Ketu

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.

Rahu

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.

Saturn

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.

Venus

Venus is also known as 'Shukra' and governs romance, beauty, passion, wealth, dance, music, rain and bed room. A strong Venus brings comfort, wealth, and attraction to opposite sex. The planet Venus is all about pleasure - love, romance and harmony in our emotional attachments, marriages, friendships and other unions. Venus is content to spread happiness and tenderness, all the while teaching us how to love and appreciate others and the things that we possess. While Mars represents the youthful male in our solar system, Venus is the charming princess. Hence Venus is to be considered for happy married life. A well placed Venus in a man's horoscope indicates good relationship with his wife.A strong Venus rules over art and artistic sense and indicates inclination towards music, arts, humorous literature, theater etc. Hence people pursuing arts either professionally or as an amateur, have a strong Venus in their charts. It also rules over cinema and theater stars, films and photography, five star hotels and restaurants and all kinds of sweets. The arts (music, dance, drama and literature, to name a few) and a sense of the aesthetic fall within the ream of Venus. Venus beseeches us to indulge our senses and revel in the beauty of our world. This Planet is inextricably linked to refinement, culture, charm and grace. Venus has a feminine energy and rules both Taurus and Libra .
Heath :Venus rules over eyes, nose, chin, throat, sexual organs, kidneys, bladder etc. A badly placed Venus indicates dysfunction of these parts. Beauty is also strongly associated with Venus.

Jupiter

Jupiter is also well known as ‘Brahaspati’ or ‘Guru’. Jupiter is believed to rule both Moon and Sun and controls the movement of the planets. Jupiter signifies luck and fortune. The planet is responsible for success, fortune, luck and fame. Jupiter is an important planets for females (their married life and its success). People with high ambitions, priests, religious teachers, ministers, politicians are all influenced by Jupiter. People under the influence of Jupiter are jovial, lively and good tempered. However, the negative aspect of it is that person may be greedy and may act insecure at times Jupiter is the ruler of the fire sign Sagittarius. Jupiter is the largest planet in the solar system, it is associated with expansion, growth and opportunity. It represents the higher mind, wisdom, enthusiasm, optimism, benevolence and generosity. Jupiter's action is to expand, preserve and increase on all levels. The position of Jupiter in ones' chart serves as an indicator of one's faith, confidence and buoyancy. It shows the areas where one will find opportunity, growth and fulfillment. A well placed Jupiter is associated with the spiritual, philosophical and intellectual realms. An overstress on the function of Jupiter may lead to exaggeration, delusions of grandeur, and a depletion of energies through over-extension. A lack of Jupiter's influence could lead to pessimism, feelings of inadequacy, depression and lethargy.
Health :An ill disposed Jupiter leads to digestive disorders, gallstones, diabetes, low blood sugar, indigestion, gas, jaundice, hemorrhoids, obesity, malnutrition, hepatitis, obesity, weak digestion, blood sugar, and weight gain.

Mercury

Mercury is the son of Moon and Rohini and therefore called Saumya (son of Soma). It is a neutral planet and therefore, changes according to its placement in sign and house. Being nearest to Sun , mercury is restless and this makes is quick changing and fickle. It has adverse effects when conjuncts with Mars and make the person nervous and insecure. It rules education, writers, businessman, intestines, lungs and nervous system.This is a planet of logic and therefore, possessing a powerful Mercury indicates good reasoning ability and grasping power. Though both Jupiter and Mercury represent the human intelligence, Mercury indicates somewhat immature side of intelligence, compared to mature one of Jupiter. It is a dual natured planet and owns the dual natured signs, Virgo and Gemini . It rules all means of communication and intermediation. Mercury indicates various professions like mathematicians, astrologers and computer engineers(all are the areas demanding logics). Since it is a planet of scientific inquiry, all kinds of scientific researches are also governed by Mercury. Besides, it also indicates professions like brokership, dealerships etc. It rules means of communication, therefore telephone and telegraphs, e-mails, couries and post etc. are governed by Mercury.
Health :Mercury rules over the arms, ear hearing system, and the nervous syste

Mars

Personified as the God of war, Mars makes people under its influence short tempered, police man, soldiers, generals, and commanders. It influences energy, drive, administrative and leadership abilities, and independent spirit.If Sun is the king of the solar system, Mars is the commander. Mars indicates martial powers, martial arts and the military; rules over explosives and fire arms. A native borne in Aries is openly aggressive, while the one born in Scorpio tends to be secretive in nature. Both Sun and Mars produce heat but the one of the Sun is actually life preserving, but the excessive, explosive heat generated by Mars may actually endanger life. Mars is the strong for those working in police department, miners, defense services, explosive experts, people dealing in copper and gold, surgeons, fire arms manufacturing facilities, etc.
Health :Mars rules over the bone marrow and generation of red blood corpuscles, human blood, and the disease resistant power of human body.