ぎゃっこううんどう 逆行運動 LinksSentence search for 逆行運動Sentence search for ぎゃっこううんどうKanji details for 逆, 行, 運 and 動Edit in JMdict Noun1. retrograde motionAstronomy, See also 順行運動Noun2. apparent retrograde motion; retrogradationAstronomy Discussions Log in to talk about this word.