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1. Oxford American Dictionary

   mean solar day

   • IPA[mēn ˈsōlər dā]

   • n.
     the time between successive passages of the mean sun across the meridian.

   • noun: mean solar day, plural noun: mean solar days

2. • 更多解釋

   mean solar day

   • n.
     the time between successive passages of the mean sun across the meridian.

   Oxford Dictionary