Why location matters for accurate Hindu panchang calculations
Short answer: No. Maharishi Vashistha, Surya Siddhanta, Bhaskaracharya, and Tithi Chintamani all state the same principle — wherever you are, use the panchang computed for that place according to Drishya Ganita.
Indians living in USA, UK, Canada, Europe, Gulf countries, Australia and elsewhere often observe festivals and muhurthas using the almanac published for their home town in India. This is incorrect. Here is why.
The world is divided into many time zones and the earth is not flat. The length of day varies from one place to another — the closer you are to the poles, the longer days and nights become. Hindu festivals and tithis are observed based on local parameters: local sunrise, local sunset, local moonrise, and local lagna. These are different for every city.
There are two kinds of panchang elements:
The tithi of a day is decided by whichever tithi prevails at local sunrise. If nakshatra at sunrise differs between India and America, you will see Amrita Yoga in India and Marana Yoga in America on the same day.
India is a relatively small country — sunrise and sunset times vary minimally from Bombay to Kolkata — so one calendar can serve the whole country in most cases. Outside India this does not hold.
Sunrise in Bombay on March 17: 6:36 AM IST. Phalguna Amavasya ends at 5:35 PM IST, so the new month Chaitra begins on March 18 in India.
IST − PDT = 12 h 30 min. Subtracting: 5:35 PM IST → 5:05 AM PDT in Seattle. Sunrise in Seattle on March 17 is 7:17 AM — Amavasya has already ended before sunrise, so Prathama prevails at sunrise. Chaitra begins on March 17 in Seattle, not March 18.
Also see: Why Hindu festival dates differ between India and America
Wedding muhurthas and other auspicious days found in a panchangam are general good days — they do not automatically apply to you. You must also check whether the day is good for your birth star. For house-warming, the position of the sun or moon relative to your door direction also matters.
Do not blindly use good days from any almanac. Contact your local astrologer and ask them to use our Drishya Panchangam which covers 310+ cities worldwide. You can also write to us at muhurtham at mypanchang dot com.
Question: My family astrologer in Chennai prepared a muhurtham for my house-warming in Seattle. Can I use it?
No. Muhurtham calculated for Chennai (using Chennai's longitude and latitude) cannot be used in New Delhi, let alone Seattle.
Muhurtham rests on the five limbs of the panchang: Tithi, Vara, Nakshatra, Yoga, Karana — plus the solar and lunar month names. Most major rites follow the solar calendar; graha pravesha and similar muhurthas use the lunisolar month. All of these depend on local sunrise.
Vrishabha lagna on April 7 in Bangalore starts around 8:30 AM IST (Anuradha nakshatra). Subtracting 12 h 30 min for PDT gives 8:00 PM PDT on April 6 in Seattle — which is Libra (Tula) lagna, not a sthira lagna.
The actual Vrishabha lagna in Seattle on April 7 starts at 8:08 AM PDT, but at that time the nakshatra in Seattle is Jyestha, not Anuradha — Anuradha ended at 6:58 AM. The entire ball game changes. A different lagna (perhaps Kumbha) must be found for Seattle.
Rahu Kalam, Yamagandam and Gulika Kala are not fixed timings. Most published panchangams show them assuming sunrise at 6:00 AM and sunset at 6:00 PM — which is wrong for almost every day of the year. They are calculated from actual local sunrise to sunset. Similarly, Chogadia and Hora are counted from local sunrise. See our guide on reading the panchang.
Bottom line: Never transfer a muhurtham from one city to another. Always use the panchangam of the city where the event will be held. Use www.mypanchang.com to find the panchangam for your city.
Drishya Ganita means calculations corresponding to observable reality. Our panchangam uses high-precision algorithms based on NASA's JPL DE405 ephemeris — the same standard as modern astronomical software. Panchangams based on Surya Siddhanta or Grahalaghava can differ by up to two hours because those formulas require periodic observational corrections (bija samskara) that have not been applied in centuries.
You will notice that even traditional Vedic panchangam publishers silently copy eclipse timings from Drishya panchang — because their own calculations would be off by several hours and the eclipse would not be observable using those times. Pundit Dhundiraj Shaastree Date is a pioneer of Drishya Ganita panchangam; Lokamanya Tilak also advocated for it.
Question: But we are Indian — shouldn't we follow the Indian calendar?
The calendar is not the issue — your location is. The same Drishya principles that apply in India must be applied for the location where you live. Use a panchangam computed for your city.
The widgets below show today's live panchang from mypanchang.com for five cities. Notice how tithi endings, nakshatra timings, sunrise/sunset, rahu kalam, and other parameters differ between cities on the exact same calendar day. This is exactly what we have been explaining above.
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