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1. Oxford American Dictionary

   retrogradation

   • IPA[ˌretrōɡrāˈdāSH(ə)n]

   美式

   • n.
     the apparent temporary reverse motion of a planet (from east to west), resulting from the relative orbital progress of the earth and the planet.；the orbiting or rotation of a planet or planetary satellite in a reverse direction from that normal in the solar system.

   • noun: retrogradation

2. • 更多解釋

   retrogradation

   • IPA[ˌrɛtrəʊɡrəˈdeɪʃn]

   英式

   • n.
     the apparent temporary reverse motion of a planet (from east to west), resulting from the ...

   Oxford Dictionary