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  1. Oxford American Dictionary

    proper motion

    • IPA[ˌpräpər ˈmōSH(ə)n]

    美式

    • n.
      the part of the apparent motion of a fixed star that is due to its actual movement in space relative to the sun.

    • noun: proper motion

    • 更多解釋

    proper motion

    • n.
      the part of the apparent motion of a fixed star that is due to its actual movement in space ...

    Oxford Dictionary