Rahu Kaal is a daily inauspicious window lasting roughly 90 minutes, calculated from weekday + local sunrise. Tradition says do not start new auspicious work in this slot — signing property papers, starting a journey for a ceremony, or beginning a business ritual.
What you can still do: Research, browsing listings, commuting home, routine work, and preparation are generally fine. The taboo is primarily about *initiating* sacred or high-stakes beginnings.
How the clock is built: Daytime (sunrise to sunset) is split into eight equal parts. Each weekday assigns Rahu to a different eighth. Sunday’s slot is not Saturday’s. Because sunrise moves through the year, the same weekday in June and December will show different clock times. Night-time is not Rahu Kaal in this system; the window is a daytime construct.
City matters: Because sunrise shifts by latitude/longitude, Mumbai Rahu Kaal is not identical to Delhi. Always check a city-aware page when timing a signing. A 15-minute error is enough to put a registry appointment on the wrong side of the line.
Rahu Kaal vs Yamaganda vs Gulika: Some almanacs also list Yamaganda and Gulika as caution windows. ShubhHaiKya’s daily score uses Rahu Kaal as the publicly recognised “do not start” slot and shows Abhijit as the counterweight. If your family priest also avoids Yamaganda, treat that as an extra local rule on top of our score.
Pair with Abhijit: If the day score is Good but you only have a midday slot, Abhijit Muhurat is the usual “safe harbour.” If the day is Avoid, skip forcing the deal into Rahu Kaal and jump to the next better date on ShubhHaiKya.
Travel exception: Leaving home for a routine commute is not the same as starting a pilgrimage or a wedding baraat. Use Rahu Kaal strictly for ceremonial departures and document signings; do not freeze ordinary office travel.