Saturn is a cold and dry planet. The sight of Saturn is considered bad and when ill-placed, causes distress, failure, dejection, difficulties, nervousness, sorrow. It destroys the house it occupies but when well placed it gives fame, success, honor, justice, love, wisdom, leadership ability, authority and long life.This masculine energy rules Capricorn and Aquarius.

Saturn being the eternal employee, makes its subjects work in secondary positions, doing dull routine and ordinary jobs. These people generally reach the position of their section heads towards the fag end of their careers. Also historians, archaeologista, covators of museums, workers in refrigeration factories etc. are ruled by Saturn. Saturn doesn't make things easy, it rather commands to get to work and to work hard. Discipline and responsibility are important to this planet.

Health
Saturn is cold and dry planet. Saturn rules over the hard parts of human body - bones, teeth, knees and ears. Since it is a slow moving, cold planet, it also indicates recurring problems, that do not cause total damage in one stroke, i.e. cold, cough, bronchitis, rheumatism, TB, pyorrhea etc.

Rahu is not the actual planet but is an imaginary planet. Rahu is a node that is positioned where the earth's trajectory around the Sun and the Moon's trajectory around the Earth meet. According to Indian mythology, Rahu represents the head of a demon. Rahu is responsible for Solar eclipse. When Rahu, Sun and Moon are in the same zodiacal longitude Solar eclipse takes place.

Rahu is a 'shudra graha', hence people influenced by Rahu behave like illiterate and uncultured people. It rules over thieves, witches, magicians, venom and poison, snakes and thorny bushes, jails and isolated places, unhabitated places, cemeteries, hypnotists etc.

According to the Puranas, Rahu is instrumental in strengthening one's power and converting even an enemy into a friend. Rahu is often called the Planet of Success. Rahu doesn't rule any zodiac, since it is not a real planet

Just like Rahu, Ketu is also an imaginary planet, a node. The two nodes, Rahu and Ketu are positioned where the earth's trajectory around the Sun and the Moon's trajectory around the Earth meet. According to Indian mythology, Ketu represents the tail of demon(just like Rahu represents the head). The two planets are the parts of the same danava(demon) but are 180 degree apart from each other.

When Ketu, Sun and Moon lie in the same zodiacal longitude lunar eclipse takes place

Ketu in certain way resembles Mars. But many times, it activates only the negative side of Mars. This is why people ruled by Ketu are secret adversaries. It also influences people in pharmaceutical industries, doctors, and astrologers.

The two imaginary nodes, Rahu and Ketu are the mysterious forces and show in the birth chart both karmic and spiritual influences. Like Rahu, Ketu is also not a real luminary and therefore doesn't rule any zodiac sign.