{"id":"vidhyamitra:city-day:perth:2013-08-18:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/2013-08-18","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"2013-08-18","date_display":"August 18, 2013 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":2013,"month":8,"day":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2456522.770833,"kali_year":5115,"ahargana":1868057.2708,"sun":{"sidereal_longitude":120.5715,"rashi":5,"rashi_name":"Siṃha"},"moon":{"sidereal_longitude":260.9904,"rashi":9,"rashi_name":"Dhanu"},"tithi":{"number":12,"name":"Dvādaśī","paksha":"Śukla","full_name":"Śukla Dvādaśī","elongation_degrees":140.4189,"elapsed_within_tithi_degrees":8.4189},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":3,"moon_longitude":260.9904,"elapsed_within_degrees":7.6571},"yoga":{"number":2,"name":"Prīti","sum_longitude":21.562},"karana":{"half_tithi_index":23,"name":"Bālava"},"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":2013,"month":8,"day":18,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2456522.770833,"ahargana":1868057.2708,"kali_year":5115,"ayanamsa_lahiri":24.0434,"grahas":{"sun":{"sidereal_longitude":121.232123,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":1},"retrograde":false},"moon":{"sidereal_longitude":259.184523,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":2},"retrograde":false,"latitude":3.8824},"mars":{"sidereal_longitude":89.31542300000001,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":7,"name":"Punarvasu","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":113.919623,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Aśleṣā","pada":3},"retrograde":false},"jupiter":{"sidereal_longitude":76.85972300000003,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":6,"name":"Ārdrā","pada":4},"retrograde":false},"venus":{"sidereal_longitude":157.41992300000004,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":4},"retrograde":false},"saturn":{"sidereal_longitude":191.84572300000002,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":15,"name":"Svātī","pada":2},"retrograde":false},"rahu":{"sidereal_longitude":201.3361,"rashi":{"number":7,"name":"Tulā"},"nakshatra":{"number":16,"name":"Viśākhā","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":21.3361,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":2,"name":"Bharaṇī","pada":3},"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":2013,"month":8,"day":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2456522.770833,"kali_year":5115,"ahargana":1868057.2708,"sun":{"sidereal_longitude":120.5715,"rashi":5,"rashi_name":"Siṃha"},"moon":{"sidereal_longitude":260.9904,"rashi":9,"rashi_name":"Dhanu"},"tithi":{"number":12,"name":"Dvādaśī","paksha":"Śukla","full_name":"Śukla Dvādaśī","elongation_degrees":140.4189,"elapsed_within_tithi_degrees":8.4189},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":3,"moon_longitude":260.9904,"elapsed_within_degrees":7.6571},"yoga":{"number":2,"name":"Prīti","sum_longitude":21.562},"karana":{"half_tithi_index":23,"name":"Bālava"},"vara":{"number":2,"name":"Ravivāra (Sunday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":3.882,"elongation":140.419},"lunar":{"type":"lunar","occurs":false,"moon_latitude":3.882,"opposition_distance":39.581}},"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":"06:49","sunsetLocal":"17:51","solarNoonLocal":"12:20","dayLengthHours":11.02346824926005,"dayLengthDisplay":"11 Hours 01 Mins 24 Secs","nightLengthDisplay":"12 Hours 58 Mins 36 Secs","moonriseLocal":"14:28","moonsetLocal":"04:36","rahuKala":{"name":"Rāhu Kāla","start":"16:28","end":"17:51","startHours":16.468568222154357,"endHours":17.846501753311863,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"12:20","end":"13:43","startHours":12.334767628681838,"endHours":13.712701159839344,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"15:05","end":"16:28","startHours":15.09063469099685,"endHours":16.468568222154357,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:24","end":"09:46","startHours":9.395176095545825,"endHours":9.762625037187826,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:17","end":"07:35","startHours":7.282344681104314,"endHours":7.576303834417915,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:58","end":"12:42","startHours":11.967318687039837,"endHours":12.70221657032384,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:21","end":"06:05","startHours":5.353237737483806,"endHours":6.088135620767809,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:54","end":"06:49","startHours":5.904411149946808,"endHours":6.823033504051812,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:10","end":"14:54","startHours":14.172012336891846,"endHours":14.906910220175849,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:39","end":"18:03","startHours":17.646501753311863,"endHours":18.046501753311862,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:51","end":"18:18","startHours":17.846501753311863,"endHours":18.305812930364365,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:36","end":"19:21","startHours":17.596501753311863,"endHours":19.346501753311863,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:58","end":"00:42","startHours":23.967318687039835,"endHours":24.70221657032384,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Udveg","start":"06:49","end":"08:12","startHours":6.823033504051812,"endHours":8.200967035209318,"quality":"inauspicious"},{"name":"Chala","start":"08:12","end":"09:35","startHours":8.200967035209318,"endHours":9.578900566366825,"quality":"neutral"},{"name":"Labha","start":"09:35","end":"10:57","startHours":9.578900566366825,"endHours":10.956834097524332,"quality":"auspicious"},{"name":"Amṛta","start":"10:57","end":"12:20","startHours":10.956834097524332,"endHours":12.334767628681838,"quality":"auspicious"},{"name":"Kāla","start":"12:20","end":"13:43","startHours":12.334767628681838,"endHours":13.712701159839344,"quality":"inauspicious"},{"name":"Śubha","start":"13:43","end":"15:05","startHours":13.712701159839344,"endHours":15.09063469099685,"quality":"auspicious"},{"name":"Roga","start":"15:05","end":"16:28","startHours":15.09063469099685,"endHours":16.468568222154357,"quality":"inauspicious"},{"name":"Udveg","start":"16:28","end":"17:51","startHours":16.468568222154357,"endHours":17.846501753311863,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Śubha","start":"17:51","end":"19:28","startHours":17.846501753311863,"endHours":19.468568222154357,"quality":"auspicious"},{"name":"Roga","start":"19:28","end":"21:05","startHours":19.468568222154357,"endHours":21.09063469099685,"quality":"inauspicious"},{"name":"Udveg","start":"21:05","end":"22:43","startHours":21.09063469099685,"endHours":22.712701159839344,"quality":"inauspicious"},{"name":"Chala","start":"22:43","end":"00:20","startHours":22.712701159839344,"endHours":24.33476762868184,"quality":"neutral"},{"name":"Labha","start":"00:20","end":"01:57","startHours":24.33476762868184,"endHours":25.95683409752433,"quality":"auspicious"},{"name":"Amṛta","start":"01:57","end":"03:35","startHours":25.95683409752433,"endHours":27.578900566366826,"quality":"auspicious"},{"name":"Kāla","start":"03:35","end":"05:12","startHours":27.578900566366826,"endHours":29.200967035209317,"quality":"inauspicious"},{"name":"Śubha","start":"05:12","end":"06:49","startHours":29.200967035209317,"endHours":30.823033504051814,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"06:49","end":"07:49","startHours":6.823033504051812,"endHours":7.823033504051812,"planetary_lord":"Sun"},{"name":"Hora 2","start":"07:49","end":"08:49","startHours":7.823033504051812,"endHours":8.823033504051812,"planetary_lord":"Mars"},{"name":"Hora 3","start":"08:49","end":"09:49","startHours":8.823033504051812,"endHours":9.823033504051812,"planetary_lord":"Jupiter"},{"name":"Hora 4","start":"09:49","end":"10:49","startHours":9.823033504051812,"endHours":10.823033504051812,"planetary_lord":"Saturn"},{"name":"Hora 5","start":"10:49","end":"11:49","startHours":10.823033504051812,"endHours":11.823033504051812,"planetary_lord":"Moon"},{"name":"Hora 6","start":"11:49","end":"12:49","startHours":11.823033504051812,"endHours":12.823033504051812,"planetary_lord":"Mercury"},{"name":"Hora 7","start":"12:49","end":"13:49","startHours":12.823033504051812,"endHours":13.823033504051812,"planetary_lord":"Venus"},{"name":"Hora 8","start":"13:49","end":"14:49","startHours":13.823033504051812,"endHours":14.823033504051812,"planetary_lord":"Sun"},{"name":"Hora 9","start":"14:49","end":"15:49","startHours":14.823033504051812,"endHours":15.823033504051812,"planetary_lord":"Mars"},{"name":"Hora 10","start":"15:49","end":"16:49","startHours":15.823033504051812,"endHours":16.823033504051814,"planetary_lord":"Jupiter"},{"name":"Hora 11","start":"16:49","end":"17:49","startHours":16.823033504051814,"endHours":17.823033504051814,"planetary_lord":"Saturn"},{"name":"Hora 12","start":"17:49","end":"18:49","startHours":17.823033504051814,"endHours":18.823033504051814,"planetary_lord":"Moon"},{"name":"Hora 13","start":"18:49","end":"19:49","startHours":18.823033504051814,"endHours":19.823033504051814,"planetary_lord":"Mercury"},{"name":"Hora 14","start":"19:49","end":"20:49","startHours":19.823033504051814,"endHours":20.823033504051814,"planetary_lord":"Venus"},{"name":"Hora 15","start":"20:49","end":"21:49","startHours":20.823033504051814,"endHours":21.823033504051814,"planetary_lord":"Sun"},{"name":"Hora 16","start":"21:49","end":"22:49","startHours":21.823033504051814,"endHours":22.823033504051814,"planetary_lord":"Mars"},{"name":"Hora 17","start":"22:49","end":"23:49","startHours":22.823033504051814,"endHours":23.823033504051814,"planetary_lord":"Jupiter"},{"name":"Hora 18","start":"23:49","end":"00:49","startHours":23.823033504051814,"endHours":24.823033504051814,"planetary_lord":"Saturn"},{"name":"Hora 19","start":"00:49","end":"01:49","startHours":24.823033504051814,"endHours":25.823033504051814,"planetary_lord":"Moon"},{"name":"Hora 20","start":"01:49","end":"02:49","startHours":25.823033504051814,"endHours":26.823033504051814,"planetary_lord":"Mercury"},{"name":"Hora 21","start":"02:49","end":"03:49","startHours":26.823033504051814,"endHours":27.823033504051814,"planetary_lord":"Venus"},{"name":"Hora 22","start":"03:49","end":"04:49","startHours":27.823033504051814,"endHours":28.823033504051814,"planetary_lord":"Sun"},{"name":"Hora 23","start":"04:49","end":"05:49","startHours":28.823033504051814,"endHours":29.823033504051814,"planetary_lord":"Mars"},{"name":"Hora 24","start":"05:49","end":"06:49","startHours":29.823033504051814,"endHours":30.823033504051814,"planetary_lord":"Jupiter"}],"taraBala":{"favorable_nakshatras":["Kṛttikā","Rohiṇī","Mṛgaśirā","Ārdrā","Punarvasu","Uttara Phalgunī","Hasta","Citrā","Svātī","Viśākhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā"],"unfavorable_nakshatras":["Aśvinī","Bharaṇī","Puṣya","Aśleṣā","Maghā","Pūrva Phalgunī","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","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":"Śubha","quality":"Auspicious"},"tropicalRitu":"Varṣā (Monsoon)","vedicRitu":"Varṣā (Monsoon)","tropicalAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":13.094665112544744,"eotMinutes":-3.5280577209103767,"ayanamsa":24.0434}},"calendars":{"vikram_samvat":2070,"vikram_samvatsara":"Parābhava","saka_samvat":1935,"saka_samvatsara":"Vijaya","bengali_samvat":1420,"malayalam_era":1189,"nanakshahi_year":544,"lunar_month":"Śrāvaṇa","lunar_month_paksha_full":"Śrāvaṇa Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Śrāvaṇa","lunar_month_amanta":"Śrāvaṇa","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Siṃha (Āvaṇi)","ritu":"Varṣā (Monsoon)","display_summary":"Śrāvaṇa Śukla Dvādaśī · Vikram 2070 Parābhava · Śaka 1935 Vijaya"},"festivals":[],"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 August 18, 2013 CE · Perth, Australia · Vidhyamitra","description":"August 18, 2013 CE for Perth, Australia: Śukla Dvādaśī, sūryodaya 06:49, sūryāsta 17:51.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/2013-08-18","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/2013-08-18","sa":"https://sa.vidhyamitra.com/city/perth/2013-08-18","hi":"https://hi.vidhyamitra.com/city/perth/2013-08-18","x-default":"https://vidhyamitra.com/city/perth/2013-08-18"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-31T19:58:22.407Z","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":"2026-05-31T19:58:22.407Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-31T19:58:22.407Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}