{"id":"vidhyamitra:city-day:perth:1981-01-12:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1981-01-12","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-01-12","date_display":"January 12, 1981 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":1981,"month":1,"day":12,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444616.770833,"kali_year":5082,"ahargana":1856151.2708,"sun":{"sidereal_longitude":268.0751,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":340.2558,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":7,"name":"Saptamī","paksha":"Śukla","full_name":"Śukla Saptamī","elongation_degrees":72.1807,"elapsed_within_tithi_degrees":0.1807},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":3,"moon_longitude":340.2558,"elapsed_within_degrees":6.9225},"yoga":{"number":19,"name":"Parigha","sum_longitude":248.331},"karana":{"half_tithi_index":12,"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":1981,"month":1,"day":12,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444616.770833,"ahargana":1856151.2708,"kali_year":5082,"ayanamsa_lahiri":23.588,"grahas":{"sun":{"sidereal_longitude":268.16562,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":1},"retrograde":false},"moon":{"sidereal_longitude":340.03122,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":3},"retrograde":false,"latitude":-3.347},"mars":{"sidereal_longitude":286.24882,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":2},"retrograde":false},"mercury":{"sidereal_longitude":275.69772,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":3},"retrograde":false},"jupiter":{"sidereal_longitude":166.59011999999996,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":false},"venus":{"sidereal_longitude":247.63102000000003,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":165.91992000000005,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":false},"rahu":{"sidereal_longitude":112.1732,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":292.1732,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","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":1981,"month":1,"day":12,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444616.770833,"kali_year":5082,"ahargana":1856151.2708,"sun":{"sidereal_longitude":268.0751,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":340.2558,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":7,"name":"Saptamī","paksha":"Śukla","full_name":"Śukla Saptamī","elongation_degrees":72.1807,"elapsed_within_tithi_degrees":0.1807},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":3,"moon_longitude":340.2558,"elapsed_within_degrees":6.9225},"yoga":{"number":19,"name":"Parigha","sum_longitude":248.331},"karana":{"half_tithi_index":12,"name":"Gara"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-3.347,"elongation":72.181},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-3.347,"opposition_distance":107.819}},"eclipse_window_40days":[{"offset_days":8,"type":"lunar","occurs":true,"moon_latitude":-1.332,"opposition_distance":1.776}]},"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":"05:23","sunsetLocal":"19:27","solarNoonLocal":"12:25","dayLengthHours":14.059726279176449,"dayLengthDisplay":"14 Hours 03 Mins 35 Secs","nightLengthDisplay":"9 Hours 56 Mins 25 Secs","moonriseLocal":"11:13","moonsetLocal":"23:11","rahuKala":{"name":"Rāhu Kāla","start":"07:08","end":"08:54","startHours":7.141327355915129,"endHours":8.898793140812185,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"10:39","end":"12:25","startHours":10.656258925709242,"endHours":12.413724710606298,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"14:10","end":"15:56","startHours":14.171190495503353,"endHours":15.92865628040041,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:40","end":"09:08","startHours":8.664464369492578,"endHours":9.133121912131793,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"05:58","end":"06:21","startHours":5.969683499317092,"endHours":6.344609533428464,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:57","end":"12:53","startHours":11.945067167967082,"endHours":12.882382253245513,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:31","end":"04:27","startHours":3.5092314004612133,"endHours":4.446546485739644,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:13","end":"05:23","startHours":4.212217714420036,"endHours":5.383861571018073,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:45","end":"15:42","startHours":14.757012423802372,"endHours":15.694327509080802,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"19:15","end":"19:39","startHours":19.243587850194523,"endHours":19.64358785019452,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"19:27","end":"20:02","startHours":19.443587850194522,"endHours":20.02940977849354,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"19:12","end":"20:57","startHours":19.193587850194522,"endHours":20.943587850194522,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:57","end":"00:53","startHours":23.945067167967082,"endHours":24.88238225324551,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Amṛta","start":"05:23","end":"07:08","startHours":5.383861571018073,"endHours":7.141327355915129,"quality":"auspicious"},{"name":"Kāla","start":"07:08","end":"08:54","startHours":7.141327355915129,"endHours":8.898793140812185,"quality":"inauspicious"},{"name":"Śubha","start":"08:54","end":"10:39","startHours":8.898793140812185,"endHours":10.656258925709242,"quality":"auspicious"},{"name":"Roga","start":"10:39","end":"12:25","startHours":10.656258925709242,"endHours":12.413724710606298,"quality":"inauspicious"},{"name":"Udveg","start":"12:25","end":"14:10","startHours":12.413724710606298,"endHours":14.171190495503353,"quality":"inauspicious"},{"name":"Chala","start":"14:10","end":"15:56","startHours":14.171190495503353,"endHours":15.92865628040041,"quality":"neutral"},{"name":"Labha","start":"15:56","end":"17:41","startHours":15.92865628040041,"endHours":17.686122065297468,"quality":"auspicious"},{"name":"Amṛta","start":"17:41","end":"19:27","startHours":17.686122065297468,"endHours":19.443587850194522,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Chala","start":"19:27","end":"20:41","startHours":19.443587850194522,"endHours":20.686122065297464,"quality":"neutral"},{"name":"Labha","start":"20:41","end":"21:56","startHours":20.686122065297464,"endHours":21.92865628040041,"quality":"auspicious"},{"name":"Amṛta","start":"21:56","end":"23:10","startHours":21.92865628040041,"endHours":23.171190495503353,"quality":"auspicious"},{"name":"Kāla","start":"23:10","end":"00:25","startHours":23.171190495503353,"endHours":24.413724710606296,"quality":"inauspicious"},{"name":"Śubha","start":"00:25","end":"01:39","startHours":24.413724710606296,"endHours":25.656258925709242,"quality":"auspicious"},{"name":"Roga","start":"01:39","end":"02:54","startHours":25.656258925709242,"endHours":26.898793140812185,"quality":"inauspicious"},{"name":"Udveg","start":"02:54","end":"04:08","startHours":26.898793140812185,"endHours":28.14132735591513,"quality":"inauspicious"},{"name":"Chala","start":"04:08","end":"05:23","startHours":28.14132735591513,"endHours":29.383861571018073,"quality":"neutral"}],"horas":[{"name":"Hora 1","start":"05:23","end":"06:23","startHours":5.383861571018073,"endHours":6.383861571018073,"planetary_lord":"Moon"},{"name":"Hora 2","start":"06:23","end":"07:23","startHours":6.383861571018073,"endHours":7.383861571018073,"planetary_lord":"Mercury"},{"name":"Hora 3","start":"07:23","end":"08:23","startHours":7.383861571018073,"endHours":8.383861571018073,"planetary_lord":"Venus"},{"name":"Hora 4","start":"08:23","end":"09:23","startHours":8.383861571018073,"endHours":9.383861571018073,"planetary_lord":"Sun"},{"name":"Hora 5","start":"09:23","end":"10:23","startHours":9.383861571018073,"endHours":10.383861571018073,"planetary_lord":"Mars"},{"name":"Hora 6","start":"10:23","end":"11:23","startHours":10.383861571018073,"endHours":11.383861571018073,"planetary_lord":"Jupiter"},{"name":"Hora 7","start":"11:23","end":"12:23","startHours":11.383861571018073,"endHours":12.383861571018073,"planetary_lord":"Saturn"},{"name":"Hora 8","start":"12:23","end":"13:23","startHours":12.383861571018073,"endHours":13.383861571018073,"planetary_lord":"Moon"},{"name":"Hora 9","start":"13:23","end":"14:23","startHours":13.383861571018073,"endHours":14.383861571018073,"planetary_lord":"Mercury"},{"name":"Hora 10","start":"14:23","end":"15:23","startHours":14.383861571018073,"endHours":15.383861571018073,"planetary_lord":"Venus"},{"name":"Hora 11","start":"15:23","end":"16:23","startHours":15.383861571018073,"endHours":16.383861571018073,"planetary_lord":"Sun"},{"name":"Hora 12","start":"16:23","end":"17:23","startHours":16.383861571018073,"endHours":17.383861571018073,"planetary_lord":"Mars"},{"name":"Hora 13","start":"17:23","end":"18:23","startHours":17.383861571018073,"endHours":18.383861571018073,"planetary_lord":"Jupiter"},{"name":"Hora 14","start":"18:23","end":"19:23","startHours":18.383861571018073,"endHours":19.383861571018073,"planetary_lord":"Saturn"},{"name":"Hora 15","start":"19:23","end":"20:23","startHours":19.383861571018073,"endHours":20.383861571018073,"planetary_lord":"Moon"},{"name":"Hora 16","start":"20:23","end":"21:23","startHours":20.383861571018073,"endHours":21.383861571018073,"planetary_lord":"Mercury"},{"name":"Hora 17","start":"21:23","end":"22:23","startHours":21.383861571018073,"endHours":22.383861571018073,"planetary_lord":"Venus"},{"name":"Hora 18","start":"22:23","end":"23:23","startHours":22.383861571018073,"endHours":23.383861571018073,"planetary_lord":"Sun"},{"name":"Hora 19","start":"23:23","end":"00:23","startHours":23.383861571018073,"endHours":24.383861571018073,"planetary_lord":"Mars"},{"name":"Hora 20","start":"00:23","end":"01:23","startHours":24.383861571018073,"endHours":25.383861571018073,"planetary_lord":"Jupiter"},{"name":"Hora 21","start":"01:23","end":"02:23","startHours":25.383861571018073,"endHours":26.383861571018073,"planetary_lord":"Saturn"},{"name":"Hora 22","start":"02:23","end":"03:23","startHours":26.383861571018073,"endHours":27.383861571018073,"planetary_lord":"Moon"},{"name":"Hora 23","start":"03:23","end":"04:23","startHours":27.383861571018073,"endHours":28.383861571018073,"planetary_lord":"Mercury"},{"name":"Hora 24","start":"04:23","end":"05:23","startHours":28.383861571018073,"endHours":29.383861571018073,"planetary_lord":"Venus"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Rohiṇī","Aśleṣā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Jyeṣṭhā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Revatī"],"unfavorable_nakshatras":["Mṛgaśirā","Ārdrā","Punarvasu","Puṣya","Citrā","Svātī","Viśākhā","Anurādhā","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Vṛṣabha","Siṃha","Kanyā","Dhanu","Makara","Mīna"],"unfavorable_rashis":["Meṣa","Mithuna","Karka","Tulā","Vṛścika","Kumbha"]},"dishaShool":"East (Pūrva)","chandraVasa":"South-West","rahuVasa":"North-East","anandadiYoga":{"name":"Kāladaṇḍa","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":-21.679136220686505,"eotMinutes":-8.265482636377905,"ayanamsa":23.588}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Pauṣa","lunar_month_paksha_full":"Pauṣa Śukla Pakṣa","solar_month":"Dhanus (Mārgaḻi)","ritu":"Hemanta (Pre-winter)","display_summary":"Pauṣa Śukla Saptamī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"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":"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 January 12, 1981 CE · Perth, Australia · Vidhyamitra","description":"January 12, 1981 CE for Perth, Australia: Śukla Saptamī, sūryodaya 05:23, sūryāsta 19:27.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1981-01-12","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1981-01-12","sa":"https://sa.vidhyamitra.com/city/perth/1981-01-12","hi":"https://hi.vidhyamitra.com/city/perth/1981-01-12","x-default":"https://vidhyamitra.com/city/perth/1981-01-12"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-18T13:13:16.438Z","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":"2026-05-18T13:13:16.438Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-18T13:13:16.438Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}