Rahu is in 3rd house in Sagittarius

As a Jyotish astrologer, I can say that Rahu in the 3rd house of Sagittarius sign can have various effects depending on the planetary positions and the individual's horoscope. However, some general effects could be predicted based on the planetary configuration.

Rahu represents the shadowy planet, which brings confusion and illusions to one's life. It is a malefic planet that creates obstacles in the path of an individual. The 3rd house mainly represents communication, courage, and siblings. Sagittarius is ruled by Jupiter, which signifies expansion and knowledge.

Having Rahu in the 3rd house implies that the individual may have communication-related difficulties, and they may feel lost at times. They may have a hard time communicating their thoughts openly with others or their siblings. The placement can also indicate that they may harbor a fear of taking risks, resulting in a lack of courage.

However, Rahu's placement in the Sagittarius sign signifies that the native's quest for knowledge and expansion may be heightened. They may become more interested in exploring new horizons and understanding new concepts. At the same time, they must ensure that they do not get lost in illusions or delusions brought by Rahu.

Overall, the placement of Rahu in the 3rd house of Sagittarius sign is a complex one and requires detailed analysis of the individual's birth chart to predict the exact effects.