Ghosts can move only in darkness, but they can move everywhere in that darkness. Whenever there's an eclipse, ghosts can, and will, travel freely between Earth and Moon, and sometimes hitch a ride on an asteroid
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also, many ghosts migrate with the seasons, with the right eyes you can spot them in the night sky as spectral clouds moving against the wind
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Replying to @whitequark
earth rotates as well, ghosts are used to this (really lazy ghosts will settle down in the polar night though)