣabha","Siṃha","Kanyā","Vṛścika","Makara"],"unfavorable_rashis":["Mithuna","Karka","Tulā","Dhanu","Kumbha","Mīna"]},"dishaShool":"West (Paścim)","chandraVasa":"North-East","rahuVasa":"North-East","anandadiYoga":{"name":"Mṛtyu","quality":"Inauspicious"},"drikRitu":"Varṣā (Monsoon) (Drik)","vedicRitu":"Varṣā (Monsoon)","drikAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":6.536030468598995,"eotMinutes":2.2010077150405363,"ayanamsa":23.5971}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Bhādrapada","lunar_month_paksha_full":"Bhādrapada Śukla Pakṣa","solar_month":"Siṃha (Āvaṇi)","ritu":"Varṣā (Monsoon)","display_summary":"Bhādrapada Śukla Aṣṭamī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[{"id":"radhashtami","name":"Rādhāṣṭamī","name_sanskrit":"राधाष्टमी","tradition":"Vaishnava","associated_deity":"Śrī Rādhā (Krishna's hlādinī-śakti)","significance":"Manifestation of Śrī Rādhā at Barsānā — Krishna's ādi-śakti.","vrata":true,"detection":{"tithi_number":8,"tithi_paksha":"Śukla","lunar_month":"Bhādrapada"},"precedence":2,"sources":["Padma Purāṇa","Brahma-Vaivarta Purāṇa"]},{"id":"simha-sankranti","name":"Siṁha Saṅkrānti","name_sanskrit":"सिंह सङ्क्रान्ति","tradition":"Pan-Hindu","significance":"Sun enters Leo.","vrata":false,"detection":{"sun_rashi":"Siṃha"},"precedence":5}],"todays_walk":{"walk":{"id":"surya-walk","name":"Sūrya Walk","name_sanskrit":"सूर्य यात्रा","type":"graha","description":"Self-illumination + BG 4.1 (Sun-lineage of Gītā transmission).","step_count":6,"url":"/walk/surya-walk"},"reason":"Ravivāra (Sunday) — its presiding graha's walk."},"cosmic_resonances":[{"historical_date":"-3137-12-25","event":"Bhīṣma's Mahaprasthan","chart_id":"bhishma","shared_marker":"same Śukla Aṣṭamī","url":"/day/-3137-12-25","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 September 6, 1981 CE · Perth, Australia · Vidhyamitra","description":"September 6, 1981 CE for Perth, Australia: Śukla Aṣṭamī, sūryodaya 06:27, sūryāsta 18:02.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1981-09-06","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1981-09-06","sa":"https://sa.vidhyamitra.com/city/perth/1981-09-06","hi":"https://hi.vidhyamitra.com/city/perth/1981-09-06","x-default":"https://vidhyamitra.com/city/perth/1981-09-06"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-18T13:49:42.747Z","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":"2026-05-18T13:49:42.747Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-18T13:49:42.747Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}