Rahu is the Moon's north node, a shadow planet that stands for craving, novelty, the foreign and the drive to have more. It moves backward through the zodiac with Ketu opposite. In Sagittarius, a mutable fire sign ruled by Jupiter, which is neutral to Rahu, the craving is for belief, law, foreign ideas and the big answer.
With Ketu in Gemini, the local, the everyday and the small fact are what the world is releasing. The theme is ideological surge. Movements promise meaning. Laws are fought over as if they were faiths. The lesson is that a borrowed certainty is still borrowed, and that a teacher worth following is one who lets you check.