{"id":"vidhyamitra:city-day:perth:2027-01-13:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/2027-01-13","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"2027-01-13","date_display":"January 13, 2027 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":2027,"month":1,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2461418.770833,"kali_year":5128,"ahargana":1872953.2708,"sun":{"sidereal_longitude":268.175,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":328.8754,"rashi":11,"rashi_name":"Kumbha"},"tithi":{"number":6,"name":"Ṣaṣṭhī","paksha":"Śukla","full_name":"Śukla Ṣaṣṭhī","elongation_degrees":60.7004,"elapsed_within_tithi_degrees":0.7004},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":3,"moon_longitude":328.8754,"elapsed_within_degrees":8.8754},"yoga":{"number":18,"name":"Varīyān","sum_longitude":237.0504},"karana":{"half_tithi_index":10,"name":"Kaulava"},"vara":{"number":5,"name":"Budhavāra (Wednesday)"}},"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":2027,"month":1,"day":13,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2461418.770833,"ahargana":1872953.2708,"kali_year":5128,"ayanamsa_lahiri":24.2306,"grahas":{"sun":{"sidereal_longitude":268.37185999999997,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":1},"retrograde":false},"moon":{"sidereal_longitude":325.23656000000005,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":2},"retrograde":false,"latitude":2.038},"mars":{"sidereal_longitude":135.74796000000003,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":1},"retrograde":false},"mercury":{"sidereal_longitude":275.08475999999996,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":3},"retrograde":false},"jupiter":{"sidereal_longitude":121.04795999999999,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":1},"retrograde":true},"venus":{"sidereal_longitude":221.32556,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":344.73976,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":4},"retrograde":false},"rahu":{"sidereal_longitude":301.9224,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":3},"retrograde":false},"ketu":{"sidereal_longitude":121.9224,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":10,"name":"Maghā","pada":1},"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":2027,"month":1,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2461418.770833,"kali_year":5128,"ahargana":1872953.2708,"sun":{"sidereal_longitude":268.175,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":328.8754,"rashi":11,"rashi_name":"Kumbha"},"tithi":{"number":6,"name":"Ṣaṣṭhī","paksha":"Śukla","full_name":"Śukla Ṣaṣṭhī","elongation_degrees":60.7004,"elapsed_within_tithi_degrees":0.7004},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":3,"moon_longitude":328.8754,"elapsed_within_degrees":8.8754},"yoga":{"number":18,"name":"Varīyān","sum_longitude":237.0504},"karana":{"half_tithi_index":10,"name":"Kaulava"},"vara":{"number":5,"name":"Budhavāra (Wednesday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":2.038,"elongation":60.7},"lunar":{"type":"lunar","occurs":false,"moon_latitude":2.038,"opposition_distance":119.3}},"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":"05:24","sunsetLocal":"19:27","solarNoonLocal":"12:25","dayLengthHours":14.045909379384131,"dayLengthDisplay":"14 Hours 02 Mins 45 Secs","nightLengthDisplay":"9 Hours 57 Mins 15 Secs","moonriseLocal":"09:59","moonsetLocal":"22:26","rahuKala":{"name":"Rāhu Kāla","start":"12:25","end":"14:11","startHours":12.41989885818956,"endHours":14.175637530612576,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"07:09","end":"08:55","startHours":7.1526828409205105,"endHours":8.908421513343526,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"10:40","end":"12:25","startHours":10.664160185766544,"endHours":12.41989885818956,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:40","end":"09:09","startHours":8.674323023687124,"endHours":9.14252000299993,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"05:59","end":"06:21","startHours":5.9821903926385005,"endHours":6.356747976088744,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:57","end":"12:53","startHours":11.951701878876756,"endHours":12.888095837502364,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:31","end":"04:28","startHours":3.524156251246277,"endHours":4.460550209871886,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:14","end":"05:24","startHours":4.226451720215484,"endHours":5.396944168497495,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:46","end":"15:42","startHours":14.760883754753582,"endHours":15.69727771337919,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"19:15","end":"19:39","startHours":19.242853547881626,"endHours":19.642853547881625,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"19:27","end":"20:02","startHours":19.442853547881626,"endHours":20.02809977202263,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"19:12","end":"20:57","startHours":19.192853547881626,"endHours":20.942853547881626,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:57","end":"00:53","startHours":23.951701878876758,"endHours":24.888095837502366,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Labha","start":"05:24","end":"07:09","startHours":5.396944168497495,"endHours":7.1526828409205105,"quality":"auspicious"},{"name":"Amṛta","start":"07:09","end":"08:55","startHours":7.1526828409205105,"endHours":8.908421513343526,"quality":"auspicious"},{"name":"Kāla","start":"08:55","end":"10:40","startHours":8.908421513343526,"endHours":10.664160185766544,"quality":"inauspicious"},{"name":"Śubha","start":"10:40","end":"12:25","startHours":10.664160185766544,"endHours":12.41989885818956,"quality":"auspicious"},{"name":"Roga","start":"12:25","end":"14:11","startHours":12.41989885818956,"endHours":14.175637530612576,"quality":"inauspicious"},{"name":"Udveg","start":"14:11","end":"15:56","startHours":14.175637530612576,"endHours":15.931376203035594,"quality":"inauspicious"},{"name":"Chala","start":"15:56","end":"17:41","startHours":15.931376203035594,"endHours":17.68711487545861,"quality":"neutral"},{"name":"Labha","start":"17:41","end":"19:27","startHours":17.68711487545861,"endHours":19.442853547881626,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Udveg","start":"19:27","end":"20:41","startHours":19.442853547881626,"endHours":20.687114875458608,"quality":"inauspicious"},{"name":"Chala","start":"20:41","end":"21:56","startHours":20.687114875458608,"endHours":21.931376203035594,"quality":"neutral"},{"name":"Labha","start":"21:56","end":"23:11","startHours":21.931376203035594,"endHours":23.175637530612576,"quality":"auspicious"},{"name":"Amṛta","start":"23:11","end":"00:25","startHours":23.175637530612576,"endHours":24.419898858189562,"quality":"auspicious"},{"name":"Kāla","start":"00:25","end":"01:40","startHours":24.419898858189562,"endHours":25.664160185766544,"quality":"inauspicious"},{"name":"Śubha","start":"01:40","end":"02:55","startHours":25.664160185766544,"endHours":26.908421513343526,"quality":"auspicious"},{"name":"Roga","start":"02:55","end":"04:09","startHours":26.908421513343526,"endHours":28.152682840920512,"quality":"inauspicious"},{"name":"Udveg","start":"04:09","end":"05:24","startHours":28.152682840920512,"endHours":29.396944168497495,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"05:24","end":"06:24","startHours":5.396944168497495,"endHours":6.396944168497495,"planetary_lord":"Mercury"},{"name":"Hora 2","start":"06:24","end":"07:24","startHours":6.396944168497495,"endHours":7.396944168497495,"planetary_lord":"Venus"},{"name":"Hora 3","start":"07:24","end":"08:24","startHours":7.396944168497495,"endHours":8.396944168497495,"planetary_lord":"Sun"},{"name":"Hora 4","start":"08:24","end":"09:24","startHours":8.396944168497495,"endHours":9.396944168497495,"planetary_lord":"Mars"},{"name":"Hora 5","start":"09:24","end":"10:24","startHours":9.396944168497495,"endHours":10.396944168497495,"planetary_lord":"Jupiter"},{"name":"Hora 6","start":"10:24","end":"11:24","startHours":10.396944168497495,"endHours":11.396944168497495,"planetary_lord":"Saturn"},{"name":"Hora 7","start":"11:24","end":"12:24","startHours":11.396944168497495,"endHours":12.396944168497495,"planetary_lord":"Moon"},{"name":"Hora 8","start":"12:24","end":"13:24","startHours":12.396944168497495,"endHours":13.396944168497495,"planetary_lord":"Mercury"},{"name":"Hora 9","start":"13:24","end":"14:24","startHours":13.396944168497495,"endHours":14.396944168497495,"planetary_lord":"Venus"},{"name":"Hora 10","start":"14:24","end":"15:24","startHours":14.396944168497495,"endHours":15.396944168497495,"planetary_lord":"Sun"},{"name":"Hora 11","start":"15:24","end":"16:24","startHours":15.396944168497495,"endHours":16.396944168497495,"planetary_lord":"Mars"},{"name":"Hora 12","start":"16:24","end":"17:24","startHours":16.396944168497495,"endHours":17.396944168497495,"planetary_lord":"Jupiter"},{"name":"Hora 13","start":"17:24","end":"18:24","startHours":17.396944168497495,"endHours":18.396944168497495,"planetary_lord":"Saturn"},{"name":"Hora 14","start":"18:24","end":"19:24","startHours":18.396944168497495,"endHours":19.396944168497495,"planetary_lord":"Moon"},{"name":"Hora 15","start":"19:24","end":"20:24","startHours":19.396944168497495,"endHours":20.396944168497495,"planetary_lord":"Mercury"},{"name":"Hora 16","start":"20:24","end":"21:24","startHours":20.396944168497495,"endHours":21.396944168497495,"planetary_lord":"Venus"},{"name":"Hora 17","start":"21:24","end":"22:24","startHours":21.396944168497495,"endHours":22.396944168497495,"planetary_lord":"Sun"},{"name":"Hora 18","start":"22:24","end":"23:24","startHours":22.396944168497495,"endHours":23.396944168497495,"planetary_lord":"Mars"},{"name":"Hora 19","start":"23:24","end":"00:24","startHours":23.396944168497495,"endHours":24.396944168497495,"planetary_lord":"Jupiter"},{"name":"Hora 20","start":"00:24","end":"01:24","startHours":24.396944168497495,"endHours":25.396944168497495,"planetary_lord":"Saturn"},{"name":"Hora 21","start":"01:24","end":"02:24","startHours":25.396944168497495,"endHours":26.396944168497495,"planetary_lord":"Moon"},{"name":"Hora 22","start":"02:24","end":"03:24","startHours":26.396944168497495,"endHours":27.396944168497495,"planetary_lord":"Mercury"},{"name":"Hora 23","start":"03:24","end":"04:24","startHours":27.396944168497495,"endHours":28.396944168497495,"planetary_lord":"Venus"},{"name":"Hora 24","start":"04:24","end":"05:24","startHours":28.396944168497495,"endHours":29.396944168497495,"planetary_lord":"Sun"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Puṣya","Aśleṣā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Anurādhā","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Rohiṇī","Mṛgaśirā","Ārdrā","Punarvasu","Hasta","Citrā","Svātī","Viśākhā","Śravaṇa","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Meṣa","Karka","Siṃha","Vṛścika","Dhanu","Kumbha"],"unfavorable_rashis":["Vṛṣabha","Mithuna","Kanyā","Tulā","Makara","Mīna"]},"dishaShool":"North (Uttara)","chandraVasa":"South","rahuVasa":"South-West","anandadiYoga":{"name":"Vajra","quality":"Inauspicious"},"drikRitu":"Hemanta (Pre-winter) (Drik)","vedicRitu":"Hemanta (Pre-winter)","drikAyana":"Uttarāyaṇa","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":-21.542058463484437,"eotMinutes":-8.635931491373626,"ayanamsa":24.2306}},"calendars":{"vikram_samvat":2084,"vikram_samvatsara":"Raudra","saka_samvat":1949,"saka_samvatsara":"Plavaṅga","bengali_samvat":1434,"malayalam_era":1203,"nanakshahi_year":558,"lunar_month":"Pauṣa","lunar_month_paksha_full":"Pauṣa Śukla Pakṣa","solar_month":"Dhanus (Mārgaḻi)","ritu":"Hemanta (Pre-winter)","display_summary":"Pauṣa Śukla Ṣaṣṭhī · Vikram 2084 Raudra · Śaka 1949 Plavaṅga"},"festivals":[{"id":"lohri","name":"Lohri","name_sanskrit":"लोहड़ी","tradition":"Regional","significance":"Punjab harvest festival; eve of Makara Saṅkrānti. (Approximated as 13/14 January annually; correct via Sun in Dhanu/Makara cusp.)","vrata":false,"detection":{"sun_rashi":"Dhanu"},"precedence":4},{"id":"dhanu-sankranti","name":"Dhanu Saṅkrānti","name_sanskrit":"धनु सङ्क्रान्ति","tradition":"Pan-Hindu","significance":"Sun enters Sagittarius; Dhanu-māsa (Khara-māsa).","vrata":false,"detection":{"sun_rashi":"Dhanu"},"precedence":5}],"todays_walk":{"walk":{"id":"budha-walk","name":"Budha Walk","name_sanskrit":"बुध यात्रा","type":"graha","description":"Discrimination + BG 2.41 (vyavasāyātmikā buddhi).","step_count":6,"url":"/walk/budha-walk"},"reason":"Budhavāra (Wednesday) — 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 January 13, 2027 CE · Perth, Australia · Vidhyamitra","description":"January 13, 2027 CE for Perth, Australia: Śukla Ṣaṣṭhī, sūryodaya 05:24, sūryāsta 19:27.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/2027-01-13","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/2027-01-13","sa":"https://sa.vidhyamitra.com/city/perth/2027-01-13","hi":"https://hi.vidhyamitra.com/city/perth/2027-01-13","x-default":"https://vidhyamitra.com/city/perth/2027-01-13"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-15T00:50:18.380Z","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":"2026-05-15T00:50:18.380Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-15T00:50:18.380Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}