November's main puzzle

The Unseen Planet

Five moons circle at steady speeds, but sometimes one takes an extra step. Something nobody can see is pulling them, moving at a steady pace of its own. Each day brings one more day of evidence. Find it. Not a test.

The rule: each day, every moon moves first. A moon within the planet's reach at the start of that day feels its pull. Then, on its days to move, the planet moves one sector.