In Indian Vedic Astrology Rahu-Ketu as ‘Graha’ (planets) play big role. These planets has no physical existence but cosmic vibration of these planets can be seen in our day to day.
Astronomically, Rahu and Ketu indicate the points of intersection of the paths of the Sun and the Moon as they move on the celestial sphere. That is why Rahu and Ketu are respectively called the north and the south lunar nodes.
These are imaginary point from which we receive sensitive rays (like UV rays and IR rays) due to gravitation of the earth. These rays will have certain impact on the people living in earth.
Rahu is also a karaka graha (planet) for strategies and politics. Rahu governs the south-west direction in your house.The South-west is the strongest direction in the plot as it stores magnetic energies flowing in from the North-east.
Rahu is male and a favourable graha (planet) for Politicians.
It gives them great opportunities and powers to rise in politics.
Rahu is karaka for knowledge, speech, foreign travel, telecommunications, computers, work related to electronics, shipping, piloting, journeys abroad, poisonous medicine, genetic and hereditary diseases disease, risks, research and new inventions.
Rahu and Ketu move retrograde. Rahu Element is Air and Ketu Element is Earth.
Rahu and Ketu are always associated our family Genes.
One of the most scientific and logical imagination of Hindu Dharma is the concept of ‘karma’ theory. Karma theory is not a fanciful imagination. Many researches have proved its validity.
Basically it is said that our family karma are passed on to us in DNAs we obtain from our maternal and paternal families.
Rahu shows the Father side whereas Ketu shows Mother side DNAs. Also Rahu is associated with Paternal Grand Parents and Ketu with Maternal Grand Parents.
Even science now says that kids get the properties from Parents and past generations.
Many genetic & hereditary diseases has direct connection with Rahu.
Rahu and Ketu contains the secrets of past lives, family history and related Karmas in form of DNA
If we draw the full path of Rahu and Ketu we get something which looks very similar to DNA threads intermingled.
Also we know that Sun and Moon create the Rahu and Ketu, much like how DNAs are passed from parents to child.