{"id":"vidhyamitra:city-day:noida:1981-02-13:en","page_class":"VM-CD-city-day","url":"https://vidhyamitra.com/city/noida/1981-02-13","language":{"target_lang":"en","base_lang":"en","quality_tier":"canonical"},"data":{"date":"1981-02-13","date_display":"February 13, 1981 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":1981,"month":2,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444648.770833,"kali_year":5082,"ahargana":1856183.2708,"sun":{"sidereal_longitude":300.7995,"rashi":11,"rashi_name":"Kumbha"},"moon":{"sidereal_longitude":46.9078,"rashi":2,"rashi_name":"Vṛṣabha"},"tithi":{"number":9,"name":"Navamī","paksha":"Śukla","full_name":"Śukla Navamī","elongation_degrees":106.1083,"elapsed_within_tithi_degrees":10.1083},"nakshatra":{"number":4,"name":"Rohiṇī","pada":3,"moon_longitude":46.9078,"elapsed_within_degrees":6.9078},"yoga":{"number":27,"name":"Vaidhṛti","sum_longitude":347.7073},"karana":{"half_tithi_index":17,"name":"Kaulava"},"vara":{"number":0,"name":"Śukravāra (Friday)"}},"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":1981,"month":2,"day":13,"hour":6,"minute":30,"calendar":"gregorian"},"julian_day":2444648.770833,"ahargana":1856183.2708,"kali_year":5082,"ayanamsa_lahiri":23.5892,"grahas":{"sun":{"sidereal_longitude":300.665397,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":23,"name":"Dhaniṣṭhā","pada":3},"retrograde":false},"moon":{"sidereal_longitude":47.53159699999998,"rashi":{"number":2,"name":"Vṛṣabha"},"nakshatra":{"number":4,"name":"Rohiṇī","pada":3},"retrograde":false,"latitude":-4.0288},"mars":{"sidereal_longitude":311.520397,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":2},"retrograde":false},"mercury":{"sidereal_longitude":309.857297,"rashi":{"number":11,"name":"Kumbha"},"nakshatra":{"number":24,"name":"Śatabhiṣā","pada":1},"retrograde":true},"jupiter":{"sidereal_longitude":166.274897,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":true},"venus":{"sidereal_longitude":287.696497,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","pada":3},"retrograde":false},"saturn":{"sidereal_longitude":165.41189699999995,"rashi":{"number":6,"name":"Kanyā"},"nakshatra":{"number":13,"name":"Hasta","pada":2},"retrograde":true},"rahu":{"sidereal_longitude":110.4777,"rashi":{"number":4,"name":"Karka"},"nakshatra":{"number":9,"name":"Āśleṣā","pada":2},"retrograde":false},"ketu":{"sidereal_longitude":290.4777,"rashi":{"number":10,"name":"Makara"},"nakshatra":{"number":22,"name":"Śravaṇa","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":1981,"month":2,"day":13,"hour":6,"minute":30,"second":0,"calendar":"gregorian"},"julian_day":2444648.770833,"kali_year":5082,"ahargana":1856183.2708,"sun":{"sidereal_longitude":300.7995,"rashi":11,"rashi_name":"Kumbha"},"moon":{"sidereal_longitude":46.9078,"rashi":2,"rashi_name":"Vṛṣabha"},"tithi":{"number":9,"name":"Navamī","paksha":"Śukla","full_name":"Śukla Navamī","elongation_degrees":106.1083,"elapsed_within_tithi_degrees":10.1083},"nakshatra":{"number":4,"name":"Rohiṇī","pada":3,"moon_longitude":46.9078,"elapsed_within_degrees":6.9078},"yoga":{"number":27,"name":"Vaidhṛti","sum_longitude":347.7073},"karana":{"half_tithi_index":17,"name":"Kaulava"},"vara":{"number":0,"name":"Śukravāra (Friday)"}},"eclipse_current":{"solar":{"type":"solar","occurs":false,"moon_latitude":-4.029,"elongation":106.108},"lunar":{"type":"lunar","occurs":false,"moon_latitude":-4.029,"opposition_distance":73.892}},"eclipse_window_40days":[{"offset_days":-8,"type":"solar","occurs":true,"moon_latitude":-0.15,"elongation":0.162}]},"city":{"slug":"noida","name":"Noida, Uttar Pradesh","lat":28.5355,"lon":77.391,"tz_offset_hours":5.5,"state":"Uttar Pradesh","country":"IN","tier":"tier-1"},"tier2":{"city":{"slug":"noida","name":"Noida, Uttar Pradesh","lat":28.5355,"lon":77.391,"tz_offset_hours":5.5,"state":"Uttar Pradesh","country":"IN","tier":"tier-1"},"sunriseLocal":"07:01","sunsetLocal":"18:09","solarNoonLocal":"12:35","dayLengthHours":11.135797396376738,"dayLengthDisplay":"11 Hours 08 Mins 09 Secs","nightLengthDisplay":"12 Hours 51 Mins 51 Secs","moonriseLocal":"12:49","moonsetLocal":"02:36","rahuKala":{"name":"Rāhu Kāla","start":"11:12","end":"12:35","startHours":11.191950746463275,"endHours":12.583925421010367,"quality":"inauspicious"},"yamaganda":{"name":"Yamaganda","start":"15:22","end":"16:46","startHours":15.367874770104553,"endHours":16.759849444651643,"quality":"inauspicious"},"gulika":{"name":"Gulika Kāla","start":"08:24","end":"09:48","startHours":8.408001397369091,"endHours":9.799976071916184,"quality":"inauspicious"},"durMuhurta":[{"name":"Dur Muhūrta","start":"09:37","end":"09:59","startHours":9.614379448643238,"endHours":9.985572695189129,"quality":"avoid"}],"varjyam":{"name":"Varjyam","start":"07:29","end":"07:47","startHours":7.480018281004363,"endHours":7.776972878241076,"quality":"avoid"},"abhijit":{"name":"Abhijit Muhūrta","start":"12:13","end":"12:57","startHours":12.212732174464476,"endHours":12.955118667556258,"quality":"auspicious"},"brahmaMuhurta":{"name":"Brahma Muhūrta","start":"05:32","end":"06:16","startHours":5.531253736638433,"endHours":6.2736402297302165,"quality":"auspicious"},"pratahSandhya":{"name":"Prātaḥ Sandhyā","start":"06:05","end":"07:01","startHours":6.088043606457271,"endHours":7.016026722821999,"quality":"auspicious"},"vijayaMuhurta":{"name":"Vijaya Muhūrta","start":"14:26","end":"15:11","startHours":14.439891653739824,"endHours":15.182278146831607,"quality":"auspicious"},"godhuliMuhurta":{"name":"Godhūli Muhūrta","start":"17:57","end":"18:21","startHours":17.951824119198736,"endHours":18.351824119198735,"quality":"auspicious"},"sayahnaSandhya":{"name":"Sāyāhna Sandhyā","start":"18:09","end":"18:37","startHours":18.151824119198736,"endHours":18.6158156773811,"quality":"auspicious"},"amritKala":{"name":"Amṛta Kāla","start":"17:54","end":"19:39","startHours":17.901824119198736,"endHours":19.651824119198736,"quality":"auspicious"},"nishitaMuhurta":{"name":"Niśīta Muhūrta","start":"00:13","end":"00:57","startHours":24.212732174464474,"endHours":24.95511866755626,"quality":"auspicious"},"dayChoghadiyas":[{"name":"Chala","start":"07:01","end":"08:24","startHours":7.016026722821999,"endHours":8.408001397369091,"quality":"neutral"},{"name":"Labha","start":"08:24","end":"09:48","startHours":8.408001397369091,"endHours":9.799976071916184,"quality":"auspicious"},{"name":"Amṛta","start":"09:48","end":"11:12","startHours":9.799976071916184,"endHours":11.191950746463275,"quality":"auspicious"},{"name":"Kāla","start":"11:12","end":"12:35","startHours":11.191950746463275,"endHours":12.583925421010367,"quality":"inauspicious"},{"name":"Śubha","start":"12:35","end":"13:59","startHours":12.583925421010367,"endHours":13.97590009555746,"quality":"auspicious"},{"name":"Roga","start":"13:59","end":"15:22","startHours":13.97590009555746,"endHours":15.367874770104553,"quality":"inauspicious"},{"name":"Udveg","start":"15:22","end":"16:46","startHours":15.367874770104553,"endHours":16.759849444651643,"quality":"inauspicious"},{"name":"Chala","start":"16:46","end":"18:09","startHours":16.759849444651643,"endHours":18.151824119198736,"quality":"neutral"}],"nightChoghadiyas":[{"name":"Roga","start":"18:09","end":"19:46","startHours":18.151824119198736,"endHours":19.759849444651643,"quality":"inauspicious"},{"name":"Udveg","start":"19:46","end":"21:22","startHours":19.759849444651643,"endHours":21.36787477010455,"quality":"inauspicious"},{"name":"Chala","start":"21:22","end":"22:59","startHours":21.36787477010455,"endHours":22.97590009555746,"quality":"neutral"},{"name":"Labha","start":"22:59","end":"00:35","startHours":22.97590009555746,"endHours":24.583925421010367,"quality":"auspicious"},{"name":"Amṛta","start":"00:35","end":"02:12","startHours":24.583925421010367,"endHours":26.191950746463274,"quality":"auspicious"},{"name":"Kāla","start":"02:12","end":"03:48","startHours":26.191950746463274,"endHours":27.799976071916184,"quality":"inauspicious"},{"name":"Śubha","start":"03:48","end":"05:24","startHours":27.799976071916184,"endHours":29.40800139736909,"quality":"auspicious"},{"name":"Roga","start":"05:24","end":"07:01","startHours":29.40800139736909,"endHours":31.016026722821998,"quality":"inauspicious"}],"horas":[{"name":"Hora 1","start":"07:01","end":"08:01","startHours":7.016026722821999,"endHours":8.016026722821998,"planetary_lord":"Venus"},{"name":"Hora 2","start":"08:01","end":"09:01","startHours":8.016026722821998,"endHours":9.016026722821998,"planetary_lord":"Sun"},{"name":"Hora 3","start":"09:01","end":"10:01","startHours":9.016026722821998,"endHours":10.016026722821998,"planetary_lord":"Mars"},{"name":"Hora 4","start":"10:01","end":"11:01","startHours":10.016026722821998,"endHours":11.016026722821998,"planetary_lord":"Jupiter"},{"name":"Hora 5","start":"11:01","end":"12:01","startHours":11.016026722821998,"endHours":12.016026722821998,"planetary_lord":"Saturn"},{"name":"Hora 6","start":"12:01","end":"13:01","startHours":12.016026722821998,"endHours":13.016026722821998,"planetary_lord":"Moon"},{"name":"Hora 7","start":"13:01","end":"14:01","startHours":13.016026722821998,"endHours":14.016026722821998,"planetary_lord":"Mercury"},{"name":"Hora 8","start":"14:01","end":"15:01","startHours":14.016026722821998,"endHours":15.016026722821998,"planetary_lord":"Venus"},{"name":"Hora 9","start":"15:01","end":"16:01","startHours":15.016026722821998,"endHours":16.016026722821998,"planetary_lord":"Sun"},{"name":"Hora 10","start":"16:01","end":"17:01","startHours":16.016026722821998,"endHours":17.016026722821998,"planetary_lord":"Mars"},{"name":"Hora 11","start":"17:01","end":"18:01","startHours":17.016026722821998,"endHours":18.016026722821998,"planetary_lord":"Jupiter"},{"name":"Hora 12","start":"18:01","end":"19:01","startHours":18.016026722821998,"endHours":19.016026722821998,"planetary_lord":"Saturn"},{"name":"Hora 13","start":"19:01","end":"20:01","startHours":19.016026722821998,"endHours":20.016026722821998,"planetary_lord":"Moon"},{"name":"Hora 14","start":"20:01","end":"21:01","startHours":20.016026722821998,"endHours":21.016026722821998,"planetary_lord":"Mercury"},{"name":"Hora 15","start":"21:01","end":"22:01","startHours":21.016026722821998,"endHours":22.016026722821998,"planetary_lord":"Venus"},{"name":"Hora 16","start":"22:01","end":"23:01","startHours":22.016026722821998,"endHours":23.016026722821998,"planetary_lord":"Sun"},{"name":"Hora 17","start":"23:01","end":"00:01","startHours":23.016026722821998,"endHours":24.016026722821998,"planetary_lord":"Mars"},{"name":"Hora 18","start":"00:01","end":"01:01","startHours":24.016026722821998,"endHours":25.016026722821998,"planetary_lord":"Jupiter"},{"name":"Hora 19","start":"01:01","end":"02:01","startHours":25.016026722821998,"endHours":26.016026722821998,"planetary_lord":"Saturn"},{"name":"Hora 20","start":"02:01","end":"03:01","startHours":26.016026722821998,"endHours":27.016026722821998,"planetary_lord":"Moon"},{"name":"Hora 21","start":"03:01","end":"04:01","startHours":27.016026722821998,"endHours":28.016026722821998,"planetary_lord":"Mercury"},{"name":"Hora 22","start":"04:01","end":"05:01","startHours":28.016026722821998,"endHours":29.016026722821998,"planetary_lord":"Venus"},{"name":"Hora 23","start":"05:01","end":"06:01","startHours":29.016026722821998,"endHours":30.016026722821998,"planetary_lord":"Sun"},{"name":"Hora 24","start":"06:01","end":"07:01","startHours":30.016026722821998,"endHours":31.016026722821998,"planetary_lord":"Mars"}],"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":"West (Paścim)","chandraVasa":"South-East","rahuVasa":"South-East","anandadiYoga":{"name":"Mātaṇga","quality":"Auspicious"},"tropicalRitu":"Śiśira (Winter)","vedicRitu":"Śiśira (Winter)","tropicalAyana":"Uttarāyaṇa","vedicAyana":"Uttarāyaṇa","meta":{"method":"BOB-History Sūrya-Siddhānta + Vidhyamitra Tier-2 spherical localization","declination":-13.435416079955456,"eotMinutes":-14.599525260622107,"ayanamsa":23.5892}},"calendars":{"vikram_samvat":2038,"vikram_samvatsara":"Bhāva","saka_samvat":1903,"saka_samvatsara":"Durmati","bengali_samvat":1388,"malayalam_era":1157,"nanakshahi_year":512,"lunar_month":"Māgha","lunar_month_paksha_full":"Māgha Śukla Pakṣa","lunar_month_system":"purnimanta","lunar_month_purnimanta":"Māgha","lunar_month_amanta":"Māgha","lunar_month_is_adhika":false,"lunar_month_purnimanta_is_adhika":false,"lunar_month_amanta_is_adhika":false,"solar_month":"Kumbha (Māsi)","ritu":"Śiśira (Winter)","display_summary":"Māgha Śukla Navamī · Vikram 2038 Bhāva · Śaka 1903 Durmati"},"festivals":[],"todays_walk":{"walk":{"id":"shukra-walk","name":"Śukra Walk","name_sanskrit":"शुक्र यात्रा","type":"graha","description":"Beauty + creativity in dharma + BG 10.36.","step_count":5,"url":"/walk/shukra-walk"},"reason":"Śukravāra (Friday) — 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},{"historical_date":"-1626101-04-03","event":"Bhagavān Rāma's birth at Ayodhyā","chart_id":"rama","shared_marker":"same Śukla Navamī","url":"/day/-1626101-04-03","relevance":0.5}]},"validity":{"eternal":false,"location_specific":"noida"},"liturgical":{"opening":"जय श्री कृष्ण","closing":"ॐ तत् सत्","attribution":"Computed by Vidhyamitra Sūrya-Siddhānta substrate + Vidhyamitra Tier-2 layer"},"seo":{"title":"Pañchāṅga February 13, 1981 CE · Noida, Uttar Pradesh · Vidhyamitra","description":"February 13, 1981 CE for Noida, Uttar Pradesh: Śukla Navamī, sūryodaya 07:01, sūryāsta 18:09.","schema_org_type":"Article","canonical":"https://vidhyamitra.com/city/noida/1981-02-13","hreflang_alternates":{"en":"https://vidhyamitra.com/city/noida/1981-02-13","sa":"https://sa.vidhyamitra.com/city/noida/1981-02-13","hi":"https://hi.vidhyamitra.com/city/noida/1981-02-13","x-default":"https://vidhyamitra.com/city/noida/1981-02-13"}},"provenance":[{"pillar":"BOB-History","pillar_version":"2.12.0","method":"Sūrya-Siddhānta first-principles + Bhāskara II + Kerala-school (Mādhava-Nīlakaṇṭha) corrections","retrieved_at":"2026-05-31T23:03:35.121Z","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":"2026-05-31T23:03:35.121Z","verification":{"type":"community-validated","markers":["modern-reference checked timing on Narasiṁha Jayantī 2026"],"confidence":"verified"}}],"meta":{"generated_at":"2026-05-31T23:03:35.121Z","pillar_versions":{"Sūrya-Siddhānta":"Pūrṇa","Vidhyamitra-Tier2":"Pūrṇa"}}}