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Understanding rahu kaal
One eighth of the time between sunrise and sunset, traditionally avoided for starting anything new. Which eighth depends on the weekday — and because it is derived from real daylight, no fixed table can be right.
The calculation
Take sunrise and sunset for your location. Divide the interval into eight equal parts. The part that is rahu kaal is set by the weekday, following a fixed sequence: the eighth part on Sunday, the second on Monday, the seventh on Tuesday, the fifth on Wednesday, the sixth on Thursday, the fourth on Friday and the third on Saturday.
Nothing in that calculation involves the planet Rahu's position. It is a weekday-indexed division of daylight, which surprises people who expect it to be astronomical.
Why fixed tables are wrong
A table of clock times can only be correct for one city on one day. Daylight is about two hours longer in June than December at Delhi's latitude, so an eighth of it changes by roughly eighteen minutes between the solstices. Longitude shifts the whole window again: Kolkata's rahu kaal starts nearly an hour before Rajkot's on the same weekday.
The pages here compute it from actual sunrise and sunset for the city you pick, which is the only way to get it right.
Does it affect markets?
This platform has not been able to measure an effect. Rahu kaal is run through the same event study as every other condition, with the same gates, and it does not clear them on the data tested.
That is a measurement, not a verdict on the tradition. It means the effect, if any, is smaller than this method can distinguish from chance — which is a different claim from "it does nothing", and the platform is careful not to make the stronger one.
About these timings
The figures on this page are astronomical calculations: positions of the Sun and Moon worked out for your city and date. Those are measurements, and they are as exact as the ephemeris behind them.
What the traditions take each one to MEAN — auspicious, inauspicious, favourable for a particular act — is tradition, recorded here as tradition. Nothing on this page is a prediction, and nothing on it is financial advice.