Questions
Why does my family or temple calendar differ by a day?
Tithi dates each festival by the tithi that holds at the time it is kept, as Drik Panchang does. It doesn’t model eclipses, bhadra, nakshatra conditions or regional customs, and some traditions follow other rules. When a date matters, go by your family or temple.
Why is a festival on a different day abroad?
A tithi begins at the same moment everywhere, but a festival is kept on the day the tithi holds at a local time: sunrise, dusk or moonrise. In New York or London that time can fall on a different calendar day than in India. Pick your city to see its own dates, or compare cities on the festival pages.
Amanta or purnimanta: which months do I use?
Amanta months end at the new moon and are used in the south and west. Purnimanta months end at the full moon and are used in the north. Festivals fall on the same days either way; only the month name in the dark fortnight changes. Switch with “Months” at the foot of the page.
What is Rahu kalam?
An eighth of the daytime ruled by Rahu, at a different point each weekday. Tradition says not to start anything new in it, a journey included; work already under way can carry on.
Is it accurate outside India?
Everything is worked out for your city’s coordinates and time zone. Festival dates are checked against Drik Panchang for New Delhi (2025–2027) and London (2026).
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Sun and moon
Positions come from astronomy-engine, a precise open-source ephemeris. Sidereal longitudes use the Lahiri ayanamsa, approximated linearly, which is good to well under a minute of time for panchang purposes.
The day runs from sunrise to the next sunrise. Sunrise is when the sun’s upper edge clears a sea-level horizon, with standard refraction. Hills, buildings and altitude can shift it by a few minutes.
The five limbs
Tithi is each 12° the moon gains on the sun; karana is half of that. Nakshatra is the moon’s sidereal longitude in 27 parts; yoga is the sun’s and moon’s added together, also in 27. Each is named as it stands at sunrise, with the time it ends.
Months are amanta, new moon to new moon, named after the rashi the sun enters during the month. A month in which the sun changes no rashi is adhika. Purnimanta months are the same, shifted by a fortnight.
Hours
Rahu kalam, Yamaganda and Gulika are eighths of the daytime; choghadiya are eighths of the day and of the night; hora are twelfths of each; a muhurta is a fifteenth.
Festivals
A festival falls on the day its tithi holds at the time the observance is kept: sunrise for most, including Janmashtami; midday for Ganesh Chaturthi and Rama Navami; afternoon for Dussehra and Bhai Dooj; dusk for Holika Dahan, Diwali, Dhanteras, Sharad Purnima and Pradosh; midnight for Shivaratri; moonrise for Karwa Chauth and Sankashti. If it holds at that time on two days, the first is taken; if on neither, the day whose sunrise it covers. A sankranti after sunset is kept the next day.
These dates match Drik Panchang for New Delhi across 2025–2027 and for London in 2026, with one exception: in 2026 Drik moves Holika Dahan and Holi a day later for Delhi, most likely because of that evening’s lunar eclipse. Eclipses, bhadra timings, regional customs and nakshatra conditions are not modelled, so a family or temple calendar can differ by a day. When it matters, check with them.