Rahu Ketu always travel in the opposite direction to the normal planets, in anti Clock Wise position.
Rahu denotes the forefathers of the paternal Side and Ketu denotes the fore fathers of the maternal side.
When all the planets are in between Rahu and Ketu the yoga formed is called the Kala Sarpa Yoga.
Infact, Which ever houses Rahu Ketu are placed, significations of that house suffer in the life of the native.
Rahu or Ketu in the 3rd,6th and 11th houses give extremely good results. But will give bad results in all other houses.
Parasara Hora Sastra says Rahu is in own sign in Kumbha rasi and Exalted in Vrushabha Rasi. Like wise Ketu is in Own sign in Vruschika rasi and gives good results in he signs of Jupiter.
Rahu always drags one into the materialistic dimension of anything and on the other hand Ketu is the moksha karaka and gives detachment with the significations of sign/bhava it is placed in.
Vrischika Rasi is the sign of debilitation of Rahu. Now let us see what will be effects of Rahu placed in the sign of Vrischika :
Vrischika is a sign of Mars, which is usually inimical towards Rahu. Vrischika is a sign associated with secrecy and mystery and Rahu is also the master of confidential information and secret knowledge. When Rahu is placed in Vrischika, the native has a strong tendency to be mysterious in nature. Such a person is quite secretive about their doings. You never know what they are up to. What’s evident is not always the truth in their case. Rahu in Vrischika also affords the native with hidden powers and mysterious knowledge. It also gives a strong intuition to the native.
Rahu in Vrischika also causes health issues to the native. Rahu in this position also creates chances of accident. Such people tend to feel burdened in life. Their longevity also suffers due to Rahu in Vrischika since it is also associated with 8th house. Such people however are strong and defeat enemies. They do well in research. They also earn a lot of wealth in life, but often using the wrong means. They tend to look for shortcuts in life. There is also a tendency to indulge in anti-social and criminal activities. Fields like medical and surgery often appeal to these natives.
What if Rahu is in 8th house which is Vrischika ???
Vrischika will be the 8th house for Mesha Ascendant natives. The following effects will be seen in the major period of Rahu . This placement of Rahu in 8th house will be a source of major unhappiness. Bhaskaracharya in his astrological treatise Bhaskara Deepa Chandrika states that the native may die of Snake bite or poison. If Rahu is placed in the Visakha nakshatra part of Vrischika rasi , this may cause the native to be held captive in a foreign country and be sentenced to death. Rahu in the Anuradha part of Vrischika will cause the native to suffer on account of his unethical deeds in his profession. Rahu in Jyeshta part of Vrischika will cause the native to face deception and will also cause difficult diseases. The native may face deception through his maternal uncle. The spouse of the individual will be aggressive and short tempered.