ABOUT KETU(Southern Lunar Node)
Same as Rahu, Ketu is also a shadowy, malefic planet always positioned opposite Rahu. Ketu signifies liberation or Moksha, mysterious knowledge, mystic science and spiritual pursuits. Both Rahu and Ketu can give the person unexpected and sudden results. Ketu can make you magician, astrologer, or medical practitioner.
Ketu is friend with Venus, Rahu, Ketu, and Saturn, and enemy with Mars, Sun, and Moon. Ketu spends one and half year in each zodiac and takes 18 years to complete the zodiac cycle.