What is Gowri Panchangam?
Gowri Panchangam (கௌரி பஞ்சாங்கம்) is the timing table printed in every Tamil almanac and kept, in Tamil Nadu and across the Tamil diaspora, the way a Choghadiya table is kept further north. The construction is simple: take the interval from local sunrise to local sunset, divide it into eight equal parts, and give each part one of eight names. Do the same for the night, sunset to the next sunrise. Five of the eight names are read as favourable and three are set aside. Because the parts are fractions of the daylight rather than fixed clock hours, each one runs about ninety minutes on a typical day in southern India and stretches or shortens with the season. Nothing in it is a forecast; it is a table of when the tradition prefers a thing to be started.
The five names read as favourable
Amirdha (அமிர்தம்) is nectar, the best regarded of the eight; Laabam (லாபம்) is gain, taken for trade, purchase and agreement; Dhanam (தனம்) is wealth, taken for money and property; Sugam (சுகம்) is ease, taken for travel and pleasant errands; and Uthi (உத்தி) is work, taken for labour begun and effort spent. Practice treats Amirdha as the strongest and reads the other four by what the errand actually is.
The three the almanac sets aside
Rogam (ரோகம்) is illness, Soram (சோரம்) is loss, and Visham (விஷம்) is poison, the harshest of the three. What the tradition asks of these is narrow and worth stating plainly: do not begin something new inside them. Work already under way is not paused, travel already booked is not cancelled, and no classical writer attaches a penalty to a reader who has no choice but to use the hour in front of them.
Why it is a weekday scheme, not a Moon-based one
Every input is on this page's form: the date, the place, and the day of the week that follows from them. No graha position enters the calculation at all, which is why a Gowri table can be printed a year ahead in a paper almanac. That also marks its limit. A tithi, a nakshatra and a yoga move with the Moon and the Sun and must be computed; Gowri and Choghadiya do not, and neither replaces the other.
How is Nalla Neram calculated, and why do almanacs disagree?
Nalla Neram (நல்ல நேரம்) means simply "good time", and it is the line a reader looks for first. The rule we compute is the one most widely published: take the auspicious Gowri parts of the daylight, remove any that fall inside Rahu Kalam, Yamagandam or Kuligai, and of what survives print the earliest morning window and the last evening one. Because both schemes cut the very same daylight into the very same eight parts, the screening is exact rather than approximate: a Gowri part is either one of the three avoided parts or entirely clear of it. That is also where the disagreement between two printed almanacs comes from, and the differences are systematic rather than random.
Some sheets print the Gowri window unscreened
The oldest and plainest practice is to read the auspicious names straight off the table and print the first and last of them, with no subtraction at all. A sheet that does this will sometimes show a good time that our table has removed, and the reason will always be the same one: that part collided with Rahu Kalam, Yamagandam or Kuligai. Neither sheet is doing arithmetic wrong; they are answering slightly different questions.
Others subtract the three avoided windows first
This is the rule we follow, and the one most commonly seen in modern printed and online Tamil panchangams. It is the stricter reading: a window is only offered as good if nothing else on the same sheet argues against it. On weekdays where the avoided part lands on a favourable name it can remove a window a reader was expecting, which is exactly why the third table on this page shows those three windows beside the Gowri parts.
A third practice reads the Moon instead
Some Tamil sheets give a good time derived from the Moon's position on the day rather than from the eight-part weekday table, and print it under the same heading. That figure has a different basis entirely and will not match a Gowri-derived one except by coincidence. If a sheet you keep disagrees with this page by more than a few minutes, checking which of these three rules it uses usually settles it in one step.
Why is the day table different from the night table?
They are built the same way and entered at a different point. The eight names always run in one fixed cycle (Uthi, Amirdha, Rogam, Laabam, Dhanam, Sugam, Soram, Visham, then back to Uthi), and the weekday decides only which name the first part takes. On Tuesday the daylight opens with Rogam and the night opens with Uthi; on Sunday the daylight opens with Uthi and the night with Soram. In each case the night begins six places further along the cycle than the day did. The night parts are also a different length from the day parts on every date except the equinoxes, since one is an eighth of the daylight and the other an eighth of the dark, and in a Tamil month those two are rarely equal.
How does Gowri Panchangam relate to Rahu Kalam, Yamagandam and Kuligai?
All four schemes cut the same daylight into the same eight parts, which is what makes them comparable at a glance. Rahu Kalam (ராகு காலம்), Yamagandam (எமகண்டம்) and Kuligai (குளிகை) each claim exactly one of the eight, by weekday: Rahu takes the 8th part on Sunday, the 2nd on Monday, the 7th on Tuesday, the 5th on Wednesday, the 6th on Thursday, the 4th on Friday and the 3rd on Saturday, with Yamagandam and Kuligai taking two other parts on the same grid. Since the boundaries coincide exactly, a Gowri part never half-overlaps one of them, and the Nalla Neram table above is produced by dropping whole parts rather than by trimming edges.
Three of the eight parts are spoken for every day
On any weekday, three of the day's eight parts belong to one of the avoided windows and five do not. How many favourable Gowri names survive depends entirely on where those three land relative to the weekday's own starting name, and that is why the number of clear windows on this page changes from one day to the next rather than staying fixed at five.
Kuligai is the Gulika window under its Tamil name
Northern panchangams print Gulika Kalam and Tamil sheets print Kuligai; they are the same eighth of the same day, computed identically. Seeing the two names side by side is a common source of confusion for readers who keep one sheet in Tamil and another in Hindi, so the avoided-windows table on this page gives both scripts for each of the three.
How do I use Nalla Neram for a real appointment?
Read it as a preference for a beginning, not as a fence around an activity. If you are signing a document, opening a shop for the first time, starting a journey, making a first payment or fixing the moment a ceremony begins, the tradition asks you to place that first moment inside a favourable window; what follows afterwards is not governed by the table. The practical shape of that is simple. Pick the Nalla Neram window nearest the time you actually wanted, start a few minutes inside it rather than exactly on its boundary, and if neither window suits, take any other favourable Gowri part from the day table that the avoided windows have left standing.
Why is Gowri Panchangam a different time in Chennai and Coimbatore?
Because every boundary on this page is measured from local sunrise, and sunrise is a local event. Two cities in the same state keep one clock but do not see the Sun at the same instant: longitude moves sunrise by about four minutes for every degree, and latitude changes how long the daylight lasts and therefore how long each of the eight parts runs. Both effects compound through the day, so a part late in the afternoon can differ by considerably more than the sunrise difference itself. A single "today's Gowri Panchangam" figure published for a whole state is right for one meridian and approximate everywhere else, which is why this page asks for your city before it computes anything.
What can Gowri Panchangam not tell me?
It cannot tell you what will happen. The eight names are a scheduling convention the Tamil tradition keeps for choosing when to begin, and the texts that carry them make no claim about outcomes. They do not promise that work begun in Amirdha succeeds, and they do not threaten work begun in Visham. Nor is it a reading of you: nothing here touches your birth chart, your Moon rashi or your nakshatra, so the table is identical for everyone standing in the same city on the same day. It is also not the whole of an elective calculation. A proper muhurat weighs the tithi, the nakshatra, the yoga and the lagna as well, and a Gowri window is one input into that rather than a substitute for it.
How this is calculated
Nirayana rashis with the Lahiri (Chitrapaksha) ayanamsha and whole-sign bhavas, computed to arc-second accuracy. Sunrise and sunset are the ones almanacs show, the Sun's upper edge with refraction, so the daily windows agree with the calendars you compare them with. More on our method.