In Hindu mythology, Rahu is a cut-off head of an asura, that swallows the sun or the moon causing eclipses. He is depicted in art as a serpent with no body riding a chariot drawn by eight black horses. Rahu is one of the navagrahas (nine planets) in Vedic astrology. The Rahu kala (time of day under the influence of Rahu) is considered inauspicious.
According to legend, during the Samudra manthan, the asura Rahu drank some of the divine nectar. But before the nectar could pass his throat, Mohini (the female avatar of Vishnu) cut off his head. The head, however, remained immortal. It is believed that this immortal head occasionally swallows the sun or the moon, causing eclipses. Then, the sun or moon passes through the opening at the neck, ending the eclipse.
Rahu is a legendary master of deception who signifies cheaters, pleasure seekers, operators in foreign lands, drug dealers, poison dealers, insincere & immoral acts, etc. It is the significator of an irreligious person, an outcast, harsh speech, logical fallacy, falsehoods, uncleanliness, abdominal ulcers, bones, and transmigration. Rahu is instrumental in strengthening one's power and converting even an enemy into a friend.
In Vedic astrology Rahu is seen as an asura or demon who does his best to plunge any area of life he controls into chaos, mystery, and cruelty. He is associated with the world of material manifestation and worldly desire, as well as random, uncontrolled growth without wisdom or understanding.Rahu can be considered the expert among the planets when it comes to scheming and plotting. It is the master of manipulation.
Rahu is friends with Ketu, Saturn, Mercury and Venus. It is the enemy of Sun, Moon, Mars, and Jupiter. It is important to note that Rahu is more inimical to the Sun as compared to the Moon.Rahu is lord of three nakshatras or lunar mansions: Ardra, Svati and Shatabhisha. Rahu is associated with the following: its color is smoky, metal is lead, and its gemstone is honey-colored hessonite. Its element is air and its direction is southwest.