Lunar calendar? How about the rotation of the earth? I imagine the further out it gets, the further out our moment of inertia, the slower the earth spins. Days

Lunar calendar? How about the rotation of the earth? I imagine the further out it gets, the further out our moment of inertia, the slower the earth spins. Days get longer, but the length of a year stays the same. That'll be a fun one. We would probably have day length deniers/365 purists who believe nothing is changing for centuries.