Rahu and ketu are not visible planet in the sky like others planet. They are mathematical calculative points. Perhaps We have very importance of Rahu and Ketu. Rahu is the North Node of Moon and Ketu is the south Node Moon. One our historic history Rahu and ketu both are one person . Which cut in to 2 from neck by Lord Vishnu.
The place where termites gather and make mounds in the forest. Where snake live or holes where there is darkness Rahu and ketu rules.
Snake charmers or those engaged in catching snakes, donkey, Ram, sheep, Camel, Snake , mosquitoes, bug for types , insects , owl , places where there is always darkness. These all places ruled by Rahu and ketu.
The presiding deity of Rahu is sheshnag and that of ketu is lord Brahma.
Rahu. – The body of Rahu is big , blue color , by caste is low caste. In the body has skin diseases. It is not religious and indulge in showiness – confidence trickster. It has cough and tell lies , is cunning , suffer from diseases, has low mental power, and always indulges in backbiting.
Ketu. – Ketu eyes are red and piercing. Poison in his speech, high body, always bears arms. The color of Body is like smoke. He is always smoking. Physically is thin and spots marks on wounds on his body. Ketu by nature is cruel and always indulges in causing anguish and hurt to others. His caste is low.
The Metal of Rahu is Lead and clothes are tattered. The Ketu is made of earthen pots and clothes are spotted.
Freinds of Rahu and ketu. – Mercury , Venus and Saturn .
Neutral – Mars
Enemies – Sun , Moon and Jupiter are the enemies of Rahu and Ketu.
Rahu has control on the trees of Saal , Eucalyptus etc.
Gemstone of Rahu. – Hessonite ( Gomed in Hindi )
Gemstone of Ketu. – Cats Eye ( lehsunia in hindi)
Generally Rahu and ketu works according to their depositor lord or planets conjunct with them. example if Rahu is placed in Aries sign then Aries lord is Mars so Rahu can work as Mars and Ketu will be placed in Libra in this example ,Libra lord is Venus so ketu will work as Venus. If any other planet like Jupiter is also placed in Aries sign so some effect of Jupiter Rahu will have.
Rahu and ketu have no ownership in Zodiac 12 signs.