Rahu kaal also called as rahu kaal, rahukalam, rahu kal, rahu kalam is the time in day which is called the time of Rahu . Rahu kaal varies with date and place. That means rahu kaal keeps changing for different days and is also different for different places(difference is due to the change in standard time). Any holy , auspicious or good work should never be started during the rahu kaal. Rahu kaal lasts for nearly two hours. As per Indian mythology and vedic shastras it is recommened to avoid doing good things in this time span.