Ketu is the Moon's south node, a shadow planet with no body of its own. It stands for letting go, the past, sudden endings and the turn inward. It moves backward through the zodiac, and Rahu always sits in the opposite sign, reaching for what Ketu releases. Aries is a movable fire sign ruled by Mars, a friend to Ketu, so the planet is at ease here. Both are sharp and quick, and both cut.
With Rahu in Libra, partnership, alliance and fairness are what the world is reaching for. On the Ketu side, the lone fighter and the urge to win alone lose their hold. Conflicts end suddenly, or burn out. The lesson is that courage still counts when nobody is watching.