Whilst I understand why stars move across our skies,(Earth rotation) I struggle to understand why they do not appear to move relative to each other.
To explain: Take the best know constellation the Plough. It is a familiar site to most people. But it has been there apparently un-changed for years. If we (I mean earth, moon, stars and everything else ) are hurtling through space, then surely changes should be apparent unless we are all travelling in the same direction at exactly the same speed.