{"id":"vidhyamitra:city-day:perth:2137-04-18:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/perth/2137-04-18","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"2137-04-18","date_display":"April 18, 2137 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":2137,"month":4,"day":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2501690.770833,"kali_year":5238,"ahargana":1913225.2708,"sun":{"sidereal_longitude":2.1929,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":335.5723,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":28,"name":"Trayodaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Trayodaśī","elongation_degrees":333.3794,"elapsed_within_tithi_degrees":9.3794},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":1,"moon_longitude":335.5723,"elapsed_within_degrees":2.239},"yoga":{"number":26,"name":"Indra","sum_longitude":337.7652},"karana":{"half_tithi_index":55,"name":"Vaṇija"},"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":2137,"month":4,"day":18,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2501690.770833,"ahargana":1913225.2708,"kali_year":5238,"ayanamsa_lahiri":25.7709,"grahas":{"sun":{"sidereal_longitude":2.386973000000012,"rashi":{"number":1,"name":"Meṣa"},"nakshatra":{"number":1,"name":"Aśvinī","pada":1},"retrograde":false},"moon":{"sidereal_longitude":335.076173,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":1},"retrograde":false,"latitude":0.5832},"mars":{"sidereal_longitude":343.347573,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":4},"retrograde":false},"mercury":{"sidereal_longitude":333.036473,"rashi":{"number":12,"name":"Mīna"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":4},"retrograde":false},"jupiter":{"sidereal_longitude":217.94517299999995,"rashi":{"number":8,"name":"Vṛścika"},"nakshatra":{"number":17,"name":"Anurādhā","pada":2},"retrograde":true},"venus":{"sidereal_longitude":314.800873,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":267.26957300000004,"rashi":{"number":9,"name":"Dhanu"},"nakshatra":{"number":21,"name":"Uttara Āṣāḍhā","pada":1},"retrograde":false},"rahu":{"sidereal_longitude":328.1181,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":25,"name":"Pūrva Bhādrapadā","pada":3},"retrograde":false},"ketu":{"sidereal_longitude":148.1181,"rashi":{"number":5,"name":"Siṃha"},"nakshatra":{"number":12,"name":"Uttara Phalgunī","pada":1},"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":2137,"month":4,"day":18,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2501690.770833,"kali_year":5238,"ahargana":1913225.2708,"sun":{"sidereal_longitude":2.1929,"rashi":1,"rashi_name":"Meṣa"},"moon":{"sidereal_longitude":335.5723,"rashi":12,"rashi_name":"Mīna"},"tithi":{"number":28,"name":"Trayodaśī","paksha":"Kṛṣṇa","full_name":"Kṛṣṇa Trayodaśī","elongation_degrees":333.3794,"elapsed_within_tithi_degrees":9.3794},"nakshatra":{"number":26,"name":"Uttara Bhādrapadā","pada":1,"moon_longitude":335.5723,"elapsed_within_degrees":2.239},"yoga":{"number":26,"name":"Indra","sum_longitude":337.7652},"karana":{"half_tithi_index":55,"name":"Vaṇija"},"vara":{"number":6,"name":"Guruvāra (Thursday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":0.583,"elongation":26.621},"lunar":{"type":"lunar","occurs":false,"moon_latitude":0.583,"opposition_distance":153.379}},"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":11.221483949364316,"dayLengthDisplay":"11 Hours 13 Mins 17 Secs","nightLengthDisplay":"12 Hours 46 Mins 43 Secs","moonriseLocal":"04:25","moonsetLocal":"16:29","rahuKala":{"name":"Rāhu Kāla","start":"13:40","end":"15:04","startHours":13.67022077873915,"endHours":15.07290627240969,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"06:39","end":"08:04","startHours":6.656793310386452,"endHours":8.059478804056992,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"09:28","end":"10:52","startHours":9.462164297727531,"endHours":10.864849791398072,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:17","end":"09:39","startHours":9.275139565238126,"endHours":9.649189030216936,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:07","end":"07:25","startHours":7.124355141609965,"endHours":7.423594713593014,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"11:54","end":"12:38","startHours":11.893485820089799,"endHours":12.64158475004742,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:10","end":"05:55","startHours":5.1605954504712095,"endHours":5.908694380428831,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"05:43","end":"06:39","startHours":5.721669647939426,"endHours":6.656793310386452,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:08","end":"14:53","startHours":14.137782609962663,"endHours":14.885881539920284,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:41","end":"18:05","startHours":17.678277259750768,"endHours":18.078277259750767,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"17:53","end":"18:21","startHours":17.878277259750767,"endHours":18.34583909097428,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:38","end":"19:23","startHours":17.628277259750767,"endHours":19.378277259750767,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"23:54","end":"00:38","startHours":23.8934858200898,"endHours":24.64158475004742,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Śubha","start":"06:39","end":"08:04","startHours":6.656793310386452,"endHours":8.059478804056992,"quality":"auspicious"},{"name":"Roga","start":"08:04","end":"09:28","startHours":8.059478804056992,"endHours":9.462164297727531,"quality":"inauspicious"},{"name":"Udveg","start":"09:28","end":"10:52","startHours":9.462164297727531,"endHours":10.864849791398072,"quality":"inauspicious"},{"name":"Chala","start":"10:52","end":"12:16","startHours":10.864849791398072,"endHours":12.267535285068611,"quality":"neutral"},{"name":"Labha","start":"12:16","end":"13:40","startHours":12.267535285068611,"endHours":13.67022077873915,"quality":"auspicious"},{"name":"Amṛta","start":"13:40","end":"15:04","startHours":13.67022077873915,"endHours":15.07290627240969,"quality":"auspicious"},{"name":"Kāla","start":"15:04","end":"16:29","startHours":15.07290627240969,"endHours":16.47559176608023,"quality":"inauspicious"},{"name":"Śubha","start":"16:29","end":"17:53","startHours":16.47559176608023,"endHours":17.878277259750767,"quality":"auspicious"}],"nightChoghadiyas":[{"name":"Amṛta","start":"17:53","end":"19:29","startHours":17.878277259750767,"endHours":19.47559176608023,"quality":"auspicious"},{"name":"Kāla","start":"19:29","end":"21:04","startHours":19.47559176608023,"endHours":21.07290627240969,"quality":"inauspicious"},{"name":"Śubha","start":"21:04","end":"22:40","startHours":21.07290627240969,"endHours":22.67022077873915,"quality":"auspicious"},{"name":"Roga","start":"22:40","end":"00:16","startHours":22.67022077873915,"endHours":24.26753528506861,"quality":"inauspicious"},{"name":"Udveg","start":"00:16","end":"01:52","startHours":24.26753528506861,"endHours":25.864849791398072,"quality":"inauspicious"},{"name":"Chala","start":"01:52","end":"03:28","startHours":25.864849791398072,"endHours":27.46216429772753,"quality":"neutral"},{"name":"Labha","start":"03:28","end":"05:04","startHours":27.46216429772753,"endHours":29.05947880405699,"quality":"auspicious"},{"name":"Amṛta","start":"05:04","end":"06:39","startHours":29.05947880405699,"endHours":30.65679331038645,"quality":"auspicious"}],"horas":[{"name":"Hora 1","start":"06:39","end":"07:39","startHours":6.656793310386452,"endHours":7.656793310386452,"planetary_lord":"Jupiter"},{"name":"Hora 2","start":"07:39","end":"08:39","startHours":7.656793310386452,"endHours":8.656793310386451,"planetary_lord":"Saturn"},{"name":"Hora 3","start":"08:39","end":"09:39","startHours":8.656793310386451,"endHours":9.656793310386451,"planetary_lord":"Moon"},{"name":"Hora 4","start":"09:39","end":"10:39","startHours":9.656793310386451,"endHours":10.656793310386451,"planetary_lord":"Mercury"},{"name":"Hora 5","start":"10:39","end":"11:39","startHours":10.656793310386451,"endHours":11.656793310386451,"planetary_lord":"Venus"},{"name":"Hora 6","start":"11:39","end":"12:39","startHours":11.656793310386451,"endHours":12.656793310386451,"planetary_lord":"Sun"},{"name":"Hora 7","start":"12:39","end":"13:39","startHours":12.656793310386451,"endHours":13.656793310386451,"planetary_lord":"Mars"},{"name":"Hora 8","start":"13:39","end":"14:39","startHours":13.656793310386451,"endHours":14.656793310386451,"planetary_lord":"Jupiter"},{"name":"Hora 9","start":"14:39","end":"15:39","startHours":14.656793310386451,"endHours":15.656793310386451,"planetary_lord":"Saturn"},{"name":"Hora 10","start":"15:39","end":"16:39","startHours":15.656793310386451,"endHours":16.65679331038645,"planetary_lord":"Moon"},{"name":"Hora 11","start":"16:39","end":"17:39","startHours":16.65679331038645,"endHours":17.65679331038645,"planetary_lord":"Mercury"},{"name":"Hora 12","start":"17:39","end":"18:39","startHours":17.65679331038645,"endHours":18.65679331038645,"planetary_lord":"Venus"},{"name":"Hora 13","start":"18:39","end":"19:39","startHours":18.65679331038645,"endHours":19.65679331038645,"planetary_lord":"Sun"},{"name":"Hora 14","start":"19:39","end":"20:39","startHours":19.65679331038645,"endHours":20.65679331038645,"planetary_lord":"Mars"},{"name":"Hora 15","start":"20:39","end":"21:39","startHours":20.65679331038645,"endHours":21.65679331038645,"planetary_lord":"Jupiter"},{"name":"Hora 16","start":"21:39","end":"22:39","startHours":21.65679331038645,"endHours":22.65679331038645,"planetary_lord":"Saturn"},{"name":"Hora 17","start":"22:39","end":"23:39","startHours":22.65679331038645,"endHours":23.65679331038645,"planetary_lord":"Moon"},{"name":"Hora 18","start":"23:39","end":"00:39","startHours":23.65679331038645,"endHours":24.65679331038645,"planetary_lord":"Mercury"},{"name":"Hora 19","start":"00:39","end":"01:39","startHours":24.65679331038645,"endHours":25.65679331038645,"planetary_lord":"Venus"},{"name":"Hora 20","start":"01:39","end":"02:39","startHours":25.65679331038645,"endHours":26.65679331038645,"planetary_lord":"Sun"},{"name":"Hora 21","start":"02:39","end":"03:39","startHours":26.65679331038645,"endHours":27.65679331038645,"planetary_lord":"Mars"},{"name":"Hora 22","start":"03:39","end":"04:39","startHours":27.65679331038645,"endHours":28.65679331038645,"planetary_lord":"Jupiter"},{"name":"Hora 23","start":"04:39","end":"05:39","startHours":28.65679331038645,"endHours":29.65679331038645,"planetary_lord":"Saturn"},{"name":"Hora 24","start":"05:39","end":"06:39","startHours":29.65679331038645,"endHours":30.65679331038645,"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":["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":"Padma","quality":"Auspicious"},"tropicalRitu":"Vasanta (Spring)","vedicRitu":"Vasanta (Spring)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":10.818064413773358,"eotMinutes":0.5058828958834352,"ayanamsa":25.7709}},"calendars":{"vikram_samvat":2194,"vikram_samvatsara":"Sādhāraṇa","saka_samvat":2059,"saka_samvatsara":"Hemalambī","bengali_samvat":1544,"malayalam_era":1313,"nanakshahi_year":668,"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 Trayodaśī · Vikram 2194 Sādhāraṇa · Śaka 2059 Hemalambī"},"festivals":[{"id":"pradosha-vrata","name":"Pradoṣa Vrata","name_sanskrit":"प्रदोष व्रत","tradition":"Shaiva","associated_deity":"Śiva","significance":"Twilight worship of Śiva on Trayodaśī.","vrata":true,"detection":{"any_of":[{"tithi_number":13},{"tithi_number":28}]},"precedence":7}],"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 April 18, 2137 CE · Perth, Australia · Vidhyamitra","description":"April 18, 2137 CE for Perth, Australia: Kṛṣṇa Trayodaśī, sūryodaya 06:39, sūryāsta 17:53.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/perth/2137-04-18","hreflang_alternates":{"en":"https://vidhyamitra.com/city/perth/2137-04-18","sa":"https://sa.vidhyamitra.com/city/perth/2137-04-18","hi":"https://hi.vidhyamitra.com/city/perth/2137-04-18","x-default":"https://vidhyamitra.com/city/perth/2137-04-18"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-06-01T03:32:08.984Z","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":"2026-06-01T03:32:08.984Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-06-01T03:32:08.984Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}