{"id":"vidhyamitra:city-day:perth:1990-02-01:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/1990-02-01","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1990-02-01","date_display":"February 1, 1990 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":1990,"month":2,"day":1,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2447923.770833,"kali_year":5091,"ahargana":1859458.2708,"sun":{"sidereal_longitude":288.2369,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":354.7533,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":6,"name":"Ṣaṣṭhī","paksha":"Śukla","full_name":"Śukla Ṣaṣṭhī","elongation_degrees":66.5164,"elapsed_within_tithi_degrees":6.5164},"nakshatra":{"number":27,"name":"Revatī","pada":3,"moon_longitude":354.7533,"elapsed_within_degrees":8.0866},"yoga":{"number":22,"name":"Sādhya","sum_longitude":282.9901},"karana":{"half_tithi_index":11,"name":"Taitila"},"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":1990,"month":2,"day":1,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2447923.770833,"ahargana":1859458.2708,"kali_year":5091,"ayanamsa_lahiri":23.7145,"grahas":{"sun":{"sidereal_longitude":288.196768,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":3},"retrograde":false},"moon":{"sidereal_longitude":355.330368,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":3},"retrograde":false,"latitude":3.8068},"mars":{"sidereal_longitude":248.192268,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":19,"name":"Mūla","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":263.132468,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":3},"retrograde":false},"jupiter":{"sidereal_longitude":68.17956800000002,"rashi":{"number":3,"name":"Mithuna"},"nakshatra":{"number":6,"name":"Ārdrā","pada":1},"retrograde":true},"venus":{"sidereal_longitude":268.27766799999995,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":1},"retrograde":false},"saturn":{"sidereal_longitude":265.28086800000005,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":20,"name":"Pūrva Āṣāḍhā","pada":4},"retrograde":false},"rahu":{"sidereal_longitude":296.9525,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":116.9525,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","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":1990,"month":2,"day":1,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2447923.770833,"kali_year":5091,"ahargana":1859458.2708,"sun":{"sidereal_longitude":288.2369,"rashi":10,"rashi_name":"Makara"},"moon":{"sidereal_longitude":354.7533,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":6,"name":"Ṣaṣṭhī","paksha":"Śukla","full_name":"Śukla Ṣaṣṭhī","elongation_degrees":66.5164,"elapsed_within_tithi_degrees":6.5164},"nakshatra":{"number":27,"name":"Revatī","pada":3,"moon_longitude":354.7533,"elapsed_within_degrees":8.0866},"yoga":{"number":22,"name":"Sādhya","sum_longitude":282.9901},"karana":{"half_tithi_index":11,"name":"Taitila"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":3.807,"elongation":66.516},"lunar":{"type":"lunar","occurs":false,"moon_latitude":3.807,"opposition_distance":113.484}},"eclipse_window_40days":[{"offset_days":-5,"type":"solar","occurs":true,"moon_latitude":-0.956,"elongation":1.82}]},"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":"05:41","sunsetLocal":"19:19","solarNoonLocal":"12:30","dayLengthHours":13.62563726524952,"dayLengthDisplay":"13 Hours 37 Mins 32 Secs","nightLengthDisplay":"10 Hours 22 Mins 28 Secs","moonriseLocal":"11:15","moonsetLocal":"22:43","rahuKala":{"name":"Rāhu Kāla","start":"14:12","end":"15:55","startHours":14.20732712677945,"endHours":15.910531784935639,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"05:41","end":"07:24","startHours":5.691303835998501,"endHours":7.394508494154691,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"09:06","end":"10:48","startHours":9.097713152310881,"endHours":10.80091781046707,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:52","end":"09:19","startHours":8.870619197890056,"endHours":9.324807106731706,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:16","end":"06:37","startHours":6.2590387220505646,"endHours":6.6223890491238855,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:03","end":"12:57","startHours":12.04993455978161,"endHours":12.95831037746491,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:52","end":"04:47","startHours":3.874552200631898,"endHours":4.7829280183152,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:33","end":"05:41","startHours":4.555834063894374,"endHours":5.691303835998501,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:47","end":"15:41","startHours":14.775062012831516,"endHours":15.683437830514817,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"19:07","end":"19:31","startHours":19.11694110124802,"endHours":19.51694110124802,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"19:19","end":"19:53","startHours":19.31694110124802,"endHours":19.88467598730008,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"19:04","end":"20:49","startHours":19.06694110124802,"endHours":20.81694110124802,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:03","end":"00:57","startHours":24.049934559781608,"endHours":24.958310377464908,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Śubha","start":"05:41","end":"07:24","startHours":5.691303835998501,"endHours":7.394508494154691,"quality":"auspicious"},{"name":"Roga","start":"07:24","end":"09:06","startHours":7.394508494154691,"endHours":9.097713152310881,"quality":"inauspicious"},{"name":"Udveg","start":"09:06","end":"10:48","startHours":9.097713152310881,"endHours":10.80091781046707,"quality":"inauspicious"},{"name":"Chala","start":"10:48","end":"12:30","startHours":10.80091781046707,"endHours":12.504122468623262,"quality":"neutral"},{"name":"Labha","start":"12:30","end":"14:12","startHours":12.504122468623262,"endHours":14.20732712677945,"quality":"auspicious"},{"name":"Amṛta","start":"14:12","end":"15:55","startHours":14.20732712677945,"endHours":15.910531784935639,"quality":"auspicious"},{"name":"Kāla","start":"15:55","end":"17:37","startHours":15.910531784935639,"endHours":17.61373644309183,"quality":"inauspicious"},{"name":"Śubha","start":"17:37","end":"19:19","startHours":17.61373644309183,"endHours":19.31694110124802,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Amṛta","start":"19:19","end":"20:37","startHours":19.31694110124802,"endHours":20.61373644309183,"quality":"auspicious"},{"name":"Kāla","start":"20:37","end":"21:55","startHours":20.61373644309183,"endHours":21.91053178493564,"quality":"inauspicious"},{"name":"Śubha","start":"21:55","end":"23:12","startHours":21.91053178493564,"endHours":23.20732712677945,"quality":"auspicious"},{"name":"Roga","start":"23:12","end":"00:30","startHours":23.20732712677945,"endHours":24.504122468623258,"quality":"inauspicious"},{"name":"Udveg","start":"00:30","end":"01:48","startHours":24.504122468623258,"endHours":25.80091781046707,"quality":"inauspicious"},{"name":"Chala","start":"01:48","end":"03:06","startHours":25.80091781046707,"endHours":27.09771315231088,"quality":"neutral"},{"name":"Labha","start":"03:06","end":"04:24","startHours":27.09771315231088,"endHours":28.394508494154692,"quality":"auspicious"},{"name":"Amṛta","start":"04:24","end":"05:41","startHours":28.394508494154692,"endHours":29.6913038359985,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"05:41","end":"06:41","startHours":5.691303835998501,"endHours":6.691303835998501,"planetary_lord":"Jupiter"},{"name":"Hora 2","start":"06:41","end":"07:41","startHours":6.691303835998501,"endHours":7.691303835998501,"planetary_lord":"Saturn"},{"name":"Hora 3","start":"07:41","end":"08:41","startHours":7.691303835998501,"endHours":8.6913038359985,"planetary_lord":"Moon"},{"name":"Hora 4","start":"08:41","end":"09:41","startHours":8.6913038359985,"endHours":9.6913038359985,"planetary_lord":"Mercury"},{"name":"Hora 5","start":"09:41","end":"10:41","startHours":9.6913038359985,"endHours":10.6913038359985,"planetary_lord":"Venus"},{"name":"Hora 6","start":"10:41","end":"11:41","startHours":10.6913038359985,"endHours":11.6913038359985,"planetary_lord":"Sun"},{"name":"Hora 7","start":"11:41","end":"12:41","startHours":11.6913038359985,"endHours":12.6913038359985,"planetary_lord":"Mars"},{"name":"Hora 8","start":"12:41","end":"13:41","startHours":12.6913038359985,"endHours":13.6913038359985,"planetary_lord":"Jupiter"},{"name":"Hora 9","start":"13:41","end":"14:41","startHours":13.6913038359985,"endHours":14.6913038359985,"planetary_lord":"Saturn"},{"name":"Hora 10","start":"14:41","end":"15:41","startHours":14.6913038359985,"endHours":15.6913038359985,"planetary_lord":"Moon"},{"name":"Hora 11","start":"15:41","end":"16:41","startHours":15.6913038359985,"endHours":16.6913038359985,"planetary_lord":"Mercury"},{"name":"Hora 12","start":"16:41","end":"17:41","startHours":16.6913038359985,"endHours":17.6913038359985,"planetary_lord":"Venus"},{"name":"Hora 13","start":"17:41","end":"18:41","startHours":17.6913038359985,"endHours":18.6913038359985,"planetary_lord":"Sun"},{"name":"Hora 14","start":"18:41","end":"19:41","startHours":18.6913038359985,"endHours":19.6913038359985,"planetary_lord":"Mars"},{"name":"Hora 15","start":"19:41","end":"20:41","startHours":19.6913038359985,"endHours":20.6913038359985,"planetary_lord":"Jupiter"},{"name":"Hora 16","start":"20:41","end":"21:41","startHours":20.6913038359985,"endHours":21.6913038359985,"planetary_lord":"Saturn"},{"name":"Hora 17","start":"21:41","end":"22:41","startHours":21.6913038359985,"endHours":22.6913038359985,"planetary_lord":"Moon"},{"name":"Hora 18","start":"22:41","end":"23:41","startHours":22.6913038359985,"endHours":23.6913038359985,"planetary_lord":"Mercury"},{"name":"Hora 19","start":"23:41","end":"00:41","startHours":23.6913038359985,"endHours":24.6913038359985,"planetary_lord":"Venus"},{"name":"Hora 20","start":"00:41","end":"01:41","startHours":24.6913038359985,"endHours":25.6913038359985,"planetary_lord":"Sun"},{"name":"Hora 21","start":"01:41","end":"02:41","startHours":25.6913038359985,"endHours":26.6913038359985,"planetary_lord":"Mars"},{"name":"Hora 22","start":"02:41","end":"03:41","startHours":26.6913038359985,"endHours":27.6913038359985,"planetary_lord":"Jupiter"},{"name":"Hora 23","start":"03:41","end":"04:41","startHours":27.6913038359985,"endHours":28.6913038359985,"planetary_lord":"Saturn"},{"name":"Hora 24","start":"04:41","end":"05:41","startHours":28.6913038359985,"endHours":29.6913038359985,"planetary_lord":"Moon"}],"taraBala":{"favorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Rohiṇī","Mṛgaśirā","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Citrā","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa","Dhaniṣṭhā"],"unfavorable_nakshatras":["Ārdrā","Punarvasu","Puṣya","Aśleṣā","Svātī","Viśākhā","Anurādhā","Jyeṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"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":"South (Dakṣiṇa)","chandraVasa":"South-West","rahuVasa":"North-West","anandadiYoga":{"name":"Lumba","quality":"Auspicious"},"drikRitu":"Śiśira (Winter) (Drik)","vedicRitu":"Hemanta (Pre-winter)","drikAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":-17.216588876374775,"eotMinutes":-13.689348117395623,"ayanamsa":23.7145}},"calendars":{"vikram_samvat":2047,"vikram_samvatsara":"Subhānu","saka_samvat":1912,"saka_samvatsara":"Pramoda","bengali_samvat":1397,"malayalam_era":1166,"nanakshahi_year":521,"lunar_month":"Māgha","lunar_month_paksha_full":"Māgha Śukla Pakṣa","solar_month":"Makara (Tai)","ritu":"Śiśira (Winter)","display_summary":"Māgha Śukla Ṣaṣṭhī · Vikram 2047 Subhānu · Śaka 1912 Pramoda"},"festivals":[{"id":"makara-sankranti","name":"Makara Saṅkrānti (Uttarāyaṇa)","name_sanskrit":"मकर सङ्क्रान्ति","tradition":"Pan-Hindu","associated_deity":"Sūrya Bhagavān","significance":"Sun enters Capricorn; Uttarāyaṇa (north-going) begins. Bhīṣma's chosen mahaprasthāna time.","vrata":true,"detection":{"sun_rashi":"Makara"},"precedence":1,"sources":["Mahābhārata Bhīṣma-Stuti","Sūrya-Siddhānta"]},{"id":"pongal","name":"Pongal / Thai Pongal","name_sanskrit":"पोङ्गल","tradition":"Regional","associated_deity":"Sūrya Bhagavān","significance":"Tamil 4-day harvest festival; coincides with Makara Saṅkrānti.","vrata":false,"detection":{"sun_rashi":"Makara"},"precedence":2}],"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 February 1, 1990 CE · Perth, Australia · Vidhyamitra","description":"February 1, 1990 CE for Perth, Australia: Śukla Ṣaṣṭhī, sūryodaya 05:41, sūryāsta 19:19.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/1990-02-01","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/1990-02-01","sa":"https://sa.vidhyamitra.com/city/perth/1990-02-01","hi":"https://hi.vidhyamitra.com/city/perth/1990-02-01","x-default":"https://vidhyamitra.com/city/perth/1990-02-01"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-17T10:36:14.325Z","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":"2026-05-17T10:36:14.325Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-17T10:36:14.325Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}