How Rahu Kaal Is Calculated

Rahu Kaal is a daylight-based interval, not a permanently fixed clock range. For the selected city and date, the calculator first determines local sunrise and sunset. The daylight span between them is then divided into eight equal parts. The weekday decides which of those eight parts is Rahu Kaal.

This means two inputs matter at the same time: the weekday and the local solar day. A Monday always selects the second daylight interval under this convention, but the clock time of that second interval changes as sunrise, sunset and day length change.

The same daylight span can also be divided for Yamagandam and Gulika Kaal, but those categories use their own weekday interval patterns.

A printed example that assumes exactly twelve hours of daylight makes each eighth last ninety minutes. Real daylight is not always twelve hours. Day length changes with date and latitude, so the interval length can be shorter or longer than ninety minutes. Longitude also affects where local solar events fall on the IST clock.

For that reason, this site recalculates each selected date instead of storing one permanent Rahu Kaal chart for the whole year.

Select the city closest to the location you want to check, enter the intended date, and confirm that the city/date printed beside the result are correct. If an event is in a different supported city, open that city page rather than reusing a nearby city’s time without checking.

Rahu Kaal is a traditional calendar label, not a prediction of what will happen. Necessary or urgent activities should not be delayed because of a timing label.