Muhurat and timings

Abhijit muhurta, Choghadiya and Gowri Panchangam: the good windows

Three systems for finding the favourable hours of a day — the daily abhijit window, the north Indian choghadiya, and the Tamil gowri panchangam — how each is computed, and how they relate.

Rahu kalam tells you when not to begin. Three other systems tell you when to — and unlike rahu kalam they are not one number a day but a full division of the daylight and night hours. They come from different regions and different periods, they use different names, and they are all built the same way: divide the time between sunrise and sunset, assign each part a planetary ruler, and read the ruler's character off the result.

Abhijit muhurta — the simplest and the strongest

The daylight period is divided into fifteen muhurtas. The eighth — the one straddling solar noon — is abhijit. On a twelve-hour day each muhurta is forty-eight minutes, so abhijit runs roughly twenty-four minutes either side of the moment the sun is highest.

It is regarded as favourable for nearly anything, and classical texts treat it as a fallback: when no better muhurta can be found, abhijit will serve. The name means 'victorious' or 'unconquered', and it is also the name of a twenty-eighth nakshatra that appears in older lists — the star Vega — which the twenty-seven-fold scheme later dropped.

• It moves with solar noon, so it moves with your longitude — not with the clock.
• It is longer in summer and shorter in winter, since a muhurta is a fifteenth of daylight.
• It is traditionally not taken on Wednesday.
• It is not used for journeys towards the south in some traditions.

Choghadiya — the north and west

Choghadiya divides the daylight period into eight parts rather than fifteen, and the night into eight more. The word comes from chau ghadi — four ghadis, a ghadi being twenty-four minutes, so each choghadiya is about ninety-six minutes on an equinoctial day.

Each part is ruled by a planet, and the sequence starts from the weekday's own lord and runs in the order of the descending planetary speeds. The result is seven named periods with fixed characters.

Amrit, Shubh, Labh and Char are the four commonly treated as usable; Udveg, Kaal and Rog are the ones worked around. Note that the day sequence and the night sequence differ — the night choghadiya for a given weekday is not a repeat of its day sequence, which is a common error in printed tables.

Gowri Panchangam — the Tamil system

The Tamil country uses a parallel scheme with the same structure and different names: eight divisions of daylight, eight of night, each with a character. Its favourable periods are collectively called nalla neram — literally 'good time' — which is the phrase most people search for.

The two systems are not translations of one another and their boundaries do not always coincide, but they answer the same question and a household normally follows whichever its region uses rather than consulting both.

Hora — the planetary hour

A third division, and the one with the widest reach outside India: the twenty-four hours from sunrise are each assigned a planetary ruler, cycling in Chaldean order — Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon. The first hora of the day belongs to the weekday's lord, which is precisely why the days of the week are named as they are, in Sanskrit and in English alike.

Hora is used for finer selection than choghadiya allows: a Mercury hora for correspondence or trade, a Jupiter hora for teaching or a formal request, a Venus hora for anything to do with art or partnership. Note that a hora is a twelfth of the daylight period rather than a clock hour, so it is longer than sixty minutes in summer and shorter in winter.

How the three fit together

They are three resolutions of the same day, and they are used in decreasing order of importance rather than being reconciled with one another.

1. First, avoid rahu kalam, yamagandam and gulika kalam. This is the near-universal check.
2. Then, if the day matters, place the act in abhijit muhurta.
3. If abhijit does not suit — the act must happen in the evening, say — use choghadiya or gowri panchangam to find a favourable window.
4. For fine selection within that window, use hora.

Where they conflict, tradition does not adjudicate; households simply follow the system they have always followed. And all four depend entirely on sunrise and sunset at your own location, which is the one thing they genuinely agree on.

Every timing referenced in these guides is computed astronomically for the city you select and cross-referenced against the traditional panchangams in common use. How we compute