{"id":"vidhyamitra:city-day:perth:2025-12-18:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/2025-12-18","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"2025-12-18","date_display":"December 18, 2025 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":2025,"month":12,"day":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2461027.770833,"kali_year":5127,"ahargana":1872562.2708,"sun":{"sidereal_longitude":241.7205,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":218.6398,"rashi":8,"rashi_name":"Vṛścika"},"tithi":{"number":29,"name":"Caturdaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Caturdaśī","elongation_degrees":336.9193,"elapsed_within_tithi_degrees":0.9193},"nakshatra":{"number":17,"name":"Anurādhā","pada":2,"moon_longitude":218.6398,"elapsed_within_degrees":5.3064},"yoga":{"number":8,"name":"Dhṛti","sum_longitude":100.3602},"karana":{"half_tithi_index":56,"name":"Viṣṭi"},"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":2025,"month":12,"day":18,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2461027.770833,"ahargana":1872562.2708,"kali_year":5127,"ayanamsa_lahiri":24.2157,"grahas":{"sun":{"sidereal_longitude":242.142699,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":1},"retrograde":false},"moon":{"sidereal_longitude":219.95939899999996,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","pada":2},"retrograde":false,"latitude":-4.3661},"mars":{"sidereal_longitude":247.47199899999998,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":223.396699,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":88.69379900000001,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":7,"name":"Punarvasu","pada":3},"retrograde":true},"venus":{"sidereal_longitude":237.09219900000005,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":18,"name":"Jyeṣṭhā","pada":4},"retrograde":false},"saturn":{"sidereal_longitude":331.37979900000005,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":4},"retrograde":false},"rahu":{"sidereal_longitude":322.6395,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":1},"retrograde":false},"ketu":{"sidereal_longitude":142.6395,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","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":2025,"month":12,"day":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2461027.770833,"kali_year":5127,"ahargana":1872562.2708,"sun":{"sidereal_longitude":241.7205,"rashi":9,"rashi_name":"Dhanu"},"moon":{"sidereal_longitude":218.6398,"rashi":8,"rashi_name":"Vṛścika"},"tithi":{"number":29,"name":"Caturdaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Caturdaśī","elongation_degrees":336.9193,"elapsed_within_tithi_degrees":0.9193},"nakshatra":{"number":17,"name":"Anurādhā","pada":2,"moon_longitude":218.6398,"elapsed_within_degrees":5.3064},"yoga":{"number":8,"name":"Dhṛti","sum_longitude":100.3602},"karana":{"half_tithi_index":56,"name":"Viṣṭi"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-4.366,"elongation":23.081},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-4.366,"opposition_distance":156.919}},"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":"05:07","sunsetLocal":"19:21","solarNoonLocal":"12:14","dayLengthHours":14.234771854581568,"dayLengthDisplay":"14 Hours 14 Mins 05 Secs","nightLengthDisplay":"9 Hours 45 Mins 55 Secs","moonriseLocal":"03:47","moonsetLocal":"17:43","rahuKala":{"name":"Rāhu Kāla","start":"14:01","end":"15:47","startHours":14.008851026020341,"endHours":15.788197507843037,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"05:07","end":"06:53","startHours":5.11211861690686,"endHours":6.891465098729556,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"08:40","end":"10:27","startHours":8.670811580552252,"endHours":10.45015806237495,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:26","end":"08:54","startHours":8.433565382975893,"endHours":8.908057778128612,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"05:42","end":"06:05","startHours":5.705234110847759,"endHours":6.084828026969935,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:45","end":"12:42","startHours":11.755012149044926,"endHours":12.703996939350365,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:13","end":"04:10","startHours":3.214149036295985,"endHours":4.163133826601422,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"03:56","end":"05:07","startHours":3.925887629025063,"endHours":5.11211861690686,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:36","end":"15:33","startHours":14.60196651996124,"endHours":15.550951310266678,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"19:09","end":"19:33","startHours":19.14689047148843,"endHours":19.546890471488428,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"19:21","end":"19:56","startHours":19.34689047148843,"endHours":19.94000596542933,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"19:06","end":"20:51","startHours":19.09689047148843,"endHours":20.84689047148843,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:45","end":"00:42","startHours":23.755012149044926,"endHours":24.703996939350365,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Śubha","start":"05:07","end":"06:53","startHours":5.11211861690686,"endHours":6.891465098729556,"quality":"auspicious"},{"name":"Roga","start":"06:53","end":"08:40","startHours":6.891465098729556,"endHours":8.670811580552252,"quality":"inauspicious"},{"name":"Udveg","start":"08:40","end":"10:27","startHours":8.670811580552252,"endHours":10.45015806237495,"quality":"inauspicious"},{"name":"Chala","start":"10:27","end":"12:14","startHours":10.45015806237495,"endHours":12.229504544197646,"quality":"neutral"},{"name":"Labha","start":"12:14","end":"14:01","startHours":12.229504544197646,"endHours":14.008851026020341,"quality":"auspicious"},{"name":"Amṛta","start":"14:01","end":"15:47","startHours":14.008851026020341,"endHours":15.788197507843037,"quality":"auspicious"},{"name":"Kāla","start":"15:47","end":"17:34","startHours":15.788197507843037,"endHours":17.567543989665733,"quality":"inauspicious"},{"name":"Śubha","start":"17:34","end":"19:21","startHours":17.567543989665733,"endHours":19.34689047148843,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Amṛta","start":"19:21","end":"20:34","startHours":19.34689047148843,"endHours":20.567543989665733,"quality":"auspicious"},{"name":"Kāla","start":"20:34","end":"21:47","startHours":20.567543989665733,"endHours":21.788197507843037,"quality":"inauspicious"},{"name":"Śubha","start":"21:47","end":"23:01","startHours":21.788197507843037,"endHours":23.00885102602034,"quality":"auspicious"},{"name":"Roga","start":"23:01","end":"00:14","startHours":23.00885102602034,"endHours":24.229504544197646,"quality":"inauspicious"},{"name":"Udveg","start":"00:14","end":"01:27","startHours":24.229504544197646,"endHours":25.45015806237495,"quality":"inauspicious"},{"name":"Chala","start":"01:27","end":"02:40","startHours":25.45015806237495,"endHours":26.670811580552254,"quality":"neutral"},{"name":"Labha","start":"02:40","end":"03:53","startHours":26.670811580552254,"endHours":27.891465098729554,"quality":"auspicious"},{"name":"Amṛta","start":"03:53","end":"05:07","startHours":27.891465098729554,"endHours":29.112118616906862,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"05:07","end":"06:07","startHours":5.11211861690686,"endHours":6.11211861690686,"planetary_lord":"Jupiter"},{"name":"Hora 2","start":"06:07","end":"07:07","startHours":6.11211861690686,"endHours":7.11211861690686,"planetary_lord":"Saturn"},{"name":"Hora 3","start":"07:07","end":"08:07","startHours":7.11211861690686,"endHours":8.11211861690686,"planetary_lord":"Moon"},{"name":"Hora 4","start":"08:07","end":"09:07","startHours":8.11211861690686,"endHours":9.11211861690686,"planetary_lord":"Mercury"},{"name":"Hora 5","start":"09:07","end":"10:07","startHours":9.11211861690686,"endHours":10.11211861690686,"planetary_lord":"Venus"},{"name":"Hora 6","start":"10:07","end":"11:07","startHours":10.11211861690686,"endHours":11.11211861690686,"planetary_lord":"Sun"},{"name":"Hora 7","start":"11:07","end":"12:07","startHours":11.11211861690686,"endHours":12.11211861690686,"planetary_lord":"Mars"},{"name":"Hora 8","start":"12:07","end":"13:07","startHours":12.11211861690686,"endHours":13.11211861690686,"planetary_lord":"Jupiter"},{"name":"Hora 9","start":"13:07","end":"14:07","startHours":13.11211861690686,"endHours":14.11211861690686,"planetary_lord":"Saturn"},{"name":"Hora 10","start":"14:07","end":"15:07","startHours":14.11211861690686,"endHours":15.11211861690686,"planetary_lord":"Moon"},{"name":"Hora 11","start":"15:07","end":"16:07","startHours":15.11211861690686,"endHours":16.112118616906862,"planetary_lord":"Mercury"},{"name":"Hora 12","start":"16:07","end":"17:07","startHours":16.112118616906862,"endHours":17.112118616906862,"planetary_lord":"Venus"},{"name":"Hora 13","start":"17:07","end":"18:07","startHours":17.112118616906862,"endHours":18.112118616906862,"planetary_lord":"Sun"},{"name":"Hora 14","start":"18:07","end":"19:07","startHours":18.112118616906862,"endHours":19.112118616906862,"planetary_lord":"Mars"},{"name":"Hora 15","start":"19:07","end":"20:07","startHours":19.112118616906862,"endHours":20.112118616906862,"planetary_lord":"Jupiter"},{"name":"Hora 16","start":"20:07","end":"21:07","startHours":20.112118616906862,"endHours":21.112118616906862,"planetary_lord":"Saturn"},{"name":"Hora 17","start":"21:07","end":"22:07","startHours":21.112118616906862,"endHours":22.112118616906862,"planetary_lord":"Moon"},{"name":"Hora 18","start":"22:07","end":"23:07","startHours":22.112118616906862,"endHours":23.112118616906862,"planetary_lord":"Mercury"},{"name":"Hora 19","start":"23:07","end":"00:07","startHours":23.112118616906862,"endHours":24.112118616906862,"planetary_lord":"Venus"},{"name":"Hora 20","start":"00:07","end":"01:07","startHours":24.112118616906862,"endHours":25.112118616906862,"planetary_lord":"Sun"},{"name":"Hora 21","start":"01:07","end":"02:07","startHours":25.112118616906862,"endHours":26.112118616906862,"planetary_lord":"Mars"},{"name":"Hora 22","start":"02:07","end":"03:07","startHours":26.112118616906862,"endHours":27.112118616906862,"planetary_lord":"Jupiter"},{"name":"Hora 23","start":"03:07","end":"04:07","startHours":27.112118616906862,"endHours":28.112118616906862,"planetary_lord":"Saturn"},{"name":"Hora 24","start":"04:07","end":"05:07","startHours":28.112118616906862,"endHours":29.112118616906862,"planetary_lord":"Moon"}],"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":["Meṣa","Vṛṣabha","Siṃha","Kanyā","Vṛścika","Makara"],"unfavorable_rashis":["Mithuna","Karka","Tulā","Dhanu","Kumbha","Mīna"]},"dishaShool":"South (Dakṣiṇa)","chandraVasa":"North-East","rahuVasa":"North-West","anandadiYoga":{"name":"Saumya","quality":"Auspicious"},"drikRitu":"Hemanta (Pre-winter)","vedicRitu":"Hemanta (Pre-winter)","drikAyana":"Dakṣiṇāyana","vedicAyana":"Dakṣiṇāyana","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":-23.386359592590527,"eotMinutes":2.787727348141232,"ayanamsa":24.2157}},"calendars":{"vikram_samvat":2082,"vikram_samvatsara":"Kālayukta","saka_samvat":1947,"saka_samvatsara":"Viśvāvasu","bengali_samvat":1432,"malayalam_era":1201,"nanakshahi_year":556,"lunar_month":"Pauṣa","lunar_month_paksha_full":"Pauṣa Kṛṣṇa Pakṣa","solar_month":"Dhanus (Mārgaḻi)","ritu":"Hemanta (Pre-winter)","display_summary":"Pauṣa Kṛṣṇa Caturdaśī · Vikram 2082 Kālayukta · Śaka 1947 Viśvāvasu"},"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},{"id":"masika-shivaratri","name":"Māsika Śivarātri","name_sanskrit":"मासिक शिवरात्रि","tradition":"Shaiva","associated_deity":"Śiva","significance":"Monthly Śiva observance.","vrata":true,"detection":{"tithi_number":29,"tithi_paksha":"Kṛṣṇa"},"precedence":6}],"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 December 18, 2025 CE · Perth, Australia · Vidhyamitra","description":"December 18, 2025 CE for Perth, Australia: Kṛṣṇa Caturdaśī, sūryodaya 05:07, sūryāsta 19:21.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/2025-12-18","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/2025-12-18","sa":"https://sa.vidhyamitra.com/city/perth/2025-12-18","hi":"https://hi.vidhyamitra.com/city/perth/2025-12-18","x-default":"https://vidhyamitra.com/city/perth/2025-12-18"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-14T22:38:12.251Z","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":"2026-05-14T22:38:12.251Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-14T22:38:12.251Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}