{"id":"vidhyamitra:city-day:perth:1931-07-13:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1931-07-13","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1931-07-13","date_display":"July 13, 1931 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":1931,"month":7,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2426535.770833,"kali_year":5033,"ahargana":1838070.2708,"sun":{"sidereal_longitude":86.5452,"rashi":3,"rashi_name":"Mithuna"},"moon":{"sidereal_longitude":54.5772,"rashi":2,"rashi_name":"Vṛṣabha"},"tithi":{"number":28,"name":"Trayodaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Trayodaśī","elongation_degrees":328.032,"elapsed_within_tithi_degrees":4.032},"nakshatra":{"number":5,"name":"Mṛgaśīrṣā","pada":1,"moon_longitude":54.5772,"elapsed_within_degrees":1.2439},"yoga":{"number":11,"name":"Vṛddhi","sum_longitude":141.1225},"karana":{"half_tithi_index":54,"name":"Gara"},"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":1931,"month":7,"day":13,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2426535.770833,"ahargana":1838070.2708,"kali_year":5033,"ayanamsa_lahiri":22.8965,"grahas":{"sun":{"sidereal_longitude":86.79744700000003,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":7,"name":"Punarvasu","pada":3},"retrograde":false},"moon":{"sidereal_longitude":55.036647000000016,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":5,"name":"Mr̥gaśirā","pada":1},"retrograde":false,"latitude":4.057},"mars":{"sidereal_longitude":146.25394700000004,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":102.279247,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":3},"retrograde":false},"jupiter":{"sidereal_longitude":96.77624700000001,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":8,"name":"Puṣya","pada":2},"retrograde":false},"venus":{"sidereal_longitude":72.22684700000002,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":6,"name":"Ārdrā","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":267.518547,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":1},"retrograde":true},"rahu":{"sidereal_longitude":350.1916,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":170.1916,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","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":1931,"month":7,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2426535.770833,"kali_year":5033,"ahargana":1838070.2708,"sun":{"sidereal_longitude":86.5452,"rashi":3,"rashi_name":"Mithuna"},"moon":{"sidereal_longitude":54.5772,"rashi":2,"rashi_name":"Vṛṣabha"},"tithi":{"number":28,"name":"Trayodaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Trayodaśī","elongation_degrees":328.032,"elapsed_within_tithi_degrees":4.032},"nakshatra":{"number":5,"name":"Mṛgaśīrṣā","pada":1,"moon_longitude":54.5772,"elapsed_within_degrees":1.2439},"yoga":{"number":11,"name":"Vṛddhi","sum_longitude":141.1225},"karana":{"half_tithi_index":54,"name":"Gara"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":4.057,"elongation":31.968},"lunar":{"type":"lunar","occurs":false,"moon_latitude":4.057,"opposition_distance":148.032}},"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":"07:16","sunsetLocal":"17:28","solarNoonLocal":"12:22","dayLengthHours":10.200423006927727,"dayLengthDisplay":"10 Hours 12 Mins 02 Secs","nightLengthDisplay":"13 Hours 47 Mins 58 Secs","moonriseLocal":"05:13","moonsetLocal":"15:17","rahuKala":{"name":"Rāhu Kāla","start":"08:32","end":"09:49","startHours":8.54016518650478,"endHours":9.815218062370747,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"11:05","end":"12:22","startHours":11.090270938236712,"endHours":12.365323814102677,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"13:38","end":"14:55","startHours":13.640376689968644,"endHours":14.915429565834609,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:39","end":"09:59","startHours":9.645211012255285,"endHours":9.985225112486209,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:41","end":"07:58","startHours":7.6901299359274695,"endHours":7.962141216112209,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:02","end":"12:42","startHours":12.025309713871753,"endHours":12.705337914333601,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:54","end":"06:35","startHours":5.905055909715117,"endHours":6.585084110176966,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"06:25","end":"07:16","startHours":6.415077060061504,"endHours":7.2651123106388145,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:04","end":"14:45","startHours":14.065394315257299,"endHours":14.745422515719147,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:16","end":"17:40","startHours":17.265535317566542,"endHours":17.66553531756654,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:28","end":"17:53","startHours":17.46553531756654,"endHours":17.890552942855198,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:13","end":"18:58","startHours":17.21553531756654,"endHours":18.96553531756654,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:02","end":"00:42","startHours":24.025309713871753,"endHours":24.7053379143336,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Amṛta","start":"07:16","end":"08:32","startHours":7.2651123106388145,"endHours":8.54016518650478,"quality":"auspicious"},{"name":"Kāla","start":"08:32","end":"09:49","startHours":8.54016518650478,"endHours":9.815218062370747,"quality":"inauspicious"},{"name":"Śubha","start":"09:49","end":"11:05","startHours":9.815218062370747,"endHours":11.090270938236712,"quality":"auspicious"},{"name":"Roga","start":"11:05","end":"12:22","startHours":11.090270938236712,"endHours":12.365323814102677,"quality":"inauspicious"},{"name":"Udveg","start":"12:22","end":"13:38","startHours":12.365323814102677,"endHours":13.640376689968644,"quality":"inauspicious"},{"name":"Chala","start":"13:38","end":"14:55","startHours":13.640376689968644,"endHours":14.915429565834609,"quality":"neutral"},{"name":"Labha","start":"14:55","end":"16:11","startHours":14.915429565834609,"endHours":16.190482441700574,"quality":"auspicious"},{"name":"Amṛta","start":"16:11","end":"17:28","startHours":16.190482441700574,"endHours":17.46553531756654,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Chala","start":"17:28","end":"19:11","startHours":17.46553531756654,"endHours":19.190482441700574,"quality":"neutral"},{"name":"Labha","start":"19:11","end":"20:55","startHours":19.190482441700574,"endHours":20.91542956583461,"quality":"auspicious"},{"name":"Amṛta","start":"20:55","end":"22:38","startHours":20.91542956583461,"endHours":22.640376689968644,"quality":"auspicious"},{"name":"Kāla","start":"22:38","end":"00:22","startHours":22.640376689968644,"endHours":24.365323814102677,"quality":"inauspicious"},{"name":"Śubha","start":"00:22","end":"02:05","startHours":24.365323814102677,"endHours":26.090270938236714,"quality":"auspicious"},{"name":"Roga","start":"02:05","end":"03:49","startHours":26.090270938236714,"endHours":27.815218062370747,"quality":"inauspicious"},{"name":"Udveg","start":"03:49","end":"05:32","startHours":27.815218062370747,"endHours":29.54016518650478,"quality":"inauspicious"},{"name":"Chala","start":"05:32","end":"07:16","startHours":29.54016518650478,"endHours":31.265112310638813,"quality":"neutral"}],"horas":[{"name":"Hora 1","start":"07:16","end":"08:16","startHours":7.2651123106388145,"endHours":8.265112310638814,"planetary_lord":"Moon"},{"name":"Hora 2","start":"08:16","end":"09:16","startHours":8.265112310638814,"endHours":9.265112310638814,"planetary_lord":"Mercury"},{"name":"Hora 3","start":"09:16","end":"10:16","startHours":9.265112310638814,"endHours":10.265112310638814,"planetary_lord":"Venus"},{"name":"Hora 4","start":"10:16","end":"11:16","startHours":10.265112310638814,"endHours":11.265112310638814,"planetary_lord":"Sun"},{"name":"Hora 5","start":"11:16","end":"12:16","startHours":11.265112310638814,"endHours":12.265112310638814,"planetary_lord":"Mars"},{"name":"Hora 6","start":"12:16","end":"13:16","startHours":12.265112310638814,"endHours":13.265112310638814,"planetary_lord":"Jupiter"},{"name":"Hora 7","start":"13:16","end":"14:16","startHours":13.265112310638814,"endHours":14.265112310638814,"planetary_lord":"Saturn"},{"name":"Hora 8","start":"14:16","end":"15:16","startHours":14.265112310638814,"endHours":15.265112310638814,"planetary_lord":"Moon"},{"name":"Hora 9","start":"15:16","end":"16:16","startHours":15.265112310638814,"endHours":16.265112310638813,"planetary_lord":"Mercury"},{"name":"Hora 10","start":"16:16","end":"17:16","startHours":16.265112310638813,"endHours":17.265112310638813,"planetary_lord":"Venus"},{"name":"Hora 11","start":"17:16","end":"18:16","startHours":17.265112310638813,"endHours":18.265112310638813,"planetary_lord":"Sun"},{"name":"Hora 12","start":"18:16","end":"19:16","startHours":18.265112310638813,"endHours":19.265112310638813,"planetary_lord":"Mars"},{"name":"Hora 13","start":"19:16","end":"20:16","startHours":19.265112310638813,"endHours":20.265112310638813,"planetary_lord":"Jupiter"},{"name":"Hora 14","start":"20:16","end":"21:16","startHours":20.265112310638813,"endHours":21.265112310638813,"planetary_lord":"Saturn"},{"name":"Hora 15","start":"21:16","end":"22:16","startHours":21.265112310638813,"endHours":22.265112310638813,"planetary_lord":"Moon"},{"name":"Hora 16","start":"22:16","end":"23:16","startHours":22.265112310638813,"endHours":23.265112310638813,"planetary_lord":"Mercury"},{"name":"Hora 17","start":"23:16","end":"00:16","startHours":23.265112310638813,"endHours":24.265112310638813,"planetary_lord":"Venus"},{"name":"Hora 18","start":"00:16","end":"01:16","startHours":24.265112310638813,"endHours":25.265112310638813,"planetary_lord":"Sun"},{"name":"Hora 19","start":"01:16","end":"02:16","startHours":25.265112310638813,"endHours":26.265112310638813,"planetary_lord":"Mars"},{"name":"Hora 20","start":"02:16","end":"03:16","startHours":26.265112310638813,"endHours":27.265112310638813,"planetary_lord":"Jupiter"},{"name":"Hora 21","start":"03:16","end":"04:16","startHours":27.265112310638813,"endHours":28.265112310638813,"planetary_lord":"Saturn"},{"name":"Hora 22","start":"04:16","end":"05:16","startHours":28.265112310638813,"endHours":29.265112310638813,"planetary_lord":"Moon"},{"name":"Hora 23","start":"05:16","end":"06:16","startHours":29.265112310638813,"endHours":30.265112310638813,"planetary_lord":"Mercury"},{"name":"Hora 24","start":"06:16","end":"07:16","startHours":30.265112310638813,"endHours":31.265112310638813,"planetary_lord":"Venus"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Ārdrā","Punarvasu","Puṣya","Aśleṣā","Maghā","Svātī","Viśākhā","Anurādhā","Jyeṣṭhā","Mūla","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Bharaṇī","Kṛttikā","Rohiṇī","Mṛgaśirā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Citrā","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Vṛṣabha","Karka","Tulā","Vṛścika","Kumbha","Mīna"],"unfavorable_rashis":["Meṣa","Mithuna","Siṃha","Kanyā","Dhanu","Makara"]},"dishaShool":"East (Pūrva)","chandraVasa":"South-East","rahuVasa":"North-East","anandadiYoga":{"name":"Vajra","quality":"Inauspicious"},"tropicalRitu":"Grīṣma (Summer) (tropical)","vedicRitu":"Grīṣma (Summer)","tropicalAyana":"Dakṣiṇāyana","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":21.99140856074837,"eotMinutes":-5.361428846160681,"ayanamsa":22.8965}},"calendars":{"vikram_samvat":1988,"vikram_samvatsara":"Tāraṇa","saka_samvat":1853,"saka_samvatsara":"Prajāpati","bengali_samvat":1338,"malayalam_era":1107,"nanakshahi_year":462,"lunar_month":"Āṣāḍha","lunar_month_paksha_full":"Āṣāḍha (Adhika) Kṛṣṇa Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Āṣāḍha","lunar_month_amanta":"Āṣāḍha","lunar_month_is_adhika":true,"lunar_month_purnimanta_is_adhika":true,"lunar_month_amanta_is_adhika":true,"solar_month":"Mithuna (Āni)","ritu":"Grīṣma (Summer)","display_summary":"Āṣāḍha (Adhika) Kṛṣṇa Trayodaśī · Vikram 1988 Tāraṇa · Śaka 1853 Prajāpati"},"festivals":[{"id":"pradosha-vrata","name":"Pradoṣa Vrata","name_sanskrit":"प्रदोष व्रत","tradition":"Shaiva","associated_deity":"Śiva","significance":"Twilight worship of Śiva on Trayodaśī.","vrata":true,"detection":{"any_of":[{"tithi_number":13},{"tithi_number":28}]},"precedence":7}],"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 July 13, 1931 CE · Perth, Australia · Vidhyamitra","description":"July 13, 1931 CE for Perth, Australia: Kṛṣṇa Trayodaśī, sūryodaya 07:16, sūryāsta 17:28.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1931-07-13","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1931-07-13","sa":"https://sa.vidhyamitra.com/city/perth/1931-07-13","hi":"https://hi.vidhyamitra.com/city/perth/1931-07-13","x-default":"https://vidhyamitra.com/city/perth/1931-07-13"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-01T21:55:40.661Z","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":"2026-06-01T21:55:40.661Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-01T21:55:40.661Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}