{"id":"vidhyamitra:city-day:perth:1998-04-15:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1998-04-15","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1998-04-15","date_display":"April 15, 1998 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":1998,"month":4,"day":15,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2450918.770833,"kali_year":5099,"ahargana":1862453.2708,"sun":{"sidereal_longitude":1.1855,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":218.309,"rashi":8,"rashi_name":"Vṛścika"},"tithi":{"number":19,"name":"Caturthī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Caturthī","elongation_degrees":217.1235,"elapsed_within_tithi_degrees":1.1235},"nakshatra":{"number":17,"name":"Anurādhā","pada":2,"moon_longitude":218.309,"elapsed_within_degrees":4.9756},"yoga":{"number":17,"name":"Vyatīpāta","sum_longitude":219.4945},"karana":{"half_tithi_index":36,"name":"Bava"},"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":1998,"month":4,"day":15,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2450918.770833,"ahargana":1862453.2708,"kali_year":5099,"ayanamsa_lahiri":23.829,"grahas":{"sun":{"sidereal_longitude":1.0509369999999763,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":1},"retrograde":false},"moon":{"sidereal_longitude":215.175837,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","pada":1},"retrograde":false,"latitude":4.4321},"mars":{"sidereal_longitude":7.711137000000008,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":347.314137,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":1},"retrograde":true},"jupiter":{"sidereal_longitude":322.43883700000004,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":1},"retrograde":false},"venus":{"sidereal_longitude":315.511937,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":359.703037,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":4},"retrograde":false},"rahu":{"sidereal_longitude":138.263,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":318.263,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","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":1998,"month":4,"day":15,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2450918.770833,"kali_year":5099,"ahargana":1862453.2708,"sun":{"sidereal_longitude":1.1855,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":218.309,"rashi":8,"rashi_name":"Vṛścika"},"tithi":{"number":19,"name":"Caturthī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Caturthī","elongation_degrees":217.1235,"elapsed_within_tithi_degrees":1.1235},"nakshatra":{"number":17,"name":"Anurādhā","pada":2,"moon_longitude":218.309,"elapsed_within_degrees":4.9756},"yoga":{"number":17,"name":"Vyatīpāta","sum_longitude":219.4945},"karana":{"half_tithi_index":36,"name":"Bava"},"vara":{"number":5,"name":"Budhavāra (Wednesday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":4.432,"elongation":142.877},"lunar":{"type":"lunar","occurs":false,"moon_latitude":4.432,"opposition_distance":37.123}},"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":"06:37","sunsetLocal":"17:56","solarNoonLocal":"12:17","dayLengthHours":11.323221730013477,"dayLengthDisplay":"11 Hours 19 Mins 24 Secs","nightLengthDisplay":"12 Hours 40 Mins 36 Secs","moonriseLocal":"19:38","moonsetLocal":"09:29","rahuKala":{"name":"Rāhu Kāla","start":"12:17","end":"13:42","startHours":12.279968734296784,"endHours":13.69537145054847,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"08:02","end":"09:27","startHours":8.03376058554173,"endHours":9.449163301793416,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"10:52","end":"12:17","startHours":10.8645660180451,"endHours":12.279968734296784,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:16","end":"09:38","startHours":9.260442939626524,"endHours":9.637883663960306,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:05","end":"07:24","startHours":7.090158774707274,"endHours":7.3921113541743,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:54","end":"12:39","startHours":11.902528009963001,"endHours":12.657409458630566,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:07","end":"05:52","startHours":5.108594971954916,"endHours":5.86347642062248,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:40","end":"06:37","startHours":5.674756058455589,"endHours":6.618357869290046,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:10","end":"14:55","startHours":14.167172355965697,"endHours":14.922053804633261,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:44","end":"18:08","startHours":17.741579599303524,"endHours":18.141579599303522,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:56","end":"18:25","startHours":17.941579599303523,"endHours":18.413380504720752,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:41","end":"19:26","startHours":17.691579599303523,"endHours":19.441579599303523,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:54","end":"00:39","startHours":23.902528009963,"endHours":24.657409458630568,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Labha","start":"06:37","end":"08:02","startHours":6.618357869290046,"endHours":8.03376058554173,"quality":"auspicious"},{"name":"Amṛta","start":"08:02","end":"09:27","startHours":8.03376058554173,"endHours":9.449163301793416,"quality":"auspicious"},{"name":"Kāla","start":"09:27","end":"10:52","startHours":9.449163301793416,"endHours":10.8645660180451,"quality":"inauspicious"},{"name":"Śubha","start":"10:52","end":"12:17","startHours":10.8645660180451,"endHours":12.279968734296784,"quality":"auspicious"},{"name":"Roga","start":"12:17","end":"13:42","startHours":12.279968734296784,"endHours":13.69537145054847,"quality":"inauspicious"},{"name":"Udveg","start":"13:42","end":"15:07","startHours":13.69537145054847,"endHours":15.110774166800153,"quality":"inauspicious"},{"name":"Chala","start":"15:07","end":"16:32","startHours":15.110774166800153,"endHours":16.52617688305184,"quality":"neutral"},{"name":"Labha","start":"16:32","end":"17:56","startHours":16.52617688305184,"endHours":17.941579599303523,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Udveg","start":"17:56","end":"19:32","startHours":17.941579599303523,"endHours":19.52617688305184,"quality":"inauspicious"},{"name":"Chala","start":"19:32","end":"21:07","startHours":19.52617688305184,"endHours":21.110774166800155,"quality":"neutral"},{"name":"Labha","start":"21:07","end":"22:42","startHours":21.110774166800155,"endHours":22.69537145054847,"quality":"auspicious"},{"name":"Amṛta","start":"22:42","end":"00:17","startHours":22.69537145054847,"endHours":24.279968734296784,"quality":"auspicious"},{"name":"Kāla","start":"00:17","end":"01:52","startHours":24.279968734296784,"endHours":25.8645660180451,"quality":"inauspicious"},{"name":"Śubha","start":"01:52","end":"03:27","startHours":25.8645660180451,"endHours":27.449163301793416,"quality":"auspicious"},{"name":"Roga","start":"03:27","end":"05:02","startHours":27.449163301793416,"endHours":29.033760585541728,"quality":"inauspicious"},{"name":"Udveg","start":"05:02","end":"06:37","startHours":29.033760585541728,"endHours":30.618357869290044,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"06:37","end":"07:37","startHours":6.618357869290046,"endHours":7.618357869290046,"planetary_lord":"Mercury"},{"name":"Hora 2","start":"07:37","end":"08:37","startHours":7.618357869290046,"endHours":8.618357869290046,"planetary_lord":"Venus"},{"name":"Hora 3","start":"08:37","end":"09:37","startHours":8.618357869290046,"endHours":9.618357869290046,"planetary_lord":"Sun"},{"name":"Hora 4","start":"09:37","end":"10:37","startHours":9.618357869290046,"endHours":10.618357869290046,"planetary_lord":"Mars"},{"name":"Hora 5","start":"10:37","end":"11:37","startHours":10.618357869290046,"endHours":11.618357869290046,"planetary_lord":"Jupiter"},{"name":"Hora 6","start":"11:37","end":"12:37","startHours":11.618357869290046,"endHours":12.618357869290046,"planetary_lord":"Saturn"},{"name":"Hora 7","start":"12:37","end":"13:37","startHours":12.618357869290046,"endHours":13.618357869290046,"planetary_lord":"Moon"},{"name":"Hora 8","start":"13:37","end":"14:37","startHours":13.618357869290046,"endHours":14.618357869290046,"planetary_lord":"Mercury"},{"name":"Hora 9","start":"14:37","end":"15:37","startHours":14.618357869290046,"endHours":15.618357869290046,"planetary_lord":"Venus"},{"name":"Hora 10","start":"15:37","end":"16:37","startHours":15.618357869290046,"endHours":16.618357869290044,"planetary_lord":"Sun"},{"name":"Hora 11","start":"16:37","end":"17:37","startHours":16.618357869290044,"endHours":17.618357869290044,"planetary_lord":"Mars"},{"name":"Hora 12","start":"17:37","end":"18:37","startHours":17.618357869290044,"endHours":18.618357869290044,"planetary_lord":"Jupiter"},{"name":"Hora 13","start":"18:37","end":"19:37","startHours":18.618357869290044,"endHours":19.618357869290044,"planetary_lord":"Saturn"},{"name":"Hora 14","start":"19:37","end":"20:37","startHours":19.618357869290044,"endHours":20.618357869290044,"planetary_lord":"Moon"},{"name":"Hora 15","start":"20:37","end":"21:37","startHours":20.618357869290044,"endHours":21.618357869290044,"planetary_lord":"Mercury"},{"name":"Hora 16","start":"21:37","end":"22:37","startHours":21.618357869290044,"endHours":22.618357869290044,"planetary_lord":"Venus"},{"name":"Hora 17","start":"22:37","end":"23:37","startHours":22.618357869290044,"endHours":23.618357869290044,"planetary_lord":"Sun"},{"name":"Hora 18","start":"23:37","end":"00:37","startHours":23.618357869290044,"endHours":24.618357869290044,"planetary_lord":"Mars"},{"name":"Hora 19","start":"00:37","end":"01:37","startHours":24.618357869290044,"endHours":25.618357869290044,"planetary_lord":"Jupiter"},{"name":"Hora 20","start":"01:37","end":"02:37","startHours":25.618357869290044,"endHours":26.618357869290044,"planetary_lord":"Saturn"},{"name":"Hora 21","start":"02:37","end":"03:37","startHours":26.618357869290044,"endHours":27.618357869290044,"planetary_lord":"Moon"},{"name":"Hora 22","start":"03:37","end":"04:37","startHours":27.618357869290044,"endHours":28.618357869290044,"planetary_lord":"Mercury"},{"name":"Hora 23","start":"04:37","end":"05:37","startHours":28.618357869290044,"endHours":29.618357869290044,"planetary_lord":"Venus"},{"name":"Hora 24","start":"05:37","end":"06:37","startHours":29.618357869290044,"endHours":30.618357869290044,"planetary_lord":"Sun"}],"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":"North (Uttara)","chandraVasa":"North-East","rahuVasa":"South-West","anandadiYoga":{"name":"Ānanda","quality":"Auspicious"},"tropicalRitu":"Vasanta (Spring)","vedicRitu":"Vasanta (Spring)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":9.632806016299918,"eotMinutes":-0.240124057807095,"ayanamsa":23.829}},"calendars":{"vikram_samvat":2055,"vikram_samvatsara":"Khara","saka_samvat":1920,"saka_samvatsara":"Bahudhānya","bengali_samvat":1405,"malayalam_era":1174,"nanakshahi_year":529,"lunar_month":"Vaiśākha","lunar_month_paksha_full":"Vaiśākha Kṛṣṇa Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Vaiśākha","lunar_month_amanta":"Caitra","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Mēsha (Cittirai / Vaiśākhī)","ritu":"Vasanta (Spring)","display_summary":"Vaiśākha Kṛṣṇa Caturthī · Vikram 2055 Khara · Śaka 1920 Bahudhānya"},"festivals":[{"id":"sankashti-chaturthi","name":"Saṅkaṣṭī Caturthī","name_sanskrit":"सङ्कष्टी चतुर्थी","tradition":"Pan-Hindu","associated_deity":"Gaṇeśa","significance":"Monthly Gaṇeśa vrata.","vrata":true,"detection":{"tithi_number":19,"tithi_paksha":"Kṛṣṇa"},"precedence":6}],"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 April 15, 1998 CE · Perth, Australia · Vidhyamitra","description":"April 15, 1998 CE for Perth, Australia: Kṛṣṇa Caturthī, sūryodaya 06:37, sūryāsta 17:56.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1998-04-15","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1998-04-15","sa":"https://sa.vidhyamitra.com/city/perth/1998-04-15","hi":"https://hi.vidhyamitra.com/city/perth/1998-04-15","x-default":"https://vidhyamitra.com/city/perth/1998-04-15"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-01T20:50:29.092Z","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":"2026-06-01T20:50:29.092Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-01T20:50:29.092Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}