Rahu Kaalराहु काल

Traditionally avoided for starting new ventures, signing contracts, travel, or making important decisions. It occurs once per day, at a different slot depending on the weekday (e.g. it falls in the last slot of the day on Sunday, an earlier slot on other days).

One full 1/8th-of-daytime slot, positioned according to a fixed weekday-based table verified against Drik Panchang.

Rahu is one of the two lunar nodes in Vedic astrology — a mathematical point where the Moon's orbit crosses the ecliptic, not a physical planet. Because solar and lunar eclipses occur near the nodes, Rahu became associated in classical texts with sudden disruption, illusion, and the unpredictable. Rahu Kaal (literally "Rahu's time") is the daily window when Rahu's shadow is considered strongest — a period of heightened uncertainty rather than outright danger. It is one of the most universally observed timing rules across all regional traditions of Hindu astrology, from Kerala's Panchangam to North India's Panchang.

The classical guidance is to avoid initiating anything whose outcome you care about: starting a new business, signing contracts or legal documents, beginning a journey, making large purchases, launching a product, performing wedding or griha pravesh ceremonies, or starting medical treatment. The key word is "initiating" — Rahu Kaal is about new beginnings, not ongoing activity. A meeting that started before Rahu Kaal and runs into it is generally considered fine; a meeting you schedule to start during Rahu Kaal is what's traditionally avoided.

Rahu Kaal is not a period of paralysis. Routine work, ongoing tasks, eating, resting, exercise, and entertainment are all unaffected. Some classical sources specifically recommend Rahu Kaal for worship of Rahu itself (to appease the node), for activities involving hidden or occult knowledge, and for tasks where disruption of the status quo is actually the goal. In modern practice, most people simply avoid scheduling important new starts during this window and carry on with everything else normally.

Rahu Kaal is calculated as 1/8th of the daytime — and daytime is defined as sunrise to sunset, which varies significantly by location and season. In Mumbai in December, daytime might be ~11 hours; in Delhi in June it might be ~14 hours. That means the same weekday's Rahu Kaal slot can differ by over an hour between two cities, and by 30–45 minutes between summer and winter in the same city. Apps or printed tables that show a fixed time (e.g. "Sunday Rahu Kaal: 4:30–6:00 PM") are using an approximation for a fixed location and season — they will be wrong for your city and date. This app calculates Rahu Kaal from your actual local sunrise and sunset.

Rahu Kaal does not mean the entire day is ruined if you accidentally start something during it — classical texts treat it as a timing caution, not a curse. It also does not apply to activities already in progress, only to new initiations. Another common misconception is that Rahu Kaal lasts exactly 90 minutes — it does not; it lasts exactly 1/8th of that day's actual daytime, which is rarely 90 minutes. Finally, Rahu Kaal is a daytime-only concept: it is calculated from sunrise to sunset and has no nighttime equivalent (unlike Choghadiya, which covers both day and night).