{"id":"vidhyamitra:city-day:perth:1998-04-18:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1998-04-18","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1998-04-18","date_display":"April 18, 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":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2450921.770833,"kali_year":5100,"ahargana":1862456.2708,"sun":{"sidereal_longitude":4.1097,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":256.1942,"rashi":9,"rashi_name":"Dhanu"},"tithi":{"number":22,"name":"Saptamī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Saptamī","elongation_degrees":252.0845,"elapsed_within_tithi_degrees":0.0845},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":1,"moon_longitude":256.1942,"elapsed_within_degrees":2.8609},"yoga":{"number":20,"name":"Śiva","sum_longitude":260.3039},"karana":{"half_tithi_index":42,"name":"Viṣṭi"},"vara":{"number":1,"name":"Śanivāra (Saturday)"}},"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":18,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2450921.770833,"ahargana":1862456.2708,"kali_year":5100,"ayanamsa_lahiri":23.8292,"grahas":{"sun":{"sidereal_longitude":3.9860219999999913,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":2},"retrograde":false},"moon":{"sidereal_longitude":252.51552200000003,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":4},"retrograde":false,"latitude":3.969},"mars":{"sidereal_longitude":9.94492200000002,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":346.316122,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":4},"retrograde":true},"jupiter":{"sidereal_longitude":323.074622,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":1},"retrograde":false},"venus":{"sidereal_longitude":318.75692200000003,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":4},"retrograde":false},"saturn":{"sidereal_longitude":0.08272199999998975,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":1},"retrograde":false},"rahu":{"sidereal_longitude":138.104,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":11,"name":"Pūrva Phalgunī","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":318.104,"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":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2450921.770833,"kali_year":5100,"ahargana":1862456.2708,"sun":{"sidereal_longitude":4.1097,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":256.1942,"rashi":9,"rashi_name":"Dhanu"},"tithi":{"number":22,"name":"Saptamī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Saptamī","elongation_degrees":252.0845,"elapsed_within_tithi_degrees":0.0845},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":1,"moon_longitude":256.1942,"elapsed_within_degrees":2.8609},"yoga":{"number":20,"name":"Śiva","sum_longitude":260.3039},"karana":{"half_tithi_index":42,"name":"Viṣṭi"},"vara":{"number":1,"name":"Śanivāra (Saturday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":3.969,"elongation":107.915},"lunar":{"type":"lunar","occurs":false,"moon_latitude":3.969,"opposition_distance":72.085}},"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":"06:39","sunsetLocal":"17:53","solarNoonLocal":"12:16","dayLengthHours":11.232037969902796,"dayLengthDisplay":"11 Hours 13 Mins 55 Secs","nightLengthDisplay":"12 Hours 46 Mins 05 Secs","moonriseLocal":"21:45","moonsetLocal":"11:56","rahuKala":{"name":"Rāhu Kāla","start":"09:28","end":"10:52","startHours":9.45952579259291,"endHours":10.863530538830759,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"13:40","end":"15:05","startHours":13.671540031306458,"endHours":15.075544777544307,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"06:39","end":"08:03","startHours":6.65151630011721,"endHours":8.055521046355059,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:16","end":"09:39","startHours":9.272325159761195,"endHours":9.646726425424623,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:07","end":"07:25","startHours":7.119517882196494,"endHours":7.419038894727235,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:54","end":"12:39","startHours":11.893134019405183,"endHours":12.641936550732035,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:09","end":"05:54","startHours":5.153911237463504,"endHours":5.902713768790357,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:43","end":"06:39","startHours":5.715513135958644,"endHours":6.65151630011721,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:08","end":"14:53","startHours":14.139541613385742,"endHours":14.888344144712594,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:41","end":"18:05","startHours":17.683554270020007,"endHours":18.083554270020006,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:53","end":"18:21","startHours":17.883554270020007,"endHours":18.35155585209929,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:38","end":"19:23","startHours":17.633554270020007,"endHours":19.383554270020007,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:54","end":"00:39","startHours":23.893134019405185,"endHours":24.641936550732037,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Kāla","start":"06:39","end":"08:03","startHours":6.65151630011721,"endHours":8.055521046355059,"quality":"inauspicious"},{"name":"Śubha","start":"08:03","end":"09:28","startHours":8.055521046355059,"endHours":9.45952579259291,"quality":"auspicious"},{"name":"Roga","start":"09:28","end":"10:52","startHours":9.45952579259291,"endHours":10.863530538830759,"quality":"inauspicious"},{"name":"Udveg","start":"10:52","end":"12:16","startHours":10.863530538830759,"endHours":12.267535285068607,"quality":"inauspicious"},{"name":"Chala","start":"12:16","end":"13:40","startHours":12.267535285068607,"endHours":13.671540031306458,"quality":"neutral"},{"name":"Labha","start":"13:40","end":"15:05","startHours":13.671540031306458,"endHours":15.075544777544307,"quality":"auspicious"},{"name":"Amṛta","start":"15:05","end":"16:29","startHours":15.075544777544307,"endHours":16.479549523782158,"quality":"auspicious"},{"name":"Kāla","start":"16:29","end":"17:53","startHours":16.479549523782158,"endHours":17.883554270020007,"quality":"inauspicious"}],"nightChoghadiyas":[{"name":"Labha","start":"17:53","end":"19:29","startHours":17.883554270020007,"endHours":19.479549523782158,"quality":"auspicious"},{"name":"Amṛta","start":"19:29","end":"21:05","startHours":19.479549523782158,"endHours":21.07554477754431,"quality":"auspicious"},{"name":"Kāla","start":"21:05","end":"22:40","startHours":21.07554477754431,"endHours":22.671540031306456,"quality":"inauspicious"},{"name":"Śubha","start":"22:40","end":"00:16","startHours":22.671540031306456,"endHours":24.267535285068607,"quality":"auspicious"},{"name":"Roga","start":"00:16","end":"01:52","startHours":24.267535285068607,"endHours":25.86353053883076,"quality":"inauspicious"},{"name":"Udveg","start":"01:52","end":"03:28","startHours":25.86353053883076,"endHours":27.45952579259291,"quality":"inauspicious"},{"name":"Chala","start":"03:28","end":"05:03","startHours":27.45952579259291,"endHours":29.05552104635506,"quality":"neutral"},{"name":"Labha","start":"05:03","end":"06:39","startHours":29.05552104635506,"endHours":30.65151630011721,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"06:39","end":"07:39","startHours":6.65151630011721,"endHours":7.65151630011721,"planetary_lord":"Saturn"},{"name":"Hora 2","start":"07:39","end":"08:39","startHours":7.65151630011721,"endHours":8.65151630011721,"planetary_lord":"Moon"},{"name":"Hora 3","start":"08:39","end":"09:39","startHours":8.65151630011721,"endHours":9.65151630011721,"planetary_lord":"Mercury"},{"name":"Hora 4","start":"09:39","end":"10:39","startHours":9.65151630011721,"endHours":10.65151630011721,"planetary_lord":"Venus"},{"name":"Hora 5","start":"10:39","end":"11:39","startHours":10.65151630011721,"endHours":11.65151630011721,"planetary_lord":"Sun"},{"name":"Hora 6","start":"11:39","end":"12:39","startHours":11.65151630011721,"endHours":12.65151630011721,"planetary_lord":"Mars"},{"name":"Hora 7","start":"12:39","end":"13:39","startHours":12.65151630011721,"endHours":13.65151630011721,"planetary_lord":"Jupiter"},{"name":"Hora 8","start":"13:39","end":"14:39","startHours":13.65151630011721,"endHours":14.65151630011721,"planetary_lord":"Saturn"},{"name":"Hora 9","start":"14:39","end":"15:39","startHours":14.65151630011721,"endHours":15.65151630011721,"planetary_lord":"Moon"},{"name":"Hora 10","start":"15:39","end":"16:39","startHours":15.65151630011721,"endHours":16.65151630011721,"planetary_lord":"Mercury"},{"name":"Hora 11","start":"16:39","end":"17:39","startHours":16.65151630011721,"endHours":17.65151630011721,"planetary_lord":"Venus"},{"name":"Hora 12","start":"17:39","end":"18:39","startHours":17.65151630011721,"endHours":18.65151630011721,"planetary_lord":"Sun"},{"name":"Hora 13","start":"18:39","end":"19:39","startHours":18.65151630011721,"endHours":19.65151630011721,"planetary_lord":"Mars"},{"name":"Hora 14","start":"19:39","end":"20:39","startHours":19.65151630011721,"endHours":20.65151630011721,"planetary_lord":"Jupiter"},{"name":"Hora 15","start":"20:39","end":"21:39","startHours":20.65151630011721,"endHours":21.65151630011721,"planetary_lord":"Saturn"},{"name":"Hora 16","start":"21:39","end":"22:39","startHours":21.65151630011721,"endHours":22.65151630011721,"planetary_lord":"Moon"},{"name":"Hora 17","start":"22:39","end":"23:39","startHours":22.65151630011721,"endHours":23.65151630011721,"planetary_lord":"Mercury"},{"name":"Hora 18","start":"23:39","end":"00:39","startHours":23.65151630011721,"endHours":24.65151630011721,"planetary_lord":"Venus"},{"name":"Hora 19","start":"00:39","end":"01:39","startHours":24.65151630011721,"endHours":25.65151630011721,"planetary_lord":"Sun"},{"name":"Hora 20","start":"01:39","end":"02:39","startHours":25.65151630011721,"endHours":26.65151630011721,"planetary_lord":"Mars"},{"name":"Hora 21","start":"02:39","end":"03:39","startHours":26.65151630011721,"endHours":27.65151630011721,"planetary_lord":"Jupiter"},{"name":"Hora 22","start":"03:39","end":"04:39","startHours":27.65151630011721,"endHours":28.65151630011721,"planetary_lord":"Saturn"},{"name":"Hora 23","start":"04:39","end":"05:39","startHours":28.65151630011721,"endHours":29.65151630011721,"planetary_lord":"Moon"},{"name":"Hora 24","start":"05:39","end":"06:39","startHours":29.65151630011721,"endHours":30.65151630011721,"planetary_lord":"Mercury"}],"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":"East (Pūrva)","chandraVasa":"East","rahuVasa":"East","anandadiYoga":{"name":"Utpāta","quality":"Inauspicious"},"tropicalRitu":"Vasanta (Spring)","vedicRitu":"Vasanta (Spring)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":10.695565910122093,"eotMinutes":0.5058828958834352,"ayanamsa":23.8292}},"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 Saptamī · Vikram 2055 Khara · Śaka 1920 Bahudhānya"},"festivals":[],"todays_walk":{"walk":{"id":"shani-walk","name":"Śani Walk","name_sanskrit":"शनि यात्रा","type":"graha","description":"Tapas + endurance + BG 17.14-19.","step_count":7,"url":"/walk/shani-walk"},"reason":"Śanivāra (Saturday) — 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 18, 1998 CE · Perth, Australia · Vidhyamitra","description":"April 18, 1998 CE for Perth, Australia: Kṛṣṇa Saptamī, sūryodaya 06:39, sūryāsta 17:53.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1998-04-18","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1998-04-18","sa":"https://sa.vidhyamitra.com/city/perth/1998-04-18","hi":"https://hi.vidhyamitra.com/city/perth/1998-04-18","x-default":"https://vidhyamitra.com/city/perth/1998-04-18"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-01T03:47:10.233Z","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":"2026-06-01T03:47:10.233Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-01T03:47:10.233Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}