{"id":"vidhyamitra:city-day:perth:-3101-02-21:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/-3101-02-21","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"-3101-02-21","date_display":"February 21, 3102 BCE","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":-3101,"month":2,"day":21,"hour":6,"minute":30,"second":0,"calendar":"julian"},"julian_day":588468.770833,"kali_year":1,"ahargana":3.2708,"sun":{"sidereal_longitude":5.4716,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":48.5644,"rashi":2,"rashi_name":"Vṛṣabha"},"tithi":{"number":4,"name":"Caturthī","paksha":"Śukla","full_name":"Śukla Caturthī","elongation_degrees":43.0927,"elapsed_within_tithi_degrees":7.0927},"nakshatra":{"number":4,"name":"Rohiṇī","pada":3,"moon_longitude":48.5644,"elapsed_within_degrees":8.5644},"yoga":{"number":5,"name":"Śobhana","sum_longitude":54.036},"karana":{"half_tithi_index":7,"name":"Viṣṭi"},"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":-3101,"month":2,"day":21,"hour":6,"minute":30,"calendar":"julian"},"julian_day":588468.770833,"ahargana":3.2708,"kali_year":1,"ayanamsa_lahiri":-47.4027,"grahas":{"sun":{"sidereal_longitude":5.4716,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":2},"retrograde":false},"moon":{"sidereal_longitude":48.5644,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":3},"retrograde":false,"latitude":-3.3811},"mars":{"sidereal_longitude":7.9089,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":3},"retrograde":false},"mercury":{"sidereal_longitude":3.9853,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":2},"retrograde":false},"jupiter":{"sidereal_longitude":2.2625,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":1},"retrograde":false},"venus":{"sidereal_longitude":5.1457,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":2},"retrograde":false},"saturn":{"sidereal_longitude":353.1924,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","pada":2},"retrograde":false},"rahu":{"sidereal_longitude":179.8267,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":14,"name":"Citrā","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":359.8267,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":27,"name":"Revatī","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":-3101,"month":2,"day":21,"hour":6,"minute":30,"second":0,"calendar":"julian"},"julian_day":588468.770833,"kali_year":1,"ahargana":3.2708,"sun":{"sidereal_longitude":5.4716,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":48.5644,"rashi":2,"rashi_name":"Vṛṣabha"},"tithi":{"number":4,"name":"Caturthī","paksha":"Śukla","full_name":"Śukla Caturthī","elongation_degrees":43.0927,"elapsed_within_tithi_degrees":7.0927},"nakshatra":{"number":4,"name":"Rohiṇī","pada":3,"moon_longitude":48.5644,"elapsed_within_degrees":8.5644},"yoga":{"number":5,"name":"Śobhana","sum_longitude":54.036},"karana":{"half_tithi_index":7,"name":"Viṣṭi"},"vara":{"number":3,"name":"Somavāra (Monday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-3.381,"elongation":43.093},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-3.381,"opposition_distance":136.907}},"eclipse_window_40days":[{"offset_days":12,"type":"lunar","occurs":true,"moon_latitude":1.238,"opposition_distance":1.931}]},"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":"05:47","sunsetLocal":"19:14","solarNoonLocal":"12:31","dayLengthHours":13.458156210792556,"dayLengthDisplay":"13 Hours 27 Mins 29 Secs","nightLengthDisplay":"10 Hours 32 Mins 31 Secs","moonriseLocal":"09:22","moonsetLocal":"21:25","rahuKala":{"name":"Rāhu Kāla","start":"07:28","end":"09:09","startHours":7.465655459973396,"endHours":9.147924986322465,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"10:50","end":"12:31","startHours":10.830194512671536,"endHours":12.512464039020603,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"14:12","end":"15:53","startHours":14.194733565369674,"endHours":15.877003091718745,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"08:55","end":"09:22","startHours":8.923622382809256,"endHours":9.372227589835674,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"06:21","end":"06:42","startHours":6.34414244240735,"endHours":6.703026608028485,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:04","end":"12:58","startHours":12.063858831994187,"endHours":12.961069246047023,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"03:59","end":"04:53","startHours":3.988965105518652,"endHours":4.8861755195714895,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"04:40","end":"05:47","startHours":4.66187291605828,"endHours":5.783385933624326,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:45","end":"15:39","startHours":14.755490074152696,"endHours":15.652700488205534,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"19:02","end":"19:26","startHours":19.041542144416884,"endHours":19.441542144416882,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"19:14","end":"19:48","startHours":19.241542144416883,"endHours":19.802298653199905,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"18:59","end":"20:44","startHours":18.991542144416883,"endHours":20.741542144416883,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:04","end":"00:58","startHours":24.06385883199419,"endHours":24.961069246047025,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Amṛta","start":"05:47","end":"07:28","startHours":5.783385933624326,"endHours":7.465655459973396,"quality":"auspicious"},{"name":"Kāla","start":"07:28","end":"09:09","startHours":7.465655459973396,"endHours":9.147924986322465,"quality":"inauspicious"},{"name":"Śubha","start":"09:09","end":"10:50","startHours":9.147924986322465,"endHours":10.830194512671536,"quality":"auspicious"},{"name":"Roga","start":"10:50","end":"12:31","startHours":10.830194512671536,"endHours":12.512464039020603,"quality":"inauspicious"},{"name":"Udveg","start":"12:31","end":"14:12","startHours":12.512464039020603,"endHours":14.194733565369674,"quality":"inauspicious"},{"name":"Chala","start":"14:12","end":"15:53","startHours":14.194733565369674,"endHours":15.877003091718745,"quality":"neutral"},{"name":"Labha","start":"15:53","end":"17:34","startHours":15.877003091718745,"endHours":17.559272618067812,"quality":"auspicious"},{"name":"Amṛta","start":"17:34","end":"19:14","startHours":17.559272618067812,"endHours":19.241542144416883,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Chala","start":"19:14","end":"20:34","startHours":19.241542144416883,"endHours":20.559272618067812,"quality":"neutral"},{"name":"Labha","start":"20:34","end":"21:53","startHours":20.559272618067812,"endHours":21.877003091718745,"quality":"auspicious"},{"name":"Amṛta","start":"21:53","end":"23:12","startHours":21.877003091718745,"endHours":23.194733565369674,"quality":"auspicious"},{"name":"Kāla","start":"23:12","end":"00:31","startHours":23.194733565369674,"endHours":24.512464039020607,"quality":"inauspicious"},{"name":"Śubha","start":"00:31","end":"01:50","startHours":24.512464039020607,"endHours":25.830194512671536,"quality":"auspicious"},{"name":"Roga","start":"01:50","end":"03:09","startHours":25.830194512671536,"endHours":27.147924986322465,"quality":"inauspicious"},{"name":"Udveg","start":"03:09","end":"04:28","startHours":27.147924986322465,"endHours":28.465655459973398,"quality":"inauspicious"},{"name":"Chala","start":"04:28","end":"05:47","startHours":28.465655459973398,"endHours":29.783385933624327,"quality":"neutral"}],"horas":[{"name":"Hora 1","start":"05:47","end":"06:47","startHours":5.783385933624326,"endHours":6.783385933624326,"planetary_lord":"Moon"},{"name":"Hora 2","start":"06:47","end":"07:47","startHours":6.783385933624326,"endHours":7.783385933624326,"planetary_lord":"Mercury"},{"name":"Hora 3","start":"07:47","end":"08:47","startHours":7.783385933624326,"endHours":8.783385933624327,"planetary_lord":"Venus"},{"name":"Hora 4","start":"08:47","end":"09:47","startHours":8.783385933624327,"endHours":9.783385933624327,"planetary_lord":"Sun"},{"name":"Hora 5","start":"09:47","end":"10:47","startHours":9.783385933624327,"endHours":10.783385933624327,"planetary_lord":"Mars"},{"name":"Hora 6","start":"10:47","end":"11:47","startHours":10.783385933624327,"endHours":11.783385933624327,"planetary_lord":"Jupiter"},{"name":"Hora 7","start":"11:47","end":"12:47","startHours":11.783385933624327,"endHours":12.783385933624327,"planetary_lord":"Saturn"},{"name":"Hora 8","start":"12:47","end":"13:47","startHours":12.783385933624327,"endHours":13.783385933624327,"planetary_lord":"Moon"},{"name":"Hora 9","start":"13:47","end":"14:47","startHours":13.783385933624327,"endHours":14.783385933624327,"planetary_lord":"Mercury"},{"name":"Hora 10","start":"14:47","end":"15:47","startHours":14.783385933624327,"endHours":15.783385933624327,"planetary_lord":"Venus"},{"name":"Hora 11","start":"15:47","end":"16:47","startHours":15.783385933624327,"endHours":16.783385933624327,"planetary_lord":"Sun"},{"name":"Hora 12","start":"16:47","end":"17:47","startHours":16.783385933624327,"endHours":17.783385933624327,"planetary_lord":"Mars"},{"name":"Hora 13","start":"17:47","end":"18:47","startHours":17.783385933624327,"endHours":18.783385933624327,"planetary_lord":"Jupiter"},{"name":"Hora 14","start":"18:47","end":"19:47","startHours":18.783385933624327,"endHours":19.783385933624327,"planetary_lord":"Saturn"},{"name":"Hora 15","start":"19:47","end":"20:47","startHours":19.783385933624327,"endHours":20.783385933624327,"planetary_lord":"Moon"},{"name":"Hora 16","start":"20:47","end":"21:47","startHours":20.783385933624327,"endHours":21.783385933624327,"planetary_lord":"Mercury"},{"name":"Hora 17","start":"21:47","end":"22:47","startHours":21.783385933624327,"endHours":22.783385933624327,"planetary_lord":"Venus"},{"name":"Hora 18","start":"22:47","end":"23:47","startHours":22.783385933624327,"endHours":23.783385933624327,"planetary_lord":"Sun"},{"name":"Hora 19","start":"23:47","end":"00:47","startHours":23.783385933624327,"endHours":24.783385933624327,"planetary_lord":"Mars"},{"name":"Hora 20","start":"00:47","end":"01:47","startHours":24.783385933624327,"endHours":25.783385933624327,"planetary_lord":"Jupiter"},{"name":"Hora 21","start":"01:47","end":"02:47","startHours":25.783385933624327,"endHours":26.783385933624327,"planetary_lord":"Saturn"},{"name":"Hora 22","start":"02:47","end":"03:47","startHours":26.783385933624327,"endHours":27.783385933624327,"planetary_lord":"Moon"},{"name":"Hora 23","start":"03:47","end":"04:47","startHours":27.783385933624327,"endHours":28.783385933624327,"planetary_lord":"Mercury"},{"name":"Hora 24","start":"04:47","end":"05:47","startHours":28.783385933624327,"endHours":29.783385933624327,"planetary_lord":"Venus"}],"taraBala":{"favorable_nakshatras":["Mṛgaśirā","Ārdrā","Punarvasu","Puṣya","Aśleṣā","Citrā","Svātī","Viśākhā","Anurādhā","Jyeṣṭhā","Dhaniṣṭhā","Śatabhiṣaj","Pūrva Bhādrapadā","Uttara Bhādrapadā","Revatī"],"unfavorable_nakshatras":["Aśvinī","Bharaṇī","Kṛttikā","Rohiṇī","Maghā","Pūrva Phalgunī","Uttara Phalgunī","Hasta","Mūla","Pūrva Āṣāḍhā","Uttara Āṣāḍhā","Śravaṇa"],"nature":"Janma-tara if same nakshatra; favorable for 15 nakshatras"},"chandraBala":{"favorable_rashis":["Vṛṣabha","Karka","Tulā","Vṛścika","Kumbha","Mīna"],"unfavorable_rashis":["Meṣa","Mithuna","Siṃha","Kanyā","Dhanu","Makara"]},"dishaShool":"East (Pūrva)","chandraVasa":"South-East","rahuVasa":"North-East","anandadiYoga":{"name":"Śrīvatsa","quality":"Auspicious"},"drikRitu":"undefined (Drik)","vedicRitu":"Vasanta (Spring)","drikAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization (Drikpanchang-parity)","declination":-15.413266135210309,"eotMinutes":-14.189842341236304,"ayanamsa":-47.4027}},"calendars":{"vikram_samvat":-3044,"saka_samvat":-3179,"bengali_samvat":-3694,"malayalam_era":-3925,"nanakshahi_year":-4570,"lunar_month":"Vaiśākha","lunar_month_paksha_full":"Vaiśākha Śukla Pakṣa","solar_month":"Mēsha (Cittirai / Vaiśākhī)","ritu":"Vasanta (Spring)","display_summary":"Vaiśākha Śukla Caturthī · Vikram -3044 undefined · Śaka -3179 undefined"},"festivals":[{"id":"mesha-sankranti","name":"Meṣa Saṅkrānti (Vaiśākhī / Vishu / Pohelā Boishākh / Bihu)","name_sanskrit":"मेष सङ्क्रान्ति","tradition":"Pan-Hindu","associated_deity":"Sūrya Bhagavān","significance":"Sun enters Aries; solar new year. Regional: Vaiśākhī (Punjab) · Vishu (Kerala) · Pohelā Boishākh (Bengal) · Bihu (Assam) · Tamil Puthāṇḍu.","vrata":false,"detection":{"sun_rashi":"Meṣa"},"precedence":1},{"id":"baisakhi","name":"Baisakhi (Vaiśākhī)","name_sanskrit":"वैशाखी","tradition":"Regional","associated_deity":"Sūrya + Khalsa Pantha (Sikh)","significance":"Punjab New Year + Sikh Khalsa founding day.","vrata":false,"detection":{"sun_rashi":"Meṣa"},"precedence":2},{"id":"vinayaka-chaturthi","name":"Vināyaka Caturthī (monthly)","name_sanskrit":"विनायक चतुर्थी","tradition":"Pan-Hindu","associated_deity":"Gaṇeśa","significance":"Monthly Śukla-pakṣa Caturthī; auspicious for new ventures.","vrata":true,"detection":{"tithi_number":4,"tithi_paksha":"Śukla"},"precedence":6}],"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":[{"historical_date":"-3226-07-09","event":"Bhagavān Krishna's birth at Mathurā","chart_id":"krishna","shared_marker":"same Rohiṇī","url":"/day/-3226-07-09","relevance":0.5}]},"validity":{"eternal":true,"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 21, 3102 BCE · Perth, Australia · Vidhyamitra","description":"February 21, 3102 BCE for Perth, Australia: Śukla Caturthī, sūryodaya 05:47, sūryāsta 19:14.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/-3101-02-21","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/-3101-02-21","sa":"https://sa.vidhyamitra.com/city/perth/-3101-02-21","hi":"https://hi.vidhyamitra.com/city/perth/-3101-02-21","x-default":"https://vidhyamitra.com/city/perth/-3101-02-21"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-14T20:32:54.396Z","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":"2026-05-14T20:32:54.396Z","verification":{"type":"community-validated","markers":["matches Drikpanchang ±1 minute on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-14T20:32:54.396Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}