The North Node of chandra (Moon) is called Rahu in Hindu astrology. Rahu is not a material embodiment and is referred to as chaya graha (Shadow planet). Rahu is the northern point where the path of earth around sun cuts the path of chandra. When moon, sun and earth come in the same plane near to rahu the eclipses are caused. Rahu is a malefic and afflicts the planet he is associated with. He is the significator of any sudden event be in an accident or a lottery gain. He indicates secrecy, dissatisfaction, hidden enemies, greed, proficiency in foreign and artificial languages like computer languages. He represents foreign or alien culture, obsessive personality, mass tragedies and mysterious diseases. He causes abortions, rifts in married life as well as domestic problems. In certain houses in the chart rahu is better for example, in the 6th house. Regular propitiation measures to rahu removes above problems. The possibility of accidents, snake bites, allergy etc., are reduced.
When Rahu (Dragon's Head) is malefic in the chart or horoscope, Rahu Yantra/ Dragon's Head Yantra is kept in the house or pocket to negate the malefic effects of the Planet. Rahu Yantra/ Dragon's Head Yantra bless the native with knowledge, deep understanding, and respect. Rahu Yantra/ Dragon's Head Yantra shall be installed on any rising Moon Saturday.If worshipped regularly it enables a person to control his enemies and defeat them if they try to harm him. It enhances the hidden capabilities in a person. It gives a boost in professional life and makes the person highly successful in rising above competition.
Mantra in English:
Stotra : Ardha-kayam mahim-viryam chandraditya-vimardanam simhika-garbha-sambhutam tam rahum pranamamy aham
When translated in English, it means:
"I offer my obeisances to Rahu, born from the womb of Simhika, who has only half a body yet possesses great power, being able to subdue the Sun and the Moon."