According to the Rigveda, when Rahu – the son of Asuya or Sinhika covers the sun and the moon with his darkness, then it becomes so dark that the people became unable even to identify their places. The presiding deity of Rahu is ‘Kaal’. It is symbolised by a black flag in north-west direction among all the nine planets. The great phase of Dragon’s head lasts for 18 years.
Barring few situations it is generally considered to be an inauspicious planet. According to astrology, if ‘Rahu’ is situated unfavorably in the horoscope then it causes many types of physical illnesses. It also creates obstacles in the way of accomplishing tasks.
Rahu can be appeased through devoted worship and chanting of Rahu mantra to prevent hidden enemies, wrong diagnosis of illness, and deceit from those around us and negative energies from affecting well-being.