In Hindu astrology, Rahu is one of the nine important planets (graha), but is an invisible or “astral” one, along with its counterpart, Ketu. Physically speaking, it is one of two points in the heavens where the moon crosses the ecliptic or path of the sun. The point where the moon crosses the ecliptic moving from south to north is Rahu, the north node. The south node is Ketu. Rahu and Ketu are depicted as a serpent demon who encircles the earth. Ketu is the dragon’s tail and Rahu is the head. Both are believed to cause general consternation among people.
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