Rahu Kaal or Rahu Kaalam or Rahu Kala is an inauspicious and ominous time of the day when no good work should be done. Any kind of new or good work that needs to be done should be completely avoided during the Rahu Kaal. One who doesn't know about the ominous nature of Rahu Kaalam is bound to fail in their venture despite their best efforts.There may have been an investment to be made, some major purchase to be done, a new endeavor to be initiated, a journey to be started, a meeting with an old friend to be arranged -irrespective of whatever is new, whatever is important, whatever holds value in your life, should be completely avoided or stopped during the Rahu Kaal.Even medical treatments, no matter how urgent, should not be opted for during the Rahu Kala. Otherwise, it may turn out to be harmful rather than helpful for the patient. Rahu Kaal is calculated by computing the one-eighth part of the time between Sunrise and Sunset. Not all astrologers can calculate the rahu kaal with accuracy and as a result, you become the victim of disaster in spite of taking the necessary measure.Rahu kaal varies from one place to another, depending on the time of sunrise and sunset. Therefore, wrong calculation of rahu kal can turn out to be hazardous.