{"id":"vidhyamitra:city-day:perth:1817-02-13:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1817-02-13","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1817-02-13","date_display":"February 13, 1817 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":1817,"month":2,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2384748.770833,"kali_year":4918,"ahargana":1796283.2708,"sun":{"sidereal_longitude":303.2728,"rashi":11,"rashi_name":"Kumbha"},"moon":{"sidereal_longitude":266.0941,"rashi":9,"rashi_name":"Dhanu"},"tithi":{"number":27,"name":"Dvādaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Dvādaśī","elongation_degrees":322.8213,"elapsed_within_tithi_degrees":10.8213},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":4,"moon_longitude":266.0941,"elapsed_within_degrees":12.7607},"yoga":{"number":16,"name":"Siddhi","sum_longitude":209.3668},"karana":{"half_tithi_index":53,"name":"Taitila"},"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":1817,"month":2,"day":13,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2384748.770833,"ahargana":1796283.2708,"kali_year":4918,"ayanamsa_lahiri":21.2983,"grahas":{"sun":{"sidereal_longitude":302.74681699999996,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":3},"retrograde":false},"moon":{"sidereal_longitude":265.417017,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":4},"retrograde":false,"latitude":-2.9992},"mars":{"sidereal_longitude":265.808817,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":296.984017,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":2},"retrograde":true},"jupiter":{"sidereal_longitude":229.084517,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":18,"name":"Jyeṣṭhā","pada":1},"retrograde":false},"venus":{"sidereal_longitude":349.700917,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":1},"retrograde":false},"saturn":{"sidereal_longitude":306.69481700000006,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":1},"retrograde":false},"rahu":{"sidereal_longitude":44.268,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":224.268,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","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":1817,"month":2,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2384748.770833,"kali_year":4918,"ahargana":1796283.2708,"sun":{"sidereal_longitude":303.2728,"rashi":11,"rashi_name":"Kumbha"},"moon":{"sidereal_longitude":266.0941,"rashi":9,"rashi_name":"Dhanu"},"tithi":{"number":27,"name":"Dvādaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Dvādaśī","elongation_degrees":322.8213,"elapsed_within_tithi_degrees":10.8213},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":4,"moon_longitude":266.0941,"elapsed_within_degrees":12.7607},"yoga":{"number":16,"name":"Siddhi","sum_longitude":209.3668},"karana":{"half_tithi_index":53,"name":"Taitila"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-2.999,"elongation":37.179},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-2.999,"opposition_distance":142.821}},"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":"05:53","sunsetLocal":"19:10","solarNoonLocal":"12:31","dayLengthHours":13.284941696805438,"dayLengthDisplay":"13 Hours 17 Mins 06 Secs","nightLengthDisplay":"10 Hours 42 Mins 54 Secs","moonriseLocal":"02:59","moonsetLocal":"17:04","rahuKala":{"name":"Rāhu Kāla","start":"14:11","end":"15:50","startHours":14.179909799777715,"endHours":15.840527511878394,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"05:53","end":"07:32","startHours":5.8768212392743155,"endHours":7.5374389513749955,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"09:12","end":"10:52","startHours":9.198056663475676,"endHours":10.858674375576355,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:59","end":"09:25","startHours":8.976640968528917,"endHours":9.419472358422432,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:26","end":"06:47","startHours":6.430360476641209,"endHours":6.78462558855602,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:05","end":"12:58","startHours":12.076460697783519,"endHours":12.962123477570549,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"04:06","end":"04:59","startHours":4.105495679700257,"endHours":4.991158459487286,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:46","end":"05:53","startHours":4.7697427645405295,"endHours":5.8768212392743155,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:44","end":"15:37","startHours":14.733449037144608,"endHours":15.619111816931637,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"18:58","end":"19:22","startHours":18.961762936079754,"endHours":19.361762936079753,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"19:10","end":"19:43","startHours":19.161762936079754,"endHours":19.71530217344665,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:55","end":"20:40","startHours":18.911762936079754,"endHours":20.661762936079754,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:05","end":"00:58","startHours":24.07646069778352,"endHours":24.962123477570547,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Śubha","start":"05:53","end":"07:32","startHours":5.8768212392743155,"endHours":7.5374389513749955,"quality":"auspicious"},{"name":"Roga","start":"07:32","end":"09:12","startHours":7.5374389513749955,"endHours":9.198056663475676,"quality":"inauspicious"},{"name":"Udveg","start":"09:12","end":"10:52","startHours":9.198056663475676,"endHours":10.858674375576355,"quality":"inauspicious"},{"name":"Chala","start":"10:52","end":"12:31","startHours":10.858674375576355,"endHours":12.519292087677034,"quality":"neutral"},{"name":"Labha","start":"12:31","end":"14:11","startHours":12.519292087677034,"endHours":14.179909799777715,"quality":"auspicious"},{"name":"Amṛta","start":"14:11","end":"15:50","startHours":14.179909799777715,"endHours":15.840527511878394,"quality":"auspicious"},{"name":"Kāla","start":"15:50","end":"17:30","startHours":15.840527511878394,"endHours":17.501145223979073,"quality":"inauspicious"},{"name":"Śubha","start":"17:30","end":"19:10","startHours":17.501145223979073,"endHours":19.161762936079754,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Amṛta","start":"19:10","end":"20:30","startHours":19.161762936079754,"endHours":20.501145223979073,"quality":"auspicious"},{"name":"Kāla","start":"20:30","end":"21:50","startHours":20.501145223979073,"endHours":21.840527511878395,"quality":"inauspicious"},{"name":"Śubha","start":"21:50","end":"23:11","startHours":21.840527511878395,"endHours":23.179909799777715,"quality":"auspicious"},{"name":"Roga","start":"23:11","end":"00:31","startHours":23.179909799777715,"endHours":24.519292087677034,"quality":"inauspicious"},{"name":"Udveg","start":"00:31","end":"01:52","startHours":24.519292087677034,"endHours":25.858674375576356,"quality":"inauspicious"},{"name":"Chala","start":"01:52","end":"03:12","startHours":25.858674375576356,"endHours":27.198056663475676,"quality":"neutral"},{"name":"Labha","start":"03:12","end":"04:32","startHours":27.198056663475676,"endHours":28.537438951374995,"quality":"auspicious"},{"name":"Amṛta","start":"04:32","end":"05:53","startHours":28.537438951374995,"endHours":29.876821239274314,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"05:53","end":"06:53","startHours":5.8768212392743155,"endHours":6.8768212392743155,"planetary_lord":"Jupiter"},{"name":"Hora 2","start":"06:53","end":"07:53","startHours":6.8768212392743155,"endHours":7.8768212392743155,"planetary_lord":"Saturn"},{"name":"Hora 3","start":"07:53","end":"08:53","startHours":7.8768212392743155,"endHours":8.876821239274316,"planetary_lord":"Moon"},{"name":"Hora 4","start":"08:53","end":"09:53","startHours":8.876821239274316,"endHours":9.876821239274316,"planetary_lord":"Mercury"},{"name":"Hora 5","start":"09:53","end":"10:53","startHours":9.876821239274316,"endHours":10.876821239274316,"planetary_lord":"Venus"},{"name":"Hora 6","start":"10:53","end":"11:53","startHours":10.876821239274316,"endHours":11.876821239274316,"planetary_lord":"Sun"},{"name":"Hora 7","start":"11:53","end":"12:53","startHours":11.876821239274316,"endHours":12.876821239274316,"planetary_lord":"Mars"},{"name":"Hora 8","start":"12:53","end":"13:53","startHours":12.876821239274316,"endHours":13.876821239274316,"planetary_lord":"Jupiter"},{"name":"Hora 9","start":"13:53","end":"14:53","startHours":13.876821239274316,"endHours":14.876821239274316,"planetary_lord":"Saturn"},{"name":"Hora 10","start":"14:53","end":"15:53","startHours":14.876821239274316,"endHours":15.876821239274316,"planetary_lord":"Moon"},{"name":"Hora 11","start":"15:53","end":"16:53","startHours":15.876821239274316,"endHours":16.876821239274314,"planetary_lord":"Mercury"},{"name":"Hora 12","start":"16:53","end":"17:53","startHours":16.876821239274314,"endHours":17.876821239274314,"planetary_lord":"Venus"},{"name":"Hora 13","start":"17:53","end":"18:53","startHours":17.876821239274314,"endHours":18.876821239274314,"planetary_lord":"Sun"},{"name":"Hora 14","start":"18:53","end":"19:53","startHours":18.876821239274314,"endHours":19.876821239274314,"planetary_lord":"Mars"},{"name":"Hora 15","start":"19:53","end":"20:53","startHours":19.876821239274314,"endHours":20.876821239274314,"planetary_lord":"Jupiter"},{"name":"Hora 16","start":"20:53","end":"21:53","startHours":20.876821239274314,"endHours":21.876821239274314,"planetary_lord":"Saturn"},{"name":"Hora 17","start":"21:53","end":"22:53","startHours":21.876821239274314,"endHours":22.876821239274314,"planetary_lord":"Moon"},{"name":"Hora 18","start":"22:53","end":"23:53","startHours":22.876821239274314,"endHours":23.876821239274314,"planetary_lord":"Mercury"},{"name":"Hora 19","start":"23:53","end":"00:53","startHours":23.876821239274314,"endHours":24.876821239274314,"planetary_lord":"Venus"},{"name":"Hora 20","start":"00:53","end":"01:53","startHours":24.876821239274314,"endHours":25.876821239274314,"planetary_lord":"Sun"},{"name":"Hora 21","start":"01:53","end":"02:53","startHours":25.876821239274314,"endHours":26.876821239274314,"planetary_lord":"Mars"},{"name":"Hora 22","start":"02:53","end":"03:53","startHours":26.876821239274314,"endHours":27.876821239274314,"planetary_lord":"Jupiter"},{"name":"Hora 23","start":"03:53","end":"04:53","startHours":27.876821239274314,"endHours":28.876821239274314,"planetary_lord":"Saturn"},{"name":"Hora 24","start":"04:53","end":"05:53","startHours":28.876821239274314,"endHours":29.876821239274314,"planetary_lord":"Moon"}],"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":"South (Dakṣiṇa)","chandraVasa":"East","rahuVasa":"North-West","anandadiYoga":{"name":"Śrīvatsa","quality":"Auspicious"},"tropicalRitu":"Śiśira (Winter)","vedicRitu":"Śiśira (Winter)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-13.504859043487027,"eotMinutes":-14.599525260622107,"ayanamsa":21.2983}},"calendars":{"vikram_samvat":1874,"vikram_samvatsara":"Vikṛti","saka_samvat":1739,"saka_samvatsara":"Īśvara","bengali_samvat":1224,"malayalam_era":993,"nanakshahi_year":348,"lunar_month":"Phālguna","lunar_month_paksha_full":"Phālguna Kṛṣṇa Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Phālguna","lunar_month_amanta":"Māgha","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Kumbha (Māsi)","ritu":"Śiśira (Winter)","display_summary":"Phālguna Kṛṣṇa Dvādaśī · Vikram 1874 Vikṛti · Śaka 1739 Īśvara"},"festivals":[],"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 February 13, 1817 CE · Perth, Australia · Vidhyamitra","description":"February 13, 1817 CE for Perth, Australia: Kṛṣṇa Dvādaśī, sūryodaya 05:53, sūryāsta 19:10.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1817-02-13","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1817-02-13","sa":"https://sa.vidhyamitra.com/city/perth/1817-02-13","hi":"https://hi.vidhyamitra.com/city/perth/1817-02-13","x-default":"https://vidhyamitra.com/city/perth/1817-02-13"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-05T02:30:05.789Z","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":"2026-06-05T02:30:05.789Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-05T02:30:05.789Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}