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. Aquarius is a fixed air sign ruled by Saturn, which is neutral to Ketu: the sign of groups, networks, causes and the future.
With Rahu in Leo, fame, spectacle and the single leader are what the world is reaching for. On the Ketu side, mass movements and shared ideals lose their pull. Groups split. Causes burn out. The lesson is that a cause needs people who keep it going after the crowd goes home.