Every time in ShubhVela is computed on your phone for your exact location. Nothing is copied from another panchang.
Positions come from Astronomy Engine (MIT licence), accurate to seconds of arc. Sidereal positions use the Lahiri (Chitrapaksha) ayanamsa, including nutation.
Sunrise is when the top edge of the Sun appears on the horizon, including atmospheric refraction (−0°50′). A Hindu day runs from one sunrise to the next. You can switch to the centre of the Sun in Settings.
A tithi is each 12° the Moon gains on the Sun; nakshatras and yogas are 13°20′ divisions; karanas are half-tithis. End times are found by root-finding to under a second. When a tithi starts and ends between two sunrises (kshaya), we show it too.
Lunar months run new moon to new moon (Amanta) and are named after the sidereal sign the Sun is in when the month begins; a month without a sankranti is Adhika. Purnimanta naming shifts the dark half to the next month. Vikram, Shaka, Gujarati and Kali years and the 60-year samvatsara follow.
Festivals are rules, not a fixed list: which tithi must prevail at which part of the day (sunrise, forenoon, midday, afternoon, pradosh, midnight or moonrise). Bhadra is avoided for Holika Dahan and Raksha Bandhan by the classical rule. Ekadashi follows Smarta or Vaishnava practice and shows the parana window.
Our engine is tested against published dates (all 18 major festivals of 2026 match) and against astronomical facts such as new-moon instants and eclipse visibility.
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