{"id":"vidhyamitra:city-day:perth:2137-10-20:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/2137-10-20","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"2137-10-20","date_display":"October 20, 2137 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":2137,"month":10,"day":20,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2501875.770833,"kali_year":5239,"ahargana":1913410.2708,"sun":{"sidereal_longitude":179.9324,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":244.9967,"rashi":9,"rashi_name":"Dhanu"},"tithi":{"number":6,"name":"Ṣaṣṭhī","paksha":"Śukla","full_name":"Śukla Ṣaṣṭhī","elongation_degrees":65.0644,"elapsed_within_tithi_degrees":5.0644},"nakshatra":{"number":19,"name":"Mūla","pada":2,"moon_longitude":244.9967,"elapsed_within_degrees":4.9967},"yoga":{"number":5,"name":"Śobhana","sum_longitude":64.9291},"karana":{"half_tithi_index":10,"name":"Kaulava"},"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":2137,"month":10,"day":20,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2501875.770833,"ahargana":1913410.2708,"kali_year":5239,"ayanamsa_lahiri":25.778,"grahas":{"sun":{"sidereal_longitude":180.99470499999995,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":14,"name":"Citrā","pada":3},"retrograde":false},"moon":{"sidereal_longitude":247.298405,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":3},"retrograde":false,"latitude":-4.3103},"mars":{"sidereal_longitude":109.69600500000001,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Aśleṣā","pada":1},"retrograde":false},"mercury":{"sidereal_longitude":202.08260500000006,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":16,"name":"Viśākhā","pada":1},"retrograde":false},"jupiter":{"sidereal_longitude":219.09450500000003,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","pada":2},"retrograde":false},"venus":{"sidereal_longitude":168.14750500000002,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":261.503605,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":3},"retrograde":false},"rahu":{"sidereal_longitude":318.3159,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":4},"retrograde":false},"ketu":{"sidereal_longitude":138.3159,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","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":2137,"month":10,"day":20,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2501875.770833,"kali_year":5239,"ahargana":1913410.2708,"sun":{"sidereal_longitude":179.9324,"rashi":6,"rashi_name":"Kanyā"},"moon":{"sidereal_longitude":244.9967,"rashi":9,"rashi_name":"Dhanu"},"tithi":{"number":6,"name":"Ṣaṣṭhī","paksha":"Śukla","full_name":"Śukla Ṣaṣṭhī","elongation_degrees":65.0644,"elapsed_within_tithi_degrees":5.0644},"nakshatra":{"number":19,"name":"Mūla","pada":2,"moon_longitude":244.9967,"elapsed_within_degrees":4.9967},"yoga":{"number":5,"name":"Śobhana","sum_longitude":64.9291},"karana":{"half_tithi_index":10,"name":"Kaulava"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-4.31,"elongation":65.064},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-4.31,"opposition_distance":114.936}},"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":"18:31","solarNoonLocal":"12:01","dayLengthHours":13.003568680097139,"dayLengthDisplay":"13 Hours 00 Mins 13 Secs","nightLengthDisplay":"10 Hours 59 Mins 47 Secs","moonriseLocal":"09:20","moonsetLocal":"23:32","rahuKala":{"name":"Rāhu Kāla","start":"16:53","end":"18:31","startHours":16.890690400965905,"endHours":18.51613648597805,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"12:01","end":"13:38","startHours":12.014352145929479,"endHours":13.639798230941622,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"15:16","end":"16:53","startHours":15.265244315953765,"endHours":16.890690400965905,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:33","end":"08:59","startHours":8.54673383123691,"endHours":8.980186120573482,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:03","end":"06:24","startHours":6.054383167551625,"endHours":6.4011449990208815,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:35","end":"12:27","startHours":11.580899856592907,"endHours":12.44780443526605,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:47","end":"04:39","startHours":3.778758648534625,"endHours":4.645663227207768,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:26","end":"05:31","startHours":4.428937082539482,"endHours":5.51256780588091,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:11","end":"15:03","startHours":14.181613592612337,"endHours":15.04851817128548,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:19","end":"18:43","startHours":18.31613648597805,"endHours":18.716136485978048,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:31","end":"19:03","startHours":18.51613648597805,"endHours":19.057951847648763,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:16","end":"20:01","startHours":18.26613648597805,"endHours":20.01613648597805,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:35","end":"00:27","startHours":23.580899856592907,"endHours":24.44780443526605,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Udveg","start":"05:31","end":"07:08","startHours":5.51256780588091,"endHours":7.138013890893053,"quality":"inauspicious"},{"name":"Chala","start":"07:08","end":"08:46","startHours":7.138013890893053,"endHours":8.763459975905196,"quality":"neutral"},{"name":"Labha","start":"08:46","end":"10:23","startHours":8.763459975905196,"endHours":10.388906060917337,"quality":"auspicious"},{"name":"Amṛta","start":"10:23","end":"12:01","startHours":10.388906060917337,"endHours":12.014352145929479,"quality":"auspicious"},{"name":"Kāla","start":"12:01","end":"13:38","startHours":12.014352145929479,"endHours":13.639798230941622,"quality":"inauspicious"},{"name":"Śubha","start":"13:38","end":"15:16","startHours":13.639798230941622,"endHours":15.265244315953765,"quality":"auspicious"},{"name":"Roga","start":"15:16","end":"16:53","startHours":15.265244315953765,"endHours":16.890690400965905,"quality":"inauspicious"},{"name":"Udveg","start":"16:53","end":"18:31","startHours":16.890690400965905,"endHours":18.51613648597805,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Śubha","start":"18:31","end":"19:53","startHours":18.51613648597805,"endHours":19.890690400965905,"quality":"auspicious"},{"name":"Roga","start":"19:53","end":"21:16","startHours":19.890690400965905,"endHours":21.265244315953765,"quality":"inauspicious"},{"name":"Udveg","start":"21:16","end":"22:38","startHours":21.265244315953765,"endHours":22.639798230941622,"quality":"inauspicious"},{"name":"Chala","start":"22:38","end":"00:01","startHours":22.639798230941622,"endHours":24.01435214592948,"quality":"neutral"},{"name":"Labha","start":"00:01","end":"01:23","startHours":24.01435214592948,"endHours":25.388906060917336,"quality":"auspicious"},{"name":"Amṛta","start":"01:23","end":"02:46","startHours":25.388906060917336,"endHours":26.763459975905192,"quality":"auspicious"},{"name":"Kāla","start":"02:46","end":"04:08","startHours":26.763459975905192,"endHours":28.138013890893053,"quality":"inauspicious"},{"name":"Śubha","start":"04:08","end":"05:31","startHours":28.138013890893053,"endHours":29.51256780588091,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"05:31","end":"06:31","startHours":5.51256780588091,"endHours":6.51256780588091,"planetary_lord":"Sun"},{"name":"Hora 2","start":"06:31","end":"07:31","startHours":6.51256780588091,"endHours":7.51256780588091,"planetary_lord":"Mars"},{"name":"Hora 3","start":"07:31","end":"08:31","startHours":7.51256780588091,"endHours":8.51256780588091,"planetary_lord":"Jupiter"},{"name":"Hora 4","start":"08:31","end":"09:31","startHours":8.51256780588091,"endHours":9.51256780588091,"planetary_lord":"Saturn"},{"name":"Hora 5","start":"09:31","end":"10:31","startHours":9.51256780588091,"endHours":10.51256780588091,"planetary_lord":"Moon"},{"name":"Hora 6","start":"10:31","end":"11:31","startHours":10.51256780588091,"endHours":11.51256780588091,"planetary_lord":"Mercury"},{"name":"Hora 7","start":"11:31","end":"12:31","startHours":11.51256780588091,"endHours":12.51256780588091,"planetary_lord":"Venus"},{"name":"Hora 8","start":"12:31","end":"13:31","startHours":12.51256780588091,"endHours":13.51256780588091,"planetary_lord":"Sun"},{"name":"Hora 9","start":"13:31","end":"14:31","startHours":13.51256780588091,"endHours":14.51256780588091,"planetary_lord":"Mars"},{"name":"Hora 10","start":"14:31","end":"15:31","startHours":14.51256780588091,"endHours":15.51256780588091,"planetary_lord":"Jupiter"},{"name":"Hora 11","start":"15:31","end":"16:31","startHours":15.51256780588091,"endHours":16.51256780588091,"planetary_lord":"Saturn"},{"name":"Hora 12","start":"16:31","end":"17:31","startHours":16.51256780588091,"endHours":17.51256780588091,"planetary_lord":"Moon"},{"name":"Hora 13","start":"17:31","end":"18:31","startHours":17.51256780588091,"endHours":18.51256780588091,"planetary_lord":"Mercury"},{"name":"Hora 14","start":"18:31","end":"19:31","startHours":18.51256780588091,"endHours":19.51256780588091,"planetary_lord":"Venus"},{"name":"Hora 15","start":"19:31","end":"20:31","startHours":19.51256780588091,"endHours":20.51256780588091,"planetary_lord":"Sun"},{"name":"Hora 16","start":"20:31","end":"21:31","startHours":20.51256780588091,"endHours":21.51256780588091,"planetary_lord":"Mars"},{"name":"Hora 17","start":"21:31","end":"22:31","startHours":21.51256780588091,"endHours":22.51256780588091,"planetary_lord":"Jupiter"},{"name":"Hora 18","start":"22:31","end":"23:31","startHours":22.51256780588091,"endHours":23.51256780588091,"planetary_lord":"Saturn"},{"name":"Hora 19","start":"23:31","end":"00:31","startHours":23.51256780588091,"endHours":24.51256780588091,"planetary_lord":"Moon"},{"name":"Hora 20","start":"00:31","end":"01:31","startHours":24.51256780588091,"endHours":25.51256780588091,"planetary_lord":"Mercury"},{"name":"Hora 21","start":"01:31","end":"02:31","startHours":25.51256780588091,"endHours":26.51256780588091,"planetary_lord":"Venus"},{"name":"Hora 22","start":"02:31","end":"03:31","startHours":26.51256780588091,"endHours":27.51256780588091,"planetary_lord":"Sun"},{"name":"Hora 23","start":"03:31","end":"04:31","startHours":27.51256780588091,"endHours":28.51256780588091,"planetary_lord":"Mars"},{"name":"Hora 24","start":"04:31","end":"05:31","startHours":28.51256780588091,"endHours":29.51256780588091,"planetary_lord":"Jupiter"}],"taraBala":{"favorable_nakshatras":["Bharaṇī","Kṛttikā","Rohiṇī","Mṛgaśirā","Ārdrā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Citrā","Svātī","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj"],"unfavorable_nakshatras":["Aśvinī","Punarvasu","Puṣya","Aśleṣā","Maghā","Viśākhā","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Vṛṣabha","Mithuna","Kanyā","Tulā","Dhanu","Kumbha"],"unfavorable_rashis":["Meṣa","Karka","Siṃha","Vṛścika","Makara","Mīna"]},"dishaShool":"West (Paścim)","chandraVasa":"East","rahuVasa":"North-East","anandadiYoga":{"name":"Siddhi","quality":"Auspicious"},"tropicalRitu":"Śarad (Autumn)","vedicRitu":"Śarad (Autumn)","tropicalAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-10.320806373724764,"eotMinutes":15.696871244231174,"ayanamsa":25.778}},"calendars":{"vikram_samvat":2194,"vikram_samvatsara":"Sādhāraṇa","saka_samvat":2059,"saka_samvatsara":"Hemalambī","bengali_samvat":1544,"malayalam_era":1313,"nanakshahi_year":668,"lunar_month":"Āśvina","lunar_month_paksha_full":"Āśvina Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Āśvina","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":"Āśvina Śukla Ṣaṣṭhī · Vikram 2194 Sādhāraṇa · Śaka 2059 Hemalambī"},"festivals":[{"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}],"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":[]},"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, 2137 CE · Perth, Australia · Vidhyamitra","description":"October 20, 2137 CE for Perth, Australia: Śukla Ṣaṣṭhī, sūryodaya 05:31, sūryāsta 18:31.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/2137-10-20","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/2137-10-20","sa":"https://sa.vidhyamitra.com/city/perth/2137-10-20","hi":"https://hi.vidhyamitra.com/city/perth/2137-10-20","x-default":"https://vidhyamitra.com/city/perth/2137-10-20"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-31T11:40:00.723Z","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":"2026-05-31T11:40:00.723Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-31T11:40:00.723Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}