MB Rahu Kaal - Version 1.0 MB Rahu Kaal calculates the Rahu Kaal. Rahu Kaal is an inauspicious time period in a day when favorable tasks are not performed. This software is based on the principles of Vedic Astrology. It is preferable to do all important and good tasks in the time before or after the Rahu Kaal. Using MB Rahu Kaal Software you can decide when to proceed with your actions and when to hold back to prevent your efforts from turning fruitless. Rahu kaal is an inauspicious influence. The influence of this period has been negative in most of the cases, resulting in failure despite sincere perseverance, troublesome situations, physical ailments and even accidents and loss of money.