Quick answer: Rahu Kalam is an inauspicious window of roughly 90 minutes that occurs once every day. It is found by dividing the time between sunrise and sunset into eight equal parts; the part that counts as Rahu Kalam depends on the day of the week. Because sunrise and sunset change with your location and the season, there is no single fixed clock time. The weekday table below gives the standard slots for an idealised 6:00 AM to 6:00 PM day, but you should adjust them to your own local sunrise.
Key Information at a Glance
| What it is | A daily inauspicious period ruled by the shadow planet Rahu |
| Duration | One-eighth of the daytime — about 90 minutes on a 12-hour day |
| How often | Once every day, including Sundays |
| How it is fixed | By weekday — the eighth division it falls in changes from day to day |
| Depends on | Local sunrise and sunset, so it varies by city and by season |
| Also called | Rahu Kaal, Rahukalam, Rahu Kala |
What Is Rahu Kalam?
Rahu Kalam (also spelt Rahu Kaal) is a short period of each day that traditional Hindu astrology treats as unfavourable for starting anything important. It is associated with Rahu, one of the two shadow points (along with Ketu) where the Moon’s orbit crosses the apparent path of the Sun. Rahu is not a physical planet but is treated as a graha in Vedic astrology, and the daily window named after it is considered a time when new beginnings are less likely to go smoothly.
The belief is widely followed across India, particularly in the south, where many people check the day’s Rahu Kalam before fixing the timing of weddings, travel, property purchases, business launches, or other ceremonies. It is worth being clear about what this is: a long-standing cultural and astrological convention, not a scientifically established phenomenon. People observe it as part of tradition and personal faith rather than as a proven rule.
Day-wise Rahu Kalam Reference Table
Rahu Kalam falls in a fixed sequence of eighth-divisions that depends only on the weekday. The slots below assume an idealised day from 6:00 AM to 6:00 PM, which gives eight equal parts of 90 minutes each. These are approximate reference times — your real Rahu Kalam shifts earlier or later depending on your local sunrise.
| Weekday | Eighth-division it falls in | Approx. slot (6 AM–6 PM day) |
|---|---|---|
| Monday | 2nd | 7:30 AM – 9:00 AM |
| Tuesday | 7th | 3:00 PM – 4:30 PM |
| Wednesday | 5th | 12:00 PM – 1:30 PM |
| Thursday | 6th | 1:30 PM – 3:00 PM |
| Friday | 4th | 10:30 AM – 12:00 PM |
| Saturday | 3rd | 9:00 AM – 10:30 AM |
| Sunday | 8th | 4:30 PM – 6:00 PM |
A common mnemonic for the weekday order of divisions is “Mother Saw Father Wearing The Turban (on) Sunday” — Monday, Saturday, Friday, Wednesday, Thursday, Tuesday, Sunday — which maps to divisions one through seven in the southern counting style. The table above uses the widely published timings for a standard day.
How to Calculate It Accurately for Your Location
To work out Rahu Kalam precisely for any day and place, follow these steps:
- Find the exact sunrise and sunset times for your city on the date you want.
- Calculate the total daytime length — the gap between sunrise and sunset.
- Divide that total by eight. The result is the length of one division (about 90 minutes when the day is 12 hours, but shorter in winter and longer in summer).
- Number the eight divisions in order starting from sunrise.
- Pick the division that belongs to the weekday using the table above, and count forward from sunrise to find its start and end times.
For example, if sunrise is at 6:00 AM and sunset at 6:00 PM on a Tuesday, each division is 90 minutes and Rahu Kalam (the 7th division) runs from 3:00 PM to 4:30 PM. If the same Tuesday had sunrise at 5:30 AM and sunset at 7:00 PM, each division would be about 101 minutes, and the 7th division would shift accordingly. This is why two cities, or the same city in different months, will show different Rahu Kalam times.
What People Avoid and Common Beliefs
During Rahu Kalam, observant people typically avoid beginning anything they consider auspicious or important. Commonly mentioned examples include:
- Starting a journey or a long trip
- Conducting weddings, engagements, or housewarming ceremonies
- Signing major agreements, buying property, or launching a business
- Beginning important religious rituals or new ventures
Many practitioners note that tasks already in progress are usually allowed to continue, and that routine daily activities are not affected. Some traditions also hold that prayer, chanting, and devotional practice are acceptable or even encouraged during this time. Practices and exceptions vary between families and regions, so it is best treated as a guideline rather than a strict prohibition.
Frequently Asked Questions
How long does Rahu Kalam last each day?
Rahu Kalam lasts for one-eighth of the daytime. On a typical 12-hour day from sunrise to sunset, that is about 90 minutes. The exact length changes with the season because the gap between sunrise and sunset gets longer in summer and shorter in winter.
Is Rahu Kalam the same time everywhere in India?
No. Rahu Kalam depends on local sunrise and sunset, which differ from city to city and from season to season. Two places can have noticeably different Rahu Kalam timings on the same date, so you should always calculate it for your own location.
Does Rahu Kalam occur on Sundays too?
Yes. Rahu Kalam happens every day of the week, including Sundays. On a standard 6:00 AM to 6:00 PM day it falls in the eighth and final division, roughly between 4:30 PM and 6:00 PM.
How do I calculate Rahu Kalam for a specific day?
Find your local sunrise and sunset for that date, divide the daytime into eight equal parts, and select the part assigned to that weekday. Counting forward from sunrise gives you the start and end of Rahu Kalam for your exact location and date.
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