Rahu Kaal: What It Is, When It Occurs, and Why It Matters
Rahu Kaal is the inauspicious 90-minute window ruled by Rahu that falls every day of the week. Here's how it's calculated, what to avoid, and when exceptions apply.
Of all the inauspicious time periods in the panchang, Rahu Kaal is the most widely observed. Walk into any Hindu home in Chennai, Chicago, or Calgary, and you'll find someone checking when Rahu Kaal falls before booking a flight, signing a lease, or launching a business.
What is Rahu Kaal?
Rahu Kaal (also spelled Rahu Kalam or Rahu Kaalam) is a 1.5-hour period each day associated with Rahu, the shadow planet that causes eclipses in Vedic astrology. Rahu is considered malefic — associated with sudden reversals, deception, and obstacles. Starting an important new endeavor during Rahu Kaal is traditionally believed to invite these qualities into the undertaking.
How Rahu Kaal Is Calculated
The day is divided into 8 parts from sunrise to sunset. One of those parts is Rahu Kaal. Which part depends on the day of the week, following the mnemonic "Mother Saw Father Wearing The Turban Sunday":
- Monday: 2nd part (roughly 7:30–9:00 AM)
- Tuesday: 7th part (roughly 3:00–4:30 PM)
- Wednesday: 5th part (roughly 12:00–1:30 PM)
- Thursday: 6th part (roughly 1:30–3:00 PM)
- Friday: 4th part (roughly 10:30–12:00 PM)
- Saturday: 3rd part (roughly 9:00–10:30 AM)
- Sunday: 8th part (roughly 4:30–6:00 PM)
These times are only approximate — the actual window shifts every day because sunrise time changes. A location-aware panchang app gives you the precise window for your city.
What to Avoid During Rahu Kaal
Traditional guidance advises against beginning new activities during Rahu Kaal: signing contracts, starting travel, making investments, conducting puja, launching products, or undertaking medical procedures. The key word is beginning — Rahu Kaal doesn't affect activities already underway when it starts.
Exceptions and Context
Some temples observe Rahu Kaal differently for worship — in certain South Indian traditions, Rahu Kaal on Fridays and Tuesdays is actually considered auspicious for Rahu worship. Additionally, the duration of Rahu Kaal's influence is debated among pandits: some observe strict 90-minute avoidance, others add a buffer on either side.
Rahu Kaal also interacts with other panchang factors. An otherwise inauspicious Rahu Kaal window overlaid on a Sarvaartha Siddhi Yoga day may still be avoided for new starts, while the rest of the day carries enhanced auspiciousness.
Gulika Kaal and Yamaganda Kaal
Rahu Kaal is one of three inauspicious daily windows. Gulika Kaal (ruled by Saturn's son Mandi) and Yamaganda Kaal (ruled by Yama) follow similar calculation logic. All three are shown in a complete daily panchang.
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